摘要
为了研究不同冷却介质对燃气轮机预旋共转盘腔换热特性的影响,采用数值计算方法分析了空气和蒸汽2种介质下预旋系统共转盘腔表面的换热过程,对比了2种冷却介质在不同旋转雷诺数、无量纲质量流量和进口总温条件下的换热效果。结果表明:相同无量纲质量流量下预旋进气的转盘冷却效果优于无预旋;不同无量纲质量流量下,蒸汽对共转盘腔表面的换热效果均优于空气;旋转雷诺数在5.5×106~7.2×106内,相同旋转雷诺数下的蒸汽冷却下的转盘平均Nu比空气冷却提高约22%,低旋转雷诺数时2种冷却介质的冷却效果略优于高旋转雷诺数时;不同进口总温下,蒸汽冷却效果仍然优于空气,但随着进口总温的升高其优势逐渐减弱,转盘表面传热平均Nu随预旋进口总温的升高而减小。
To investigate the effects of different cooling mediums on the heat transfer performance of a gas turbine co-rotating cavity with pre-swirl inflow, a numerical analysis was conducted on the heat transfer process of the co-rotating disc cooled by air and steam in the pre-swirl system, so as to compare the heat transfer effectiveness of the two cooling ways at different rotational Reynolds numbers, non-dimensional mass flow rates and at different total inlet temperatures. Results show that the effectiveness of both air and steam cooling on the rotating disc with pre-swirl inflow is better than that without pre-swirl inflow un- der the same non-dimensional mass flow rate. The heat transfer performance of co-rotating cavity with steam cooling is superior to that with air cooling, under different non-dimensional mass flow rates. The average Nusselt number of steam cooling is 22G higher than air cooling at the same rotational Reynolds number ranging from 5.5X l0G to 7.2 X 106. For both the mediums, the cooling effect of rotating disc at low rotational Reynolds number is slightly better than at high rotational Reynolds number. At different to- tal inlet temperatures, the effectiveness of steam cooling is always better than air cooling, but the superi- ority weakens with the rise of total inlet temperature. The average Nusselt number of co-rotating cavity re- duces with the increase of total inlet temperature.
作者
胡伟学
王锁芳
毛莎莎
HU Weixue(Jiangsu Province Key Engineering,Nanjing Laboratory of University of WANG Suo fang,Aerospace Power MAO Shasha System,School of Energy Aeronautics and Astronautics,Nanjing 21001 and Power 6,China)
出处
《动力工程学报》
CAS
CSCD
北大核心
2018年第8期633-639,共7页
Journal of Chinese Society of Power Engineering
基金
南京航空航天大学研究生创新基地(实验室)开放基金资助项目(kfjj20170204)
关键词
预旋系统
蒸汽冷却
空气冷却
共转盘腔
冷却效果
pre-swirl system
steam cooling
air cooling
co-rotating cavity
cooling dfectiveness