The pressure measurement of millimeter level plane cascade using pressure sensitive paint
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摘要: 建立了一种新型的非接触式压敏涂料(Pressure Sensitive Paint,PSP)测压系统,设计了一套可拆卸式毫米级平面叶栅实验段,首次应用PSP测压技术测量了有/无叶尖间隙毫米级叶栅叶背表面静压分布.结果表明:由于存在叶尖间隙,叶盆处高压气体通过间隙泄漏流入叶背,使叶背叶尖处压力明显大于叶根处;与无叶尖间隙相比,有间隙时泄漏对叶背表面压力的影响约占叶高1/3,叶背底端受泄漏的影响较小.Abstract: A novel non-contact pressure measurement system of pressure sensitive paint (PSP) was established. One set of test section of millimeter level plane cascade which can be dis-assembled was designed. The surface pressure of blade suction side with and without tip clearance was measured using PSP technology for the first time. The results show that, because of tip clearance, the blade pressure side gas leaks into the suction side through tip clearance and the surface pressure of the top of blade suction side is bigger than it of the bottom. Contrast with the condition of no tip clearance, leakage has significant impact on the pressure on one third of the blade span of suction side, but little on the bottom of suction side.
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