International Journal of Fluid Machinery and Systems最新文献_第4页

Numerical Analysis of Leakage Performance of Brush Seal Based on a 2-D Tube Bank Model and Porous Medium Model Considering the Effect of Compressible Gas 基于二维管库模型和考虑可压缩气体影响的多孔介质模型的刷式密封泄漏性能数值分析

International Journal of Fluid Machinery and Systems Pub Date : 2022-09-30 DOI: 10.5293/ijfms.2022.15.3.329

X. Song, M. Liu, Jing-Yea Yang

引用次数: 1

Comparison of Numerical Simulation and Experiment of Designed Vortex-Type Micro-hydro Water Turbine 涡型微型水轮机设计的数值模拟与实验比较

International Journal of Fluid Machinery and Systems Pub Date : 2022-09-30 DOI: 10.5293/ijfms.2022.15.3.297

E. Amalia, Hendarko Hendarko, M. N. Hamzah, Faridl A Maulana, F. H. Budisatrio, Muhammad Rafie, M. A. Moelyadi

引用次数: 0

Research on State Trend Prediction of Hydraulic Turbine Units Based on Mult-dimensional and Multi-condition Data 基于多维多工况数据的水轮机机组状态趋势预测研究

International Journal of Fluid Machinery and Systems Pub Date : 2022-06-30 DOI: 10.5293/ijfms.2022.15.2.210

Xiaoping Jiang, Xiang Gao, C. Shi

{"title":"Research on State Trend Prediction of Hydraulic Turbine Units Based on Mult-dimensional and Multi-condition Data","authors":"Xiaoping Jiang, Xiang Gao, C. Shi","doi":"10.5293/ijfms.2022.15.2.210","DOIUrl":"https://doi.org/10.5293/ijfms.2022.15.2.210","url":null,"abstract":"Aiming at the problem that it is difficult to accurately predict the flexible operation conditions and state trend of hydraulic turbine, in this paper a cascade model of BP-LSTM classification prediction is proposed, which can identify the working conditions of existing fusion data, and then predict the measuring points of different working conditions. Based on the pressure parameters of hydraulic turbine units, the improved BP neural network is used to determine the operation conditions of hydraulic turbine units, and the classified data is redivided to establish the multivariate LSTM prediction model. By optimizing the parameters of the multivariate LSTM prediction model, such as the structure, the number of network layers and the number of hidden layer neurons, finally established the cascade model of BP-LSTM classification prediction of time series of hydraulic turbine units. Through experimental verification and analysis, BP-LSTM classification prediction model can predict the operation trend of measuring points under different working conditions after classification. Compared with other models, BP-LSTM model has higher prediction accuracy and better effect. The cascade model of BP-LSTM classification prediction of time series provides a model basis for the research of predictive control of hydraulic turbine units.","PeriodicalId":38576,"journal":{"name":"International Journal of Fluid Machinery and Systems","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42568872","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: 1

Heat Transfer Performance Optimization of Rectangular Channel with Truncated-root Ribs 截根肋矩形通道传热性能优化

International Journal of Fluid Machinery and Systems Pub Date : 2022-06-30 DOI: 10.5293/ijfms.2022.15.2.272

K. Pham, V. Le, C. Dinh

引用次数: 0

A Novel Guide Vane System Design to Mitigate Rotating Vortex Rope in High Head Francis Model Turbine 降低高水头混流式水轮机旋转涡绳的新型导叶系统设计

International Journal of Fluid Machinery and Systems Pub Date : 2022-06-30 DOI: 10.5293/ijfms.2022.15.2.188

J. Joy, M. Raisee, M. Cervantes

引用次数: 4

Surface-set Diamond Bit Design for Deep-Sea Operating Environment of Seafloor Drill and Hole-Bottom Flow Field Analysis 面向深海海底钻井作业环境的地面镶钻钻头设计与井底流场分析

International Journal of Fluid Machinery and Systems Pub Date : 2022-06-30 DOI: 10.5293/ijfms.2022.15.2.158

