【摘要】 大型艇库会显著改变周围近地面风场环境,在较强来流时,平流层飞艇出库转运过程中,飞艇气动力随出库距离发生显著变化。风洞实验以及理论计算可以得到飞艇在某位置气动力的恒定值,不能得到气动力随出库距离的变化规律。为得到气动力具体变化规律,并为我国艇库及飞艇转运系统建设提供力学输入,以美国Goodyear艇库为例,采用数值仿真方法分析了该艇库周围的风环境及平流层飞艇(HALE-D飞艇)出库转运过程中的气动力变化规律。仿真结果表明,侧风条件下,在平流层飞艇出库转运路线上,局部风加速较为严重,最大风速比达到1.24;飞艇在风加速区域的浮力和侧向力均远高于无艇库绕流状态下的值,最大值比无艇库绕流下的值高61%;阻力在经历该区域时其方向发生改变,离艇库300m左右,飞艇受力基本上脱离了艇库绕流的影响。因此,对飞艇出库过程的气动力分析显得尤为必要。更多还原

【Abstract】 An investigation of wind environment around a huge airship hangar named Goodyear Airdock in Akron America is conducted based on numerical simulation,and its impact on the aerodynamic forces of a stratospheric airship HALE- D is investigated. The simulation result shows that flow field around the hangar changes obviously under the side- wind conditions,and a significant enhancement of wind speed around the hangar is observed and the maximum of the wind speed ratio reaches to 1. 24. When the airship is transported through the wind acceleration region,the buoyancy and lateral force are both increased,and the drag force direction changes and the maximum of the aerodynamic force increases by 61%. When the airship is transported to a distance of about 300 meters from the hangar,the aerodynamic forces will not be influenced by the special air flow field induced by the large airship hangar.更多还原