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本文建立了夹套式外冷却燃气发生器燃烧室热防护的CFD数值模拟模型,并用该模型对影响热防护效果的各因素进行了研究。用有限容积法离散二维轴对称N-S方程,用标准k-ε模型模拟湍流,用可压缩耦合求解器求解控制方程。研究了燃烧室内壁材料热导率、燃烧室内壁壁厚以及冷却水流量对热防护效果的影响。结果表明材料热导率对热防护效果的影响较大,高热导率的材料能够明显降低燃烧室内壁壁温和温度梯度;当燃烧室内壁为高热导率材料时,壁厚和冷却水流量对热防护效果的影响相对较小。
In this paper, the CFD numerical simulation model of the thermal protection of the jacket-type external cooling gas generator combustor was established, and the factors affecting the thermal protection effect were studied with this model. The finite-volume method is used to discretize the two-dimensional axisymmetric N-S equation and the standard k-ε model to simulate the turbulent flow. The governing equations are solved using a compressible coupled solver. The influence of the thermal conductivity of the material of the inner wall of the combustion chamber, the thickness of the inner wall of the combustion chamber and the flow of the cooling water on the thermal protection effect was studied. The results show that the material thermal conductivity has a great influence on the thermal protection effect. The material with high thermal conductivity can obviously reduce the mild temperature gradient of the inner wall of the combustion chamber. When the inner wall of the combustion chamber is of high thermal conductivity material, The effect of protection is relatively small.