The dynamic ground effect (DGE) refers to the take-off and landing process where the distance between airplane and ground constantly changes with time. In the wind tunnel experiment of DGE, fixed plates are often adopted to substitute the moving-belt ground, which will affect experimental reliability. In this paper, the landing process of an airfoil is simulated to study the feasibility of fixed plates in the chord-dominated DGE experiment. The height is divided into two regions based on the aerodynamics and flow patterns. In Region I (large height), DGE is dominated by the static ground effect (SGE), using a fixed plate can effectively balance the camber effect, blocking effect and boundary layer effect to reproduce result of the moving-ground condition. In Region II (small height), DGE is dominated by the compression work effect, where the downwash is highly compressed to diverge into a forward stream and a backward stream. When using fixed plates, the downwash exhibits two kinds of escaping behavior: the leading-edge-preferred escaping behavior for most fixed plates due to thick boundary layer and the trailing-edge-preferred escaping behavior for the very short plate due to the suddenly weakened camber effect. No plate can balance the two kinds of flow to accurately reproduce pressure distribution on airfoil lower surface and flow physics of moving-ground condition. Thus, the use of a fixed plate is infeasible.

动态地面效应（DGE）是指飞机与地面之间的距离随时间不断变化的起飞和着陆过程。DGE风洞实验中，常采用固定板代替动带式地面，影响实验可靠性。本文通过模拟机翼着陆过程，研究固定板在以弦为主的DGE实验中的可行性。根据空气动力学和流动模式，高度分为两个区域。在I区（大高度），DGE以静态地面效应（SGE）为主，使用固定板可以有效平衡拱度效应、阻挡效应和边界层效应，再现动地条件下的结果。在 II 区（小高度），DGE 受压缩功效应支配，其中下洗液被高度压缩以分流成前向流和后向流。当使用固定板时，下洗流表现出两种逃逸行为：由于厚边界层，大多数固定板的前缘首选逃逸行为和由于突然减弱的非常短的板的后缘首选逃逸行为弧形效果。没有一块板可以平衡这两种流动，以准确再现机翼下表面的压力分布和运动地面条件下的流动物理。因此，使用固定板是不可行的。由于厚边界层，大多数固定板的前缘首选逃逸行为，以及由于突然减弱的弧度效应，非常短的板的后缘首选逃逸行为。没有一块板可以平衡这两种流动，以准确再现机翼下表面的压力分布和运动地面条件下的流动物理。因此，使用固定板是不可行的。由于厚边界层，大多数固定板的前缘首选逃逸行为，以及由于突然减弱的弧度效应，非常短的板的后缘首选逃逸行为。没有一块板可以平衡这两种流动，以准确再现机翼下表面的压力分布和运动地面条件下的流动物理。因此，使用固定板是不可行的。