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International Journal of Rotating Machinery最新文献

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Time-Dependent Effects of Glaze Ice on the Aerodynamic Characteristics of an Airfoil 釉冰对翼型气动特性的时变影响
IF 0.9
International Journal of Rotating Machinery Pub Date : 2018-03-07 DOI: 10.1155/2018/2981739
N. Tabatabaei, M. Cervantes, C. Trivedi
{"title":"Time-Dependent Effects of Glaze Ice on the Aerodynamic Characteristics of an Airfoil","authors":"N. Tabatabaei, M. Cervantes, C. Trivedi","doi":"10.1155/2018/2981739","DOIUrl":"https://doi.org/10.1155/2018/2981739","url":null,"abstract":"The main objective of this study is to estimate the dynamic loads acting over a glaze-iced airfoil. This work studies the performance of unsteady Reynolds-averaged Navier-Stokes (URANS) simulations in predicting the oscillations over an iced airfoil. The structure and size of time-averaged vortices are compared to measurements. Furthermore, the accuracy of a two-equation eddy viscosity turbulence model, the shear stress transport (SST) model, is investigated in the case of the dynamic load analysis over a glaze-iced airfoil. The computational fluid dynamic analysis was conducted to investigate the effect of critical ice accretions on a 0.610 m chord NACA 0011 airfoil. Leading edge glaze ice accretion was simulated with flat plates (spoiler-ice) extending along the span of the blade. Aerodynamic performance coefficients and pressure profiles were calculated and validated for the Reynolds number of 1.83 × 106. Furthermore, turbulent separation bubbles were studied. The numerical results confirm both time-dependent phenomena observed in previous similar measurements: (1) low-frequency mode, with a Strouhal number –0.02, and (2) higher frequency mode with a Strouhal number –0.69. The higher frequency motion has the same characteristics as the shedding mode and the lower frequency motion has the flapping mode characteristics.","PeriodicalId":46335,"journal":{"name":"International Journal of Rotating Machinery","volume":"2018 1","pages":"1-14"},"PeriodicalIF":0.9,"publicationDate":"2018-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2018/2981739","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44053094","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: 3
Axial Fan Performance under the Influence of a Uniform Ambient Flow Field 均匀环境流场影响下的轴流风机性能
IF 0.9
International Journal of Rotating Machinery Pub Date : 2018-03-01 DOI: 10.1155/2018/6718750
Till Heinemann, S. Becker
{"title":"Axial Fan Performance under the Influence of a Uniform Ambient Flow Field","authors":"Till Heinemann, S. Becker","doi":"10.1155/2018/6718750","DOIUrl":"https://doi.org/10.1155/2018/6718750","url":null,"abstract":"In their application to air-cooled condensers, axial fans are often subject to the detrimental influence of ambient flow fields at their inlet or outlet. While effects have been investigated mostly under perpendicular cross-flow conditions on fans operating as part of an array in their target design point, this study aims at examining the integral influence of uniform ambient flow fields on a single axial fan over a wide operating range. For this purpose, a wind tunnel fan test rig has been designed and assessed. Multiple angles between uniform ambient flow field and fan axis are examined in their integral influence on the characteristic curve of two distinct industrial axial fans with varying inlet modifications. Increasingly with the fan flow rate, perpendicular inlet cross-flow was found to always have a detrimental influence on fan performance. The straight bladed fan reacted less sensitively than the forward skewed fan, and the adverse cross-flow influence could be reduced with an inlet guard grille and with short conical shroud extensions. Cross-flow at the fan outlet showed potential static fan pressure increases at low flow rates.","PeriodicalId":46335,"journal":{"name":"International Journal of Rotating Machinery","volume":" ","pages":"1-10"},"PeriodicalIF":0.9,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2018/6718750","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49149920","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: 5
Investigations on the Effect of Radius Rotor in Combined Darrieus-Savonius Wind Turbine 转子半径对达-萨联合风力机的影响研究
IF 0.9
International Journal of Rotating Machinery Pub Date : 2018-03-01 DOI: 10.1155/2018/3568542
Kaprawi Sahim, Dyos Santoso, D. Puspitasari
