Hypersonic wind tunnel drop-model test on cover ejection from cargo projectile at large angle of attack
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摘要: 在高超声速风洞中开展了投放模型试验，对在高超声速（Ma=5)及母弹处于大迎角（25°)状态下，子母弹壳片抛射过程的分离特性进行了研究，观察到了壳片从母弹的分离过程，对处于母弹迎风面壳片和处于母弹背风面壳片的运动轨迹，以及x向、y向位移和总位移随时间的变化规律进行了分析和对比。研究发现，迎风面和背风面壳片运动轨迹截然不同，但壳片的运动轨迹发展根据其运动特点均可分为2个阶段。迎风面和背风面壳片x方向的位移运动均可明显地分为位移缓慢变化和位移迅速增大2个阶段，而y向位移均无明显的阶段变化，但迎风面壳片y向运动速度总体上大于背风面壳片。迎风面和背风面壳片的总位移曲线也可明显地分为总位移较缓慢变化（总速度较为恒定)和迅速变化2个阶段。Abstract: Hypersonic wind tunnel drop-model tests were conducted at Mach 5 to investigate the separation characteristics of cover ejection from cargo projectile at large angle of attack(25°). In the test, the whole separation process was observed. The motion trajectory and displacement curves of the covers in the separation process are analyzed. The comparison of the separation characteristics is made between the covers on the windward side and the leeward side. The motion trajectory of the covers is quite different between the windward side and the leeward side, but both motion trajectories of the covers on the two sides can be divided into two stages. For the covers on the windward side, the displacement of y orientation is dominant at stage Ⅰ, while x orientation becomes dominant at stage Ⅱ. For the covers on the leeward side, the displacements are approximately equivalent for x and y orientation at stage Ⅰ, while x orientation becomes dominant at stage Ⅱ.The x orientation displacements for covers on both sides can be evidently divided into two stages. At stage Ⅰ, the displacements change slowly, while those increase rapidly at stage Ⅱ. The y orientation displacements for covers on both sides have no obvious stage transition, but the y orientation velocity on the windward side is larger than that on the leeward side. Similar to x orientation displacements, the total displacements for covers on both sides can also be divided into two stages, and they also change slowly at stage Ⅰ, and then increase rapidly at stage Ⅱ.
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图 3 壳片分离前母弹模型上头激波状态
Figure 3. The shock on cargo projectile model before cover separation
图 4 壳片分离试验典型状态图片序列
Figure 4. Typical sequence of cover separation state in wind tunnel
图 6 壳片分离过程x向位移-时间曲线
Figure 6. Displacement-time curves in x-direction of covers separation
图 7 壳片分离过程y向位移-时间曲线
Figure 7. Displacement-time curves in y-direction of covers separation
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