Jialiang Wang, Dilei Qian, Yang Sun, Fenf Peng

{"title":"Surface-set Diamond Bit Design for Deep-Sea Operating Environment of Seafloor Drill and Hole-Bottom Flow Field Analysis","authors":"Jialiang Wang, Dilei Qian, Yang Sun, Fenf Peng","doi":"10.5293/ijfms.2022.15.2.158","DOIUrl":"https://doi.org/10.5293/ijfms.2022.15.2.158","url":null,"abstract":"Drilling sampling technology is an important means for obtaining underground physical data and evaluating mineral reserves. The coring diamond bit is located in the front of the drilling equipment, which can reflect the drilling efficiency and core recovery of the bit when drilling into the coring. In order to improve the drilling efficiency and core recovery, a design scheme of diamond bit for seafloor drills is proposed, which combines the formation characteristics of the seafloor within 300 meters. Based on the fluid dynamics theory and considering the effect of bit rotation on the flow field at the hole-bottom, the effects of bit water passage structure and drilling parameters on the flow field are analyzed. The results show that the designed bit can avoid the core erosion by 80% of the drilling fluid. The rotary speed should be controlled at 250 - 330 rpm, and the pump displacement should be 50 - 60 L/min. When the drilling fluid is up-return along the hole wall, the velocity first rises and then drops, then stabilizes between 0.8 - 1.3 m/s, which meets the range requirements for the standard cuttings up-return and the stability of the hole wall. Finally, the rationality of the bit design scheme is verified by field drilling experiments. The average core recovery percent reaches 85 %, which is about 25% higher than the conventional bit of water passage","PeriodicalId":38576,"journal":{"name":"International Journal of Fluid Machinery and Systems","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43034379","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

Research on Common Fault Diagnosis and Classification Method of Centrifugal Pump Based on ReliefF and SVM 基于ReliefF和SVM的离心泵常见故障诊断与分类方法研究

International Journal of Fluid Machinery and Systems Pub Date : 2022-06-30 DOI: 10.5293/ijfms.2022.15.2.287

Xingxin Xiao, Hui Chen, L. Dong, Hou-lin Liu, Chuanhan Fan

{"title":"Research on Common Fault Diagnosis and Classification Method of Centrifugal Pump Based on ReliefF and SVM","authors":"Xingxin Xiao, Hui Chen, L. Dong, Hou-lin Liu, Chuanhan Fan","doi":"10.5293/ijfms.2022.15.2.287","DOIUrl":"https://doi.org/10.5293/ijfms.2022.15.2.287","url":null,"abstract":"The centrifugal pump is an important rotating machine and it is very critical to identify and differentiate among its common faults as quickly and accurately as possible. Based on the ReliefF algorithm and the sparrow search algorithm (SSA) in conjunction with support vector machine (SVM), an approach for faults classification and diagnosis of centrifugal pumps is proposed, its advantages over traditional fault diagnosis methods include a reduction in the number of characteristic parameters, shorter diagnosis times, as well as improved classification accuracy and robustness. We collected the fault data by designing a centrifugal pump fault test bench that recorded vibration signals for the rotor misalignment fault, the rotor unbalance fault, the seal ring wear fault, and normal operating conditions, and preprocessed the collected signals with Kalman filtering to remove noise interference, the time domain characteristic indexes and the frequency domain characteristic indexes of the filtered signal were extracted, each feature index is given a distinct weight using the ReliefF method, and the eigenvalues with weights less than the threshold are deleted, and the feature indexes that remain create a defect feature matrix. Particle swarm optimization (PSO), genetic algorithm (GA), and simulated annealing algorithm (SA) were used to optimize the SVM for comparison in order to verify the SSA-SVM model's performance for fault diagnosis. The comparison results show that the model has high recognition accuracy, short Classification time, and strong robustness.","PeriodicalId":38576,"journal":{"name":"International Journal of Fluid Machinery and Systems","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43575854","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

Analysis of coasting-down hydrodynamic characteristics of sodium pump in the primary circuit of fast reactor 快堆一次回路钠泵滑行水动力特性分析

International Journal of Fluid Machinery and Systems Pub Date : 2022-06-30 DOI: 10.5293/ijfms.2022.15.2.235

