项目名称: 水射流冲击高温粗糙靶面的换热特性研究
项目编号: No.51306016
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: 豆瑞锋
作者单位: 北京科技大学
项目金额: 24万元
中文摘要: 水射流冲击沸腾换热是一种高效传热技术。研究表明水射流速度、靶面微观形貌是影响水射流冲击沸腾换热强度的重要因素,多数研究主要关注于低速射流(<7.0m/s)在驻点区的换热特性,并且由于采用粗糙度参数表征靶面微观形貌,导致一些实验研究得出相互矛盾的结论。本项目采用分形参数表征靶面微观形貌,采用实验测试和导热反问题分析的方法,针对高速(15.0m/s~70.0m/s)水射流冲击高温粗糙靶面沸腾换热特性开展研究,阐明靶面微观形貌的分形参数、粗糙度参数对水射流冲击沸腾换热的影响规律,分析比较分形参数、粗糙度参数在靶面沸腾换热特性描述中的合理性。揭示在高速射流条件下,水射流冲击沸腾换热中靶面上热流密度的空间、时间分布规律,特别是揭示驻点处换热热流密度相对较低的原因。该项目的研究为进一步系统深入地认识高速水射流冲击高温粗糙靶面沸腾换热的特性,提高水射流冲击沸腾换热的强度奠定基础。
中文关键词: 水射流;粗糙表面;沸腾换热;导热反问题;分形
英文摘要: Water jet impinging boiling heat transfer is a highly effective heat transfer technique. Numerous researches indicate that the water jet velocity, surface microstructure of target plate are the two of the most important factors which affect the effectiveness of water jet impinging heat transfer. Most of researchers focus on the heat transfer characters at stagnation point in the condition of water jet velocity lower than 7.0m/s. And only the roughness parameters are selected to describe the surface microstructure of target plate, which leads to some conflictive results. During the study of this project, fractal parameters are introduced to describe the surface microstructure of target plate. This project concentrates on the heat transfer characters caused by high velocity water jet (velocity in the region of 15.0m/s~70.0m/s) and rough surface of target plate. These researches try to clarify the relation between water jet impinging boiling heat transfer intensity and fractal parameters of rough surface of target plate. Compare the effectiveness of fractal parameters and roughness parameters in the describing of the boiling characters of target plate's surface. Reveal the space and time distribution of heat flux on surface of target plate, and especially explain the reason why the heat flux at stagnation point is
英文关键词: water jet impinging;rough surface;boiling heat transfer;inverse heat conduction problem;fractal