lift-drag ratio

Blended-Wing-Body ( BWB) aircraft is a tailless large transport with high lift-drag ratio, and the aerodynamic study for BWB aircraft is a basis of overcoming the technology challenges about it. Firstly, research history on BWB configuration is presented in this paper;

翼身融合飞机（Blended Wing Body Aircraft-BWB Aircraft）是一种新型高升阻比无尾布局的大型运输机，其气动特性的研究是BWB布局飞机克服众多技术难题的基础。

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Compared with models with simple Gurney flap, the models with the lower surface curvature modified have bigger lift-drag ratio, and it increases approximately by 14%.

而与单纯加装Gurney襟翼的模型相比，修改下表面后缘曲率的模型的升阻比可提高14%左右。

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The result shows that the joined-wing aircraft has high lift-drag ratio and specific stability and controllability.

研究结果表明,盒式布局飞机具有良好的升阻特性和特殊的纵向操稳特性.

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The homotopy map for maximum range problem is built by using homotopy method with a large scope convergence property, and the control law of maximum lift-drag ratio is deduced.

首先利用同伦方法的大范围收敛特性，构造原最大射程问题的同伦映射，推导了最大升阻比控制规律，以最大升阻比弹道作为初始解轨迹。

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