论文部分内容阅读
在KD－03低速风洞中研制了一种边界层可人为控制的均匀抽吸地板。研究了在各种来流速度下均匀抽吸地板上边界层与抽吸系数的关系。在该地板上对高速列车模型气动力与地板边界层的关系进行了实验研究。对实验的几种模型状态，边界层吸除使列车模型所受阻力、负向升力和低头力矩均有明显增加，其增量与模型底部形状有关；在有侧滑角时，边界层吸除对模型气动力的六个分量均有影响。在没有边界层控制的固定地板上进行高速列车模型风洞实验，会使实验结果固边界层的影响而产生较大偏差。利用均匀抽吸地板可有效地消除边界层的影响，从而较准确地模拟地面效应的影响，提高高速列车模型风洞实验气动载荷的实验精度。而且，它的实验结果可为没有地板边界层控制装置的风洞中同类模型实验的边界层修正提供参考依据。
In the KD-03 low speed wind tunnel, a uniform suction floor with artificially controlled boundary layer was developed. The relationship between the suctioning coefficient and the boundary layer on the floor was uniformly suctioned at various flow velocities. The relationship between aerodynamics and floor boundary layer of high-speed train model was experimentally studied on the floor. For several experimental states, the suction of the boundary layer obviously increases the resistance, negative lift and bowing moment of the train model, and its increment is related to the shape of the bottom of the model. When there is a side slip angle, the suction of the boundary layer All of the six components of the aerodynamic force of the model are affected. The wind tunnel experiment of high-speed train model on the fixed floor without boundary layer control will make the experimental results affect the boundary layer to produce a large deviation. The uniform suction of the floor can effectively eliminate the influence of the boundary layer, so as to accurately simulate the effect of the ground effect and improve the experimental aerodynamic performance of the high-speed train model wind tunnel experiment. Moreover, its experimental results can provide a reference for the boundary layer correction of similar model experiments in the wind tunnel without the control device of the floor boundary layer.