Fujian Huang , Yuejin Dai , Zhangying Hou , Yue Wang , Bang Wang , Ziqi Wang , Xinyu Chu , Diangui Huang
{"title":"Research on the optimization design of low-noise valve cores in steam turbine control valves based on parametric modeling and flow field analysis","authors":"Fujian Huang , Yuejin Dai , Zhangying Hou , Yue Wang , Bang Wang , Ziqi Wang , Xinyu Chu , Diangui Huang","doi":"10.1016/j.flowmeasinst.2025.103094","DOIUrl":"10.1016/j.flowmeasinst.2025.103094","url":null,"abstract":"<div><div>In small opening conditions, the control valves of power station steam turbines are prone to severe vibrations and aerodynamic noise due to the oscillation of supersonic jets, posing risks to equipment safety and personnel health. Addressing the limitations of existing optimization methods, such as high-pressure loss and limited applicability, this study proposes a low-noise valve core design method based on parametric profile optimization. A systematic comparison between the optimized valve core and the prototype valve was conducted in terms of structural performance. Numerical simulations were performed using a hybrid unstructured mesh model to verify the design and reveal the flow instability mechanisms under the critical separation pressure ratio. The optimization process focused on key profile parameters, including axial distance, radial distance, and deflection angle. The results indicate that the optimized valve core effectively reduces noise intensity by 26 % by extending the flow passage and deflecting the jet direction, while also lowering the critical separation pressure ratio by approximately 15 %. This study provides an optimization strategy for low-noise valve design under peak shaving conditions in power generation units, offering significant engineering application value.</div></div>","PeriodicalId":50440,"journal":{"name":"Flow Measurement and Instrumentation","volume":"107 ","pages":"Article 103094"},"PeriodicalIF":2.7,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145416845","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hangbo Li , Menghao Lin , Yang Liu , Yang Ding , Weiyi Chen , Tianle Wang , Jinda Lu , Xuezhi Li
{"title":"Investigation of flow field characteristics in triple-reflection ultrasonic anemometers based on numerical simulation and PIV experiments","authors":"Hangbo Li , Menghao Lin , Yang Liu , Yang Ding , Weiyi Chen , Tianle Wang , Jinda Lu , Xuezhi Li","doi":"10.1016/j.flowmeasinst.2025.103121","DOIUrl":"10.1016/j.flowmeasinst.2025.103121","url":null,"abstract":"<div><div>To address the issue of flow field interference in single-reflection ultrasonic anemometers under complex wind conditions, this study proposes a triple-reflection ultrasonic anemometry approach. A new anemometer model was developed by optimizing the transducer layout and support pillar arrangement. Numerical simulations and Particle Image Velocimetry (PIV) experiments were conducted to analyze key flow characteristics, including the velocity field, vorticity field, and turbulent kinetic energy. The results reveal distinct flow field features and superior measurement accuracy of the triple-reflection model. Compared to the single-reflection design, the proposed model exhibits significantly improved flow behavior across various wind speeds and directions. Within the transducer measurement section, streamlines are smoother, the extent of large-scale turbulent structures is reduced, and velocity vector consistency is enhanced in the main flow region. Furthermore, the strength and scale of wall-attached reverse vortices near the transducers are markedly diminished. The recirculation zone caused by flow separation is substantially smaller, and the vortex breakdown process shifts from large-scale intermittent separation to small-scale dissipation. In comparison, under complex wind conditions, the triple-reflection anemometer model exhibits improved consistency in ultrasonic measurement path velocity distribution. It achieves significant enhancement in measurement accuracy, with wind speed relative errors below 5 % and wind direction relative errors within ±6 %.</div></div>","PeriodicalId":50440,"journal":{"name":"Flow Measurement and Instrumentation","volume":"107 ","pages":"Article 103121"},"PeriodicalIF":2.7,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145579070","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Chuanjun Han , Guo Yuan , Qian Xu , Lingxia Ding , Qianlu Li , Mingjun Du
{"title":"Research on aerodynamic noise analysis and noise reduction method of gas regulator","authors":"Chuanjun Han , Guo Yuan , Qian Xu , Lingxia Ding , Qianlu Li , Mingjun Du","doi":"10.1016/j.flowmeasinst.2025.103128","DOIUrl":"10.1016/j.flowmeasinst.2025.103128","url":null,"abstract":"<div><div>To address the high noise levels observed in gas regulators installed in the manifolds of certain skid-mounted gas supply units, this study investigates a gas regulator with a diameter of 150 mm. A sound field analysis model is developed using the acoustic-fluid-solid coupling method, and its accuracy is validated through on-site sound pressure measurements. The mechanisms of noise generation induced by the regulator's internal flow field are further analyzed, and the effects of varying flow conditions on noise characteristics are systematically examined. Based on the identified noise generation mechanisms, two noise mitigation strategies are proposed, and the associated structural designs are optimized.The results indicate that the deviation between the simulated and measured sound pressure levels is less than 5 %, confirming the reliability of the numerical model. The noise level of the gas regulator increases progressively with flow rate. Installation of a noise-reduction orifice plate downstream of the gas regulator results in a 6.29 % reduction in sound pressure level. Optimization of the valve core and seat structure leads to a significant reduction in noise. The optimal noise reduction is achieved when the taper angle of the valve core and seat is set to 60°, resulting in a 6.7 % decrease in sound pressure level.