核心机驱动风扇级二维仿真模型与变循环发动机零维仿真模型耦合方法的研究

In order to improve the reliability and accuracy of the zero-dimensional variable cycle engine (VCE) model, the two-dimensional model of core driven fan stage (CDFS) was built and integrated into zero-dimensional VCE model with fully coupled approach and the multi-level VCE model was established finally. The differences of results between the zero-dimensional VCE model and multi-level VCE model were analyzed, and the effects of radial non-uniform distribution of aerodynamic parameters of CDFS on VCE performance was studied with the multi-level model. The result indicates that the iterative variables and balance equations need to be adjusted on the basis of the boundary conditions of two-dimensional CDFS model so as to establish the multi-level VCE model with fully coupled approach. Compared with the zero-dimensional CDFS model, the two-dimensional CDFS model containing the physical information such as geometric parameters can provide more practical and physical CDFS characteristics for VCE cycle analysis. The change of CDFS performance will lead to the change of working points of other components and VCE performance with constraint of the flow continuity and power balance. The maximum difference of thrust between the zero-dimensional VCE model and multi-level VCE model is 2. 99%. Combining with CDFS bypass ratio, the radial non-uniform distribution of aerodynamic parameters of CDFS outlet can be integrated into VCE cycle analysis. More reasonable initial values for iterative variables are needed to solve the multi-level VCE model. Therefore, the result of the zero-dimensional VCE model is used to initialize the iterative variables of multi-level VCE model.