Analysis of Internal Flow Characteristics of Gas Turbine Ejector Mixer with Valve Plate

doi:10.12096/j.2096-4528.pgt.21019

Abstract

Abstract:

The ejector mixer plays a decisive role in the cooling and noise reduction of gas turbine. Compared with the traditional ejector mixer, the ejector mixer with valve plate structure has better performance. In order to fully explore its internal flow characteristics and provide a basis for optimal design, the computational fluid dynamics (CFD) numerical simulation was used to study the ejector configuration with or without valve plate. The ejector performance parameters such as ejector ratio, average outlet temperature, maximum temperature and average outlet velocity were compared and analyzed. The ejector performance with different valve openings was analyzed for the ejector mixer with valve plates. The results show that the mixing performance of the ejector mixer with valve plate structure is significantly improved. The ejection performance is the best when the valve opening is 45°.

Key words: gas turbine, ejector mixer, ejection performance, valve plate opening

CLC Number:

TK47

Kai WEI, Zhong LUO, Yonghang SUN, Yu WANG. Analysis of Internal Flow Characteristics of Gas Turbine Ejector Mixer with Valve Plate[J]. Power Generation Technology, 2021, 42(4): 431-436.

Figures/Tables 13

Fig.1 Operating principle of typical ejector

Fig.2 Configuration of traditional ejector mixer

Fig.3 Configuration of ejector mixer with valve plate

Fig.4 Different valve plate openings of ejector mixer

Fig.5 Spherical encryption region

Fig.6 Grid diagram after spherical encryption

Fig.7 Comparison of experimental data and CFD simulation results

Tab. 1 Performance comparison of ejector mixers with and without valve plates

参数	无阀片	有阀片
引射比	2.66	8.38
出口最高温度/℃	605.00	559.29
出口平均温度/℃	321.52	292.74
出口平均速度/(m/s)	23.74	28.73

Fig.8 Temperature distribution of symmetrical surface with and without valve plates

Fig.9 Influence of valve opening on ejection ratio

Fig.10 Influence of valve opening on average outlet temperature

Fig.11 Influence of valve opening on average outlet velocity

Fig.12 Influence of valve opening on maximum outlet temperature

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