进气畸变对涡扇发动机稳定性及性能影响

为评估进气畸变对涡扇发动机稳定性和性能的影响,发展了一种二维的计算方法,采用非定常、二维、无黏的积分型欧拉方程,沿发动机轴向、周向划分计算单元,通过时间推进法进行求解.某双轴混排涡扇发动机的分析结果表明:该方法可以获得进气畸变在发动机流道中的传递曲线,评估风扇、高压压气机等部件对畸变的衰减作用；通过对工作包线上典型工况点的分析,可判断各点抗总压、总温畸变的能力,确定受畸变影响较大的危险点；在给定的稳态总压畸变条件下,发动机推力下降、耗油率上升,其最大变化值为10.5％和11.7％.

Inlet distortion's effects on stability and performance of turbofan engine

For assessing the inlet distortion's effects on the stability and performance of turbofan engine,a two-dimensional method was developed.The unsteady two-dimensional inviscid integral Euler's equations were used;units were divided along the axial and circumferential directions and solved by time-matching.Simulations of a two spool mixed flow turbofan engine show that this method would obtain the distortion transfer curves along the flow path,which can assess the attenuation of components such as fan or high pressure compressor for distortion.Capabilities to resist the total pressure and total temperature distortion were analyzed for typical operating points in the flight envelope,and the most dangerous point was confirmed;under the given total pressure distortion condition, the turbofan engine's thrust decreases and the specific oil consumption increases, and the maximum amounts of change are 10.5% and 11.7% respectively.