| 桥上孔隙式风屏障缩尺模型模拟方法的风洞试验 |
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| 引用本文： | 向活跃,李永乐,胡喆,廖海黎.桥上孔隙式风屏障缩尺模型模拟方法的风洞试验[J].工程力学,2013,30(8):212-216. |
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| 作者姓名： | 向活跃 李永乐 胡喆 廖海黎 |
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| 作者单位： | 1.西南交通大学桥梁工程系，四川，成都 610031； |
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| 基金项目： | 四川省科技支撑计划项目(2011GZ0240)；中央高校基本科研业务费专项资金项目(SWJTU11CX008，SWJTU11CX127)；西南交通大学博士生创新基金项目 |
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| 摘 要： | 为了明确孔隙式风屏障缩尺模型的模拟方法，针对铁路桥上设置透风率为30%、高度为2.05m风屏障情况，通过风洞试验测试了不同开孔形式风屏障作用下车辆的气动力系数，分析了风屏障的孔径和开孔形状对车辆气动特性的影响，讨论了圆孔形风屏障与纵条形风屏障的相似性。结果表明，在1∶20的缩尺模型中，风屏障的孔径可取8mm~12mm；透风率相同时，风屏障的开孔形式对迎风侧车辆有一定的影响；纵条形风屏障的间隙数不低于10个时，与设置8mm圆孔形风屏障时的车辆气动特性较为接近，结果可为风屏障的缩尺模型风洞试验和数值模拟提供参考。
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| 关 键 词： | 风屏障 缩尺模型 风洞试验 开孔形式 车辆气动特性 |
| 收稿时间： | 2013-08-20 |
SIMULATION METHOD OF POROUS WIND SCREEN SCALE MODEL ON BRIDGE BY WIND TUNNEL TESTS |
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| Affiliation: | 1.Department of Bridge Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China; 2. China Railway Siyuan Survey and Design Group Co., Ltd, Wuhan, Hubei 430063, China |
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| Abstract: | In order to investigate the simulation method of a scale model for a porous wind screen, the aerodynamic coefficients of vehicles under the action of a wind screen installed on the railway bridges are measured by wind tunnel tests. The wind screen is 2.05m high, with the porosity of 30%, and with different hole shapes. The effects of hole size and hole shape are analyzed, and the similarity between the wind screen with circular holes and the wind screen with longitudinal bars are discussed. The result shows that the circular hole size of a wind screen at the scale of 1∶20 should be in the range of 8mm to 12mm; the hole shape of a wind screen with the same porosity has some certain effect on the aerodynamic coefficients of the windward vehicle; the longitudinal bar wind screen with more than 10 gaps is equivalent to a wind screen with the circular hole size of 8mm. The results could provide some references for the wind tunnel test and numerical simulation of a wind screen. |
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