超声速气液两相清洗喷头计算

Calculation of supersonic gas-liquid two-phase cleaning nozzle

为了建立高效可靠的喷射设备计算方法,辅助喷射喷头设计,对用于清洗机械零部件表面的某超声速气液两相清洗喷头进行计算,分析了其核心气动结构——Laval喷管中的流动情况。以空气与液相颗粒组成的两相流为研究对象,采用MacCormack预估—校正法在工程求解器EES中编写差分程序进行数值求解。计算了进口总压为0.5~4.5 MPa、液相流量为0.005~0.045 kg/s和液相颗粒直径为10~100μm时喷管中的流动情况。分析了进口总压、液相流量和颗粒直径对两相流动的影响,得出该清洗喷头中流动参数的变化规律、清洗喷头工作压力的调节规律和温度限制。

In order to establish an efficient and reliable injection equipment calculation method and auxiliary spray nozzle design.The supersonic gas-liquid two-phase cleaning nozzle used to clean the surface of mechanical parts was calculated,and the flow in the core aerodynamic structure,Laval nozzle,was analyzed.Taking the two-phase flow composed of air and liquid particles as the research object,the MacCormack prediction-correction method is used to write the differential program in the engineering equation solver EES for numerical solution.The flow in the nozzle was calculated when the total inlet pressure was 0.5~4.5 MPa,the liquid phase flow was 0.005~0.045 kg/s,and the liquid phase particle diameter was 10~100μm.The effects of total inlet pressure,liquid phase flow and particle diameter on the two-phase flow were analyzed.The variation of flow parameters in the cleaning nozzle,the regulation of the working pressure of the cleaning nozzle and the temperature limitation are obtained.