合成射流对高超声速进气道起动特性影响数值模拟研究

Numerical study on starting characteristics of hypersonic inlet with synthetic jet

通过数值模拟研究合成射流作用于高超声速进气道内部流场,分析其对进气道起动性能的影响及进气道工作过程中对合成射流激励器本身的影响。结果表明:合成射流能够改善进气道的起动性能,其控制机理是合成射流阻碍内压缩段后部与隔离段前部两处分离边界层的连合,无法快速形成大的分离泡进而改善进气道起动性能;进气道工作过程中压力变化剧烈导致合成射流激励器膜片单向受载过大是激励器实际应用于超声速/高超声速流动控制急需解决的问题。

Synthetic jet is a new active control technology, and it is light, small, without additional gas source, etc. In this paper, the analyses are conducted by numerical simulation on the effect of starting performance about a synthetic jet actuator acting on a hypersonic inlet and the working process of the inlet acting on the synthetic jet actuator. The results show that the synthetic jet can improve the starting performance. This improvement is achieved by the synthetic jet with the suppression of the combination of the separating boundary layer of isolator and the separating boundary layer of inner compression section, resulting in that a large separation zone cannot be rapidly formed and an improved starting performance of the inlet. The significant changes in the pressure of the inlet during the operation lead to a large load on one side of the synthetic jet actuator diaphragm. This is an urgent problem of the technology on the flow-control to actually apply on supersonic/hypersonic actuators.