部分喷嘴关闭对预旋供气系统参数均匀性影响的计算

Numerical simulation of effects of partial nozzle closure on uniformity of parameters in pre-swirl air supply system

为了研究部分喷嘴关闭对预旋供气系统的供气流量和供气温度及其均匀性的影响,采用稳态的固定转子相位法对180°旋转盘腔进行了数值模拟,并通过改变转子相位的稳态计算来近似模拟瞬态问题的时空变化特性。结果表明:在设计点工况(系统压比为1.32,旋转马赫数为0.678)下,喷嘴流通面积关闭14.3%时,引气总流量和供气总流量分别下降10.9%和9.9%。单个供气孔流量的波动幅度由1.1%增大为5.4%。供气的相对总温降低1 K左右,波动幅度由约0.5 K增大为1.5 K。

In order to study the influence of the partial nozzle closure on the air supply mass flow rate,air supply temperature and circumferential uniformity of the air supply parameters of the pre-swirl air supply system,the steady-state method with frozen rotor approach was used to simulate the 180°rotating disk cavity model,and the time-space characteristics of transient problems were approximated by changing the rotor phase in the steady-state calculations.Results showed that:at the design point condition(system pressure ratio of 1.32 and rotating Mach number of 0.678),when the flow area of nozzle was closed by 14.3%,the total bleed air flow and total air supply flow decreased by 10.9%and 9.9%,respectively.The amplitude of fluctuation of the flow rate of a single supply hole increased from 1.1%to 5.4%.The relative total temperature of supply air decreased about 1 K,and the amplitude of fluctuation increased from 0.5 K to 1.5 K.