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本文研究中采用加置局部柱形扰源的方法,改变流场中的时均速度分布和紊流度分布,从而达到抑制分离,改善扩压器出口流场的目的。研究表明,局部柱形扰源可明显地延迟流场分离的形成,其主要机理在于近壁部分时均气流动量的变化。文中也介绍了紊流场的测定结果,并对附着流和分离流情况以及有无扰源条件下的紊流分布进行了分析讨论。
In this study, we applied the method of adding local columnar sources to change the time-averaged velocity distribution and the turbulence distribution in the flow field, so as to achieve the goal of restraining the separation and improving the flow field at the diffuser exit. The results show that the local columnar source can obviously delay the formation of the flow field separation. The main mechanism lies in the change of the mean gas flow at the near wall. The results of the turbulent flow field are also introduced in this paper. The turbulent distribution of the adhering flow and the separated flow as well as the turbulent flow with and without disturbance are analyzed and discussed.