环形多孔介质再生冷却通道内超临界正癸烷换热数值研究  

Numerical Research on Heat Transfer of Supercritical N-Decane in Annular Porous Media Regenerative Cooling Channels

作　　者：王彦红 李雨健 WANG Yanhong;LI Yujian(School of Energy and Power Engineering,Northeast Electric Power University,Jilin 132012,China)

机构地区：[1]东北电力大学能源与动力工程学院,吉林吉林132012

出　　处：《滨州学院学报》2024年第2期5-12,共8页Journal of Binzhou University

基　　金：吉林省教育厅科技项目(JJKH20220100KJ)。

摘　　要：针对航空发动机再生冷却热防护问题,设计了环形多孔介质通道,探究了多孔介质材料、孔隙率和环形厚度对再生冷却通道内超临界正癸烷换热的影响机制。考察了通道截面流体温度、流线和湍动能的分布情况,通过综合换热系数对流动换热性能进行综合评判,选取最优多孔介质材料为紫铜。考虑孔隙率和环形厚度影响,建立了以紫铜为环形多孔介质材料条件下超临界正癸烷的换热关联式。数值结果表明,环形多孔介质破坏了热边界层,增强了湍流强度,其热弥散效应也起到了良好的强化换热作用。紫铜的孔隙率小、环形厚度大时,通道综合换热性能更好。最佳的孔隙率为0.3~0.5,环形厚度为0.2~0.4 mm。Based on the regenerative cooling thermal protection of aero-engine,an annular porous medium channel is proposed,and the influence mechanism of porous medium material,porosity,and annular thickness on supercritical heat transfer of n-decane in the regenerative cooling channel is studied.The distributions of fluid temperature,streamline and turbulent kinetic energy of channel section are investigated.The flow and heat transfer performances are comprehensively evaluated by the comprehensive heat transfer coefficient,and the optimal porous medium material is selected as copper.Considering the effects of porosity and annular thickness,the heat transfer correlation for supercritical n-decane is established under the condition of using copper as the annular porous medium material.The numerical results show that the annular porous medium destroys the thermal boundary layer,enhances the turbulent flow intensity,and the thermal dispersion effect also plays a good role in enhancing heat transfer.The porous media of copper with small porosity and large annular thickness have better comprehensive heat transfer performance.The optimal porosity is 0.3~0.5 mm,and the annular thickness is 0.2~0.4 mm.

关 键 词：多孔介质 再生冷却 超临界燃料 传热 环形厚度 孔隙率 介质材料 

分 类 号：V235.1[航空宇航科学与技术—航空宇航推进理论与工程]