【作者】 方立；

【导师】 常海萍；

【作者基本信息】 南京航空航天大学 ， 热能工程， 2003， 硕士

【摘要】 本文是涡轮叶片超级冷却技术的初步研究。对于彻体力场下的热驱动现象进行了验证性显现实验研究与分析。实验中针对液体氟利昂R12研究了其在重力场和离心力场下的热驱动现象，并对热驱动现象进行了理论分析。设计了狭缝高为1mm的封闭循环通道一系列实验件，通过改变热流密度(5000～80000W／m~2)和旋转速度(160～1140rpm)以及介质物性(R12与水)，研究分析了他们对热驱动流体流动换热的影响效果。利用热电偶测温手段获得了实验件表面温度分布趋势，同时采用了一种新型温度测试技术——热色液晶法，研究了热色液晶测温技术及其制备方法，在实验过程中得到了清晰的液晶显色照片，液晶照片显示的温度场直观地反映出热驱动流动规律。根据实验数据和液晶图片分析，本文达到了显示细小循环通道内热驱动流场的目的，掌握了热驱动流动随影响因素改变的基本变化规律，为进一步的研究工作打下一定的基础。更多还原

【Abstract】 This paper is the fundamental study of the super cooling technology of turbo blade, and the purpose is focused on the visualization of thermal driving flow under the body force field.Freonl2 is used as the medium to study the thermal driving effect under the gravity and centrifugal force fields, and the theory of thermal driving flow is analyzed. To study the influence on the heat transfer and flow, we design a series of objects which channel’s height is 1mm, and change the heat flux (from 5000 to 80000W/m2), the rotation speed (from 160 to 1140rpm) and the property of medium (water and freon12). The thermocouple is used to measure the temperature distribution on the surface of the object, and at the same time, a new method for measuring temperature-Thermo-Liquid Crystal is introduced. The process of making the liquid crystal film is presented and some distinct liquid crystal photographs are obtained in those experiments. The temperature distribution presented by the photographs shows the law of thermal driving flow directly.Based on the data and liquid crystal photographs, we can visualize the flow of the liquid medium driven by thermal driving force in the circular small sized channel, and get the flow law according to various factors. The results concluded from this paper could be helpful for the further study in the future.更多还原