摘要：This study presents the overall cooling effectiveness of a nozzle guide vane with impingement-effusion in the conditions of the high temperature and high pressure at the mass flow ratios from KG = 0.09 to KG = 0.14. The temperature ratios change from KT = 1.9 to KT = 2.3 and the proportion of the mass flow rate through the first cavity and the second cavity is from KR = 0.9 to KR = 1.3. The examined gas temperature is raised to guarantee the actual temperature ratio and the matched Biot number with the engine. The local and averaged values of the overall cooling effectiveness on the mid-section profile of the vane are achieved more clearly. The experimental results reveal that the overall cooling effectiveness presents a weak performance on the trailing edge of the vane. The proportion of mass flow rate through two cavities has an obvious influence on the averaged overall cooling effectiveness at relatively low mass flow ratio of KG = 0.09. With the increasing of proportion of mass flow rate at the low mass flow ratio, an enhancement of overall cooling effectiveness in the region of the first cavity is observed. The averaged overall cooling effectiveness is remarkably influenced by the temperature ratio at relatively high mass flow ratio of KG = 0.14. With the increase of the temperature ratio from of KT = 1.9 to KT = 2.3, the averaged overall cooling effectiveness is improved by 7.5% and 6.7% respectively under two conditions of proportion of mass flow rate.
关键词：Nozzle guide vane Overall cooling effectiveness High temperature Temperature ratio Mass flow ratio Proportion of mass flow rate
