复合增程弹头部喷流气动特性实验研究

Experimental Study on Aerodynamic Characteristics of Hybrid Extended Range Projectile With Jet From Its Nose

通过风洞实验研究了头部喷流喷咀布局形式及喷流压力比对复合增程弹气动特性的影响.实验马赫数为2.0、2.5和3.0,迎角为0～6°,喷流压力比为0～180,喷流介质为冷空气,喷咀布局形式包括3种不同的喷咀倾角和4种不同的喷咀数量.实验结果表明,喷流后复合增程弹阻力系数下降（个别工况除外）,升力系数增加,压心明显后移;喷咀倾角及喷咀数量增加,复合增程弹阻力系数均下降,喷咀倾角为30°、喷咀数量为4个时升力系数增加幅度最大、压心后移量最大,而其他喷咀倾角和喷咀数量时升力系数和压心的影响均基本相同;随着喷流压力比增加,复合增程弹阻力系数下降,而升力系数和压心变化不明显.

The influence of layout of nozzle and jet pressure ratio on aerodynamic characteristics of hybrid extended range projectile（HERP）with jet from its nose was researched by the wind tunnel experiment.Experimental Mach number was 2.0,2.5 and 3.0;angle of attack range was from 0 to 6°;jet pressure ratio range was from 0 to 180; media of jet was cool air.Layout of nozzle included 3 types of the inclined angle of nozzle and the number of nozzles.The experimental results show that the drag coefficient decreases （except for individual condition）; the lift coefficient increases;the center of pressure moves downstream markedly.The drag coefficient of HERP decreases as the inclined angle of nozzle and the number of nozzles increases.The increase of the lift coefficient and the downward movement of pressure center are greatest as the inclined angle of nozzle is 30° and the number of nozzles is four.The influence on the lift coefficient and the center of pressure of the inclined angle of nozzle and the number of nozzles is basically the same in other conditions.The drag coefficient decreases,and the change of the lift coefficient and the center of pressure is unmarked with the increase of jet pressure ratio.