首页|液力变矩器导轮叶片出口角对性能的影响分析

液力变矩器导轮叶片出口角对性能的影响分析

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液力变矩器导轮叶片角度优化是改进其性能的一种重要且经济的设计方案.基于计算流体动力学数值模拟液力变矩器流场并预测外特性,重构导轮流道三维涡系结构并提取二维截面流速场和涡量场,通过内/外特性的定性和定量对比分析,揭示导轮叶片出口角变化对液力变矩器性能的影响规律.结果表明:①在低速比工况下,减小导轮叶片出口角,变矩比基本不变,泵轮转矩系数明显降低,尤其在28°～22°角度变化区间内降幅最为敏感;②液流冲击导轮叶片头部形成圆柱绕流,随着导轮叶片出口角减小,圆柱绕流连贯性强化,曲率半径逐渐减小,叶片压力面附着涡拉伸变形,叶片吸力面长条涡逐渐向流道中部偏移,出口角为20°时其与附着涡汇集,能量集聚,引起叶片尾部射流流速增大,造成携能多尺度涡撕裂、碰撞,导致涡脱落现象加剧;③减小导轮叶片出口角引起泵轮进口流速增大,导致泵轮转矩降低,致使泵轮转矩系数下降.基于流场结构与外特性参数的分析,揭示导轮叶片出口角对性能的影响规律,研究结果可为液力变矩器叶片设计及性能优化提供一定的技术指导.
Analysis of Influence of Stator Blade Outlet Angle on Performance of Torque Converter
Torque converter stator blade angle optimization is an important and economical design solution to improve its performance.Based on computational fluid dynamics,the flow field of the torque converter is simulated numerically and the external characteristics are predicted.The three-dimensional vortex system structure of the stator channel is reconstructed and the two-dimensional cross section velocity field and vorticity field are extracted.Through qualitative and quantitative comparative analysis of the intemal/external characteristics,the influence law of the change of the stator blade outlet angle on the performance of the torque converter is revealed.The results show as follows:① Under low speed ratio conditions,when the stator blade outlet angle is reduced,the torque ratio is basically unchanged,and the torque coefficient of the pump is significantly reduced,especially in the angle variation range of 28°-22°;(2)Liquid flow impacts the head of the stator blade to form a cylindrical flow around it.As the stator blade outlet angle decreases,the continuity of the flow around the cylinder is strengthened,and the curvature radius gradually decreases.The blade pressure surface attachment vortex is stretched and deformed,and the blade suction surface long vortex gradually moves toward the middle of the flow channel.When the outlet angle is 20°,it gathers with the attached vortex,and the energy accumulates,causing the jet flow rate at the tail of the blade to increase.The multi-scale vortex carrying energy is torn and collided,and the vortex shedding phenomenon is intensified.(3)Reducing the stator blade outlet angle causes the inlet flow rate of the pump to increase,resulting in the reduction of the pump torque,resulting in the reduction of the pump torque coefficient.Based on the analysis of flow field structure and external characteristic parameters,the influence of stator blade outlet angle on the performance is revealed.The research results can provide some technical guidance for the blade design and performance optimization of torque converter.

torque convertercomputational fluid dynamicsblade outlet anglethree-dimensional vortexvelocity field

柴博森、丛皓、杨昊旻、潘军、朱国仁

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吉林大学机械与航空航天工程学院 长春 130025

吉林大学重庆研究院 重庆 401120

吉林大学汽车底盘集成与仿生全国重点实验室 长春 130025

液力变矩器 计算流体动力学 叶片出口角 三维涡 流速场

国家自然科学基金重庆市自然科学基金吉林大学汽车底盘集成与仿生全国重点实验室自由探索吉林省教育厅科学研究长安大学中央高校基本科研业务费专项中国博士后科学基金

52075212CSTB2023NSCQ-MSX0321asclzytsxm-202010JJKH20220977KJ3001022515112018M641776

2024

10.3901/JME.2024.11.105

机械工程学报
中国机械工程学会

机械工程学报

CSTPCD北大核心
影响因子：1.362
ISSN：0577-6686
年,卷(期)：2024.60(11)