高效蓄热室的传热数值模拟及实验分析

根据蓄热室结构特性，建立了高效蓄热室传热计算的数学模型．通过数值模拟分析了蓄热体材质、换向时间、温度效率和热效率等的关联关系．比较发现，在换向初期，模拟计算结果与实验结果相差较大，但当换向7—10s后，两者的结果基本吻合，初步验证了模拟求解的可靠性．根据模拟计算结果进一步分析了蓄热体、换向时间等对废气的排放温度和空气的预热温度的影响，得出了本研究条件下，刚玉质小球的适宜换向时间为60s左右，高铝质和粘土质小球的适宜换向时间为20—30s．蓄热室温度效率可达到80％以上，热效率可达到70％以上．

Heat Transfer Simulation and Experiment of Highly Efficient Regenerator

On the base of regenerator configuration character, the heat transfer mathematics models are set up. The relevant relations of regenerator medium, exchange time, temperature efficiency and thermal efficiency are analyzed by numerical simulation. The results are anastomotic by numerical simulation and by experiments after exchanging 7 - 10 s. And it indicts reliability by simulation. The authors study effects of exhaust gas temperature and air preheat temperature influenced by regenerator medium, exchange time etc. , by numerical simulation and experiment. On the case, the suitable exchange time of corundum globule is about 60s, the suitabe exchange time of high aluminum and clay ceramic ball is 20 -30 s. Temperature efficiency is up more than 80%, thermal efficiency is up more than 70%.