高湿环境下盐雾气溶胶混匀装置研究

Study on mixing devices of salt spray aerosol in a high humidity environment

为了提高航空发动机腐蚀敏感性试验考核的一致性,并考虑试验要求盐雾气溶胶粒子的粒径、所处的环境参数以及评价标准的特殊性,进行了高湿环境下的盐雾气溶胶混匀研究。通过对混匀装置的气动设计和结构设计,提出采用多孔注入技术结合扰流元件的混匀装置,其中多孔注入器的结构有效地结合了多点注入和圆柱扰流的作用,实现了初始截面气溶胶浓度的快速均混。采用海洋大气中典型微粒盐雾气溶胶作为粒子源对多孔注入器单体和组合式混匀装置进行混匀性能测试。试验结果表明在典型海洋高湿盐雾环境下,多孔注入器5倍风道等效直径的距离内可以快速实现盐雾含量混匀,截面均匀性满足≤10%;而组合式的混匀装置可以进一步提升了截面属性的均匀性,其中盐雾含量的均匀性4.6%,风速均匀性6.6%,截面温度1.7%。

In order to improve the consistency of aero-engine corrosion sensitivity tests,this paper carries out salt spray mixing researches in a high humidity environment,with a consideration of the particularity of particle size of salt spray aerosol,environmental parameters and evaluation standards.Through its aerodynamic design and structural design,a mixing device using multi-point injection technology combined with spoiler elements is proposed.The structure of the multi-point injector effectively combines the effects of multi-point injection and cylindrical turbulence so as to realize the rapid mixing of aerosol concentration at the initial cross-section.The mixing performance of both single and combined mixing devices of a multi-point injector is tested by using typically particulate salt spray aerosol in the marine atmosphere as the particle source.The test results show that,in the typically marine atmosphere with high humid salt spray,the salt spray content can be quickly mixed within a distance of 5 times the equivalent diameter of the air channel of the multi-point injector,and the cross-section uniformity is≤10%.The combined mixing device can further improve the uniformity of cross-section properties,including 4.6%of the salt spray content,6.6%of the wind speed and 1.7%of the cross-section temperature.