高温长时间风洞喷管冷却结构CFD研究

高温长时间工作的风洞喷管需要冷却，这需要在喷管上开冷却通道槽。本文采用冷却效率较好的矩形冷却通道，研究喷管冷却的影响因素。文中建立喷管冷却结构三维模型，详细分析喷管的传热类型同时考虑辐射换热，基于简单准确原则对计算三维模型作一系列简化假设，最后采用CFD技术进行数值模拟。了解冷却通道高宽比对喷管冷却的影响规律，指出考虑和不考虑辐射换热喷管冷却效果的差别，同时明确气流总温对冷却效果的影响程度并提出改善措施。

CFD study on nozzle cooling structure for a wind tunnel of high temperature and long operation time

A wind tunnel of high temperature and long operation time requires the use of cooling techniques, so we need design cooling channels on the nozzle. In this paper, rectangular cooling channels of high cooling efficiency were used to study the factors af-fecting nozzle cooling. First of all, a three-dimensional model of nozzle cooling structure was established. Secondly, the type of heat transfer of the nozzle was detailedly analyzed and at the same time radiation heat transfer was taken into account. Then based on the principle of simplicity and accuracy, a series of assumptions were made for the calculation model. Finally CFD techniques were used to carry out the numerical simulation. By analyzing the results of study, we obtained the rules how the aspect ratio of cooling channels in-fluenced nozzle cooling, the difference whether or not considering radiation heat transfer, and the impact of gas flow total temperature on nozzle cooling.