农用运输车用液力缓速器量纲分析与试验研究

为研究农用运输车用液力缓速器的制动机理，基于仔定理对影响液力缓速器制动性能的相关参数进行了量纲分析，得到了液力缓速器制动力矩与雷诺准则数、贝克莱准则数和欧拉准则数的关系式。以农用运输车液力缓速器样机THN15为例，综合运用台架试验和CFD计算，研究了不同充液率下雷诺准则数、贝克莱准则数和欧拉准则数对制动力矩的影响规律。结果显示：制动力矩都是随着欧拉准则数的增大而减小，随着雷诺准则数和贝克莱准则数的增大而增大；38%充液率时，雷诺准则数和贝克莱准则数随转速增大而减小，欧拉准则数则随转速增大而增大；95%充液率时，雷诺准则数和贝克莱准则数随转速增大而增大，欧拉准则数则随转速增大而减小。研究结果对完善农用运输车液力缓速器的设计及产品开发有较好的参考价值。

Analysis and Experimental Research on Farm Transport Vehicle Hydraulic Retarder Caliber Steel

In order to research farm transport vehicle hydraulic retarder braking mechanism,based on the analysis of theorem of PI to the related parameters affecting the braking performance of the hydraulic retarder on the dimensional,this paper concludes the relation quota between the braking torque and hydraulic retarder rule of Reynolds number,Berkeley code number and the rule of euler number.Taking farm transporter prototype THN15 hydraulic retarder as an example,this paper applies use of bench test and CFD calculation,studies the rule of Reynolds number under different charging rates,Berkeley criteria and euler rule of the influence law of braking torque.The result shows the braking torque decreases as the rule of euler number increases,as the rule of Reynolds number and Berkeley code number increases;38%liquid rate, the rule of Reynolds number and Berkeley code number decreases with increasing speed,rule of euler number increases with the increase of rotational speed and;95% liquid rate, Renault,criterion and rule of Berkeley with speed increases,the rule of euler number decreases with increasing rotating speed.The research results has good reference value to improve the farm transporter of hydraulic retarder design and product development.