航空发动机整机性能仿真中的功率平衡方法

提出了一种在CFD三维整机仿真中实现功率平衡的计算方法。推导确定了决定平衡关系的关键变量:涡轮前温度与物理转速。提出了基于稳态流场和功率经验关系实现功率平衡的数值迭代方法。本文将该迭代方法与CFD三维求解耦合，发展了一种可用于三维整机CFD耦合仿真的功率平衡计算方法。采用该功率平衡计算方法对MTJ-80涡喷发动机开展了三维整机CFD数值计算，实现了整机性能三维仿真与控制规律的耦合和预测。在控制燃油量不变的条件下，通过转速迭代可以实现压气机和涡轮的功率差小于0.1%，可以预测固定燃油供给量条件下所能达到的稳态运转转速。在控制转速不变的条件下，通过调节燃油量实现压气机和涡轮的功率差小于0.15%，可以预测固定转速条件下的燃油流量。数据验证结果表明:该功率平很给计算方法可以与CFD三维整机计算耦合，并且具有很强的收敛性，解决了以往整机三维性能仿真过程中的功率不平衡问题。 

Power balancing method in aero-engine whole-engine performance simulation

A calculation method of power balance in CFD 3D machine simulation was presented. The key variables determining the equilibrium relationship such as temperature before turbine and physical speed were deduced and determined. The numerical iterative method based on the steady state flow field and power empirical relationship was proposed to realize the power balance. The power balance calculation method was used to carry out the CFD numerical calculation of the MTJ-80 turbojet, and the coupling and prediction of the performance simulation and control law were realized. Under the condition of constant fuel quantity, the power difference between compressor and turbine can be less than 0.1% through speed iteration, and the steady running speed can be predicted under the condition of fixed fuel supply. Under the condition of constant control speed, the power difference between compressor and turbine was less than 0.15% by adjusting the fuel quantity, and the fuel flow rate under the condition of constant control speed can be predicted. The data verification results showed that the proposed method can be coupled with CFD 3D machine calculation with strong convergence, which solved the power imbalance problem in the previous 3D performance simulation of the machine.