基于Flowmaster的多喷嘴引射器建模与仿真

Modeling and Simulation of Multi-nozzle Ejector based on Flowmaster

根据质量守恒、能量守恒和动量守恒建立了多喷嘴引射器的数学模型,并引入动量修正系数和流量系数对其进行修正。在此基础上,以流体系统仿真软件Flowmaster为平台,确定了适用于流体网络法的线性化系数,进而用C#语言首次二次开发了适用于系统级仿真的多喷嘴引射器仿真模型。某型飞机环境控制系统中多喷嘴引射器的仿真和试验结果表明,引射系数随着主、次流压比的增大而减小。主、次流质量流量和引射系数的仿真值与试验值之间的相对误差分别在0.05%～2.74%,2.59%～6.64%和1.20%～7.77%之间,验证了仿真模型的准确性。

A mathematical model of multi-nozzle ejector was established according to the mass conservation, energy conservation and momentum conservation, and a modification was achieved with the introduction of momentum correction coefficient and discharge coefficient. On this basis, linear coefficients used in the fluid network method were determined, then a system-level simulation model of multi-nozzle ejector was first developed with C# language on the fluid system simulation software of Flowmaster. The simulation and experimental results of the multi-nozzle ejector in an aircraft environmental control system shows that the entrainment ratio decreases with the increasing pressure ratio of primary and secondary flow. The relative error between the simulation and experimental values of primary mass flow rate, secondary mass flow rate and entrainment ratio are respectively 0.05%-2.74%、2.59%-6.64% and 1.20%-7.77%, which verifies the accuracy of the simulation model.