作　　者： ; ; ; ;

机构地区： 中南大学能源科学与工程学院

出　　处： 《热能动力工程》 2004年第1期63-65,共3页

摘　　要： 介绍了高温空气燃烧过程中蜂窝陶瓷蓄热体的工作原理和损毁原因 ,采用代数雷诺应力模型和修正的速度 -压力耦合算法SIMPLEC ,耦合蓄热体内流体的流动和换热过程 ,运用有限元分析方法 ,对蜂窝陶瓷蓄热体格孔壁面上的应力变化规律进行数值研究 ,并根据计算结果对操作参数进行了改进。结果表明 ,频繁的蓄热和释热过程变换 ,使得蓄热体格孔壁面交替地受到拉应力和挤压应力的作用。流体的流速越大 ,应力变化越大 ;换向时间越短 ,应力交替作用的影响越大。适当地调低烧嘴负荷 ,延长四通阀的换向时间 ,有利于提高蓄热体的使用寿命 。 The operating principle and causes of damage of a honeycomb ceramic regenerator during high-temperature air combustion are described. By using an algebraic Reynolds-stress model and a revised speed-pressure coupled algorithm SIMPLEC, a coupling of fluid flow and heat exchange process in the regenerator was implemented. With the help of a finite-element analysis method, a numerical study of the stress variation law at the cellular-hole wall-surface of the honeycomb ceramic regenerator was performed. On the basis of calculation results, operating parameters were improved on. It has been found that a very frequent switching-over of the process of heat accumulation and release will subject the cellular-hole wall-surface alternately to tension and extrusion stresses. The greater the fluid flow speed, the greater will be the variation of stresses. The shorter the direction-change time, the greater will be the influence of the stress alternating effect. A proper lowering of the load of burner nozzles and a prolongation of the direction-change time of a four-way valve will be conducive to increasing the service life of the regenerator. The calculation results can serve as a basis for the structural design of the regenerator and the optimization of the operating parameters.

关 键 词： 高温空气燃烧 蜂窝陶瓷蓄热体 应力 疲劳破损 有限元

领　　域： [动力工程及工程热物理]