International Journal of Fluid Machinery and Systems最新文献_第8页

Compressor Surge Frequencies Modeled by the Concept of Emptying and Filling Actions 压缩机喘振频率的排空和充注动作概念模型

International Journal of Fluid Machinery and Systems Pub Date : 2021-06-30 DOI: 10.5293/ijfms.2021.14.2.183

N. Yamaguchi

引用次数: 2

Design and Mathematical Modelling of Pressurisation System for Inflatable Aerodynamic Decelerator 充气式气动减速器增压系统设计与数学建模

International Journal of Fluid Machinery and Systems Pub Date : 2021-06-30 DOI: 10.5293/ijfms.2021.14.2.161

Chandani Saxena, L. Prakash, S. Unnikrishnan, S Nikesh, V Dilip, M. Radhakrishnan

引用次数: 0

Prediction of Cavitation Surge Onset Point by One-Dimensional Stability Analysis 用一维稳定性分析预测空化浪涌起爆点

International Journal of Fluid Machinery and Systems Pub Date : 2021-06-30 DOI: 10.5293/ijfms.2021.14.2.199

S. Watanabe, Y. Tsujimoto

引用次数: 0

Fiber-Concentration Distributions of Papermaking Pulp Suspension Flowing in a Channel with a Sudden Expansion 造纸纸浆悬浮液在突然膨胀通道中流动的纤维浓度分布

International Journal of Fluid Machinery and Systems Pub Date : 2021-06-30 DOI: 10.5293/IJFMS.2021.14.2.150

M. Sumida, Tomoyuki Sedokubo

引用次数: 0

Optimal Structure Design and Performance Analysis of Multiphase Twin-screw Pump for Wet Gas Compression 湿气压缩多相双螺杆泵结构优化设计及性能分析

International Journal of Fluid Machinery and Systems Pub Date : 2021-06-30 DOI: 10.5293/ijfms.2021.14.2.208

Xuejing Zhang, Junhu Yang, Wenkai Bei, W. Han, Canyang Chen, Le Yang

引用次数: 4

Study on the Reinforcement Mechanism of Graphene Oxide for Non-asbestos Gasket Composites 氧化石墨烯增强非石棉垫片复合材料的机理研究

International Journal of Fluid Machinery and Systems Pub Date : 2021-03-31 DOI: 10.5293/IJFMS.2021.14.1.052

Li Yuxian, Liu Meihong, Gu Wenjuan, W. Juan, Su Junfeng

引用次数: 1

Reduced Numerical Modeling of a High Head Francis Turbine Draft Tube at Part Load 高水头混流式水轮机尾水管部分负荷简化数值模拟

International Journal of Fluid Machinery and Systems Pub Date : 2021-03-31 DOI: 10.5293/IJFMS.2021.14.1.095

J. Joy, M. Cervantes, M. Raisee

{"title":"Reduced Numerical Modeling of a High Head Francis Turbine Draft Tube at Part Load","authors":"J. Joy, M. Cervantes, M. Raisee","doi":"10.5293/IJFMS.2021.14.1.095","DOIUrl":"https://doi.org/10.5293/IJFMS.2021.14.1.095","url":null,"abstract":"In the present study, a reduced model of the Francis-99 model turbine was investigated numerically at part load operating condition. The reduced model consists of a standalone draft tube domain of the Francis-99 model turbine. Numerical studies performed in the past on nearly complete hydro-turbine models (inclusive of the spiral casing, distributor domains, runner, and draft tube) reportedly consist of a large number of computational grids. This may increase the computational costs and data storage required to perform numerical analysis, which could be a setback for future research on new design concepts and optimization study of the draft tube domain. The reduced model was developed by mapping the phase averaged axial, radial, and tangential velocity profiles from the runner exit to the inlet of the standalone draft tube domain. Additionally, turbulent kinetic energy (k) and turbulent eddy dissipation (ε) variables were also considered for better flow prediction inside the draft tube domain. Two methods for mapping inlet boundary conditions were considered in the present study. In the first method, the entire planar profile of the runner-draft tube interface was considered. In the second method, the variables along a radial profile at the runner exit were considered with an axissymmetric flow assumption over the entire draft tube inlet plane. The numerical results obtained from the Francis-99 reduced model turbine were validated against the numerical model of the NVKS Francis-99 model turbine (with available structured mesh) that was also analysed using the passage flow numerical technique and available experimental results. The results were found to be in reasonable agreement, with each other. The present study could be useful for the future mitigation study of rotating vortex rope by modifying the draft tube domain.","PeriodicalId":38576,"journal":{"name":"International Journal of Fluid Machinery and Systems","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46024068","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

