摘要
本文揭示了自激脉冲喷嘴产生自激振荡的根本原因。由于腔内产生了低于汽化压力的负压,引起低压区液体的汽化,加上射流不稳定剪切层的作用,最终形成大小周期性变化的轴对称空化气囊;对脉冲喷嘴腔内流场进行了二维非定常数值模拟,通过对腔内压力和流场的分析,验证了上述结论;试验研究通过对腔内压力的数据采集及对脉冲现象的同步观察,进一步说明了本文结论的正确性。
The mechanism of the self-excited nozzle is proposed. When the negative pressure of the self-excited pulse jet's chamber is around vaporization pressure, the local cavity would happen with the effect of the unsteady shear layer. Then the periodical changing axisymmetric cavity loop would form at last. The 2D unsteady simulation of the nozzle chamber has been done and the analyses prove the early results. The collection of the chamber pressure sample and the synchronized observation of the experiment phenomena is also approve the prediction.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2004年第2期241-243,共3页
Journal of Engineering Thermophysics
基金
浙江省自然科学基金重大资助项目(No.2E0208)
