摘要
针对喷嘴数和温比对叶片前缘旋流冷却特性影响的问题,根据实际燃气轮机前缘结构进一步完善了旋流冷却模型,建立了含有进气腔室的旋流腔结构,采用数值模拟方法分析了喷嘴数和温比对旋流冷却特性的影响。研究时保持进口雷诺数和靶面温度不变,仅改变喷嘴数和温比。研究结果表明:进气腔室的引入使得喷嘴冷气沿流动方向逐渐增加。随着喷嘴数增加,喷嘴冷气流速降低,压力系数增加,流阻系数减小,换热强度降低但均匀性提高,综合换热因子增大。随着温比增加,喷嘴冷气流速增加,流阻系数减小,靶面热流密度降低,换热强度提高,综合换热因子增大。对于含有进气腔的叶片前缘冷却结构,推荐选取喷嘴数为6,温比范围为0.6~0.7。
Aiming at the influences of the number of nozzles and temperature ratio on vortex cooling characteristics of gas turbine blade leading edge,a coolant chamber was added to establish a more reasonable vortex cooling configuration.Numerical method was used to investigate the flow and heat transfer behavior.The inlet Reynolds number and target temperature remained constant while the number of nozzles and temperature ratio were changed in the research.Results showed that the mass flow of air from nozzles increases along the flow direction with the introduction of coolant chamber.As the number of nozzles increases,the velocity of nozzle air,the friction coefficient and the heat transfer intensity decrease while the pressure coefficient,the uniformity of heat transfer intensity distribution and the thermal performance factor increase.As temperature ratio increases,the velocity of air from nozzles,the heat transfer intensity and the thermal performance factor increase,while the friction coefficient and the target heat flux decrease.For the gas turbine blade leading edge with the coolant chamber,the number of nozzles N=6and the temperature ratio0.6-0.7are recommended.
作者
范小军
邹佳生
周源远
李亮
FAN Xiaojun;ZOU Jiasheng;ZHOU Yuanyuan;LI Liang(School of Energy and Power Engineering,X i'an Jiaotong University,X i'an 710049,China;;Shaanxi Engineering Laboratory of Turbomachinery and Power Equipm ent,X i'an 710049,China)
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2018年第3期19-24,33,共7页
Journal of Xi'an Jiaotong University
关键词
旋流冷却
进气腔
喷嘴数目
温比
vortex cooling
coolant chamber
number of nozzles
temperature ratio
