Journal of Fluids Engineering最新文献_第4页

One-way FSI Simulation of the Added Damping of T(0,1) Modes of Two Partially Overlapped Identical Plates in Still Water 单向 FSI 模拟静水中两个部分重叠的相同平板的 T(0,1) 模的附加阻尼

Journal of Fluids Engineering Pub Date : 2024-03-22 DOI: 10.1115/1.4065151

Ming Zhang, Qing-guang Chen, Jun Li

{"title":"One-way FSI Simulation of the Added Damping of T(0,1) Modes of Two Partially Overlapped Identical Plates in Still Water","authors":"Ming Zhang, Qing-guang Chen, Jun Li","doi":"10.1115/1.4065151","DOIUrl":"https://doi.org/10.1115/1.4065151","url":null,"abstract":"\u0000 Structures with a partially overlapped status in water can be seen in some engineering applications, and the fluid-structure coupling vibration behavior of two partially overlapped identical plates has been studied previously through the experimental method. In this study, the added damping of the T(0,1) modes of two submerged partially overlapped plates is numerically investigated through the one-way fluid-structure interaction (FSI) method. The relevant numerical settings, like the mesh size, calculated periods, time step size, and vibration amplitude, were tested first. Then, the numerical results were compared with experimental results, and good agreements were found. Finally, numerical results were analyzed. The vibration status of two plates in the joint abutting area or the overlapped area has an important influence on the added mass variation. When the added mass is higher, the phase difference between modal force and vibration displacement is also greater, which is the main reason for the higher added damping. The relationship between the phase difference and the frequency in water can be approximately fitted to a straight line, which can probably be used to predict the added damping variations caused by fluid boundary changes of submerged structures.","PeriodicalId":504378,"journal":{"name":"Journal of Fluids Engineering","volume":" 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140387451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Flow Physics of a Rotating Bernoulli Pad: A Numerical Study 旋转伯努利垫的流动物理学：数值研究

Journal of Fluids Engineering Pub Date : 2024-03-22 DOI: 10.1115/1.4065148

Anshul S. Tomar, A. Hellum, Kristina M. Kamensky, Ranjan Mukherjee

引用次数: 0

Exploration of High-Frequency Actuation On Gust Response Using Large-Eddy Simulation 利用大型埃迪模拟探索高频致动对阵风响应的影响

Journal of Fluids Engineering Pub Date : 2024-03-22 DOI: 10.1115/1.4065149

Caleb Barnes

引用次数: 0

The Design and Optimization of Additively Manufactured Radial Compressor of a Miniature Gas Turbine Engine 微型燃气涡轮发动机增材制造径向压缩机的设计与优化

Journal of Fluids Engineering Pub Date : 2024-03-19 DOI: 10.1115/1.4065098

C. C. Ergin, T. Verstraete, B. Saracoglu

引用次数: 0

Time-Resolved Local Loss Analysis of Single- and Two-Blade Pump Flow 单叶片和双叶片泵流的时间分辨局部损耗分析

Journal of Fluids Engineering Pub Date : 2024-03-19 DOI: 10.1115/1.4065099

A. Pesch, R. Skoda

{"title":"Time-Resolved Local Loss Analysis of Single- and Two-Blade Pump Flow","authors":"A. Pesch, R. Skoda","doi":"10.1115/1.4065099","DOIUrl":"https://doi.org/10.1115/1.4065099","url":null,"abstract":"\u0000 A method for the evaluation of time-resolved entropy production in isothermal and incompressible flow is presented. It is applied as a post-processing of the three-dimensional flow field obtained by time-resolved computational fluid dynamics with scale adaptive turbulence modeling. Wall functions for direct and turbulent entropy production are presented for a cell-centered finite volume method, implemented in the open source software OpenFOAM and validated on channel, asymmetric diffuser and periodic hill flow. Single- and two-blade centrifugal pump flow is considered for a wide range of load conditions. Results are compared to experimental data. Time-averaged analysis shows essentially the same loss density distribution among pump components for both pumps, with the impeller and volute region contributing the most, especially in off-design conditions. For both pumps, the losses exhibit significant fluctuations due to impeller-volute interactions. The fluctuation magnitude of loss density is in the same range as flow rate fluctuations and much smaller than pressure fluctuation magnitude. For the two-blade pump, loss fluctuation magnitude is smaller than for the single-blade pump. Distinct loss mechanisms are identified for different load conditions. Upon blade passage, a promoted or attenuated volute tongue separation is imposed at part or overload, respectively. In between blade passages, a direct connection from pump inlet to the discharge leads to enhanced flow rate and loss density fluctuations. Future work aims at extending this analysis to stronger off-design conditions in multi-blade pumps, where stochastic cycle fluctuations occur.","PeriodicalId":504378,"journal":{"name":"Journal of Fluids Engineering","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140229347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental and Numerical Study of Hydraulic Characteristics and Pressurization Deterioration Mechanism of a Three-Stage Mixed-Flow Electrical Submersible Pump Under Gas-Liquid Condition 气液条件下三级混流式电潜泵水力特性和增压劣化机理的实验与数值研究

