International Journal of Rotating Machinery最新文献_第8页

Influence of Spiral Angle on the Performance of Spiral Oil Wedge Sleeve Bearing 螺旋角对螺旋油楔套轴承性能的影响

IF 0.9

International Journal of Rotating Machinery Pub Date : 2018-06-05 DOI: 10.1155/2018/5051794

Li-li Wang, Q. Zeng, Xin Zhang

引用次数: 0

Wall Pressure and Blade Surface Pressure in a Side Channel Blower 侧通道鼓风机的壁面压力和叶片表面压力

IF 0.9

International Journal of Rotating Machinery Pub Date : 2018-06-03 DOI: 10.1155/2018/2308759

Sven Münsterjohann, S. Becker

{"title":"Wall Pressure and Blade Surface Pressure in a Side Channel Blower","authors":"Sven Münsterjohann, S. Becker","doi":"10.1155/2018/2308759","DOIUrl":"https://doi.org/10.1155/2018/2308759","url":null,"abstract":"In side channel blowers, the pressure field is the result of complex, inner flow mechanisms. While there are already experimental investigations on the wall pressure distributions, little is known about the pressure in the rotating system, i.e., on the blade surface. In this work, we present an experimental setup for measuring the unsteady blade surface pressure in several positions. The acquired data will be complemented by and compared to the additionally measured wall pressure on the side channel housing. Miniature pressure sensors are integrated into the impeller. It is modified to ensure flush mounted membranes of the sensors and to avoid impacting on the flow field. A telemetric system is used for a wireless transfer of the data from the rotating system to the data recorder. As a result, we show the time-resolved pressure distribution as well as its phase-locked ensemble average. The variations of the pressure field are related to the integral pressure difference across the turbomachine and to its rotational speed. Due to the high temporal resolution of the measurement data, an exact spatial localization of crucial flow phenomena is achieved. Low integral pressure differences show a nearly linear increase of the pressure in circumferential direction, while greater integral pressure differences evolve exponentially over the azimuth. The results confirm the circulatory flow theory. Different rotational speeds elicit a comparable behavior. The stripper is a dominant source for pressure fluctuations. Its individual geometric discontinuities are correlated to the flow field. Our results provide a deeper understanding of the flow phenomena in side channel blowers and the theory of pressure generation. Although the measurements were performed for only one type of side channel blower with a double-flow configuration and open blades, the energy transfer mechanism is the same for other modifications like single flow or closed blade versions.","PeriodicalId":46335,"journal":{"name":"International Journal of Rotating Machinery","volume":"1 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2018-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2018/2308759","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43256682","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

Assessment of Steady and Unsteady Full Annulus Simulations Predictivity for a Low-Speed Axial Fan at Load-Controlled Windmill 负荷控制风车低速轴流风机定常与非定常全环空模拟预测评估

IF 0.9

International Journal of Rotating Machinery Pub Date : 2018-05-17 DOI: 10.1155/2018/7572631

A. Ortolan, Suk-kee Courty-Audren, Nicolas Binder, X. Carbonneau, Yannick Bousquet, F. Challas

{"title":"Assessment of Steady and Unsteady Full Annulus Simulations Predictivity for a Low-Speed Axial Fan at Load-Controlled Windmill","authors":"A. Ortolan, Suk-kee Courty-Audren, Nicolas Binder, X. Carbonneau, Yannick Bousquet, F. Challas","doi":"10.1155/2018/7572631","DOIUrl":"https://doi.org/10.1155/2018/7572631","url":null,"abstract":"A steady mixing plane approach is compared with the time-averaged solution of an unsteady full annulus calculation for a conventional fan operating at load-controlled windmill. The objective is to assess the added value of a complete unsteady calculation compared with a more classical approach, especially concerning the effect of the spatial and temporal periodicity release in such an unusual operation as windmill. Experiment with global steady measurements and rotor radial characterizations was conducted. Numerical analysis demonstrates that windmilling global performances obtained with the time-averaged solution of the unsteady simulation are not far different from the steady case, especially in the rotor. Some differences arise in the stator, particularly regarding the velocity field. Temporal periodicity release in this row has clearly a significant effect on the flow unsteady response. A detailed analysis highlights that generic patterns of windmilling flows recorded on a steady approach are also reported on the unsteady case.","PeriodicalId":46335,"journal":{"name":"International Journal of Rotating Machinery","volume":" ","pages":"1-12"},"PeriodicalIF":0.9,"publicationDate":"2018-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2018/7572631","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45936592","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

