湿空气透平冷却技术研究

doi:10.12096/j.2096-4528.pgt.21050

摘要/Abstract

摘要：

为了研究湿空气对透平叶片冷却的影响特性，构建湿空气透平冷却性能预测模型，建立了常压透平叶片冷却实验平台，开展了以湿空气为冷却工质的实验研究。在湿空气含湿量为15~80g/kg、温度为200℃的条件下，对叶片前缘冲击冷却、肋片扰流U型通道冷却和叶片尾缘柱肋冷却进行了实验研究，探究了不同雷诺数下3种冷却方式的靶面换热性能随含湿量和温度的变化规律。研究结果表明：靶面换热强度随冷气含湿量的提高而增强，随冷气温度的提高而减弱，随冷气雷诺数的提高而增强。在含湿量约为180g/kg时，相对于干空气，冲击冷却、肋片扰流U型通道冷却、柱肋冷却的靶面平均努塞尔数最大分别提高了6.5%、10.0%、9.2%。

关键词: 燃气轮机, 湿空气透平, 冷却工质, 冷却性能

Abstract:

In order to study the influence of humid air on the cooling performance of turbine blade and build the cooling performance prediction model of humid air turbine, the experimental platform of normal pressure turbine blade cooling was established, and the experimental study of humid air as coolant medium was carried out. Under the condition of humid air moisture content of 15-80g/kg and temperature of 200℃, the impingement cooling of blade leading edge, the U-channel cooling of fin disturbing flow and the pin-fin cooling of blade trailing edge were experimentally studied. The variation of heat transfer performance of the target wall with moisture content and temperature under different Reynolds numbers was explored. The results indicate that the heat transfer intensity of the target wall increases with the increasing coolant humid ratio, the decreasing coolant temperature and the increasing coolant Reynolds number. When using the humid air with moisture content of 180g/kg, the area-averaged Nussult number of target wall for impingement cooling, U-channel cooling and pin-fin cooling increases by 6.5%, 10.0% and 9.2% respectively, compared with the case using dry air.

Key words: gas turbine, humid air turbine, coolant medium, cooling performance

中图分类号:

TK14

朱华, 严彪, 刘雨松, 李亮. 湿空气透平冷却技术研究[J]. 发电技术, 2021, 42(4): 412-421.

Hua ZHU, Biao YAN, Yusong LIU, Liang LI. Study on Humid Air Turbine Cooling Technique[J]. Power Generation Technology, 2021, 42(4): 412-421.

图/表 15

图1 实验台系统结构

Fig.1 Structure of experiment platform system

图2 实验台实物图

Fig.2 Photo of experiment platform system

图3 主加热器发热元件

Fig.3 Heating elements of main heater

图4 蒸汽系统元件

Fig.4 Components of steam system

图5 实验段实物图

Fig.5 Photo of experiment rig

图6 冲击冷却实验段示意图

Fig.6 Schematic diagram of impingement cooling experiment rig

图7 冲击冷却靶面温度分布

Fig.7 Temperature distribution of impingement cooling target wall

图8 冲击冷却Nu/Nu0随含湿量d变化曲线

Fig.8 Variation curve of Nu/Nu0 with moisture content d for impingement cooling

图9 U型通道冷却实验段示意图

Fig.9 Schematic diagram of U-channel cooling experiment rig

图10 U型通道冷却靶面温度分布

Fig.10 Temperature distribution of U-channel cooling target wall

图11 U型通道冷却Nu/Nu0随含湿量d变化曲线

Fig.11 Variation curve of Nu/Nu0 with moisture content d for U-channel cooling

图12 柱肋冷却实验段示意图

Fig.12 Schematic diagram of pin-fin cooling experiment rig

图13 柱肋处局部靶面温度分布及流场示意图

Fig.13 Local temperature distribution and schematic diagram of flow field near pin-fin cooling target wall

图14 柱肋冷却局部靶面温度分布

Fig.14 Local temperature distribution of pin-fin cooling target wall

图15 柱肋冷却Nu/Nu0随含湿量d变化曲线

Fig.15 Variation curve of Nu/Nu0 with moisture content d for pin-fin cooling

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