浮升混合飞艇气动性能及总体参数分析

为了兼顾飞艇的气动性能和浮升特性,充分发挥二者的优势,并增强可控性,提出了一种基于NACA高升力翼型的组合嚢体式混合飞艇气动布局.采用计算流体力学(CFD)方法建立混合飞艇FLUENT计算模型,数值模拟了它在不同速度和迎角下的升阻特性、纵向静稳定性及浮升特性,并进行了总体性能评估,最后将其与常规飞艇进行了对比.结果表明:该组合嚢体飞艇布局具有较好的气动性能和效率,相同条件下提供的动升力为常规飞艇的3倍;当飞行速度大于26 m/s时,混合飞艇总升力效率开始大于常规飞艇,能够提供更好的浮升特性.此外,相同设计载荷下混合飞艇的外形尺寸更小,有利于增加有效载荷,可为低空大型混合飞艇的研发提供参考.

Aerodynamic and overall parameters analysis of buoyancy-lifting hybrid airship

In order to balance the aerodynamic performance and buoyancy-lifting characteristics of airship, to make full use of their advantages and to strengthen the controllability, a hybrid airship configuration which has combined envelopes that are based on high lift NACA airfoil was proposed. With computational fluid dynamics (CFD) and FLUENT computing modeling, the lift-drag characteristics, longitudinal static stability and buoyancy-lifting property under different velocities and attack angles of the airship were simulated, furthermore, its overall performance was evaluated and lastly it was compared with conventional airship. The results show that the airship configuration with combined envelopes has good aerodynamic performance and efficiency. It can produce three times aerodynamic lift than that of conventional airship under the same condition. When the magnitude of cruise velocity is greater than 26 m/s, hybrid airship begins to have a higher total lift efficiency and better buoyancy-lift property. Besides, the hybrid airship's size is smaller than conventional airship under the same design load, which contributes to increasing payloads. This can provide a reference for low-attitude large hybrid airship's research.