通过改变外涵流量, 实验研究了涵道比 0.3和 1时, 相同结构的二元俯仰矢量排气系统几何偏转 0°、10°、20°三种模型下壁面温度与红外辐射特征分布。结果表明: 涵道比 1相对涵道比 0.3时, 排气系统火焰稳定器下游壁面温度具有较大降幅, 隔热屏、收敛段、侧壁、扩张段壁面温度分别降低 170 K、317 K、227 K和 153 K; 涵道比 0.3时, 随着几何偏角增大, 排气系统红外辐射强度增大, 最大增幅 70.2%; 但涵道比 1时, 正好相反, 随着几何偏角增大, 排气系统红外辐射强度下降, 最大降幅 65%。涵道比增大, 排气系统红外辐射特征下降, 几何偏转 0°、10°、20°时, 正尾向分别降低 33.3%、42.1%、60.9%。

By changing bypass mass flow, the wall temperature distribution and infrared radiation characteristics of two dimensional convergent-divergent (2D-CD) vectoring nozzle exhaust system with geometric deflection angles of 0, 10, 20 are numerically studied, at bypass ratio(BPR) 0.3 and 1.0. The results show that the wall temperatures downstream of the flame holder decrease significantly at BPR 1.0, which decrease by 170 K, 317 K, 227 K and 153 K, respectively, at heat shield, convergent section, side wall section and divergent section than those at BPR 0.3; at BPR 0.3, the infrared radiation intensity of exhaust system increases as the geometric deflected angle increases, reaching a maximum amplification of 70.2%, while at BPR 1.0, the infrared intensity behaves in the opposite way, with a maximum drop of 65%; the increase of BPR decreases the infrared radiation of exhaust system, especially in the tail direction where the drop is 33.3%, 42.1% and 60.9%, respectively, at geometric deflection angles of 0°, 10°, 20°.