Study on Humid Air Turbine Cooling Technique

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

Abstract

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

CLC Number:

TK14

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

Figures/Tables 15

Fig.1 Structure of experiment platform system

Fig.2 Photo of experiment platform system

Fig.3 Heating elements of main heater

Fig.4 Components of steam system

Fig.5 Photo of experiment rig

Fig.6 Schematic diagram of impingement cooling experiment rig

Fig.7 Temperature distribution of impingement cooling target wall

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

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

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

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

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

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

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

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

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