超临界压力碳氢燃料在增材制造通道中流动传热的实验研究  

Experimental study on flow and heat transfer of hydrocarbon fuels in additive manufacturing channels at supercritical pressure

作　　者：蔡磊 肖颖 韩怀志 于瑞天 罗文 CAI Lei;XIAO Ying;HAN Huaizhi;YU Ruitian;LUO Wen(School of Chemical Engineering,Sichuan University,Chengdu 610065,China;AECC Sichuan Gas Turbine Establishment,Mianyang 621022,China)

机构地区：[1]四川大学化学工程学院,成都610065 [2]中国航发四川燃气涡轮研究院燃烧试验研究部,绵阳621022

出　　处：《北京航空航天大学学报》2025年第3期881-891,共11页Journal of Beijing University of Aeronautics and Astronautics

基　　金：国家自然科学基金(T2441001);四川省燃气轮机燃烧工程技术研究中心专项基金(JMRH-0000-2024-00001)。

摘　　要：针对超临界压力正癸烷在增材制造(AM)粗糙通道与机械加工光滑通道中的流动和传热性能差异进行对比实验研究。采用粗糙度仪获得AM通道和光滑通道的表面平均粗糙度分别为11μm和3μm。考察不同系统压力(3 MPa、5 MPa和7 MPa)和壁面热流密度(0.29 MW/m^(2)、0.32 MW/m^(2)和0.35 MW/m^(2))工况下,2种通道摩阻系数f和努塞尔特数Nu在不同流量下的变化规律。结果表明:在选定的流量范围内,AM通道的f和Nu皆大于光滑通道,AM通道的f是光滑通道的2.8~3.5倍,Nu是光滑通道的1.7~2.3倍;增大系统压力会使AM通道的f降低,但却使光滑通道增加,而Nu在AM和光滑通道皆降低;随着壁面热流密度增加,AM通道的f和Nu皆降低,而光滑通道皆增加;粗糙通道具有很好的综合传热性能,并且在小流量时效果更好,其综合传热系数为1.2~1.5;提出超临界碳氢燃料在增材制造通道中Nu和f的关联式。This article presents a comparative experimental study on the flow and heat transfer performance differences between additive manufacturing(AM)rough channels and machined smooth channels for supercritical pressure n-decane.Using a roughness gauge,the surface average roughness of the smooth channel and AM channel were determined to be 3μm and 11μm,respectively.The study investigated variations in the friction factor(f)and Nusselt number(Nu)of the two channels under different flow rates,system pressures(3 MPa,5 MPa,and 7 MPa),and wall heat flux densities(0.29 MW/m^(2),0.32 MW/m^(2),and 0.35 MW/m^(2)).The results showed that,within the selected flow rate range,both f and Nu of the AM channel were higher than those of the smooth channel,with f being 2.8~3.5 times that of the smooth channel,and Nu being 1.7~2.3 times that of the smooth channel.Increasing the system pressure reduced f of the AM channel,but increased that of the smooth channel,while Nu decreased for both channels.As the wall heat flux density increased,both f and Nu of the AM channel decreased,while those of the smooth channel increased.The rough channel had a comprehensive heat transfer coefficient of 1.2~1.5,showing outstanding overall heat transfer performance and greater effectiveness at low flow rate.The correlations of the Nu and f of supercritical hydrocarbon fuel in additive manufacturing channel are proposed.

关 键 词：粗糙度 增材制造 流动阻力 换热特性 实验研究 

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] TK172[动力工程及工程热物理—热能工程]