基于动网格技术的双定子马达配流结构优化

为消除双定子叶片马达的配流冲击所产生的不利影响，对双定子马达的配流结构进行改进，即开设闭死压缩角与闭死膨胀角，有效实现预升压和预卸压。推导了双定子马达的闭死角数学模型，并对预升压与预卸压过程中闭死容腔内的压力变化特性进行了分析，基于动网格及其UDF（用户自定义函数）编程技术对双定子马达进行三维数值模拟计算。结果表明，与现有双定子马达相比，开设闭死角可以有效地减轻双定子马达的高压回流冲击以及压力突变的现象，使过渡区中油液压力的变化趋于平缓。

Optimization of Flow Distribution Structure of Double-stator Motor Based on Dynamic Grid Technology

Double stator multi speed hydraulic motor is a novel hydraulic component based on international patent technology. There are four motors in one shell for a double acting double stator multi motor, each of these sub motors can work alone or be combined depending on the actual requirement. The structure of so called multi motor is different from the common ones, there is one rotor corresponding to two stators in a shell, which can achieve the constant displacement motor output with multi torques. It has the advantages of small size, light weight, simple structure, and high efficiency in specific power and can output several different flow rates. The double stator hydraulic motor can work in differential connections, which expand the range of applications and improve the adaptability for the multi motors. As the distance between the inner and outer stator is equal, no returning springs or such mechanisms are required. In order to eliminate the adverse effects caused by the impact of flow distribution of double stator vane motor, the valve structure of double stator motor was improved, that was to open closed die compression angle and closed die expansion angle, which effectively achieved pre boost and pre pressure relief. The mathematical model of the closed dead angle of the double stator motor was derived, and the characteristics of pressure change in the closed die cavity were analyzed. Based on dynamic mesh and its user defined function (UDF) programming technology, the three dimensional numerical simulation of the two stator motor was performed. The results showed that compared with the existing double stator motor, open closed angle can effectively reduce the phenomenon of high pressure backflow and abrupt pressure change, and made the change of oil pressure in transition zone tended to be more gentle, which laid the theoretical foundation for the reasonable design of double stator components in the future.