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采用不同的无黏通量格式与湍流模型组合对轴对称圆截面隔离段进行了数值计算,选取与试验结果最匹配的组合研究隔离段在反压作用下的流场结构及参数特性.对不同反压下的独立隔离段模型和隔离段燃烧室模型进行了三维模拟,分析了隔离段反压比对其流场结构、出口参数及其中激波串形态的影响.针对该轴对称隔离段提出了其可承受的极限反压.比较了冷态均匀反压与燃烧诱导反压下的隔离段流场.结果表明:无黏通量格式与湍流模型的选择影响着激波串的形态和长度,对于隔离段数值模拟十分关键;隔离段出口参数受反压影响,出口处在激波串区域时,附近截面上静压分布的不均匀性较大,出口处在混合区时压力分布则相对更均匀,激波串发展程度影响隔离段出口压力均匀性;对于该圆截面隔离段及燃烧室,直接给定均匀的平面冷态反压所产生的激波串与燃烧反压下的激波串在结构形态和起始位置上未见明显差异.
The combination of different non-stick flux format and turbulence model was used to calculate the axial symmetrical circular cross-section isolation section and the best match of the experimental results was selected to study the flow field structure and parameter characteristics of the isolation section under the action of back pressure. The three-dimensional simulation of the isolated isolation section model and the isolation section combustion chamber model was carried out, and the influence of the back pressure ratio of the isolation section on the flow field structure, exit parameters and the shape of the shock train was analyzed. The results show that the choice of non-stick flux format and turbulence model affects the shape and length of the shock train , It is very important for the numerical simulation of the isolation section. The outlet parameters of the isolation section are affected by the backpressure. When the outlet is in the shock wave region, the distribution of the static pressure in the nearby section is not uniform, while the pressure distribution in the outlet section is relatively More uniform, the impact of the development of the shock wave series affect the pressure uniformity at the exit of the isolation section. For the isolated section of the circular section and the combustion chamber, the shock wave and combustion Depressed shock train no significant difference in morphology and initial position.