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Simulation of Flowfield Around a Ram-Air Personnel Parachute Canopy

机译：空中人员降落伞机盖周围流场的模拟

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摘要

The flowfield around a model MC-4 ram-air personnel parachute canopy was examined using the steady, incompressible Navier-Stokes equations together with the one-equation Spalart-Allmaras turbulence model. A finite volume flow solver was used to compute the flowfield, forces, and moments on the canopy in steady glide and at sideslip. The canopy surfaces were assumed to be impermeable and rigid. The oncoming flow barely penetrates the canopy opening, and creates a large separation bubble below the lower lip of each half-cell. The flow does not reattach, and a thick boundary layer is present on the lower surface of the canopy. The flow over the upper surface of the canopy remains attached until the separation point near the trailing edge. The lift increases linearly with the angle of attack up to about 12 deg, whereas the quarter-chord pitching moment decreases nearly linearly between 2 and 12 deg angle of attack. For sideslip angles up to 20 deg, the side force increases linearly with the sideslip angle even as the lift remains nearly constant. The yawing moment also increases linearly with the sideslip angle, whereas the rolling moment varies quadratically. The fidelity of the lifting-line theory in predicting the forces on the canopy during steady glide was assessed.
机译：使用稳定的，不可压缩的Navier-Stokes方程以及一方程式Spalart-Allmaras湍流模型，对MC-4冲压空气人员降落伞机盖周围的流场进行了检查。有限体积流量求解器用于计算稳定滑行和侧滑时机盖上的流场，力和力矩。顶篷表面被认为是不可渗透的和刚性的。迎面而来的水流几乎无法穿透冠层开口，并在每个半格的下唇下方形成一个较大的分离气泡。流动没有重新附着，并且在冠层的下表面上存在厚的边界层。顶篷上表面上的流保持附着状态，直到后缘附近的分离点为止。升力随着迎角达到大约12度而线性增加，而四分之一弦俯仰力矩在迎角2到12度之间几乎呈线性减小。对于最大20度的侧滑角，即使升程保持几乎恒定，侧向力也会随着侧滑角线性增加。偏航力矩也随侧滑角线性增加，而侧倾力矩呈二次方变化。评估了在预测直线滑行过程中顶篷上的作用力时，举升线理论的保真度。

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  • 来源
    《Journal of Aircraft》 |2013年第5期|1628-1636|共9页
  • 作者

    A. Eslambolchi; H. Johari;

  • 作者单位

    Mechanical Engineering Department, 18111 Nordhoff Street. California State University, Northridge, California 91330;

    Mechanical Engineering Department, 18111 Nordhoff Street. California State University, Northridge, California 91330;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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