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Aerodynamic design is one of the key elements in Formula SAE (FSAE) car design, which not only has a decisive impact on the car's handling performance but also affects the cooling performance of the radiator. In this paper, the method of Computation Fluid Dynamics (CFD) is adopted to carry out the analysis and optimization of aerodynamic performance and heat dissipation performance of FSAE racing car considering the characteristics of the rear compartment structure. By analyzing the trend of changes in heat dissipation performance and aerodynamic performance, four representative schemes were selected for comparison. The results indicate a strong positive correlation between the optimized local aerodynamic performance and heat dissipation performance. After optimization, the average volume temperature of the radiator decreased by 29.82%, and the negative lift of the wing increased by 26.92%. This study provides new ideas for the CFD simulation of the full-car model of FSAE race cars, and also provides guidance for the layout design of the cooling device for open-wheel race cars with the radiator placed at the rear.
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空气动力学设计是大学生方程式赛车(FSAE)设计关键环节之一,它不仅对赛车的操纵性能具有决定性的作用,同时也影响了散热器的冷却性能。采用计算流体力学(CFD)的方法,开展了考虑后舱结构特征的FSAE赛车气动性能和散热性能的分析与优化,通过散热性能与气动性能变化趋势筛选出4种具有代表性的方案进行对比分析,结果表明,本次优化的局部气动性能与散热性能呈现出较强的正相关,优化后散热器平均体积温度降低了29.82%,梁翼的负升力增加了26.92%。为FSAE赛车的CFD仿真提供了新的思路,同时也为散热器尾置的开轮式赛车散热装置的布置设计提供了参考。
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赖晨光(1978-),男,江西广昌人,博士,教授,主要研究方向为汽车空气动力学。 E-mail:chenguanglai@cqut.com
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赛车道路试验的梁翼下表面视角, figureFileSmall=Lz5/8qteSZQ264Q2cnZQSw==, figureFileBig=vuVyvzDNyZQk8rpa+/Uexw==, tableContent=null), ArticleFig(id=1175522891035722508, tenantId=1146029695717560320, journalId=1152916057816748034, articleId=1172525474073953045, language=EN, label=null, caption=null, figureFileSmall=djQ1Hm3pFYF6Rt3d+7iLQg==, figureFileBig=w4DhXT1AUFFN+DL6knAU/w==, tableContent=null), ArticleFig(id=1175522891094442765, tenantId=1146029695717560320, journalId=1152916057816748034, articleId=1172525474073953045, language=CN, label=图13, caption=
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赛车中截面速度云图和温度云图, figureFileSmall=TrBLs9HqOmv96ATzeV4V0A==, figureFileBig=JTZc1Fn3yWVKpi7WDBcHNw==, tableContent=null), ArticleFig(id=1175522891715199766, tenantId=1146029695717560320, journalId=1152916057816748034, articleId=1172525474073953045, language=EN, label=null, caption=null, figureFileSmall=/tClWhyUOeA3AmOic43TDw==, figureFileBig=mk7MQaqeTHKnOibsfKQmrA==, tableContent=null), ArticleFig(id=1175522891769725719, tenantId=1146029695717560320, journalId=1152916057816748034, articleId=1172525474073953045, language=CN, label=图18, caption=
赛车中截面散热装置区域压力系数云图和梁翼表面压力系数云图, figureFileSmall=/tClWhyUOeA3AmOic43TDw==, figureFileBig=mk7MQaqeTHKnOibsfKQmrA==, tableContent=null), ArticleFig(id=1175522891824251672, tenantId=1146029695717560320, journalId=1152916057816748034, articleId=1172525474073953045, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 | 值 |
| 扇叶攻角/(°) | 26 |
| 展长/mm | 60 |
| 风扇转速/(r/min) | 3 800 |
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风扇参数
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| 参数 | 值 |
| 扇叶攻角/(°) | 26 |
| 展长/mm | 60 |
| 风扇转速/(r/min) | 3 800 |
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| 类别 | 边界条件 | 设置值 |
| 进口 | 速度进口/(m/s) | 15 |
| 出口 | 压力出口/Pa | 0 |
| 墙壁、地面 | 壁面(滑移) | |
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计算域边界条件
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| 类别 | 边界条件 | 设置值 |
| 进口 | 速度进口/(m/s) | 15 |
| 出口 | 压力出口/Pa | 0 |
| 墙壁、地面 | 壁面(滑移) | |
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| 类别 | 边界条件 |
| 进口 | 停滞进口 |
| 出口 | 压力出口(0 Pa) |
| 风扇 | 壁面、旋转 |
| 涵道 | 壁面(无滑移) |
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散热风扇仿真边界条件
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| 类别 | 边界条件 |
| 进口 | 停滞进口 |
| 出口 | 压力出口(0 Pa) |
| 风扇 | 壁面、旋转 |
| 涵道 | 壁面(无滑移) |
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| 参数 | 值 |
| 多孔惯性阻力/(kg/m4) | 47.5 |
| 多孔黏性阻力/(kg/m3) | 98.2 |
| 多孔介质热功率/W | 34 700 |
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多孔介质阻力参数及热功率
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| 参数 | 值 |
| 多孔惯性阻力/(kg/m4) | 47.5 |
| 多孔黏性阻力/(kg/m3) | 98.2 |
| 多孔介质热功率/W | 34 700 |
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| 模型 | N | N | | /℃ | |
| 简化模型 | 188 | -489 | -2.6 | | 53.3 |
| 后舱模型 | 189 | -426 | -2.2 | 107 | 48.2 |
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简化模型与后舱模型性能参数对比
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| 模型 | N | N | | /℃ | |
| 简化模型 | 188 | -489 | -2.6 | | 53.3 |
| 后舱模型 | 189 | -426 | -2.2 | 107 | 48.2 |
), ArticleFig(id=1175522892453397282, tenantId=1146029695717560320, journalId=1152916057816748034, articleId=1172525474073953045, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 模型 | [, | /℃ | /N | /% |
| Ⅰ(Base) | [90,0] | 104.82 | -17.23 | 48.2 |
| Ⅱ | [110,0] | 98.76 | -17.59 | 48.4 |
| Ⅲ | [110,160] | 73.56 | -21.87 | 51.2 |
| Ⅳ | [110,180] | 75.60 | -17.11 | 49.6 |
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不同变量取值对应的目标值
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| 模型 | [, | /℃ | /N | /% |
| Ⅰ(Base) | [90,0] | 104.82 | -17.23 | 48.2 |
| Ⅱ | [110,0] | 98.76 | -17.59 | 48.4 |
| Ⅲ | [110,160] | 73.56 | -21.87 | 51.2 |
| Ⅳ | [110,180] | 75.60 | -17.11 | 49.6 |
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