旋转条件下超临界压力正癸烷径向入流时的对流换热

doi:10.13675/j. cnki. tjjs. 180412

推进技术 ›› 2019, Vol. 40 ›› Issue (6): 1332-1340.DOI: 10.13675/j. cnki. tjjs. 180412

旋转条件下超临界压力正癸烷径向入流时的对流换热

芦泽龙,祝银海,郭宇轩

清华大学热能工程系，热科学与动力工程教育部重点实验室，北京 100084

发布日期:2021-08-15
作者简介:芦泽龙，博士，研究领域为旋转条件下超临界压力碳氢燃料对流换热。E-mail: luzl13@mail.tsinghua.edu.cn
基金资助:
国家自然科学基金创新群体项目51621062;教育部联合基金项目2510国家自然科学基金创新群体项目（51621062）；教育部联合基金项目（2510）。

Convective Heat Transfer in Radial Inflow of SupercriticalPressure n-Decane under Rotating Conditions

Department of Thermal Engineering，Key Laboratory for Thermal Science and Power Engineering of Ministry of Education，Tsinghua University，Beijing 100084，China

Published:2021-08-15

摘要/Abstract

摘要： 针对超临界压力流体在发动机涡轮叶片再生冷却技术中的应用，对超临界压力正癸烷在旋转状态下的径向入流管内对流换热和流动进行了研究，分析了哥氏力、浮升力与流动加速对换热的影响规律，提出了适用于旋转条件下超临界压力流体对流换热的同时考虑重力浮升力与旋转浮升力的浮升力无量纲准则数。研究表明：高转速条件下（500r/min以上），浮升力主要由离心力产生且处于强化区，增强对流换热；流动加速主要由压降产生，削弱对流换热；浮升力、流动加速、哥氏力均随转速增大而增大，共同作用下对流换热也随转速增大而增大。1500r/min下平均Nu数约是500r/min的1.5倍，约为静止的2～4倍。

关键词: 超临界压力流体;旋转条件;对流换热;正癸烷

Abstract: Based on the application of supercritical pressure fluid in engine turbine blade regenerative cooling technology，experimental investigation of the convective heat transfer of supercritical pressure n-decane in the radial inlet tube under rotating conditions is presented. The effects of Coriolis force，buoyancy and flow acceleration on heat transfer were analyzed. This paper presents an expression for a dimensionless criterion concerning the buoyancy force generated both by gravity and centrifugal force under rotating conditions. The results showed that under high rotating speed conditions （above 500r/min），the buoyancy was mainly generated by centrifugal force and was in the strengthening zone to enhance convective heat transfer. Flow acceleration was mainly caused by pressure drop，which weakened convective heat transfer. The buoyancy，flow acceleration and Coriolis force increased with the increase of the rotational speed and under their coupling influence，the heat transfer also increased with the increase of the rotational speed. The average Nu number at 1500r/min is about 1.5 times that of 500r/min and about 2 to 4 times of static state.

Key words: Supercritical pressure fluids;Rotation;Convective heat transfer;n-decane

芦泽龙,祝银海,郭宇轩. 旋转条件下超临界压力正癸烷径向入流时的对流换热^{[J]. 推进技术, 2019, 40(6): 1332-1340.}

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旋转条件下超临界压力正癸烷径向入流时的对流换热

Convective Heat Transfer in Radial Inflow of SupercriticalPressure n-Decane under Rotating Conditions

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