The storage heater is the one of heating methods for current high temperature clean air wind-tunnel application. Aiming at cored bricks storage heater, the preliminary design procedure of cored bricks matrix was investigated, including thermal performance analysis, pressure-drop and thermal stress evaluation. Combined with a typical wind-tunnel test condition, a cored bricks matrix was preliminarily designed and analyzed in detail. Especially the effects of geometric parameters on thermal performance, pressure-drop and thermal stress resistance were evaluated. The evaluation results indicate that the hole diameter and spacing are the most important design parameters dominating the other geometric parameters, heater working performance and security. The matrix height is a key designed parameter to stabilize the outlet air temperature and test duration. The preliminary design concept of cored bricks matrix was finally selected in consideration of tradeoff, which suggested that the expected Mach 6. 0 flight conditions can be well simulated by the designed cored bricks matrix of storage heater. The present research efforts could provide well reference for conceptual design and scheme evaluation of the cored bricks storage heater.%蓄热式加热器是目前高温纯净空气风洞最具潜力和优势的一种加热方式.针对空心砖型蓄热式加热器,开展了空心砖型蓄热单元初步设计研究,涉及换热性能、压降控制和热应力评估等方面.结合一个预定的试验状态要求,对空心砖型蓄热单元的初步设计进行分析与讨论,评估孔径、孔间距、蓄热阵高度等几何设计参数对换热性能、压降控制和当地热应力水平的影响,进而确定空心砖型蓄热单元的基本设计方案,结果表明孔径、孔间距是加热器设计的关键参数,对其它参数、运行性能、安全性具有显著影响,高度选择直接影响出口气流温度水平及其稳定时间,初步设计方案可以很好地满足马赫数6.0试验模拟状态要求.研究结果可为空心砖型蓄热式加热器工程设计和方案评估提供有益的参考.
展开▼
