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为了研究液氧煤油发动机尾焰冲击导流槽的流场规律,采用CFD软件计算了液氧煤油发动机尾焰对无导流装置、有锲形导流装置和有圆锥体导流装置三种不同导流槽的冲击流场进行了三维数值模拟,对比分析了冲击不同导流槽的尾焰燃气流动。结果表明:液氧煤油发动机尾焰燃气垂直冲击无导流装置的导流槽,沿着导流槽侧面流动和向上反射的燃气会对导流槽底面正上方环境产生高温影响;锲形导流装置能够避免沿着导流槽侧面流动和向上反射的燃气对导流槽底面正上方环境的高温影响;圆锥体导流装置能够避免向上反射的燃气对导流槽底面正上方环境的高温影响,在避免燃气沿着导流槽侧面流动方面仍有改进余地;相对尾焰燃气冲击无导流装置的导流槽,锲形导流装置和圆锥体导流装置表面最大压力分别增大了10.31%和33.81%,锲形导流装置和圆锥体导流装置受尾焰燃气冲击的最高温度分别降低了4.04%和8.95%。
In order to study the flow field of the tail-impingement trough of a liquid oxygen-kerosene engine, CFD software was used to calculate the flow rate of the tail gas of the liquid oxygen-kerosene engine to the non-flow-guiding device, with the wedge-shaped flow guiding device and the conical flow guiding device Three-dimensional numerical simulation of impingement flow field of diversion channel was conducted, and the tail gas flow impacting different diversion channels was contrasted and analyzed. The results show that the tail gas of liquid oxygen and kerosene engine impinges vertically on the guide groove of the non-guide device. The gas flowing along the side of the guide groove and reflecting upwards will have a high temperature influence on the environment directly above the bottom surface of the guide groove. The device can avoid the high temperature influence on the environment right above the bottom surface of the guide channel due to the gas flowing along the sides of the guide channel and reflecting upwards. The cone guide device can avoid the influence of the upwardly reflected gas on the environment immediately above the bottom surface of the guide channel, There is still room for improvement in avoiding the flow of gas along the sides of the diversion channel; the maximum pressure on the surfaces of the wedge-shaped diversion device and the cone diversion device increases by 10.31% And 33.81% respectively. The maximum temperature of wedge-shaped deflector and cone deflector impacted by tail flame gas decreased by 4.04% and 8.95% respectively.