Heat Transfer Measurements for a Cooled Endwall in Short Duration Transonic Wind Tunnel
The surface heat transfer characteristics of an enlarged endwall with film cooling are studied in short duration wind tunnel. The testing endwall is made of epoxy of low thermal conductivity. The surface heat transfer coefficient and adiabatic cooling effectiveness are derived from the surface temperatures measured by thermocouples based on onedimensional and semi-infinite assumption. The testing inlet Reynolds number (Re), exit isentropic Mach number (Ma), and mass flow rate ratio (MR) are closed to the blades real working state. It is showed that heat transfer coefficient increases with the increasing of Re or MR MR and Ma are the major roles that affect adiabatic cooling effectiveness. At the endwalls rear region near the blade trailing edge, the adiabatic cooling effectiveness increases with increasing Ma or decreasing MR By contrast, at the region near the blade leading edge, the adiabatic cooling effectiveness increases when MR increases, while the effect of Ma is not obvious. The result of numerical calculation is compared to experiment, which shows large deviation in the surface adiabatic temperature.
adiabatic cooling effectiveness Reynolds numbers Mach number mass flow rate ratio short duration wind tunnel
LI Hong-cai ZHU Hui-ren REN Zhan-peng XU Du-chun
School of Power and Energy, Northwestern Poly-technical University, Xian, China
国际会议
4th International Symposium on Jet Propulsion and Power Engineering(第四届喷气推进与动力工程国际会议 ISJPPE2012)
西安
英文
301-307
2012-09-10（万方平台首次上网日期，不代表论文的发表时间）