条缝喷嘴几何结构对旋流冷却特性的影响
Effects of slot nozzle geometry on the cooling characteristics of swirl flow
马永乐 1成克用 2淮秀兰1
作者信息
- 1. 中国科学院工程热物理研究所,北京 100190;中科南京未来能源系统研究院,南京 211135;中国科学院大学工程科学学院,北京 100049
- 2. 中国科学院工程热物理研究所,北京 100190;中科南京未来能源系统研究院,南京 211135;中国科学院大学南京学院,南京 211135
- 折叠
摘要
为了寻求更优的透平叶片前缘冷却结构,建立了条缝喷嘴旋流冷却结构,并选用标准k-ε湍流模型进行数值计算,探究了条缝喷嘴几何结构对旋流冷却流动与换热特性的影响.在所研究雷诺数范围内,条缝喷嘴旋流冷却靶面换热流向不均匀度比离散结构小67.8％～71.9％;条缝喷嘴旋流冷却靶面换热强度在喷嘴范围内沿流向呈上升趋势;通过改变条缝喷嘴截面斜度角可以有效影响靶面换热分布,当斜度角为0.24 rad时,换热强度沿流向基本呈均匀分布,超过此值,则呈下降趋势;条缝喷嘴高度对旋流冷却换热均匀性影响较为明显,当喷嘴高度是水力直径3.41倍时,综合性能最好;此外,还探究了条缝喷嘴宽度对旋流冷却的影响.
Abstract
To find the optimized cooling structure of turbine blade leading edge,the swirl cooling structure with slot nozzle was established and numerical simulations with the standard k-ε turbulence model were adopted to survey the influence of slot nozzle on the flow and heat transfer characteristics of swirl cooling.Within the studied range of Reynolds number,the non-uniformity of heat transfer for the slot nozzle swirl cooling was 67.8％—71.9％lower than that of the disperse jet swirl cooling along the axial direction.Within the range of the nozzle,the heat transfer intensity of the slot nozzle swirl cooling showed an upward trend along the flow direction.The heat transfer of the bottom surface could be effectively influenced by the inclination angle of the cross-section trapezoid of slot nozzle.When the inclination angle of the cross-section trapezoid was 0.24 rad,the heat transfer intensity was uniformly distributed,and showed a downward trend when the inclination angle of the cross-section trapezoid exceeded 0.24 rad.Once the angle was larger than 0.24 rad,the heat transfer intensity decreased.The slot nozzle height had important effect on the uniformity of heat transfer of swirl cooling and the comprehensive performance was obtained when the height was 3.41 times of the diameter.In addition,the influence of width of the slot nozzle on the swirl cooling was explored.
关键词
燃气轮机/叶片前缘/条缝喷嘴/旋流冷却/流动传热Key words
gas turbine/leading edge of blade/slot nozzle/swirlcooling/flow and heat transfer引用本文复制引用
基金项目
工信部国家科技重大专项(2017-Ⅲ-0003-0027)
出版年
2024
NETL
NSTL
万方数据