典型车-桥系统气动力的雷诺数效应

Reynolds Number Effect on Aerodynamic Force of Typical Vehicle-bridge System

既有高铁动车组愈加流线的外形可能会使列车气动力的雷诺数效应进一步加剧,因此有必要在大雷诺数范围内对车-桥系统气动力的雷诺数效应进行系统研究。风洞试验采用测压形式对简支梁单桥、列车和典型车桥组合等工况的气动力的雷诺数效应进行了研究,同时考虑风攻角对气动力雷诺数效应的影响,并分析迎风侧与背风侧各工况下列车气动力的雷诺效应。试验结果表明:典型桥梁工况气动力在试验雷诺数范围内的变化较小,仅个别攻角下气动力降低;工况3发现列车与桥梁气动力在不同风攻角下随雷诺数变化一致,列车在试验雷诺数范围内阻力均随雷诺数的增加而降低,升力增大,桥梁由于列车的干扰存在对雷诺数变得十分敏感;迎风侧列车的气动力对雷诺数的敏感程度高于背风侧工况。

The increasingly streamlined shape of the high-speed train is likely to further aggravate the Reynolds number effect of the train’s aerodynamic force.Therefore,it is necessary to systematically study the Reynolds number effect of the aerodynamics of the vehicle-bridge system in the range of large Reynolds number.The wind tunnel test adopted the method of pressure measurement to study the Reynolds number effect of the aerodynamic force of the single bridge,train and typical vehicle-bridge combination conditions.Upon the consideration of the influence of the wind attack angle on the aerodynamic Reynolds number effect,the Reynolds effect of the train’s aerodynamic force on the windward side and the leeward side was analyzed.The results of the experiment show that the aerodynamic forces of the typical bridge have a minor change in the range of test Reynolds number unless in some special wind attack angles that reduce the aerodynamic force.In case 3,it is found that the aerodynamic forces of the train and the bridge are consistent with the Reynolds number under different wind attack angles.The resistance of the train decreases with the increase of the Reynolds number,and the lift increases,and the bridge is very sensitive to the Reynolds number because of the interference of the train;The aerodynamic force on the windward side is more sensitive to the Reynolds number than the leeward side.