某脉冲发动机传热特性分析

Analysis of Heat Transfer Characteristics of a Pulse Engine

为研究侧喷管脉冲发动机的传热性能,运用流体计算软件对发动机进行流固耦合换热数值计算,分析发动机工作过程中的瞬态换热。数值计算结果与试验结果的一致性较好,验证了数值方法的准确性。研究结果表明:不同材质基座的温度场结构基本一致,由于材料热物性的不同,壁面的温度梯度会存在一定的差异;燃气的涡旋流动是造成内壁面高温及烧蚀主要原因,烧蚀产生的金属氧化物颗粒会加剧燃气的侵蚀效应,铝质基座需具备热防护部件。

In order to study the heat transfer performance of side nozzle pulse engine, the fluid-solid heat transfer numerical calculation of the engine was carried out by using fluid calculation software, and the transient heat transfer during engine operation was analyzed. The numerical results were in good agreement with the experimental results, which verified the accuracy of numerical method. The results showed that temperature field structures with different material base were basically the same, and due to the thermophysieal properties of materials, the temperature gradient of the wall would exist some differences. The vortex flow of gas was the main cause of the high temperature and ablation of the inner wall. The metal oxide particles produced by ablation would intensify the erosion effect of gas, and aluminum base should have thermal protection parts.