基于鱼体结构的仿生型液力变矩器叶片环量分配规律

Circulation Distribution of Bionic Blades from Hydraulic Torque Converter Based on Fish Bodies

提出了一种基于鱼体结构的液力变矩器叶片环量分配规律.该方法利用逆向工程方法提取了鱼类体型的元素,提出了液力变矩器各叶轮叶片的仿生多项式环量分配方案,设计出了类鱼体的仿生叶片.通过采用Smagorinsky亚格子应力模型的分离涡模拟,分别对仿生叶片和原始叶片的流道模型进行了三维流场的数值计算.结果表明:通过将原始叶片的仿真预测结果与试验结果进行对比,证明了该数值模拟方法的有效性;在不改变原始叶片的重要参数的情况下,采用仿生环量分配规律设计出的仿生叶片,可以提高液力变矩器的最高效率值,最高效率可以提高1.5%.对比分析了仿生前后的流动结构,并采用Rothalpy对比了仿生叶片与原有叶片的能量损失,结果与性能预测值相吻合,验证了研究的可行性.

A circulation distribution of bionic blades from hydraulic torque converter was established based on fish bodies. The reverse engineering was used to extract fish bodies＇ elements, and circulation distribution schemes of every impeller blade were proposed and then bionic blades models were established. A detached eddy simulation based on Smagorinsky sub- grid stress model was adopted to numerically calculate three-dimensional flow fields of channel models for bionic blades and original blades respectively. Finally, the results reveal that the numerical simulation is effective through comparative analysis of simulation and experiment results from original blades; bionic blades designed from bionic circulation distribution possessing excellent drag reduction performance can increase the highest efficiency in the case that the major parameters of original blades don＇t be changed. The highest efficiency can be increased by 1.5 percent from original hydraulic torque converter; the flow conditions of bionic and original fields were analyzed contrastively. The Rothalpy was used to compare energy loss of two kinds of blades. The results agree with predicted values. It also shows the bionic method is feasible and valid for blades designing.