摘要
普通禅丸的底阻约占弹丸总阻的1／3。因此，准确测量底阻是准确测定弹丸总阻的关键。在超声速风洞中进行测力实验时，模型底部大都用一根天平支杆将模型支撑在风洞中。由于尾支杆的存在，使得模型底部流动发生畸变，引起底阻测量的不准确性。本文介绍了天平尾支杆以及模型船尾对超声这弹丸底压测量影响的实验研究和理论计算。研究表明：尾支杆直径从小到大变化时，底压经历了一个由大到小再由小到大的过程；在一定的范围内船尾起到提高底压的作用。
The base drag of projectile can amount to as mach as one third of the total drag. Accurately measuring the base drag is the key of total drag measurement of projectile. During testing in supersonic wind tunnel,the model is supported in wind tunnel with a tail sting of balance at the base of model. As a result of the sting,the flow at the base of model distorts and the base-drag of the measurement is inaccurate. This paper presents the effect of tail sting and the angle of boat tail on the base pressure at supersonic velocities. The base pressure changes from large to little, then from little to large when the relative diameter of sting changes from O to 1. The angle of boat tail raises the base pressure when the angle of boat tail is smaller than the critical angle of separation.
出处
《流体力学实验与测量》
CSCD
1997年第4期13-17,共5页
Experiments and Measurements in Fluid Mechanics
基金
气动预研基金
关键词
超声速
弹丸
尾支杆
船尾
底部压力
底阻
supersonics
projectile
tail sting
boat tail
base pressure
