带旋转孔容腔瞬态演化与建模方法研究

旋转孔与腔组成的孔腔系统为航空发动机空气系统的重要组成部分,其瞬态响应过程可能诱发短时危险过渡态载荷。为研究旋转孔腔的瞬态演化规律,以旋转孔前的容腔为研究重点,建立了带旋转孔的容腔CFD计算模型,分析了孔腔系统的瞬态演化过程,并基于旋转孔的稳态流动特性建立了带旋转孔容腔的瞬态1-D模型,对瞬态演化过程进行了仿真。通过对比瞬态1-D模型的结果和CFD结果,发现采用前者能基本模拟容腔的瞬态演化过程,基本满足工程需要,并完成了瞬态1-D模型结果产生偏差的原因分析。

Research on transient evolvement and modeling method of cavity with rotating orifices

Rotating orifices and cavity are important parts of the air system of gas turbine engine,and their transient response might induce dangerous instantaneous transient load.To investigate the transient evolvement of the cavity with rotating orifices,a CFD model of the cavity with rotating orifices was built to research the cavity in front of the rotating orifices.Based on the steady flow characteristic of the rotating orifices,a transient one-dimensional model was built to simulate the transient process.The comparison of the results between the one-dimensional model and the CFD model shows that the former can conduct the transient process simulation satisfactorily and satisfy the elementary engineering needs.Finally,the analysis of the reason for the result errors of one-dimensional model is presented in this paper.