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介绍了子弹束后向抛入底部流场的风洞试验：后抛观察试验、测力试验和测压试验．后抛观察试验时子弹束和天平之间用尼龙绳连接，观察子弹束后抛运动过程．测力试验时改用刚性连杆连接，测量子弹束所受的轴向力，通过测压管测量底部流场沿轴线的正、反向压力，试验马赫数为３．５和４．０；攻角为０°．试验表明，作用在后抛子弹束上的气动轴向力指向后方，子弹束在底部流场中加速向后运动．适宜的解捆区域是底面后（１．０～２．０）ＤＢ．
This paper introduces the wind tunnel test after the bullet beam is thrown into the bottom flow field: observation observation, force measurement test and pressure measurement test. After the cast test observed the bullet beam and the balance between the nylon rope connected to observe the bullet beam thrown after the movement process. Force test using rigid connecting rod connection to measure the axial force of the bullet beam measured through the piezometer tube bottom flow along the axis of the positive and negative pressure test Mach number 3.5 and 4.0; Angle of attack is 0 °. The experimental results show that the aerodynamic axial force acting on the post-projectile bundle points backward, and the bullet accelerates backward in the bottom flow field. Suitable unwinding area is behind the bottom (1.0 ~ 2.0) DB.