Fuel/Air Premixing Characteristics of Lean Premixed Injectors with Multi-Points Injection

被引：0

作者：

Sun F.-J. ^{[1
]}

Guo L.-H. ^{[1
]}

Li H. ^{[1
]}

Li J. ^{[2
]}

Suo J.-Q. ^{[1
]}

机构：

[1] School of Power and Energy, Northwestern Polytechnical University, Xi’an

[2] AECC Shenyang Engine Research Institute, Shenyang

来源：

Tuijin Jishu/Journal of Propulsion Technology | 2023年 / 44卷 / 02期

关键词：

Gas turbine; Lean premixed injector; Low emission combustor; Multi-points injection; Premixing characteristics; Spatial mixing variance;

D O I：

10.13675/j.cnki.tjjs.2205030

中图分类号：

学科分类号：

摘要：

Based on the development trend of incorporating fuel holes into swirler-vanes，an original lean premixed injector with only-convergent outlet was proposed and its fuel holes were located on the surface of hollow swirler-vanes. Firstly，the feasibility of using CO2 instead of CH4 to study premixing characteristics was verified，then the influence of key structural parameters（swirler-vanes angles，fuel hole diameters and premixing section lengths）and aerodynamic parameters（mainstream air pressure and temperature）on premixing characteristics of lean premixed injector was investigated by experimental and numerical methods. The results show that the increase of swirler-vanes angle could improve premixing uniformity by increasing the turbulent intensity，while the fuel hole diameters affected the premixing characteristics by controlling the penetration depth. Although lengthening the premixing section was conducive to more uniform mixing，it also weakened the swirl intensity and affected flame stability of the combustor. Because the swirl flow was in the“self modeling zone”，the mainstream air pressure has no significant effect on the mixing uniformity，while the increase of air temperature could shorten the premixing time and reduce the mixing uniformity. In addition，the Spatial Mixing Variance（SMV）values of the injectors with different structural parameters in the section，where the stagnation point of the main recirculation zone was located，were all lower than 5×10-4. The lean premixed injector incorporating fuel holes into swirler-vanes can meet the requirement of mixing uniformity for lean premixed combustor. © 2023 Journal of Propulsion Technology. All rights reserved.

引用

共 23 条

[1] (2017)
[2] (2004)
[3] Mcdonell V., Chapter 5-Lean Combustion in Gas Turbines, (2008)
[4] Fric T F., Effects of Fuel-Air Unmixedness on NOx Emissions［J］, Journal of Propulsion and Power, 9, 5, pp. 708-713, (1993)
[5] Biagioli F，, Guethe F., Effect of Pressure and Fuel-Air Unmixedness on NOx Emissions from Industrial Gas Turbine Burners［J］, Combustion and Flame, 151, 1-2, pp. 274-288, (2007)
[6] ZHAO Wei-jie, YU Zongming, HE Hong-juan, Et al., Experiment and Numerical Study on Emission Characteristics of Premixing Fuel Nozzle in Gas Turbine Combustor［J］, Journal of Propulsion Technology, 41, 2, pp. 362-371, (2020)
[7] Vandervort C L., 9ppm NOx/CO Combustion System for "F" Class Industrial Gas Turbines［J］, Journal of Engineering for Gas Turbines and Power, 123, 2, pp. 317-321, (2001)
[8] Leonard G，, Stegmaier J., Development of an Aeroderivative Gas Turbine Dry Low Emissions Combustion System ［J］, Journal of Engineering for Gas Turbines and Power, 116, 3, pp. 542-546, (1994)
[9] Joshi N D，, Epstein M J，, Durlak S., Development of a Fuel Air Premixer for Aero-Derivative Dry Low Emissions Combustors［C］, New York：ASME 1994 International Gas Turbine and Aeroengine Congress and Exposition, (1994)
[10] Tanimura S，, Nose M，, Ishizaka K，, Et al., Combustor for Mitsubishi G Class Gas Turbines ［C］, (2008)

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