{"title":"Investigations on the Effect of Radius Rotor in Combined Darrieus-Savonius Wind Turbine","authors":"Kaprawi Sahim, Dyos Santoso, D. Puspitasari","doi":"10.1155/2018/3568542","DOIUrl":"https://doi.org/10.1155/2018/3568542","url":null,"abstract":"Renewable sources of energy, abundant in availability, are needed to be exploited with adaptable technology. For wind energy, the wind turbine is very well adapted to generate electricity. Among the different typologies, small scale Vertical Axis Wind Turbines (VAWT) present the greatest potential for off-grid power generation at low wind speeds. The combined Darrieus-Savonius wind turbine is intended to enhance the performance of the Darrieus rotor in low speed. In combined turbine, the Savonius buckets are always attached at the rotor shaft and the Darrieus blades are installed far from the shaft which have arm attaching to the shaft. A simple combined turbine offers two rotors on the same shaft. The combined turbine that consists of two Darrieus and Savonius blades was tested in wind tunnel test section with constant wind velocity and its performance was assessed in terms of power and torque coefficients. The study gives the effect of the radius ratio between Savonius and Darrieus rotor on the performance of the turbine. The results show that there is a significant influence on the turbine performance if the radius ratio was changed.","PeriodicalId":46335,"journal":{"name":"International Journal of Rotating Machinery","volume":"2018 1","pages":"1-7"},"PeriodicalIF":0.9,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2018/3568542","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49020038","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: 35
Spatial Fluctuating Pressure Calculation of Underwater Counter Rotating Propellers under Noncavitating Condition 无空化条件下水下对转螺旋桨的空间脉动压力计算
IF 0.9
International Journal of Rotating Machinery Pub Date : 2018-02-19 DOI: 10.1155/2018/2909546
L. Hou, A. Hu
{"title":"Spatial Fluctuating Pressure Calculation of Underwater Counter Rotating Propellers under Noncavitating Condition","authors":"L. Hou, A. Hu","doi":"10.1155/2018/2909546","DOIUrl":"https://doi.org/10.1155/2018/2909546","url":null,"abstract":"The spatial fluctuating pressure field (FPF) of counter rotating propeller (CRP) under noncavitating condition is investigated. The hydrodynamic performance and pressure distributions on the blade surfaces are obtained through low-order potential-based panel method, which is also used to analyze the hydrodynamic interaction between the front and rear propellers of CRP as well as the hydrodynamic interference between any solid surface and propeller. The interaction between the given solid spherical surface and propeller is used to simulate the spatial FPF of propeller, and the fluctuating pressure induced by a propeller over one revolution is analyzed in frequency domain through fast Fourier transform. The method proposed is validated through two given propellers by comparing the calculation results with test data. The FPFs of the front and rear propellers are calculated and compared with that of the corresponding single propeller. The result shows that the CRP produces weaker FPF compared with the single propeller.","PeriodicalId":46335,"journal":{"name":"International Journal of Rotating Machinery","volume":" ","pages":"1-12"},"PeriodicalIF":0.9,"publicationDate":"2018-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2018/2909546","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47014997","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
Crack Detection of Fan Blade Based on Natural Frequencies 基于固有频率的风机叶片裂纹检测
IF 0.9
International Journal of Rotating Machinery Pub Date : 2018-02-05 DOI: 10.1155/2018/2095385
Men Yu, Fu Sheng, Y. Gao, Zheng Hao, Yonggang Xu
{"title":"Crack Detection of Fan Blade Based on Natural Frequencies","authors":"Men Yu, Fu Sheng, Y. Gao, Zheng Hao, Yonggang Xu","doi":"10.1155/2018/2095385","DOIUrl":"https://doi.org/10.1155/2018/2095385","url":null,"abstract":"A simple method was developed to detect damage based on a discrete mathematical model for fan blades using changes in natural frequencies combined with a fluid-structure analysis. In addition, a numerical approach was developed for the fluid-structure analysis. The results of numerical simulation provided the natural frequency data for each mode under different locations and sizes of a single crack in a blade. A fault database was built using Matlab. The damage of a blade was detected using the changes in natural frequencies. This study will assist in investigating the effect of a crack on a structure from different perspectives; the simulation results show the effectiveness of this approach.","PeriodicalId":46335,"journal":{"name":"International Journal of Rotating Machinery","volume":"2018 1","pages":"1-13"},"PeriodicalIF":0.9,"publicationDate":"2018-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2018/2095385","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41627177","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: 14
