| 摘要: |
| 为了揭示串连式冲压发动机飞行助推段进气道和补然室内压强振荡产生的机理,针对冲压发动机的助推段开展了进气道和补燃室内流动的大涡模拟,获得了进气道和补然室内压强振荡的频率和振幅,并和飞行实验数据进行了对比。结果表明,在助推段串连式冲压发动机进气道和补燃室内发生的压强振荡现象属于典型的整体模式不稳定现象;助推飞行马赫数、飞行高度的变化对整体模式不稳定现象压强振荡的频率和振幅影响不大。 |
| 关键词: 冲压发动机 压强振荡 整体模式不稳定 大涡模拟 |
| DOI： |
| 分类号:V235.21 |
| 基金项目:国家自然科学基金(10602047) |
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| Numerical simulation of boosting stage pressure oscliiation in ramjet |
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LI Qiang, LIU Pei-jin, LI Jiang, HE Guo-qiang
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Coll.of Astronautics,Northwestern Polytechnical Univ.,Xi’an 710072,China
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| Abstract: |
| Aiming at discovering the mechanism of pressure oscillation in serial layout ramjet inlet and chamber,large eddy simulation was carried out and pressure oscillation frequency and amplitude were obtained.Comparson were made between the experimental and numerical results.It was shown that in boosting stage,the pressure oscillation in the inlet and chamber of serial layout ramjet is the typical bulk mode instability.The flight velocity and altitude have little effect on the oscillation frequency. |
| Key words: Ramjet engine Pressure oscillation Bulk mode instability Large eddy simulation |
