气膜孔布置形式对发动机中心锥冷却与红外抑制特性的影响

Investigation of Effect of Hole Arrangement on Cone Cooling and Infrared Radiation Characteristics

对发动机中心锥的红外抑制技术开展数值研究,在中心锥上采取气膜冷却技术,比较了不同气膜孔布置形式对冷却与红外抑制特征的影响。外涵低温气流通过支板引入中心锥,在锥体前端形成气膜覆盖,使支板与中心锥壁面得到了有效冷却。研究发现,采用气膜冷却后,喷管腔体壁面温度显著降低,中心锥与支板的壁面温度降低13.5%和14.6%。3～5 m波段上红外辐射得到有效抑制,喷管正后方最大降低41%,0～30范围内红外辐射特征得到显著抑制。

Infrared suppress characteristics of the cone of nozzles with different forms of holes, were investigated. In the front of the cone, the holes were decorated by different forms. The temperature of blade and cone walls were effectively decreased by the secondary channel gas which crossed through blades. The radiation of cone in 3-5 μm was inhibited effectively, the maximum of being down is by 41% comparing to the nozzle without cone cooling. Radiation in 0°30° range from behind the nozzle decreased obviously.