摘要
高压大流量推力室氢头腔的优化设计对氢喷嘴流量均匀性和氧喷嘴声学错频具有非常重要的意义。通过对传统平顶式推力室氢头腔内的流场和氧喷嘴声学特性进行的数值计算、与不同倾斜角度的阶梯式氢头腔进行对比分析,结果表明,平顶式氢头腔导致边区氢流量小于设计值,造成边区高混合比,而阶梯式氢头腔有效地提高了氢喷嘴流量的均匀性,使各圈氧喷嘴纵向声学频率不一致、能量分散,实现氧喷嘴和燃烧室的声学错频,从而大大降低喷注耦合声学不稳定发生的可能性,为大推力氢氧发动机高压大流量氢头腔结构的合理设计提供依据。
Optimization design for high-pressure and large-flow hydrogen cavity has very important effect on the flow field uniformity of hydrogen injector and the acoustics frequency staggering of oxygen injector. The flow field and acoustics characteristics of oxygen injector inside a traditional flattop hydrogen cavity are simulated using CFD code, whose result is compared with the stepped hydrogen cavity. The comparison shows that flattop cavity results that margin hydrogen flow is less than design, leading to the high mixing ration at the margin; stepped cavity improves the flow uniformity of hydrogen injector, achieving the acoustics frequency staggering of oxygen injector and chamber. The research results can provide some basis for the rational design of hydrogen cavity of high-pressure and large-flow thrust chamber.
出处
《导弹与航天运载技术》
北大核心
2014年第1期21-24,共4页
Missiles and Space Vehicles
基金
国家863高科技基金(2007AA702)
关键词
推力室
阶梯式氢头腔
流场均匀性
声学错频
Thrust chamber
Stepped hydrogen cavity
Flow field uniformity
Acoustics frequency staggering
