advance ratios 前进比(3)   前进比      The wake geometry of coaxial rotor and single rotor in hover and in level flight was investigated in the course of water tunnel experiment , and the wake boundary of a coaxial rotor for different advance ratios were investigated as an emphasis .      通过对单旋翼和共轴式双旋翼在水洞中的对比实验 ,研究了在悬停和以不同速度前飞时 ,共轴式双旋翼和单旋翼尾迹形态的共性与区别 ,着重研究了在不同前进比时共轴式双旋翼尾迹边界的形态。 短句来源      Based on the previous computation for a rotor flow field in forward flight near ground, the thrust coefficient, torque coefficient and blade flapping angles are calculated and analysed against the advance ratios and flight heights.      基于对旋翼近地飞行时流场的N－S方程计算，计算并讨论了近地飞行时，旋翼拉力、扭矩系数及桨叶挥舞角随前进比、离地高度的变化情况。 短句来源      By the analytical method, the unsteady and steady pressure distribution on the fuselage surface, and the unsteady lift and pitching moment of the fuselage in a rotor interaction environment were calculated for different advance ratios.      应用该计算方法 ,分别计算了旋翼干扰状态下的机身表面点的非定常压强分布和机身的非定常气动升力、俯仰力矩随前进比的变化 ,以及干扰前后的机身定常压强分布。 短句来源   “advance ratios”译为未确定词的双语例句      The disturbance of wake with the ground and the phenomenon of the ground vortex are investigated for several advance ratios and flight heights.      进而，研究了旋翼近地飞行时，在不同前进比及不同离地高度情况下，尾迹与地面的干扰问题及地面涡的现象 短句来源      As examples, the calculations on free wake of UH 1 and H 34 rotors are performed for different advance ratios, and the feature of highly distorted free wake shapes and the strong tendency toward a rapid wake roll up for low speed case are exhibited.      为表明方法的有效性，分别以UH－1和H－34两种直升机旋翼为算例，计算了不同前飞状态的自由尾迹形状，展示出小速度时尾迹畸变和叶尖涡卷绕的重要特征。 短句来源   相似匹配句对      Advance of IHPTET      IHPTET计划的最新进展 短句来源      ADVANCE IN NANOPLASTICS      纳米塑料研究进展 短句来源      Cr ratios and NAA?      Cr和NAA? 短句来源 查询“advance ratios”译词为用户自定义的双语例句     我想查看译文中含有：的双语例句 为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法，我们为您准备了出自英文原文的大量英语例句，供您参考。   advance ratios In phase pressure measurements were performed at four radial and eight longitudinal positions downstream the propeller model at different advance ratios. 例句来源       The influence of propeller loading conditions on the wake structure was also investigated by measuring the velocity fields at three advance ratios (J=0.59, 0.72 and 0.88). 例句来源       Vibration reduction in the presence of dynamic stall, at high advance ratios, is considered first. 例句来源       The thrust and torque are both reduced at higher advance ratios because the average effective angle of attack is also reduced. 例句来源       It was found that standard wind tunnel wall corrections gave satisfactory agreement in advance ratios above 0.10. 例句来源                The calculations of propeller performance at different advance ratios have been eompleted with the free wake analysis method.The wake is divided into near and far regions.In the case of heavy load when the advance ratio of propeller is small,the contraction of wake has large effect on the performance of the propeller.The free wake analysis method takes the wake contraction into account.According to lifting lines for the blad...             采用自由尾涡分析方法，把螺旋桨的尾涡模型分为近涡区和远涡区两部分，计算了在不同进距比情况下的螺旋桨性能。在小进距比的重载情况，螺旋桨尾涡的收缩对螺旋桨的性能影响较大。根据升力线理论采用自由尾涡分析方法考虑尾涡收缩，改进了小进距比情况下的计算结果，使得在所有情况下螺旋桨性能的计算结果和实验结果符合很好。 文摘来源          A finite volume method is used to solve the 3 D Navier Stokes equations to imitate the flow field and performance characteristics of a rotor in a forward flight near the ground. The rotor is modeled as a distribution of momentum sources, the strengths of which are determined from an iterative manner of calculating the local flow field properties, the rotor geometry and the aerodynamic characteristics of the blade cross section. The disturbance of wake with the ground and the phenomenon of the ground...             用有限体积法、三维Ｎ－Ｓ方程对旋翼近地飞行时的尾迹及地面涡进行了数值模拟。由分布在特定区域内的动量源项模拟旋翼对流场的作用，动量源项的强度由旋翼的几何尺寸、叶片剖面的空气动力特性及当地流场的性质迭代定出。进而，研究了旋翼近地飞行时，在不同前进比及不同离地高度情况下，尾迹与地面的干扰问题及地面涡的现象 文摘来源          Based on the previous computation for a rotor flow field in forward flight near ground, the thrust coefficient, torque coefficient and blade flapping angles are calculated and analysed against the advance ratios and flight heights. The results show that the ground effects play a very important role in the thrust coefficient and blade lateral tilt angle.             基于对旋翼近地飞行时流场的Ｎ－Ｓ方程计算，计算并讨论了近地飞行时，旋翼拉力、扭矩系数及桨叶挥舞角随前进比、离地高度的变化情况。结果表明，在地面涡出现的飞行条件下，与无地面效应的情形相比，旋翼拉力和侧倾角有显著变化。 文摘来源   << 更多相关文摘         相关查询: advance ratios (advance) female ratios sr ratios material ratios recent advance advance remittance spark advance technical advance monthly advance advance control  对查询结果不满意

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