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对于采用层板发汗冷却的推力室,为了最大限度地减少冷却剂流量,理想情况是,应根据不同轴向位置的受热情况来分配冷却剂流量,以使各处的壁面温度都控制在材料的许用温度内。本文运用有限体积法,对层板发汗冷却推力室内的燃气流动和壁面内的传热进行了数值模拟,同时通过调节冷却剂吹风比,使各处的壁面温度都控制在材料的许用温度之内。为综合考虑发汗冷却效果,将发汗冷却的两个方面,即推力室壁面内的传热和发汗流对传热的阻隔进行了耦合求解。数值研究结果表明:推力室内壁温度越低,所需的冷却剂的吹风比越大。
For thrust chambers cooled by laminates, in order to minimize coolant flow, ideally, the coolant flow should be distributed according to the heating at different axial positions so that the wall temperatures everywhere are controlled at the material Allowable temperature. In this paper, the finite volume method is used to simulate the gas flow and the heat transfer inside the wall in the sweat-cooled thrust chamber. At the same time, by adjusting the blowing ratio of the coolant, the wall temperatures of all places are controlled at the permissible temperature of the material Inside. In order to comprehensively consider the effect of sweat cooling, the two aspects of sweat cooling, that is, the heat transfer and sweat flow in the wall of the thrust chamber, are coupled and solved for the heat transfer. The numerical results show that the lower the temperature of the thrust chamber, the greater the required blowing ratio of the coolant.