考虑丙二醇热解的相变发汗冷却数值研究  

Numerical study on phase change transpiration cooling with pyrolysis of propylene glycol

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作  者:刘逸飞 麻玉龙 贺菲[1] 俞继军[2] 罗晓光[2] 王建华[1] LIU Yifei;MA Yulong;HE Fei;YU Jijun;LUO Xiaoguang;WANG Jianhua(CAS Key Laboratory of Mechanical Behavior and Design of Materials,Department of Thermal Science and Energy Engineering,University of Science and Technology of China,Hefei 230027,China;China Academy of Aerospace Aerodynamics,Beijing 100074,China)

机构地区:[1]中国科学技术大学热科学和能源工程系中国科学院材料力学行为和设计重点实验室,安徽合肥230027 [2]中国航天空气动力技术研究院,北京100074

出  处:《推进技术》2024年第12期237-249,共13页Journal of Propulsion Technology

基  金:国家自然科学基金(52376154,U22B20135);安徽省自然科学基金(2308085J21)。

摘  要:为了揭示裂解反应对相变发汗冷却的影响,本文结合局部热非平衡下的两相混合模型(LTNE-TPMM),过渡态理论(TST)和化学反应动力学,利用丙二醇(PG)作为冷却剂,对多孔平板相变发汗冷却进行了数值研究,首次揭示了不同冷却剂质量流量和热流密度分布下裂解反应对多孔介质内流动换热过程的影响机理和影响规律。结果表明,丙二醇裂解率与注入流量呈现负相关,与热流密度大小呈现正相关,质量流量从0.2 kg(/m^(2)∙s)提高至0.4 kg(/m^(2)∙s)时,丙二醇的裂解率由0.48降低至0.27;热流密度q_(0)从0.8 MW/m^(2)提高到1.2 MW/m^(2)时,裂解率由0.21提高到了0.63。裂解反应从多孔骨架吸收大量热量,增加了额外的化学热沉。此外,裂解反应能够有效强化多孔出口高温区的流动换热,提高热扩散速率。In order to reveal the influence of pyrolysis reaction on phase change transpiration cooling,the phase change transpiration cooling in a porous plate was numerically investigated combining local thermal nonequilibrium two-phase mixing model(LTNE-TPMM)with Transition State Theory(TST)and chemical reaction kinetics theory,using propylene glycol(PG)as coolant.The influence mechanism and pattern of pyrolysis reac⁃tion on the flow,hear transfer and phase change inside the porous media was revealed under different coolant mass flux and heat flux distributions.The results showed that cracking rate of PG is negatively correlated with the injection flow rate and positively correlated with the value of heat flux,when the mass flow rate increases from 0.2 kg(/m^(2)∙s)to 0.4 kg(/m^(2)∙s),the cracking ratio of propylene glycol decreases from 0.48 to 0.27.When the heat flux density q_(0) increased from 0.8 to 1.2 MW/m^(2),the cracking ratio increased from 0.21 to 0.63.The pyroly⁃sis reaction absorbs a large amount of heat from the porous skeleton,providing additional chemical heat sink.In addition,the pyrolysis reaction can effectively improve the thermal convection and thermal diffusion at the porous outlet.

关 键 词:发汗冷却 热防护 相变 多孔介质 丙二醇 裂解反应 热扩散 

分 类 号:V231.1[航空宇航科学与技术—航空宇航推进理论与工程]

 

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