Investigation On Flow And Heat Transfer Characteristics Of Effusion Cooling Configuration

This research is based on gas turbine combustor liners cooling technology as the background.the method of experimental and numerical is used to study the flow and heat transfer characteristics offull-coverage film cooling configuration,Analysis and comparison on the different aerodynamicparameters and geometric parameters，no rib cross flow model, ribbed cross flow model,no ribimpingement model three kinds of typical structure divergent hole surrounding area flow and heat transferof the law. Through the experiment and numerical simulation results，In this paper the research within therange of parameters，draw the following conclusion:(1)For different model, cross flow Reynolds Number and outflow ratio has a great influence onnusselt number. on The same wall area, nusselt number with cross flow Reynolds number and the flowratio increases. divergent hole area enhancement ratio with the flow ratio increases bigger and with crossflow Reynolds number is decreased. cross flow Reynolds Number and outflow ratio has a great influenceon divergent hole discharge coefficient. With the increase of the cross flow Reynolds number dischargecoefficient also shows the trend of increase gradually. specifically, discharge coefficient with the increaseof the ratio of the flow increases. When the flow ratio after more than5,the trend of increase is notobvious. model direction ratio has little performance impact on it.(2)For different model, With the increase of impingement Re, the average nusselt number alsogradually increase and change obviously. With the flow ratio the average nussle number basicallyunchanged. In three different impingement and divergent hole cross range direction ratio, direction ratio inheat transfer effect is not obvious. Longitudinal direction ratio is smaller, the greater average nusselt. norib impingement average nusselt is much bigger than no rib cross flow.(3)For ribbed cross flow model, in the divergent hole area, average nusselt number and dischargecoefficient has a same Change rules with no rib cross flow.