论文部分内容阅读
轴流式压气机叶顶泄漏流非定常性对压气机性能和稳定性有着重要影响。为了避开研究转子内部流场所遭遇的测量困难,以及为了可以更加方便地调节叶顶间隙和进气角的需要,本文以压气机平面叶栅作为研究对象,旨在通过对不同间隙,不同马赫数和不同攻角下的叶顶泄漏流的动态测量,了解叶栅环境下叶顶间隙流非定常性的特征和出现条件,探索利用叶栅模拟转子环境进行叶顶间隙流研究的可行性。实验表明,叶顶泄漏流在某些工况下存在非定常性。该非定常性的频率特征受来流速度影响较大。产生非定常性的条件是需要泄漏流轨迹到达相邻叶片的压力面。产生非定常性的主要原因是由于泄漏流与叶片载荷的相互作用。
The unsteady flow at the tip of axial compressor has an important influence on the performance and stability of the compressor. In order to avoid the measurement difficulties encountered when studying the flow field inside the rotor, and in order to more easily adjust the blade tip clearance and intake angle, this paper takes the compressor plane cascade as the research object, The dynamic measurement of tip leakage flow under different angles of attack and number of attack angles is used to understand the characteristics and appearance conditions of unsteady tip-flow in cascade environment. The feasibility of using blade cascade to simulate rotor tip flow is discussed. Experiments show that the tip leakage flow is unsteady in some conditions. The unsteady frequency characteristics are greatly influenced by the velocity of the incoming stream. The unsteady condition is that the flow path of the leak is required to reach the pressure surface of an adjacent blade. The main cause of unsteady flow is due to the interaction of the leakage flow with the blade load.