Global Sensitivity Analysis of High Speed Shaft Subsystem of a Wind Turbine Drive Train 风力发电机传动系高速轴子系统的全局灵敏度分析
IF 0.9
International Journal of Rotating Machinery Pub Date : 2018-02-01 DOI: 10.1155/2018/9674364
S. Asadi, V. Berbyuk, H. Johansson
{"title":"Global Sensitivity Analysis of High Speed Shaft Subsystem of a Wind Turbine Drive Train","authors":"S. Asadi, V. Berbyuk, H. Johansson","doi":"10.1155/2018/9674364","DOIUrl":"https://doi.org/10.1155/2018/9674364","url":null,"abstract":"The wind turbine dynamics are complex and critical area of study for the wind industry. Quantification of the effective factors to wind turbine performance is valuable for making improvements to both power performance and turbine health. In this paper, the global sensitivity analysis of validated mathematical model for high speed shaft drive train test rig has been developed in order to evaluate the contribution of systems input parameters to the specified objective functions. The drive train in this study consists of a 3-phase induction motor, flexible shafts, shafts’ coupling, bearing housing, and disk with an eccentric mass. The governing equations were derived by using the Lagrangian formalism and were solved numerically by Newmark method. The variance based global sensitivity indices are introduced to evaluate the contribution of input structural parameters correlated to the objective functions. The conclusion from the current research provides informative beneficial data in terms of design and optimization of a drive train setup and also can provide better understanding of wind turbine drive train system dynamics with respect to different structural parameters, ultimately designing more efficient drive trains. Finally, the proposed global sensitivity analysis (GSA) methodology demonstrates the detectability of faults in different components.","PeriodicalId":46335,"journal":{"name":"International Journal of Rotating Machinery","volume":"2018 1","pages":"1-20"},"PeriodicalIF":0.9,"publicationDate":"2018-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2018/9674364","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43057220","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
Performance and Internal Flow of a Dental Air Turbine Handpiece 牙科空气涡轮手柄的性能和内部流动
IF 0.9
International Journal of Rotating Machinery Pub Date : 2018-01-30 DOI: 10.1155/2018/1826489
Y. Nishi, H. Fushimi, Kazuo Shimomura, T. Hasegawa
{"title":"Performance and Internal Flow of a Dental Air Turbine Handpiece","authors":"Y. Nishi, H. Fushimi, Kazuo Shimomura, T. Hasegawa","doi":"10.1155/2018/1826489","DOIUrl":"https://doi.org/10.1155/2018/1826489","url":null,"abstract":"An air turbine handpiece is a dental abrasive device that rotates at high speed and uses compressed air as the driving force. It is characterized by its small size, light weight, and painless abrading due to its high-speed rotation, but its torque is small and noise level is high. Thus, to improve the performance of the air turbine handpiece, we conducted a performance test of an actual handpiece and a numerical analysis that modeled the whole handpiece; we also analyzed the internal flow of the handpiece. Results show that experimental and calculated values were consistent for a constant speed load method with the descending speed of 1 mm/min for torque and turbine output. When the tip of the blade was at the center of the nozzle, the torque was at its highest. This is likely because the jet from the nozzle entered the tip of the blade from a close distance that would not reduce the speed and exited along the blade.","PeriodicalId":46335,"journal":{"name":"International Journal of Rotating Machinery","volume":"2018 1","pages":"1-11"},"PeriodicalIF":0.9,"publicationDate":"2018-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2018/1826489","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49328622","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: 5
Corrigendum to “Theoretical Model for the Performance of Liquid Ring Pump Based on the Actual Operating Cycle” 《基于实际运行周期的液环泵性能理论模型》的勘误表
IF 0.9
International Journal of Rotating Machinery Pub Date : 2018-01-01 DOI: 10.1155/2018/4507324
Simin Huang, Jing He, Xueqiang Wang, Guangqi Qiu
