45··基于涂料反射隔热作用的改性安全帽降温性能研究*王云卿1李举鹏1陈明义2冀星光1杨嘉乐1赵嘉暄1陈悦3(1.石家庄铁道大学土木工程学院,河北石家庄050043;2.石家庄铁道大学安全工程与应急管理学院,河北石家庄050043;3.石家庄铁道大学交通运输学院,河北石家庄050043)摘要采用实验室试验和ANSYS数值仿真法开展安全帽降温改性材料最佳配比的实验,并以石家庄季节气候条件模拟分析了季节特征温度和风速对安全帽降温效果的影响。结果表明:①当PET涂料和新型纳米隔热涂料质量比为1∶3时,降温幅度最大,为11.6℃;②普通安全帽与改性安全帽的温度云图均随着远离帽顶区域呈现出“层状分布”的降低趋势,且外界环境温度越高,改性安全帽降温效果越好;③当风速低于5m/s时,改性安全帽降温效果显著,降温1.4~3.2℃;随着风速的增大,太阳辐射吸收率急剧减小,安全帽热传递方式基本只存在与环境的对流换热,2种安全帽的降温效果趋于相同。关键词安全帽反射降温涂料个体防护不安全行为热舒适性Researchonthecoolingperformanceofmodifiedsafetyhelmetsbasedonthereflectiveinsulationeffectofco-atingsWANGYunqing1LIJupeng1CHENMingyi2JIXingguang1YANGJiale1ZHAOJiaxuan1CHENYue3(1.SchoolofCivilEngineering,ShijiazhuangUniversityofRailways,ShijiazhuangHebei050043,China)AbstractLaboratorytestsandANSYSnumericalsimulationwereusedtocarryoutexperimentsontheoptimalratioofsafetyhelmetcoolingmodificationmaterials,andtheinfluenceofseasonalcharacteristictemperatureandwindspeedonthecoolingeffectofsafetyhelmetswassimulatedandanalyzedwithShijiazhuangseasonalclimatecondi-tions.Theresultsshowthat:①WhenthemassratioofPETcoatingandnewnanothermalinsulationcoatingis1∶3,thecoolingrangeisthelargest,11.6℃;②thetemperaturecloudsofbothordinaryandmodifiedhelmetsshowade-creasingtrendof"laminardistribution"withtheareaawayfromthetopofthecap;thehighertheexternalenvironmenttemperatureis,thebetterthetemperaturereductioneffectofmodifiedhelmetsis;whenthewindspeedwashigh,thetemperaturereductioneffectofmodifiedhelmetswasbetter.③whenthewindspeedislowerthan5m/s,themodifiedsafetyhelmetcoolingeffectissignificant,cooling1.4~3.2℃;withtheincreaseofwindspeed,thesolarradiation...