Journal of Fluids Engineering Pub Date : 2024-03-16 DOI: 10.1115/1.4065100

Xiaoyu Dai, Qiang Xu, Chenyu Yang, Xiaobin Su, Liang Chang, Liejin Guo

{"title":"Experimental and Numerical Study of Hydraulic Characteristics and Pressurization Deterioration Mechanism of a Three-Stage Mixed-Flow Electrical Submersible Pump Under Gas-Liquid Condition","authors":"Xiaoyu Dai, Qiang Xu, Chenyu Yang, Xiaobin Su, Liang Chang, Liejin Guo","doi":"10.1115/1.4065100","DOIUrl":"https://doi.org/10.1115/1.4065100","url":null,"abstract":"\u0000 Electrical submersible pump (ESP) is extensively utilized in industrial sectors such as petroleum, chemical, and nuclear energy. However, ESPs will experience pressurization deterioration due to the high gas volume fraction (GVF), resulting in the pressurization failure. In this paper, a three-stage mixed-flow ESP with closed impeller structure is designed and developed. The interstage hydraulic characteristics and pressurization deterioration mechanism of the mixed-flow ESP are investigated at various rotational speeds and inlet conditions by combining experimental and simulation. The Population Balance Model (PBM) and RNG k-e model are employed. As the liquid flow rate increases, the ESP experiences a ‘three-stage’ downward trend in pressurization. It is discovered that the first booster stage has a lower inflow velocity and flow separation degree compared to the subsequent booster stages, resulting in a greater liquid-phase pressurization capacity. The gas-liquid pressurization exhibits a wave-shaped downward trend due to significant deterioration in stage-wise pressurization when the liquid flow rate is low. Once the Inlet Gas Volume Fraction (IGVF) reaches the first critical GVF, the gas aggregates on the impeller's suction surface is removed at the impeller outlet, creating an annular air mass which creating a chaotic vortex absorbing the fluids’ kinetic energy. As a result, the first booster stage experiences a significant reduction in its pressurization ability, causing an abrupt decrease in the pressurization curve.","PeriodicalId":504378,"journal":{"name":"Journal of Fluids Engineering","volume":"73 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140237123","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical Analysis of The Drag Reduction Performance of a Double M-Ship Boat With Stepped Planing-Air Coupling 采用阶梯式平气耦合的双 M 型船的减阻性能数值分析

Journal of Fluids Engineering Pub Date : 2024-03-16 DOI: 10.1115/1.4065097

Yu Ya, Ziji Zhang, Shuai Wang, Shujiang Li

{"title":"Numerical Analysis of The Drag Reduction Performance of a Double M-Ship Boat With Stepped Planing-Air Coupling","authors":"Yu Ya, Ziji Zhang, Shuai Wang, Shujiang Li","doi":"10.1115/1.4065097","DOIUrl":"https://doi.org/10.1115/1.4065097","url":null,"abstract":"\u0000 In this paper, analyze the influence of the stepped planing structure on the drag performance by observing waveform diagrams at the stern of the double M-ship and water-air and pressure distribution diagrams at the bottom of the ship. This study the combined stepped planing-air drag reduction technology to improve the sailing characteristics of the double M-ship. Research findings: The stepped planing contributes to a reduction in bottom pressure, enhances water-air distribution, and augments the amplitude of hull movement. Within the design speed range, the maximum drag reduction rate achieved by the stepped planing is 7.574%. However, this enhancement comes at the expense of increased viscous pressure resistance, which becomes the predominant resistance when sailing at full speed; Injecting air at the stepped planing can effectively reduce the viscous pressure resistance increased by the stepped planing. The combined drag reduction technology of stepped planing and air successfully realizes the total drag reduction at the double-M ship's high speed. The total resistance experienced when air is injected at the stepped planing is reduced by up to 20.981% compared to the original hull.","PeriodicalId":504378,"journal":{"name":"Journal of Fluids Engineering","volume":"124 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140235680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Actuation Modeling of a Microfluidically Reconfigurable Radiofrequency Device 微流体可重构射频设备的激励建模

