部件三维仿真模型与发动机循环参数分析的耦合方法研究

In order to integrate the working characteristics obtained from three-dimensional component simulation model into aero-engine cycle parameters analysis and improve the reliability of engine performance estimation，the modified fully coupled approach was proposed. The multi-level variable cycle engine（VCE）simulation model was established using iterative coupled approach and modified fully coupled approach based on three-dimensional core driven fan stage simulation model and zero-dimensional VCE simulation model. Then the effects of calculation method for correction factor and relaxation of boundary parameters on multi-level VCE simulation model were studied and the differences between iterative coupled approach and modified fully approach were compared. The results indicate that the pressure ratio and isentropic efficiency obtained from high-fidelity component simulation model are applied to engine cycle parameter analysis when modified fully coupled approach is employed，and the repeated calls of high-fidelity component simulation model during the linearization process of the nonlinear equations can be avoided. What’s more，the computational process of modified fully coupled approach does not depend on the component default characteristic map. As for iterative coupled approach，there is no obvious difference in convergence rate between the optimization method and normal method which are used to calculate the correction factors. By using optimization method to calculate the correction factors or the relaxation of boundary parameters，the vibration for iterative residual of modified fully coupled approach can be suppressed and the convergence rate can be accelerated. There is no obvious difference between the results of modified fully coupled approach and iterative coupled approach and the convergence rate of the two approaches are the same when the optimization method is used to calculate the correction factors.