Research on Aerodynamic Characteristics of Straight-Bladed Vertical Axis Wind Turbine with S Series Airfoils S系列翼型直叶片垂直轴风力发电机气动特性研究

IF 0.9

International Journal of Rotating Machinery Pub Date : 2018-05-16 DOI: 10.1155/2018/8350243

F. Feng, Shouyang Zhao, Chunming Qu, Yuedi Bai, Yuliang Zhang, Yan Li

引用次数: 10

Design and Analysis of CFD Experiments for the Development of Bulk-Flow Model for Staggered Labyrinth Seal 交错迷宫式密封体积流动模型的CFD实验设计与分析

IF 0.9

International Journal of Rotating Machinery Pub Date : 2018-05-15 DOI: 10.1155/2018/9357249

Filippo Cangioli, P. Pennacchi, L. Nettis, L. Ciuchicchi

{"title":"Design and Analysis of CFD Experiments for the Development of Bulk-Flow Model for Staggered Labyrinth Seal","authors":"Filippo Cangioli, P. Pennacchi, L. Nettis, L. Ciuchicchi","doi":"10.1155/2018/9357249","DOIUrl":"https://doi.org/10.1155/2018/9357249","url":null,"abstract":"Nowadays, bulk-flow models are the most time-efficient approaches to estimate the rotor dynamic coefficients of labyrinth seals. Dealing with the one-control volume bulk-flow model developed by Iwatsubo and improved by Childs, the “leakage correlation” allows the leakage mass-flow rate to be estimated, which directly affects the calculation of the rotor dynamic coefficients. This paper aims at filling the lack of the numerical modelling for staggered labyrinth seals: a one-control volume bulk-flow model has been developed and, furthermore, a new leakage correlation has been defined using CFD analysis. Design and analysis of computer experiments have been performed to investigate the leakage mass-flow rate, static pressure, circumferential velocity, and temperature distribution along the seal cavities. Four design factors have been chosen, which are the geometry, pressure drop, inlet preswirl, and rotor peripheral speed. Finally, dynamic forces, estimated by the bulk-flow model, are compared with experimental measurements available in the literature.","PeriodicalId":46335,"journal":{"name":"International Journal of Rotating Machinery","volume":"2018 1","pages":"1-16"},"PeriodicalIF":0.9,"publicationDate":"2018-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2018/9357249","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44888038","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: 6

Fault Tolerant Control of Internal Faults in Wind Turbine: Case Study of Gearbox Efficiency Decrease 风力发电机内部故障的容错控制——以齿轮箱效率降低为例

IF 0.9

International Journal of Rotating Machinery Pub Date : 2018-04-30 DOI: 10.1155/2018/9538489

Younes Ait El Maati, L. Bahir, K. Faitah

引用次数: 3

Verification of Thermal Models of Internally Cooled Gas Turbine Blades 内冷燃气轮机叶片热模型的验证

IF 0.9

International Journal of Rotating Machinery Pub Date : 2018-04-23 DOI: 10.1155/2018/6780137

I. Shevchenko, N. Rogalev, A. Rogalev, A. Vegera, N. Bychkov

{"title":"Verification of Thermal Models of Internally Cooled Gas Turbine Blades","authors":"I. Shevchenko, N. Rogalev, A. Rogalev, A. Vegera, N. Bychkov","doi":"10.1155/2018/6780137","DOIUrl":"https://doi.org/10.1155/2018/6780137","url":null,"abstract":"Numerical simulation of temperature field of cooled turbine blades is a required element of gas turbine engine design process. The verification is usually performed on the basis of results of test of full-size blade prototype on a gas-dynamic test bench. A method of calorimetric measurement in a molten metal thermostat for verification of a thermal model of cooled blade is proposed in this paper. The method allows obtaining local values of heat flux in each point of blade surface within a single experiment. The error of determination of local heat transfer coefficients using this method does not exceed 8% for blades with radial channels. An important feature of the method is that the heat load remains unchanged during the experiment and the blade outer surface temperature equals zinc melting point. The verification of thermal-hydraulic model of high-pressure turbine blade with cooling allowing asymmetrical heat removal from pressure and suction sides was carried out using the developed method. An analysis of heat transfer coefficients confirmed the high level of heat transfer in the leading edge, whose value is comparable with jet impingement heat transfer. The maximum of the heat transfer coefficients is shifted from the critical point of the leading edge to the pressure side.","PeriodicalId":46335,"journal":{"name":"International Journal of Rotating Machinery","volume":"2018 1","pages":"1-10"},"PeriodicalIF":0.9,"publicationDate":"2018-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2018/6780137","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42665589","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: 4

