基于圆柱绕流的容积式机械吸入能力优化设计方法研究  

Research on the optimization design method of suction capacity of volume machinery based on the theory of flow around a cylinder

作　　者：张元勋[1] 刘应波 Zhang Yuanxun;Liu Yingbo(College of Aerospace Engineering,Chongqing University,400044,Chongqing,China;Center of Space Exploration,Ministry of Education,400044,Chongqing,China)

机构地区：[1]重庆大学航空航天学院,重庆400044 [2]教育部深空探测联合研究中心,重庆400044

出　　处：《应用力学学报》2021年第5期1884-1889,共6页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金青年基金项目(51705045)。

摘　　要：针对圆柱绕流的减阻、增速等现象,结合边界层分离理论,提出了一种容积式流体机械进口结构优化设计方法。以提高吸入能力为目的,建立绕流流线优化模型。运用图形和解析相结合的方法,结合容积式流体机械进口结构特性,完成了容积式流体机械进口结构优化,揭示了容积式流体机械进口结构特性与吸入能力的相互影响关系。最后,以螺杆泵为例,求解了优化模型并进行了仿真验证。结果表明:在容积式流体机械进口端面设置合适的流线型体可以增大流体进入泵腔速度,提高螺杆泵吸入能力,螺杆泵吸入能力提高26.46%以上。研究结果可为容积式旋转流体机械向高转速方向发展提供理论参考。For the phenomenon of drag reduction and speed increase of the flow around a cylinder. Combined with the boundary layer separation theory, an optimization design method for the inlet structure of a volumetric fluid machine was proposed. In order to improve the suction capacity of volume fluid machinery, the streamline optimization model of the flow around the cylinder was established. The inlet structure optimization model of the volume fluid machinery was soluted by using the method of the combination of figure and analysis. The optimization of the inlet structure of the volume fluid machinery was completed by combining the characteristics of inlet structure. The relationship between the inlet structure characteristics and the suction capacity of the of volume fluid machinery was revealed. Finally, the twin-screw pump was calculated as an example and the optimization model was solved and verified by simulation. Compared with the theoretical calculation value and the simulation verification value, the results showed that the flow velocity into the pump cavity can be increased and the suction capacity of the screw pump can be increased by more than 26.46% by setting a proper streamline body at the inlet end face of the volume fluid machinery. The research can provide theoretical reference to volume fluid machinery for developing to high speed of revolution.

关 键 词：圆柱绕流 流体机械 吸入能力 边界层分离 螺杆泵 

分 类 号：O351.2[理学—流体力学] TH327[理学—力学]