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在低速风洞中对小尺度沟槽表面阻力进行了测量,风洞压力梯度控制为零。比较了不同沟槽面表面阻力随主流速度分布的详细信息。分析得出:沟槽无量纲槽间距与表面阻力的变化有着密切的关系;减(增)阻量的大小与沟槽面的几何形状有关,且具有尖锐槽峰的沟槽面,在一定的流动条件下获得了不同的减阻效果。
The surface resistance of small-scale grooves was measured in low-speed wind tunnel, and the pressure gradient of wind tunnel was controlled to zero. The detailed information about the surface resistance of different grooved surfaces with the distribution of the main velocity is compared. It is concluded that the dimensionless groove spacing of the groove is closely related to the change of the surface resistance. The size of the reducing (increasing) resistance is related to the geometry of the groove face, and the groove face with the sharp groove peak is constant. Different drag reduction effects were obtained under flow conditions.