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基于三维数值模拟,对不同轴对称矢量喷管在多种工作状态下的内外流场进行了研究,分析了扩张角及扩张段长度对喷管有效矢量角的影响.基于最小二乘曲面拟合理论,建立了自变量包括扩张角、扩张段长度/喉道直径、落压比/设计落压比、几何偏转矢量角的多变量轴对称矢量喷管性能预测数学模型,并根据已有实验数据,对该模型进行了验证结果表明:推力系数误差最大为0.41%,流量系数误差最大为1.58%,矢量角误差最大为1.76°.建立的数学模型通用性较强,实现了用统一的模型对不同喷管性能参数进行预测和分析,具有一定的工程意义.
Based on the three-dimensional numerical simulation, the internal and external flow fields of different axisymmetric vector nozzles under various operating conditions were studied, and the influence of the divergence angle and the length of divergent section on the effective vector angle of the nozzle was analyzed.Based on the least square curve Based on the reasonable theory, a multivariable axisymmetric vector nozzle performance prediction mathematical model with independent variable including expansion angle, length of expansion section / throat diameter, ratio of pressure drop / design pressure, geometric deflection vector angle was established. According to the existing experiments The results show that the maximum error of thrust coefficient is 0.41%, the maximum error of flow coefficient is 1.58%, and the maximum error of vector angle is 1.76 °. The established mathematical model is more versatile and achieves a unified model Prediction and analysis of different nozzle performance parameters have certain engineering significance.