层板发汗冷却推力室板片流道的调节功能试验

Experiment study for platelet slab flow channel control performance of platelet transpiration cooled thrust chamber

为了在设计层板发汗冷却推力室时选择合适的一次调节通道 ,对不同曲率半径、不同几何尺寸的一次调节通道进行了流阻试验 ,得出了不同几何尺寸的一次调节通道的流动特性。试验结果与经典的层流理论计算结果之间存在较大的差异。试验表明 ,一次调节通道的临界雷诺数随曲率半径的减小而减小 ,摩阻系数随曲率半径的减小而增加 ,并得出了相应条件下的一次调节通道摩阻系数的修正关系式 。

Some primary metering grooves with different curvature radiuses and geometrical dimensions were designed, and the hydraulic characteristics of them were all tested. Based on the experiment results, different flow characteristics of them were obtained. The great differences between the experimental results and the conventional theoretical predictions were found by the comparison between them. Under the condition of this experiment, the critical Reynolds i 1000-1200, and is diminished as the decrease of the curvature radius of the primary metering groove. The influence of the curvature radius on the friction factor is remarkable, and the value of friction factor is increased with the decrease of the curvature radiuses. The experimental correlative to calculate the friction factors of the primary metering grooves was obtained. The optimal primary metering groove choice was analyzed when designing the platelet transpiration cooling thrust chamber.