基于通流方法的某涡喷发动机整机数值仿真

Based on the axisymmetric method, three-dimensional Euler equations with viscous force are turned into two-dimensional problems. The problems are solved using time-marching method, and the obtained software can be applied to the overall simulation of aircraft engine. By means of this tool, a turbojet engine on design point as well as off-design point is simulated. First, the throttle characteristics on the ground are firstly studied and are compared with the experimental data. The results reveal that the maximum error for thrust is-5.1% and that of specific fuel consumption is +4.8%. The specific fuel consumption is the smallest at 95% rotational speed. Second, altitude characteristic at flighting Mach number 0.7 and velocity characteristic on the height of 3 km are obtained through this method. The comparison between the designed value and the computation results show that, for altitude characteristic, the maximum errors of thrust and specific fuel consumption are-4.61% and +5%. For velocity characteristic, the maximum errors of both parameters are-5.83% and +5.92%. Third, Co-operating line of the engine is acquired through simulations of compressor and turbine individually. At last, flow field and spanwise distribution of aerodynamic parameters of the engine on design point are analyzed.