首页> 外文会议>American Helicopter Society aeromechanics specialists meeting (Aeromechanics 2000) >TIME-ACCURATE FREE-VORTEX WAKE MODEL FOR DYNAMIC ROTOR RESPONSE
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TIME-ACCURATE FREE-VORTEX WAKE MODEL FOR DYNAMIC ROTOR RESPONSE

机译:动态转子响应的时间精确自由涡流模型

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A time-accurate free-vortex method was developed to accuratelyrnpredict the time evolution of rotor inflow duringrnvarious transient, maneuvering flight conditions. Becausernof the highly non-linear nature of the problem, free-vortexrnwake solutions are often susceptible to numerical instabilities.rnTherefore, the new algorithm was examined for stability,rnaccuracy and convergence. The rotor wake in nearrnhovering flight is known to be inherently unstable and,rntherefore, the stability of the numerical algorithm is thernmost important criteria to ensure convergence. Solutionrnconvergence of the algorithm was demonstrated in steadystaternconditions, with a verified second-order accuracy forrnboth hovering and forward flight. This algorithm was thenrnapplied to help understand the rotor response during a steprnor a ramp increase in collective pitch. A slow build-up ofrninflow (a time lag) was found from the dynamic evolutionrnof the trailed wake structure. The methodology wasrnalso successfully applied to transient axial and inclinedrndescending flight through the highly unsteady vortex ringrnstate.
机译:开发了一种时间精确的自由涡流方法,以准确地预测各种瞬态,机动飞行条件下旋翼流入的时间演变。由于问题的高度非线性性质,自由涡旋苏醒解常易受数值不稳定性的影响。因此,对新算法进行了稳定性,准确性和收敛性检验。众所周知,旋翼飞行中的尾流固有地是不稳定的,因此,数值算法的稳定性是确保收敛的最重要的标准。在稳态条件下证明了该算法的收敛性,并验证了悬停和前向飞行的二阶精度。然后应用该算法来帮助理解转子在阶跃或集体螺距增加中的响应。从尾随尾流结构的动态演化过程中发现了缓慢的积聚(时间滞后)。该方法还成功地应用于通过高度不稳定的涡旋环形状态的瞬时轴向和倾斜下降飞行。

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