</div></div>","PeriodicalId":50440,"journal":{"name":"Flow Measurement and Instrumentation","volume":"107 ","pages":"Article 103128"},"PeriodicalIF":2.7,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145579065","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Suna Guo , Qianhui Wang , Enbao Tian , Haojie Wang , Fan Wang
{"title":"Dynamic performance analysis of Coriolis mass flowmeter","authors":"Suna Guo , Qianhui Wang , Enbao Tian , Haojie Wang , Fan Wang","doi":"10.1016/j.flowmeasinst.2025.103072","DOIUrl":"10.1016/j.flowmeasinst.2025.103072","url":null,"abstract":"<div><div>The unsteady state in on-site actual operating conditions may affect the measurement accuracy and stability of the Coriolis mass flowmeters (CMF). To obtain the dynamic characteristics of the CMF, a DN25 CMF was taken as an example, and experiments and simulations were carried out. The results show that the stability time increases with the increase in step amplitude under step flow conditions. The stability time of negative step generation is greater than that of positive step generation. Under the conditions of pulsating flow, the higher the pulsation frequency, the more serious the attenuation of the obtained flow rate. Compared with the high flow rate, the signal attenuation caused by pulsation is larger when the flow rate is low. When the pulsation frequency is increased from 10 Hz to 50 Hz, the maximum attenuation is more than 22 %. Under the same conditions, the phase difference decreases with the increase in frequency. The mechanism of unsteady flow affecting the dynamic performance of CMF is revealed by qualitative analysis of velocity distribution and quantitative verification of the relative standard deviation and surface average velocity.</div></div>","PeriodicalId":50440,"journal":{"name":"Flow Measurement and Instrumentation","volume":"107 ","pages":"Article 103072"},"PeriodicalIF":2.7,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145106481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Prediction of air entrainment rate in venturi weirs","authors":"Parveen Sihag , Ahmet Baylar","doi":"10.1016/j.flowmeasinst.2025.103099","DOIUrl":"10.1016/j.flowmeasinst.2025.103099","url":null,"abstract":"<div><div>The Venturi effect is one of the most widely used methods of water aeration. Accurately predicting the air entrainment rate in Venturi weirs is essential for maintaining efficient aeration, ensuring optimal water quality, and supporting aquatic life. This study investigates the potential of Gradient Boosting Machine (GBM), Artificial Neural Network (ANN), Deep Neural Network (DNN), Distributed Random Forest (DRF), and Random Forest (RF) for predicting air entrainment rate (QA) in Venturi weirs. Experimental datasets of 60 samples were used, including key input variables: unit discharge (q), drop height (h), Venturi weir throat width (B), and free overflow jet expansion at the impact point (b<sub>j</sub>). The ANN model showed superior performance among the models considered, achieving the highest accuracy with training metrics of CC values of 0.9923, 0.9423, MAE values of 2.3929, 5.6610, RMSE values of 3.5823, 6.6332, RRMSE values of 16.8153, 24.3046, and NSE values of 0.9652, 0.8619 for the calibration and validation data sets, respectively. The Taylor diagram concluded that the ANN model performs the best, followed by the DNN model among all the models to estimate the air entrainment rate (QA) in Venturi weirs; the performance of the GBM model is found to be the worst among all the applied models. Sensitivity investigation results indicate that drop height was the most important variable in estimating the air entrainment rate (QA) in Venturi weirs.</div></div>","PeriodicalId":50440,"journal":{"name":"Flow Measurement and Instrumentation","volume":"107 ","pages":"Article 103099"},"PeriodicalIF":2.7,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145362658","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yavuz Selim Korkmaz , Ali Kibar , Kadri Süleyman Yi̇ği̇t , Zafer Doğruyol
