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首页> 外文期刊>Experiments in Fluids: Experimental Methods and Their Applications to Fluid Flow >Velocity field measurements in the wake of a propeller model
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Velocity field measurements in the wake of a propeller model

机译：螺旋桨模型后的速度场测量

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Turboprop configurations are being revisited for the modern-day regional transport aircrafts for their fuel efficiency. The use of laminar flow wings is an effort in this direction. One way to further improve their efficiency is by optimizing the flow over the wing in the propeller wake. Previous studies have focused on improving the gross aerodynamic characteristics of the wing. It is known that the propeller slipstream causes early transition of the boundary layer on the wing. However, an optimized design of the propeller and wing combination could delay this transition and decrease the skin friction drag. Such a wing design would require the detailed knowledge of the development of the slipstream in isolated conditions. There are very few studies in the literature addressing the requirements of transport aircraft having six-bladed propeller and cruising at a high propeller advance ratio. Low-speed wind tunnel experiments have been conducted on a powered propeller model in isolated conditions, measuring the velocity field in the vertical plane behind the propeller using two-component hot-wire anemometry. The data obtained clearly resolved the mean velocity, the turbulence, the ensemble phase averages and the structure and development of the tip vortex. The turbulence in the slipstream showed that transition could be close to the leading edge of the wing, making it a fine case for optimization. The development of the wake with distance shows some interesting flow features, and the data are valuable for flow computation and optimization.
机译：涡轮螺旋桨飞机的配置正因其燃油效率而被重新考虑用于现代支线运输飞机。在这个方向上使用层流翼是一种努力。进一步提高其效率的一种方法是优化螺旋桨尾流中机翼上的流量。先前的研究集中在改善机翼的总体空气动力特性上。众所周知，螺旋桨滑流会导致机翼边界层的早期过渡。但是，螺旋桨和机翼组合的优化设计可以延迟这种过渡并减少蒙皮摩擦阻力。这样的机翼设计将需要详细了解在孤立条件下滑流的发展。在文献中，很少有研究针对具有六叶螺旋桨并以高螺旋桨前进比巡航的运输飞机的要求。在隔离条件下对动力螺旋桨模型进行了低速风洞实验，使用两分量热线风速仪测量了螺旋桨后面垂直平面中的速度场。所获得的数据清楚地解决了平均速度，湍流，整体相平均以及尖端涡旋的结构和发展。滑流中的湍流表明过渡可能接近机翼的前缘，这使其成为优化的理想情况。随距离变化的尾流的发展显示出一些有趣的流动特征，这些数据对于流动计算和优化是有价值的。

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