凸舌油槽对摆线转子泵空化特性的影响
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摘要
为了改善摆线转子泵的空化特性,提出一种增加极限进出油面积的凸舌油槽结构方案,建立摆线转子泵凸舌油槽结构模型,采用RNG k-ε湍流模型对不同工况下摆线转子泵的内部空化流动进行仿真模拟,分析摆线转子泵凸舌油槽结构在不同转速、不同转子位置时的空化特性,并对不同监测点的含气率及轴向含气率不均匀度进行分析,同时对不同旋转速度及不同进口压力条件下摆线转子泵的空化特性进行试验及对比分析。结果表明:凸舌油槽结构在3种转速下对空化均有所缓解,改善的空化位置主要位于靠近最大啮合容积处;高转速时凸舌油槽结构对转子区域内含气率改善最为明显,低转速下凸舌油槽结构对空化改善效果较小;空化沿轴向具有不均匀性,在进油侧最小齿间容积处、转子底部空化严重,而在较大的齿间容积处、转子中上部的空化更为严重。摆线转子泵的容积效率模拟值与试验值较为吻合,且变化趋势一致,不同进口压力下凸舌油槽的容积效率均高于原模型,凸舌油槽的空化特性优于原模型。
In order to improve the cavitation characteristics of cycloidal gerotor pump,a convex tongue oil groove structure was put forward with an increasing limit of oil flow,and the structure model of cycloidal gerotor pump convex tongue was established. The RNG k-ε turbulence model was used to simulate the internal cavitation flow of cycloidal gerotor pump under different working conditions,the cavitation characteristics of cycloidal gerotor pump convex tongue oil groove were analyzed at different speeds and rotor positions,and the gas rate and axial gas bearing rate of different monitoring points were further studied. And the cavitation characteristics of the cycloidal gerotor pump at different rotation speeds and different inlet pressure conditions were tested and compared. The results showed that the structure of the convex tongue can reduce the cavitation at three kinds of rotational speed,the improved cavitation position was mainly located near the maximum inter-tooth volume; the convexity groove had the most obvious improvement in the air rate of the rotor region at high speed,less effective at low speed; the cavitation along the axial direction had an inhomogeneity,the bottom cavitation was more serious in the minimum inter-tooth volume of the inlet side,and the cavitation in the upper part of the rotor was more serious in the larger tooth space. The volumetric efficiency simulation value of the cycloidal rotor pump was in good agreement with the experimental value. The volumetric efficiency of the tongue oil groove was higher than that of the original model under different inlet pressures,and the cavitation characteristics of the tongue oil groove were better than that of the original model.
In order to improve the cavitation characteristics of cycloidal gerotor pump,a convex tongue oil groove structure was put forward with an increasing limit of oil flow,and the structure model of cycloidal gerotor pump convex tongue was established. The RNG k-ε turbulence model was used to simulate the internal cavitation flow of cycloidal gerotor pump under different working conditions,the cavitation characteristics of cycloidal gerotor pump convex tongue oil groove were analyzed at different speeds and rotor positions,and the gas rate and axial gas bearing rate of different monitoring points were further studied. And the cavitation characteristics of the cycloidal gerotor pump at different rotation speeds and different inlet pressure conditions were tested and compared. The results showed that the structure of the convex tongue can reduce the cavitation at three kinds of rotational speed,the improved cavitation position was mainly located near the maximum inter-tooth volume; the convexity groove had the most obvious improvement in the air rate of the rotor region at high speed,less effective at low speed; the cavitation along the axial direction had an inhomogeneity,the bottom cavitation was more serious in the minimum inter-tooth volume of the inlet side,and the cavitation in the upper part of the rotor was more serious in the larger tooth space. The volumetric efficiency simulation value of the cycloidal rotor pump was in good agreement with the experimental value. The volumetric efficiency of the tongue oil groove was higher than that of the original model under different inlet pressures,and the cavitation characteristics of the tongue oil groove were better than that of the original model.
引文
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[17] LIU J J,SONG R,CUI M M. Improvement of predictions of petrophysical transport behavior using three-dimensional finite volume element model with micro-CT images[J]. Journal of Hydrodynamics,2015,27(2):234-241.
[18] SUNG H J,MIN H K,NAM Y J,et al. Design and experimental verification of a port plate in a gerotor pump to reduce pressure pulsation[J]. Journal of Mechanical Science and Technology,2018,32(2):671-678.
[19] GAMEZ-MONTERO P,CASTILLA R,CODINA E,et al. Gero MAG:in-house prototype of an innovative sealed,compact and non-shaft-driven gerotor pump with magnetically-driving outer rotor[J]. Energies,2017,10(4):435.
[20]王福军.流体机械旋转湍流计算模型研究进展[J/OL].农业机械学报,2016,47(2):1-14.WANG Fujun. Research progress of computational model for rotating turbulent flow in fluid machinery[J/OL]. Transactions of the Chinese Society for Agricultural Machinery,2016,47(2):1-14. http:∥www. j-csam. org/jcsam/ch/reader/view_abstract. aspx? flag=1&file_no=20160201&journal_id=jcsam. DOI:10. 6041/j. issn. 1000-1298. 2016. 02. 001.(in Chinese)
[21] DARYUS A,SISWANTARA A,DARMAWAN S,et al. CFD simulation of turbulent flows in Proto X-3 bioenergy micro gas turbine combustor using STD k-εand RNG k-εmodel for green building application[J]. International Journal of Technology,2016,7(2):204-211.