Multi-Objective Optimization of Multistage Pump Balance Drum System Based on BP Neural Network and Genetic Algorithm 基于BP神经网络和遗传算法的多级泵平衡筒系统多目标优化

International Journal of Fluid Machinery and Systems Pub Date : 2021-03-31 DOI: 10.5293/IJFMS.2021.14.1.080

Qian-peng Chen, L. Xin, Ling Zuguang, Yang Congxin

{"title":"Multi-Objective Optimization of Multistage Pump Balance Drum System Based on BP Neural Network and Genetic Algorithm","authors":"Qian-peng Chen, L. Xin, Ling Zuguang, Yang Congxin","doi":"10.5293/IJFMS.2021.14.1.080","DOIUrl":"https://doi.org/10.5293/IJFMS.2021.14.1.080","url":null,"abstract":"The axial force balancing capacity of a balance drum is a key factor affecting the life of multi-stage centrifugal pumps. In this paper, a double shell segmental multistage pump is taken as the research object. The hydraulic performance and axial force performance are set as the optimization objectives, and the performance data are obtained by numerical simulation with FLUENT software. The BP neural network is used to establish the prediction model of structural parameters of the balance system, hydraulic performance and residual axial force performance, and it is used as the adaptive value evaluation model of genetic algorithm to solve the optimal value in the sample space. The results show that the radial clearance of the balance drum and the balance tube orifice flowmeter, the axial width of the balance cavity are the significant factors affecting the hydraulic performance and axial force performance of the multistage pump. When the radial clearance of the balance drum is 0.1mm, the clearance of the orifice flowmeter is 1.95mm, and the axial width of the balance cavity is 55mm, the multi-stage pump has the best hydraulic performance and the smallest residual axial force. The vortex band in the balance cavity can increase the amount of the fluid spin and enhance the axial force balancing capacity of the balance drum. The greater the area occupied by the negative high-rotation fluid in the balance cavity, the stronger the ability of the balance drum to balance the axial force. The test results show that compared with the prototype multistage pump, at nominal flow rate, the head and efficiency of the optimized model are increased by 0.71% and 1.63% respectively, and the bearing temperature and vibration speed of the multi-stage pump are significantly reduced.","PeriodicalId":38576,"journal":{"name":"International Journal of Fluid Machinery and Systems","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47879958","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: 2

Study of the Cavitation Phenomenon Inside Roller Vane Pump 滚柱叶片泵内部空化现象的研究

International Journal of Fluid Machinery and Systems Pub Date : 2021-03-31 DOI: 10.5293/IJFMS.2021.14.1.042

Bin Zhang, Zhao Chunxiao, Hong Haocen, Da-peng Bai, Huayong Yang

{"title":"Study of the Cavitation Phenomenon Inside Roller Vane Pump","authors":"Bin Zhang, Zhao Chunxiao, Hong Haocen, Da-peng Bai, Huayong Yang","doi":"10.5293/IJFMS.2021.14.1.042","DOIUrl":"https://doi.org/10.5293/IJFMS.2021.14.1.042","url":null,"abstract":"The roller vane pumps are widely used in the automobile industry as steering pumps. However, the cavitation damage near the outlet relief groove could directly decrease serve life and efficiency of the roller vane pump. In this paper, the mechanism of the cavitation is discussed, especially the cavitation damage near the tip of the relief groove. The computational fluid dynamics simulation method (CFD) based on dynamic meshing technique and user defined function (UDF) is applied to calculate flow dynamics and multi-phase flow characteristics, especially the flows inside the fluid film between the stator and valve plate. The simulated results show that the cavitation region is the same with the experiment one, and the cavitation inside the fluid film is caused by the shear action of the stator and valve plate. The negative pressure region near the relief groove has an extreme low pressure at 0.08 MPa, and the maximum flow velocity is 99.3 m/s. Besides, the cavitation region near the relief groove has the highest gas volume fraction of 2.23% and the lowest density of 560 kg/m3. Furthermore, the reason why cavitation happened at this position in a roller vane pump is analyzed by theoretical analysis.","PeriodicalId":38576,"journal":{"name":"International Journal of Fluid Machinery and Systems","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46146938","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

The Effect of Blades Gap on Propeller Openflume Picohydro Turbine Performance 叶片间隙对螺旋桨明渠小型水轮机性能的影响

International Journal of Fluid Machinery and Systems Pub Date : 2021-03-31 DOI: 10.5293/IJFMS.2021.14.1.122

Warjito, Budiarso, Muhammad Farhan Syahputra, Sanjaya B. S. Nasution

引用次数: 2