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采用数学方法对影响收扩喷管流量系数和推力系数的因素进行了定量分析,将特定结构参数的收扩喷管流量系数转化为喷管喉道直径D8的函数,将推力系数转换为喷管喉道面积A8和喷管面积比Ar的函数,并通过数值模拟对流量系数和推力系数函数的准确性进行了校验。研究结果表明:这2个函数可以较好地反映流量系数和推力系数的变化趋势,通过对其求解可以快速得到收扩喷管在某一状态的性能参数。利用公式得到可调收扩喷管推力系数最大点出现在略欠膨胀的工作状态。
Mathematical methods were used to quantitatively analyze the factors influencing the flow coefficient and thrust coefficient of the nozzle and nozzle. The flow coefficient of the nozzle with specific structure parameters was transformed into the function of the nozzle throat diameter D8, and the thrust coefficient was converted into the nozzle Throat area A8 and nozzle area ratio Ar, and the accuracy of flow coefficient and thrust coefficient function were verified by numerical simulation. The results show that these two functions can well reflect the trend of the flow coefficient and the thrust coefficient. By solving this function, the performance parameters of the nozzle in a certain state can be quickly obtained. The maximum point of the thrust coefficient of the adjustable nozzle is obtained by using the formula, which appears in the condition of slight expansion.