The Investigation On Heat Transfer Characteristics Of The Longitudinal Ripple Heat Shield Channel In Afterburner

The investigations on heat transfer characteristics of the three types of longitudinal ripple heat-shielding channels are presented. In the study, the correlations of heating transfer characteristics of longitudinal ripple heat-shielding channels are obtained. The local Nu numbers are calculated by local flow parameter along flow direction. The mean Nu numbers are got by local Nu numbers. The Re numbers are obtained from mean values of inlet Re numbers.The wall temperatures of longitudinal ripple heat shield are calculated in this paper. The correlations of heat transfer characteristics of the longitudinal ripple heat-shielding channels are used to compute the wall temperature. The film cooling holes are treated as slots with the same areas. Single variable-high quality equations about wall temperature are got from energy equilibrium equation. The iterative method is adopted to compute wall temperature. The gas temperatures in afterburner are assumed in linear law and sine law according to x direction separately. The cooling air temperature in the longitudinal ripple heat-shielding channel and heat transfer rate are also calculated.Meanwhile, the software FLUENT was used for computing the distribution of flow, temperature and pressure and so on. In computation, all initial parameters are the same as those which were measured in experiments. Finally, the computational values are got and be used to instruct experiments.