双螺杆压缩机的计算流体力学3D动态仿真与试验

3D CFD dynamic simulation and experimental research of twin-screw compressor

基于双螺杆压缩机的工作过程为理论循环过程的假设,提出了双螺杆压缩机工作过程的数学模型,将其内部流动分为入口流体、基元容积流体和出口流体3个部分。运用计算流体力学(CFD)理论中的网格界面法和动网格技术实现空气吸入、压缩和排出的周期性变化过程,并通过Fluent对双螺杆压缩机的内部流场特性进行数值模拟。为了验证该数学模型与数值仿真方法的准确性和可行性,搭建了双螺杆压缩机内部压力测试装置,对双螺杆压缩机的p-V变化规律进行试验研究。结果表明,仿真数据与试验数据吻合良好。因此,文中所构数学模型和模拟方法为双螺杆压缩机的设计与研究提供了重要的工具和方法。

A mathematical model of twin-screw compressor working process was proposed in this paper based on the theoretical cycling hypothesis of twin-screw compressor working process. The inside flow was divided into three parts： inlet fluid,primitive volume fluid and outlet fluid. The periodic change process of air suction, compress and exhaust were realized using grid interface method and dynamic grid technology in CFD. In order to verify the accuracy and feasibility of mathematical model and numerical simulation method, an internal pressure test device of twin-screw compressor was established to study the P-V change rule of twin-screw compressor. The Result showed that the simulation data was consistent with the experimental data.Therefore, the mathematical model and the simulation method provided important tools and methods for the design and research of twin-screw compressor.