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Canard-Elevon Interactions on a Hypersonic Vehicle

机译：超音速飞行器上的Canard-Elevon相互作用

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摘要

Airbreathing hypersonic cruise vehicles are typically characterized by long, slender bodies with highly coupled engines and airframes. For a case in which the engine is underslung (below the center of gravity), a large elevon control surface is typically necessary to trim the vehicle. The elevon is usually placed at the rear of the vehicle to yield a large moment arm. However, the drawback is that the elevons can cause large perturbations in lift and other undesirable effects. Canard control surfaces are placed on the forebody of the vehicle to counteract these effects as well as aid in low-speed handling. This study looks at how the canards affect the flow over the elevon control surfaces and, in turn, the controllability of the vehicle in general. A two-dimensional analytical formulation is developed and compared with both a series approximation solution and a computational fluid dynamics Euler flow field solution. The effect of the canard on the elevon, measured using the elevon effectiveness ratio, decreased as the distance between the control surfaces increased. In general, higher Mach numbers combined with higher canard deflection angles resulted in a greater effect on the elevon. Adding a thickness correction, as opposed to assuming that the airfoils were flat plates, actually decreased, on average, the accuracy of the model when compared with the computational data.
机译：呼吸式高超音速巡航车的典型特征是细长，具有高度耦合的发动机和机身的车身。对于发动机下悬（在重心以下）的情况，通常需要大的电子控制面来调整车辆。 elevon通常放置在车辆的后部，以产生较大的力矩臂。但是，缺点是电子可能引起升力的较大扰动和其他不良影响。鸭绒控制表面放置在车辆的前车身上，以抵消这些影响并有助于低速操纵。这项研究着眼于鸭嘴如何影响流经操纵面的流量，进而影响车辆的总体可控性。开发了二维分析公式，并将其与级数逼近解和计算流体力学欧拉流场解进行了比较。随着控制面之间距离的增加，鸭绒对elevon的影响（使用elevon效率比测量）降低。通常，较高的马赫数和较高的鸭嘴偏转角共同导致对电子的更大影响。与假定翼型是平板相反，增加了厚度校正，实际上与计算数据相比，实际上降低了模型的准确性。

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