{"title":"Corrigendum to “Theoretical Model for the Performance of Liquid Ring Pump Based on the Actual Operating Cycle”","authors":"Simin Huang, Jing He, Xueqiang Wang, Guangqi Qiu","doi":"10.1155/2018/4507324","DOIUrl":"https://doi.org/10.1155/2018/4507324","url":null,"abstract":"Liquid ring pump is widely applied in many industry fields due to the advantages of isothermal compression process, simple structure, and liquid-sealing. Based on the actual operating cycle of “suction-compression-discharge-expansion,” a universal theoretical model for performance of liquid ring pump was established in this study, to solve the problem that the theoretical models deviated from the actual performance in operating cycle. With the major geometric parameters and operating conditions of a liquid ring pump, the performance parameters such as the actual capacity for suction and discharge, shaft power, and global efficiency can be conveniently predicted by the proposed theoretical model, without the limitation of empiric range, performance data, or the detailed 3D geometry of pumps. The proposed theoretical model was verified by experimental performances of liquid ring pumps and could provide a feasible tool for the application of liquid ring pump.","PeriodicalId":46335,"journal":{"name":"International Journal of Rotating Machinery","volume":"2018 1","pages":"1-1"},"PeriodicalIF":0.9,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2018/4507324","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64732905","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
Development and Application of Integrated Aerodynamic Protuberant Foil Journal and Thrust Bearing in Turboexpander 涡轮膨胀机气动凸叶轴颈与推力轴承的研制与应用
IF 0.9
International Journal of Rotating Machinery Pub Date : 2017-12-31 DOI: 10.1155/2017/8430943
T. Lai, Yu Guo, Wen Wang, Yu Wang, Yu Hou
{"title":"Development and Application of Integrated Aerodynamic Protuberant Foil Journal and Thrust Bearing in Turboexpander","authors":"T. Lai, Yu Guo, Wen Wang, Yu Wang, Yu Hou","doi":"10.1155/2017/8430943","DOIUrl":"https://doi.org/10.1155/2017/8430943","url":null,"abstract":"Foil bearing provides compliant support and moderate Coulomb friction for rotor-bearing system, which is conducive to stability and reliability of high speed rotating machinery. In this paper, both hydrodynamic lubricated foil journal and foil thrust bearings are applied in a 150 m3·h−1 turboexpander for air separation. In the bearings, protuberant foil is chosen as the supporting subfoil due to its merits of easy fabrication and assembly. Static loading and deflection of the bearings are tested, respectively, before integration into the turboexpander. Afterwards, the loading and deflection curves of the journal and thrust bearings are polynomial fitted using least-square method. Then, performance tests are carried out on the rotor-bearing system, including transient speed-up, high speed, and speed-down processes. In the tests, the turboexpander supported by the hydrodynamic foil bearings operates smoothly with repeatability. Maximal rotor speed of the turboexpander reaches 52000 rpm with hydrodynamic lubricated protuberant foil bearings.","PeriodicalId":46335,"journal":{"name":"International Journal of Rotating Machinery","volume":" ","pages":"1-12"},"PeriodicalIF":0.9,"publicationDate":"2017-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2017/8430943","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44165163","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: 8
Wind generation systems including energy storage 风力发电系统，包括能源储存
IF 0.9
International Journal of Rotating Machinery Pub Date : 2017-11-09 DOI: 10.1155/2017/7424812
Lei Chen, L. Ren, Lin Zhu, Tao Wang, Yuan Li
{"title":"Wind generation systems including energy storage","authors":"Lei Chen, L. Ren, Lin Zhu, Tao Wang, Yuan Li","doi":"10.1155/2017/7424812","DOIUrl":"https://doi.org/10.1155/2017/7424812","url":null,"abstract":"1School of Electrical Engineering, Wuhan University, Wuhan 430072, China 2State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, China 3Department of Electrical Engineering and Computer Science, University of Tennessee, Knoxville, TN 37996, USA 4Waseda Research Institute for Science and Engineering, Waseda University, Tokyo 169-8555, Japan 5School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798","PeriodicalId":46335,"journal":{"name":"International Journal of Rotating Machinery","volume":"2017 1","pages":"1-2"},"PeriodicalIF":0.9,"publicationDate":"2017-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2017/7424812","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46835220","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: 3
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