摘要
为解释低压大直径喷嘴自激脉冲发生机理,本文对空化初生条件进行了讨论,提出一种可适用于高速剪切流的非定常空化模型。认为自激振荡腔内空化或凝结的发生,不仅与当地压力有关,而且与当地速度有关,并根据能量平衡条件,给出了新的空化判别标准。在一定程度上改善了非定常空化模型的收敛性,解决了非定常状态下,由于压力的变化,流体发生周期性相变,即空化和凝结交替发生的数值模拟问题。最后,对低压大直径喷嘴自激脉冲射流进行了数值模拟,并对振荡腔内的压力场、速度场以及相图之间的关系进行了分析。
A cavitation generating condition is discussed for exposing the mechanism of low-pressure large-dia self-excited nozzle. A new cavitation model is proposed which used to simulate the high-shear flow. The point is that the cavitation generating depends on not only the pressure but also the velocity. The new criterion is set according to the condition of energy conversation. By this way, the convergence of numerical simulation of the unsteady flow with the periodical change phase is improved. The results of the cavitation and coagulation appear caused by periodicity-changing pressure in the low-pressure large-dia self-excited nozzle were analysis at last.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2005年第3期438-440,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)
关键词
自激脉冲
射流
空化
凝结
数值模拟
self-excited nozzle
oscillating chamber
cavity
numerical simulation
