高温/高压条件下复杂微细通道内对流传热强化及局部纵向导热效应研究

项目名称： 高温/高压条件下复杂微细通道内对流传热强化及局部纵向导热效应研究

项目编号： No.51306139

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 能源与动力工程

项目作者： 马挺

作者单位： 西安交通大学

项目金额： 26万元

中文摘要： 高温/高压换热技术是超高温气冷堆、超临界二氧化碳布雷顿循环等高效能源动力系统的关键技术之一，发展高效的高温/高压传热技术是推广这些系统走向实际应用和提升效率的关键所在。为了强化传热，当前高温/高压传热通道朝着微细尺寸和复杂结构发展，但是国内外学者尚未对复杂微细通道在高温和高压条件下由于沿程强变物性特征所产生的传热规律开展深入研究,主要包括局部纵向导热效应、沿程与整体能量传递特性的相互关系和传热强化方法。本项目旨在对极端条件下（高温≥900℃；超临界压力）复杂微细通道内对流传热机理进行研究，揭示整个复杂微细通道的小尺度和大尺度纵向导热效应，以及沿程能量传递机理，获得纵向导热的分析解和局部单元能量传递特性外推整体能量传递特性的计算方法，提出适用于极端条件的强化传热方法。研究结果可为极端条件下的高效强化传热技术提供理论支持，也是常温条件下强化传热技术的有益补充，具有重要的学术意义和工程应用价值。

中文关键词： 高温；超临界压力；微细通道；强化传热；纵向导热

英文摘要： High temperature/high pressure heat transfer technology is one of the most important technologies in the high-efficiency energy and power systems, such as the very high-temperature gas-cooled reactor and the supercritical carbon dioxide Brayton cycle. However, the application and efficiency improvement of these systems are restricted by the efficiency of heat transfer under ultra conditions. For the popose of enhancing the heat transfer performance, the heat transfer channels at high temperature/high pressure are developing towards to directions of smaller and more complex structures. However, the scholars at home and abroad haven't carried out deeper research on the mechanism of heat transfer caused by the significant variations of physical properties along the main flow direction at high temperature and high pressure, including the effect of local longitudinal heat conduction, the relationship of heat transfer and pressure drop performances between the local and whole channels, and the enhanced heat transfer method in the mini-channels under the ultra conditions. The present study will investigate the convective heat transfer mechanism coupled with longitudinal heat conduction in the complex mini-channels under the ultra conditions (high temperature condition≥900℃; supercritical pressure). The goals are to ana

英文关键词： high temperature；supercritical pressure；mini-channel；heat transfer enhancement；longitudinal heat conduction