FLOW AND HEAT TRANSFER MEASUREMENTS ON A ROTATING DISK WITH DISCRETE RECEIVER HOLES
Modern gas turbines are cooled using air diverted from the compressor. In a rotor stator system, the cooling air enters at the center of stator and flows radially outward, then leaves through the discrete receiver holes in the rotor and clearance between rotor and shroud. The rotor with 440mm diameter has 60 blade-cooling holes with 6mm diameter at a radius of 195mm. The temperature distribution is measured by thermocouples on the rotor surface to get the cooling effectiveness. The influence of rotating speed and cooling mass flow rate on cooling effectiveness are analyzed. The existence of receiving holes is of advantage to cooling rotor. The experiments show that the bigger the size of receiving holes is,the higher of cooling effectiveness will be. The average Nusselt numbers on the rotating disc Nuav,d and on the surface of receiving holes Nuav,b are determined by experiment results.The magnitude of them is governed by rotational Reynolds number and nondimensional mass flow rate. The experiments reveal that Nuav,d and Nuav,b are increasing as either of them.
Xiang Luo Guo-qiang Xu Shui-ting Ding Zhi Tao
National Key Lab on Aero-engines, School of Jet Propulsion, Beijing University of Aeronautics and Astronautics
国际会议
昆明
英文
339-345
2006-09-18（万方平台首次上网日期，不代表论文的发表时间）