Yang Congxin, L. Xin, Qian-peng Chen

{"title":"Analysis of coasting-down hydrodynamic characteristics of sodium pump in the primary circuit of fast reactor","authors":"Yang Congxin, L. Xin, Qian-peng Chen","doi":"10.5293/ijfms.2022.15.2.235","DOIUrl":"https://doi.org/10.5293/ijfms.2022.15.2.235","url":null,"abstract":"The variation of coasting-down hydrodynamic characteristics of the sodium pump in the primary circuit of fast reactor is related to the safe and stable operation of nuclear power plant. In order to explore the variation rule of performance parameters during the coasting-down process, the prototype of the sodium pump (Vertical double suction coaxial in and out submersible pump) in the primary circuit of fast reactor was taken as the research object in this paper. Based on the N-S equation and the RNG k - ε turbulence model, the Fluent software was used. The UDF function was written to carry out unsteady numerical calculation on the coasting-down process of sodium pump, and the variation rule of rotating speed, flow rate, head, torque and pressure with time in the coasting-down process was obtained. The results show that during the coasting-down process ， the time for the model pump rotating speed to drop to half (296.5 r/min) is more than 15 s, and the time to drop to the minimum (112 r/min) is more than 74 s, which meets the nuclear safety standards. The flow rate ratio and the rotating speed ratio have the same change law, the head ratio and the torque ratio have the same change law, and the decline speed of the head ratio and torque ratio is greater than the rotating speed ratio and the flow rate ratio, which conforms to the similarity law of the pump. During the coasting-down process, the energy of the model pump pressure pulsation is mainly concentrated at middle and low frequencies. With the increase of the coasting-down time, the amplitude of pressure pulsation decreases gradually, and the uniformity of pressure distribution at circumferential direction decreases gradually. In addition, under the influence of pressure pulsation and the complexity of flow passage of the flow components, the head has a pulsating downward trend.","PeriodicalId":38576,"journal":{"name":"International Journal of Fluid Machinery and Systems","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49179587","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 Structure and Slipstream Characteristics of an Axial Flow Hydraulic Turbine with a Collection Device in an Open Channel 明渠带收集装置的轴流式水轮机的流动结构和滑流特性

International Journal of Fluid Machinery and Systems Pub Date : 2022-06-30 DOI: 10.5293/ijfms.2022.15.2.256

Y. Nishi, Hiroto Sasashita, T. Inagaki

{"title":"Flow Structure and Slipstream Characteristics of an Axial Flow Hydraulic Turbine with a Collection Device in an Open Channel","authors":"Y. Nishi, Hiroto Sasashita, T. Inagaki","doi":"10.5293/ijfms.2022.15.2.256","DOIUrl":"https://doi.org/10.5293/ijfms.2022.15.2.256","url":null,"abstract":"The axial flow hydraulic turbine with a collection device can be simply installed in the flowing water of an open channel with shallow water depth to generate electricity, and the power output is increased by collecting and increasing the velocity of the flow. When the power output of this hydraulic turbine is insufficient, it is necessary to install several turbines in series with the flow in narrow channels, and it is necessary to establish a guideline for appropriate installation intervals. In this study, the relationship between the velocity distribution and the vortex structure inside and outside the hydraulic turbine was investigated by experiments and multiphase flow analysis considering free surface in order to clarify the slipstream characteristics of this hydraulic turbine in an open channel with shallow water depth. As a result, it was clarified that the axial flow velocity behind the brim recovered rapidly due to the momentum exchange between the flow passing through the outside of the hydraulic turbine and the flow passing through the inside of the hydraulic turbine. It was also discovered that all the major vortices disappeared at a position 9 times the runner diameter in the downstream direction from the runner center, and more than 70% of the axial flow velocity was recovered in the entire width direction.","PeriodicalId":38576,"journal":{"name":"International Journal of Fluid Machinery and Systems","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44164521","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: 1

Redesign and Implementation of Big Fan Impellers for Enhancing Its Efficiency 大风扇叶轮的重新设计与实现以提高其效率

International Journal of Fluid Machinery and Systems Pub Date : 2022-06-30 DOI: 10.5293/ijfms.2022.15.2.246

P. Darmanto, Arief Syahlan, Michael Ariefyanto Wibowo

引用次数: 0