紧凑喷射下钝体回流区内当量比影响因素数值研究

摘要

针对先进加力燃烧室火焰稳定器采用的紧凑喷射模式，以包含一个钝体稳定器的矩形模型件为研究对象，数值研究了加力条件下来流温度和速度以及喷口直径、喷射距离、钝体宽度对钝体稳定器后回流区局部当量比的影响。结果表明：提高来流温度、速度，扩大喷口直径，增加喷射距离或槽宽，都会增大钝体回流区内的当量比。最后，利用获得的数据建立了简单拟合函数，以预估紧凑喷射模式下回流区内的局部当量比。%Aiming at the close-couple injection utilized by flame holders in advanced augmenters, a rectan⁃gle model including the bluff body was researched. The effects of incoming flow temperature, velocity, injec⁃tor diameter, injection orifices of the trailing edge and bluff body width on the local equivalence ratio in RZ (recirculation zone) were investigated. Numerical simulation indicates that the value of local equivalence ra⁃tio in RZ gets larger by increasing incoming flow temperature, velocity, injector diameter or bluff body width. The obtained data was used to develop a transfer function to predict the local equivalence ratio in the RZ based on the parameters.