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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。
A numerical study on the infrared suppression technology of the center cone of the engine is carried out. The film cooling technology is adopted on the center cone, and the influence of the arrangement of different film holes on the cooling and infrared suppression characteristics is compared. External cold air flow is introduced into the central cone through the support plate to form an air film covering at the front of the cone so as to effectively cool the support plate and the central cone wall. The results showed that the wall temperature of the nozzle cavity decreased significantly after the film was cooled, and the temperature of the center cone and the support wall decreased by 13.5% and 14.6% respectively. The infrared radiation in the 3 ~ 5 m band was effectively suppressed, the maximum decrease of 41% behind the nozzle and the infrared radiation characteristics in the range of 0 ~ 30 were significantly suppressed.