摘要
使用无旋特征线法和拟抛物线公式对某地面启动喷管进行了设计,考虑了4种常用的钟型喷管型面,即最大推力喷管、最优抛物线喷管、截短理想喷管、压缩截短理想喷管。通过使用自编高效欧拉方程耦合附面层修正喷管流场求解器求解流场,得到喷管在绝热条件下的真空比冲、出口壁面压力等关键信息,然后使用FLUENT软件计算喷管的流动分离状态,进而比较了这4类常用的钟型喷管的性能和低空使用边界。结果表明,4类喷管在该设计条件下性能差距很小,但是抛物线喷管和压缩截短理想喷管均可通过调整型面来提高喷管出口壁面压力从而扩大喷管的可用面积比进而提高比冲。
A ground starting nozzle was designed by using the non-rotation characteristic line method and quasi-parabolic formula.Four common bell-shaped nozzles were considered,namely,maximum thrust nozzle,optimal parabolic nozzle,truncated ideal nozzle and compressed truncated ideal nozzle.By using a self-designed and efficient Euler equation coupled boundary layer modified nozzle flow field solver to solve the flow field,the key information of nozzle under the adiabatic condition such as vacuum specific impulse and outlet wall pressure were obtained.Then,the flow separation state of nozzle was calculated by FLUENT software,and the performance and low altitude operating boundary of these four commonly used bell nozzles were compared.The results show that the performance difference of the four types of nozzles is very small under the design condition,but both parabolic nozzle and compressed truncated ideal nozzle can improve the outlet wall pressure by adjusting the shape surface,thereby enlarging the available area ratio of nozzle and improving the specific impulse.
作者
刘阳旻
田原
马志瑜
杜宁
丁煜朔
LIU Yangmin;TIAN Yuan;MA Zhiyu;DU Ning;DING Yushuo(Beijing Aerospace Propulsion Institute,Beijing 100076,China)
出处
《火箭推进》
CAS
2023年第5期81-90,共10页
Journal of Rocket Propulsion
基金
中国航天科技集团有限公司自主研发项目(010003000100050038)。
关键词
钟型喷管
性能分析
流动分离
数值仿真
bell nozzle
performance analysis
flow separation
numerical simulation
