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在风洞和水洞中分别进行了小振幅振荡三角翼的动态测压和热膜测速实验,目的是研究振荡的无量纲频率n对于三角翼前缘涡的频率特性的影响.对风洞中测得的压力数据进行频谱分析,发现n值在0.018~0.036时,即与三角翼翼面上涡破裂点的振荡频率接近时,会发生耦合现象,使振动能量明显加强;对水洞中测得的速度数据进行频谱分析,则发现n在0.8~1.4的范围内,即与螺旋波的传播频率接近时,三角翼的振荡会使涡破裂点向后缘移动,延缓了涡的破裂,使螺旋波频率增大.
In the wind tunnel and water tunnel, dynamic pressure measurement and thermal film velocimetry experiments were carried out for the small amplitude oscillatory delta wing to study the influence of the non-dimensional frequency n of oscillation on the frequency characteristics of the leading edge vortex. When the value of n is 0.018 ~ 0.036, that is, when the oscillation frequency of the vortex rupture point on the delta wing is close, the coupling phenomenon will occur and the vibration energy will be obviously strengthened. For the measured value of water hole , It is found that when n is in the range of 0.8 to 1.4, that is to say, when the propagation frequency of the helical wave is close to one another, the vibration of the delta wing will move the vortex rupture point to the trailing edge, slowing the vortex rupture, Wave frequency increases.