通道截面形状对碳氢燃料流量分配的影响

The effect of cooling channel cross sectional shape on the flow distribution of hydrocarbon fuel in SCRamjet was researched. Parallelogram shape cooling channel was taken as an example to compare with rectangular channel. 3-D modelling of the flow and heat transfer of hydrocarbon fuel in multiple cooling channels under supercritical pressure was done. Under different channel aspect ratios, the parallelogram channel was better both in flow distribution and cooling effect because of the larger heat exchange area. The maximum heated wall temperature fell 226K at most. Then the angle of the parallelogram channel was also important. Larger angle design led to larger heat exchange area and improved the flow distribution and cooling effect. The maximum heated wall temperature fell 287K when the channel angle increased from 105° to 150°. The effect of practical headers was also taken into consideration. The parallelogram channel design was validated under the joint influence of U-type headers and non-uniform thermal boundary condition, showing good application value. The results of this work offer possible solution to the cooling channel design of SCRamjet.