Control of pseudo-shock oscillation in scramjet inlet-isolator using periodical excitation
| Autor: | Yun Chen, Piao-Ping Tang, Wei-Yi Su, Feng-Rui Zhang |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Shock wave
020301 aerospace & aeronautics geography geography.geographical_feature_category Materials science business.industry Oscillation Back pressure Isolator Aerospace Engineering 02 engineering and technology Mechanics Unstart Inlet 01 natural sciences 010305 fluids & plasmas Flow control (fluid) 0203 mechanical engineering 0103 physical sciences Scramjet Aerospace engineering business |
| Zdroj: | Acta Astronautica. 143:147-154 |
| ISSN: | 0094-5765 |
| DOI: | 10.1016/j.actaastro.2017.10.040 |
| Popis: | To suppress the pressure oscillation, stabilize the shock train in the scramjet isolator and delay the hypersonic inlet unstart, flow control using periodic excitation was investigated with unsteady Reynolds averaged Navier-Stokes simulations. The results showed that by injecting air to manipulate the cowl reflected shock wave, the separation bubble induced by it was diminished and the pressure oscillations of the shock train were markedly suppressed. The power spectral density and standard deviation of wall pressure were significantly reduced. The simulations revealed that this active control method can raise the critical back pressure by 17.5% compared with the baseline, which would successfully delay the hypersonic inlet unstarts. The results demonstrated that this active control method is effective in suppressing pressure oscillation and delaying hypersonic inlet unstarts. |
| Databáze: | OpenAIRE |
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