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在使用节段模型的风洞试验中,端板或补偿模型常被用于减小端部效应的影响。为了明确端板、补偿模型对斜拉索节段模型气动特性测试结果的影响,通过刚性模型测力试验的方法,研究了补偿模型安装间距对模型阻力系数的影响;通过刚性模型测力、测压试验的方法,分析了端板尺寸对模型阻力系数、风压系数的影响。研究结果表明:当模型长细比小于18时,补偿模型这种措施不能消除端部效应的影响;端部效应,不仅对端部附近的风压分布有影响,对中间位置的影响也不容忽视;端板尺寸较小时不能保证中间位置的二维流动;随着端板尺寸增大,阻力系数逐渐增大,当端板尺寸大于4倍模型直径后,阻力系数不再明显改变。
In wind tunnel tests using segment models, end plates or compensation models are often used to reduce the effects of end effects. In order to clarify the influence of the end plate and the compensation model on the aerodynamic characteristics of the stay-cable segment model, the influence of the installation distance of the compensation model on the drag coefficient was studied by the rigid model force test method. Pressure test method, the impact of the size of the end plate on the model drag coefficient, wind pressure coefficient. The results show that when the slenderness ratio of the model is less than 18, the compensation model can not eliminate the influence of the end effect. The end effect not only affects the wind pressure distribution near the end but also can not ignore the influence of the middle position ; When the size of the end plate is small, the two-dimensional flow in the middle position can not be guaranteed; as the size of the end plate increases, the drag coefficient gradually increases; when the end plate size is larger than 4 times the model diameter, the drag coefficient no longer changes obviously.