누설 유동을 고려한 터빈 캐스케이드 장비 설계

Abstract

Leakage flow system integrated turbine cascade experiment facility has been designed to assess the effect of interaction between leakage flow and tip clearance flow on aerodynamic loss. 5 variables, mass flow rate of the leakage, pitchwise velocity of the leakage, boundary layer thickness, tip gap and combination of the leakage location, are controlled independently. A set of leakage flow system is composed of blower, control valve and 2 flow meters. 2 sets of leakage flow system is connected to mainstream and each set introduces leakage flow into mainstream upstream and downstream of the blade. Leakage slot is parallel to blade row. To ensure uniform leakage flow, variable floor which adjusts cross section area of the leakage flow pipe along flow direction. Periodicity error of the mainstream is less than 4%.