{"title":"Experimental investigation and theoretical modeling of a dynamic function vehicle tire air control valve","authors":"Yavuz Selim Korkmaz , Ali Kibar , Kadri Süleyman Yi̇ği̇t , Zafer Doğruyol","doi":"10.1016/j.flowmeasinst.2025.103103","DOIUrl":"10.1016/j.flowmeasinst.2025.103103","url":null,"abstract":"<div><div>This study comprehensively investigates the pressure-time characteristics of a dynamic-function tire valve through both experimental and theoretical approaches. Systematic tests conducted on tanks with volumes ranging from 7.5 to 60 L were used to characterize the valve's performance during both filling and discharge processes. Based on the International Organization for Standardization (ISO) 6358 standard, an advanced theoretical model was developed. The main contribution of the study is the development and validation of a single coefficient that simplifies valve modelling by accounting for tank volume effects. Using exponential functions derived from extensive experimental data, a simplified yet highly accurate modelling methodology is proposed. This innovative approach replaces complex multi-parameter models with a single volume-dependent coefficient (<em>k</em>), significantly simplifying calculations while maintaining high accuracy and offering practical solutions for engineering applications. The experimental results align well with the theoretical model. During filling processes, it was observed that the model slightly overestimates the pressure at the initial stage, but overall provides reliable results. Additionally, it was found that the discharge coefficient and sonic conductance values decrease as the tank volume increases, indicating higher efficiency in systems with smaller tanks. The findings offer valuable insights for industrial applications such as Central Tire Inflation Systems (CTIS). Future research may explore the application of this approach to different valve types and systems, potentially contributing to the establishment of a new standard in pneumatic system modelling.</div></div>","PeriodicalId":50440,"journal":{"name":"Flow Measurement and Instrumentation","volume":"107 ","pages":"Article 103103"},"PeriodicalIF":2.7,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145362660","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"High subsonic performance of a diverterless supersonic inlet at various angles of attack: An experimental investigation","authors":"Rasoul Askari , Mahdi Abedi","doi":"10.1016/j.flowmeasinst.2025.103045","DOIUrl":"10.1016/j.flowmeasinst.2025.103045","url":null,"abstract":"<div><div>This study presents an experimental investigation into the high subsonic performance of a Y-shaped Diverterless Supersonic Inlet (DSI) integrated with an aircraft body. The evaluation of supersonic inlets at high subsonic speeds is critical, as a significant portion of supersonic aircraft flight time occurs during subsonic cruise conditions. To accurately capture the influence of fore-body geometry on the inlet's approaching flow, the experiments were conducted using a representative fore-body design featuring an elliptical nose. Tests were performed at a constant free-stream Mach number of <em>M</em><sub><em>∞</em></sub> = 0.75 and a zero-degree angle of sideslip (<em>AOS</em>), while the angle of attack (<em>AOA</em>) was varied from −2° to 6° in increments of 2°. The results demonstrate that the DSI exhibits consistent performance across the entire tested <em>AOA</em> range. Notably, while external static pressure variations exceeded 4 % of the free-stream static pressure due to <em>AOA</em> changes, the internal flow remained remarkably stable, with static and total pressure fluctuations at the Aerodynamic Interface Plane (AIP) staying below 0.7 %. Furthermore, the total pressure recovery (<em>TPR</em>) at the AIP showed minimal sensitivity to <em>AOA</em> variations, with deviations remaining below 0.75 %. These findings underscore the DSI's robustness and its potential for reliable operation under varying flight conditions.</div></div>","PeriodicalId":50440,"journal":{"name":"Flow Measurement and Instrumentation","volume":"107 ","pages":"Article 103045"},"PeriodicalIF":2.7,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145020208","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Performance of porous baffles under drag characteristics in a sway-excited sloshing tank with varying fill levels","authors":"Mallikarjun S. Bhandiwad , B M. Dodamani","doi":"10.1016/j.flowmeasinst.2025.103129","DOIUrl":"10.1016/j.flowmeasinst.2025.103129","url":null,"abstract":"<div><div>The vertical porous baffles, characterized by low porosity levels in partially filled tanks, have numerous engineering applications, particularly in situations where the fundamental resonant sloshing mode is most prominent. The presence of baffles with porosity introduces damping due to flow resistance. Accordingly, this study evaluates the hydrodynamic damping behavior of porous baffles in sloshing containment systems, focusing on their associated loss/drag coefficient characteristics. Within the computational framework, the performance of porous baffles is assessed considering both Reynolds number dependency and porosity effects (Model 1). Another work that considers baffle performance based solely on porosity (Model 2). The model's performance was compared with experimental shake table tests. During these experiments, the tank was subjected to sway motion across a range of excitation frequencies encompassing the first four resonant sloshing modes. In the test series, Model 1 consistently exhibits superior damping performance in wave attenuation compared to Model 2, with improvements ranging from 0.71 % to 0.97 %. The performance gap slightly widens as the fill depth increases, indicating that both Models maintain stable and robust attenuation across varying tank fill levels. Consequently, Model 1 exhibits higher damping and is more effective and reliable for applications where high attenuation is essential.</div></div>","PeriodicalId":50440,"journal":{"name":"Flow Measurement and Instrumentation","volume":"107 ","pages":"Article 103129"},"PeriodicalIF":2.7,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145579074","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Lintao Wang, Yili Yang, Xinkai Ding, Xiyuan Fan, Xin Liu