Interpreting Aerodynamics of a Transonic Impeller from Static Pressure Measurements 从静压测量解释跨声速叶轮的空气动力学

IF 0.9

International Journal of Rotating Machinery Pub Date : 2018-04-10 DOI: 10.1155/2018/7281691

Fangyuan Lou, John C. Fabian, N. Key

{"title":"Interpreting Aerodynamics of a Transonic Impeller from Static Pressure Measurements","authors":"Fangyuan Lou, John C. Fabian, N. Key","doi":"10.1155/2018/7281691","DOIUrl":"https://doi.org/10.1155/2018/7281691","url":null,"abstract":"This paper investigates the aerodynamics of a transonic impeller using static pressure measurements. The impeller is a high-speed, high-pressure-ratio wheel used in small gas turbine engines. The experiment was conducted on the single stage centrifugal compressor facility in the compressor research laboratory at Purdue University. Data were acquired from choke to near-surge at four different corrected speeds (Nc) from 80% to 100% design speed, which covers both subsonic and supersonic inlet conditions. Details of the impeller flow field are discussed using data acquired from both steady and time-resolved static pressure measurements along the impeller shroud. The flow field is compared at different loading conditions, from subsonic to supersonic inlet conditions. The impeller performance was strongly dependent on the inducer, where the majority of relative diffusion occurs. The inducer diffuses flow more efficiently for inlet tip relative Mach numbers close to unity, and the performance diminishes at other Mach numbers. Shock waves emerging upstream of the impeller leading edge were observed from 90% to 100% corrected speed, and they move towards the impeller trailing edge as the inlet tip relative Mach number increases. There is no shock wave present in the inducer at 80% corrected speed. However, a high-loss region near the inducer throat was observed at 80% corrected speed resulting in a lower impeller efficiency at subsonic inlet conditions.","PeriodicalId":46335,"journal":{"name":"International Journal of Rotating Machinery","volume":"2018 1","pages":"1-9"},"PeriodicalIF":0.9,"publicationDate":"2018-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2018/7281691","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46290269","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

Optimized Blade Design of Counter-Rotating-Type Pump-Turbine Unit Operating in Pump and Turbine Modes 对转式水泵水轮机组在水泵和水轮机模式下的叶片优化设计

IF 0.9

International Journal of Rotating Machinery Pub Date : 2018-04-03 DOI: 10.1155/2018/6069780

Jin-Woo Kim, J. Suh, Young-Seok Choi, Kyoung-Yong Lee, T. Kanemoto, Jin-Hyuk Kim

引用次数: 5

Investigation on the Effects of Structural Dynamics on Rolling Bearing Fault Diagnosis by Means of Multibody Simulation 基于多体仿真的结构动力学对滚动轴承故障诊断影响研究

IF 0.9

International Journal of Rotating Machinery Pub Date : 2018-03-13 DOI: 10.1155/2018/5159189

Reza Golafshan, G. Jacobs, Matthias Wegerhoff, P. Drichel, J. Berroth

{"title":"Investigation on the Effects of Structural Dynamics on Rolling Bearing Fault Diagnosis by Means of Multibody Simulation","authors":"Reza Golafshan, G. Jacobs, Matthias Wegerhoff, P. Drichel, J. Berroth","doi":"10.1155/2018/5159189","DOIUrl":"https://doi.org/10.1155/2018/5159189","url":null,"abstract":"The present study aims to combine the fields modal analysis and signal processing and to show the use of Frequency Response Function (FRF), as a vibration transfer path, in enhancing reliability and abilities of the next generation vibration-based rolling bearing condition monitoring (CM) systems in complex mechanical systems. In line with this purpose, the hereby-presented paper employs an appropriate numerical model, that is, Multibody Simulation (MBS) of a vehicle’s drivetrain as a manner for numerical modal and structural analyses. For this, first, the principles of vibration-based bearing fault detection are reviewed and presented. Following that, a summary of MBS modelling and validating strategies are given. Then, the validated MBS model is used as a case study for further investigations. The results can confirm existence of challenges in fault detection of rolling bearings, in particular in complex mechanical systems. In further discussions, the capability of FRFs in fault localization and determination of ideal sensor positions is discussed in some detail. Finally, concluding remarks and suggestions for future works are summarized.","PeriodicalId":46335,"journal":{"name":"International Journal of Rotating Machinery","volume":"2018 1","pages":"1-18"},"PeriodicalIF":0.9,"publicationDate":"2018-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2018/5159189","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45377699","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: 11