[2]李术才,李梦天,张霄,等.基于数值模拟与实验的三角转子泵性能研究[J/OL].农业机械学报,2018,49(9):389-396.LI Shucai,LI Mengtian,ZHANG Xiao,et al. Investigation on performance of triangular rotor pump based on numerical simulation and experiment[J/OL]. Transactions of the Chinese Society for Agricultural Machinery,2018,49(9):389-396.http:∥www. j-csam. org/jcsam/ch/reader/view_abstract. aspx? flag=1&file_no=20180946&journal_id=jcsam. DOI:10.6041/j. issn. 1000-1298. 2018. 09. 046.(in Chinese)
[3] PELLEGRI M,VACCA A. Numerical simulation of gerotor pumps considering rotor micro-motions[J]. Meccanica,2017,52(8):1851-1870.
[4] KARAMOOZ R M R,FOROUZAN M R,MOOSAVI H. Flow irregularity and wear optimization in epitrochoidal gerotor pumps[J]. Meccanica,2012,47(4):917-928.
[5]牟介刚,刘涛,谷云庆,等.凸舌油槽对摆线转子泵脉动特性的影响[J].振动与冲击,2018,37(21):262-266.MOU Jiegang,LIU Tao,GU Yunqing,et al. Effects of tongue oil groove on fluctuation characteristics of a cycloid rotor pump[J]. Journal of Vibration and Shock,2018,37(21):262-266.(in Chinese)
[6] JACAZIO G,DE MARTIN A. Influence of rotor profile geometry on the performance of an original low-pressure gerotor pump[J]. Mechanism and Machine Theory,2016,100:296-312.
[7] ANTONIAK P,STRYCZEK J. Visualization study of the flow processes and phenomena in the external gear pump[J]. Archives of Civil and Mechanical Engineering,2018,18(4):1103-1115.
[8] STRYCZEK J,BEDNARCZYK S,BIERNACKI K. Gerotor pump with POM gears:design,production technology,research[J]. Archives of Civil and Mechanical Engineering,2014,14(3):391-397.
[9] JAMADAR M,JOSE A,RAMDASI S S,et al. Development of in-house competency to build compact gerotor oil pump for high speed diesel engine application[C]∥8th SAEINDIA International Mobility Conference and Exposition and Commercial Vehicle Engineering Congress 2013,2013.
[10] BUONO D,COLA F D S,SENATORE A,et al. Modelling approach on a gerotor pump working in cavitation conditions[C]∥ATI 2016-71st Conference of the Italian Thermal Machines Engineering Association,Torino,Italy,2016:701-709.
[11] BUONO D,SIANO D,FROSINA E,et al. Gerotor pump cavitation monitoring and fault diagnosis using vibration analysis through the employment of auto-regressive-moving-average technique[J]. Simulation Modelling Practice and Theory,2017,71:61-82.
[12] SHAH Y G,VACCA A,DABIRI S,et al. A fast lumped parameter approach for the prediction of both aeration and cavitation in gerotor pumps[J]. Meccanica,2018,53(1-2):1-17.
[13] SIANO D,FROSINA E,SENATORE A,et al. Diagnostic process by using vibrational sensors for monitoring cavitation phenomena in a getoror pump used for automotive applications[C]∥ATI 2017-72nd Conference of the Italian Thermal Machines Engineering Association,Lecce,Italy,2017:1115-1122.
[14] ERTURK N,VERNET A,CASTILLA R,et al. Experimental analysis of the flow dynamics in the suction chamber of an external gear pump[J]. International Journal of Mechanical Sciences,2011,53(2):135-144.
[15] CASTILLA R,GAMEZ-MONTERO P J,RAUSH G,et al. Method for fluid flow simulation of a gerotor pump using Open FOAM[J]. Journal of Fluids Engineering,2017,139(11):111101.
[16] PELLEGRI M,VACCA A,DEVENDRAN R S,et al. A Lumped parameter approach for gerotor pumps:model formulation and experimental validation[C]∥10th International Fluid Power Conference,2016:465-476
[17] LIU J J,SONG R,CUI M M. Improvement of predictions of petrophysical transport behavior using three-dimensional finite volume element model with micro-CT images[J]. Journal of Hydrodynamics,2015,27(2):234-241.
[18] SUNG H J,MIN H K,NAM Y J,et al. Design and experimental verification of a port plate in a gerotor pump to reduce pressure pulsation[J]. Journal of Mechanical Science and Technology,2018,32(2):671-678.
[19] GAMEZ-MONTERO P,CASTILLA R,CODINA E,et al. Gero MAG:in-house prototype of an innovative sealed,compact and non-shaft-driven gerotor pump with magnetically-driving outer rotor[J]. Energies,2017,10(4):435.
[20]王福军.流体机械旋转湍流计算模型研究进展[J/OL].农业机械学报,2016,47(2):1-14.WANG Fujun. Research progress of computational model for rotating turbulent flow in fluid machinery[J/OL]. Transactions of the Chinese Society for Agricultural Machinery,2016,47(2):1-14. http:∥www. j-csam. org/jcsam/ch/reader/view_abstract. aspx? flag=1&file_no=20160201&journal_id=jcsam. DOI:10. 6041/j. issn. 1000-1298. 2016. 02. 001.(in Chinese)
[21] DARYUS A,SISWANTARA A,DARMAWAN S,et al. CFD simulation of turbulent flows in Proto X-3 bioenergy micro gas turbine combustor using STD k-εand RNG k-εmodel for green building application[J]. International Journal of Technology,2016,7(2):204-211.