{"title":"Performance optimization of external gear flowmeters via passive rotation simulation (PRS) and experimental validation","authors":"Lintao Wang, Yili Yang, Xinkai Ding, Xiyuan Fan, Xin Liu","doi":"10.1016/j.flowmeasinst.2025.103126","DOIUrl":"10.1016/j.flowmeasinst.2025.103126","url":null,"abstract":"<div><div>External gear flowmeters (EGF) are high-precision positive displacement flow measurement devices with critical applications in precision flow control applications. However, existing simulation studies commonly employ active rotation modes with preset constant rotational speeds, which fail to accurately capture the true operational characteristics under fluid-driven conditions. This paper proposes a novel passive rotation simulation (PRS) method for gear flowmeters based on a degree of freedom (DOF) model, which accurately calculates gear rotational speed and pressure differential by solving gear motion equations driven by hydrodynamic torque, thereby achieving realistic simulation of EGF operation. Experimental validation demonstrates that the maximum relative errors between simulated and measured values for the meter coefficient and inlet-outlet pressure differential are 1.33 % and 4.82 %, respectively, confirming the method's accuracy. Based on the established simulation model, the influence mechanism of gear backlash on flowmeter performance was systematically investigated, revealing that micro-leakage flow produces pressure buffering effects, reducing pressure pulsation rates from 26.47 % to 7.11 %. Further investigation of relief groove structures demonstrates that small-spacing symmetric rectangular relief grooves can reduce pressure pulsation rates to 3.69 %, maintaining maximum measurement error within 0.28 % across 1–40 MPa pressure and 1–15 L/min flow ranges. This study reveals the key mechanism that measurement accuracy depends primarily on internal leakage consistency rather than its absolute magnitude, providing a theoretical foundation for high-precision gear flowmeter design optimization.</div></div>","PeriodicalId":50440,"journal":{"name":"Flow Measurement and Instrumentation","volume":"107 ","pages":"Article 103126"},"PeriodicalIF":2.7,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145528235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hongyan Lei , Muntadher Abed Hussein , Tarak Vora , Anupam Yadav , Asha Rajiv , Aman Shankhyan , Sachin Jaidka , Mehul Manu , Issa Mohammed Kadhim , Zainab Jamal Hamoodah , Fadhil Faez , Mehrdad Mottaghi
{"title":"Accurate machine-learning based modeling of apparent viscosity of waxy oils mixed with polymeric wax inhibitors","authors":"Hongyan Lei , Muntadher Abed Hussein , Tarak Vora , Anupam Yadav , Asha Rajiv , Aman Shankhyan , Sachin Jaidka , Mehul Manu , Issa Mohammed Kadhim , Zainab Jamal Hamoodah , Fadhil Faez , Mehrdad Mottaghi","doi":"10.1016/j.flowmeasinst.2025.102968","DOIUrl":"10.1016/j.flowmeasinst.2025.102968","url":null,"abstract":"<div><div>While producing and then transporting waxy oils through pipeline network systems, wax precipitation commonly leads to issues such as wax build-up, gel creation, and decreased flow, negatively affecting pipeline efficiency. To address these problems, the petroleum industry frequently uses polymeric flow improvers to enhance the rheological properties, thereby increasing the mobility and flowability of oils. Experimental methods to measure oil viscosity are both expensive and time-consuming; hence, having reliable data driven frameworks are necessary in this regard. This work presents the use of accurate artificial intelligence methods including K-nearest neighbors, convolutional neural network, multi-layer perceptron artificial neural network, decision tree, support vector machine, adaptive boosting, random forest and ensemble learning to create smart methods for calculating the apparent viscosity of waxy crude oils that are doped with polymeric additives by actual databank sourced from prior studies. A databank containing 526 datapoints was used to both prepare and validate these machine learning algorithms. The predicted results were then evaluated against actual lab data using both graphical and statistical methods. The outcomes showed a strong agreement between the determined and real values for the constructed models. These developed models offer a way of accurate estimation capability bypassing the need for costly, labor-intensive, and time-consuming experimental procedures.</div></div>","PeriodicalId":50440,"journal":{"name":"Flow Measurement and Instrumentation","volume":"107 ","pages":"Article 102968"},"PeriodicalIF":2.7,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145106477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}