Journal of Fluids Engineering Pub Date : 2024-03-12 DOI: 10.1115/1.4065046

Behzad Parsi, Jason B Metten, Clinton Waite, Daniel Maynes, Nathan B. Crane

{"title":"Actuation Modeling of a Microfluidically Reconfigurable Radiofrequency Device","authors":"Behzad Parsi, Jason B Metten, Clinton Waite, Daniel Maynes, Nathan B. Crane","doi":"10.1115/1.4065046","DOIUrl":"https://doi.org/10.1115/1.4065046","url":null,"abstract":"\u0000 Microfluidic-based techniques have been shown to address limitations of reconfigurable radio frequency (RF) antennas and filters in efficiency, power handling capability, cost, and frequency tuning. However, the current devices suffer from significant integration challenges associated with packaging, actuation, and control. Recent advances in reconfigurable microfluidics that utilize the motion of a selectively metalized plate (SMP) for RF tuning have demonstrated promising RF capabilities but have exposed a need for an accurate fluid actuation model. This research presents a model for the mechanical motion of a moving plate in a channel to relate the SMP size, microfluidic channel size, velocity, and inlet pressure. This model facilitates understanding of the actuation response of an RF tuning system based on a moving plate independent of the actuation method. This model is validated using a millimeter-scale plate driven by a gravitational pressure head as a quasi-static pressure source. Measurements of the prototyped device show excellent agreement with the analytical model; thus, the designer can utilize the presented model for designing and optimizing a microfluidic-based reconfigurable RF device and selecting actuation methods to meet desired outcomes. To examine model accuracy at device scale, recent papers in the microfluidics reconfigurable RF area have been studied, and excellent agreement between our proposed model and the literature data is observed.","PeriodicalId":504378,"journal":{"name":"Journal of Fluids Engineering","volume":"152 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140249658","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Reduction of Disk Friction Loss by Applying a Fin to the Back of a Centrifugal Impeller 通过在离心叶轮背面安装鳍片减少盘摩擦损失

Journal of Fluids Engineering Pub Date : 2024-03-12 DOI: 10.1115/1.4065047

Satoshi Maeda, Takeshi Sano, Kazuyoshi Miyagawa, Kento Sakai

{"title":"Reduction of Disk Friction Loss by Applying a Fin to the Back of a Centrifugal Impeller","authors":"Satoshi Maeda, Takeshi Sano, Kazuyoshi Miyagawa, Kento Sakai","doi":"10.1115/1.4065047","DOIUrl":"https://doi.org/10.1115/1.4065047","url":null,"abstract":"\u0000 It is well known that the ratio of disk friction loss of low specific speed pumps is large. When the specific speed is 100min-1, m3/min, m or less, the disk friction loss increases remarkably. In this study, focusing on the clearance flow from the diffuser outlet to the impeller outlet (This is called the outward flow) behind the centrifugal pump, a fin was installed on outer diameter side of the rotating wall on the back side of a centrifugal pump as a countermeasure, and the influence of changes in velocity distribution near the wall on disk friction loss was investigated by torque measurements, velocity measurement, and CFD analysis. As a result, it was clarified that disk friction loss is decreasing by installing the fin in both torque measurements and CFD results, because the clearance flow is separated by fin and circumferential velocity is increased in the wake region of the fin in both measurements and CFD. In addition, it was clarified that disk friction coefficient (normalized torque) can be expressed as a function of the inlet swirl ratio and Reynolds number. Also, prediction equation is derived for each shape (with and without fin). According to the equation, it was found that disk friction loss reduction effect by installing a fin becomes larger when Reynolds number and the inlet swirl ratio are small.","PeriodicalId":504378,"journal":{"name":"Journal of Fluids Engineering","volume":"114 18","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140250818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Inflow Conditions and the Flow Behavior of Submerged Annular Viscoplastic Non-newtonian Jets 水下环形粘塑性非牛顿射流的流入条件和流动行为

Journal of Fluids Engineering Pub Date : 2024-03-12 DOI: 10.1115/1.4065052

K. Hammad

引用次数: 0