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其次研究了这种变化对空中攻击精度的影响。Secondly, the precision influence of missile air attack on downwash flow is discussed.

最后，计算结果展示了旋翼下洗速度在火箭轨道上的分布，并作了简要分析。Finally the rotor downwash velocity distribution along rocket trajectory is found with brief analysis.

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悬停时，下洗尾流使机身产生负升力、俯仰力矩和偏航力矩。The normal force, pitching and yawing moments on the fuselage in hover result from the rotor downwash.

粉尘影响驾车时的某些表面，转子影响直升机和垂直起降飞机。Dust effects when driving over certain surfaces, rotor downwash effects for helicopters and VTOL aircraft.

探讨了直升机旋翼下洗流的形成、分布和影响。The forming, the distribution and the influence of the downwash flow on helicopter main rotor are discussed.

这种诱导速度构成了所谓的下洗气流，而且它使机翼产生的总升力减小。This induced component of velocity is called downwash , and it reduces the amount of lift produced by the wing.

首先应用自由尾流分析技术来计算旋翼尾迹和发动机绕排流空间的洗流速度。First, free wake analysis was carried out to calculate the rotor wake geometry and the downwash around the engine jet space.

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前置倾斜棒控制方法的机理可以用“下洗”和“空腔”两种不同的物理模式来解释。Thereare two control mechanisms, which are "downwash mode" and "cavity mode", for the prepositive inclined rod control method.

试验结果表明排气塔后部的尾流区能引起速度亏损、湍流增强和下冼现象。Experiment results show that wake region behind wind tower can cause velocity deficit, turbulence excess and downwash phenomenon.

结果表明，旋翼与机身之间的气动力干扰，主要是旋翼下洗尾流对机身气动力的影响。The results show that the main aerodynamic effect between the rotor and fuselage is that of the rotor downwash on the fuselage aerodynamic loads.

通过考察旋翼洗流对发动机喷流的影响来研究直升机发动机喷流的流动形式。An analytical method to predict the effects of rotor downwash on engine jet was proposed to investigate the flow pattern of helicopter engine jet.

之后，作为本方法的工程应用，文中给出了计算的旋翼沿火箭发射线的下洗速度分布并作了简单分析。Finally, as an example of its engineering application, the calculated downwash velocity field along the rocket launch line is presented and simply analysed.

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这个巨大的空间里还有其他一些设备，可以模拟救援直升机的下旋气流，也能制造降雨、黑暗、时速120英里的大风，以及烟和火。Other equipment in the cavernous space can replicate the downwash from rescue helicopters, and generate rain, darkness, 120-mile-per-hour winds, smoke and fire.

问题是，偶们想用直升机来进行救援，但是所谓的气流下洗，直升飞机下面的湍流使偶们根本无法从上面接近。Problem was we wanted to save them with a helicopter, but the so-called downwash , the turbulence under the helicopter made it impossible to get close from above.

问题是，我们想用直升机来进行救援，但是所谓的气流下洗，直升飞机下面的湍流使我们根本无法从上面接近。Problem was we wanted to save them with a helicopter, but the so-called downwash , the turbulence under the helicopter made it impossible to get close from above.

利用地面模拟试验件实验研究了直升机旋翼下洗气流对红外抑制器气动及红外隐身性能的影响。Experimental diagnostic study has been performed, and results show that the downwash flow had remark able impacts on the aerodynamic performances, characteristic temperatures, and infrared radiation.

旋翼尾流的作用通过自由尾流分析来求解局部的诱导下洗速度以修正翼型攻角。Rotor wake effects are modeled in the form of a correction applied to the angle of attack along the blades. This correction is obtained by computing the local induced downwash with free wake analysis.