基于热阻模型的城市轨道交通铝合金车辆围护结构传热系数计算方法
王云霄1王婧2谭文才1
Calculation Method for Heat Transfer Coefficient of Urban Rail Transit Aluminum-alloy Vehicle Enclosure Structure Based on Thermal Resistance Model
WANG Yunxiao1WANG Jing2TAN Wencai1
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作者信息:1.中车长春轨道客车股份有限公司，130062，长春
2.吉林省林业重点工程资金管理中心,130022,长春
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Affiliation:1.CRRC Changchun Railway Vehicles Co., Ltd., 130062, Changchun, China
2.Fund Management Centre of Major Forestry Project, Jinlin Province, 130022, Changchun, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.08.043
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中图分类号/CLCN:U270.2
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栏目/Col:研究报告
摘要:
［目的］根据城市轨道交通铝合金车辆围护结构的特点，研究一种基于热阻模型的K值计算方法，以此提高计算准确度和效率。［方法］将围护结构分为三个层级，根据热阻串并联关系建立了围护结构的热阻模型。位于第三层级的串联热阻，除包括对流热阻、车体热阻和隔热材料热阻外，还包括将传热路径上所有其他热阻等效替代的“简化热阻”。通过理论计算和试验标定的方法确定上述四个热阻后，即可通过热阻串并联关系计算出围护结构的总热阻，进而计算出K值。［结果及结论］与试验结果对比后发现，该方法的计算结果相对偏差在7%以内。由于目前K值试验数据较少，因此需要持续积累数据并标定该热阻模型，以此达到不断提高K值计算准确度的目标。基于该方法还开发出了应用程序，提高了计算效率。
Abstracts:
［Objective］ According to the characteristics of urban rail transit aluminum-alloy vehicle enclosure structure，a K-value calculation method based on thermal resistance model is studied, thereby improving calculation accuracy and efficiency. ［Method］ The above enclosure structure is divided into three tiers, with an enclosure structure thermal resistance model established according to the series and parallel relationships of thermal resistances. The series thermal resistance in the third tier includes convective resistance, carbody resistance, and insulation material resistance, as well as a ′simplified resistance′ that can equivalently replace all other thermal resistances along the heat transfer path. By determining the four aforementioned thermal resistances through theoretical calculations and experimental calibration, the total thermal resistance of the enclosure structure can be calculated using the series and parallel relationships of thermal resistances, and subsequently deriving the K-value. ［Result & Conclusion］ When compared with experimental results, the calculation accuracy of this method is found to be within 7%. Due to the currently limited availability of K-value experimental data, it is necessary to continually accumulate data and calibrate this thermal resistance model to continuously enhance the accuracy of K-value calculations. An application based on this method is also developed to improve calculation efficiency.
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