Influence of evaporation tube scheme on the flow field and combustion characteristics in a micro gas turbine combustor

Abstract

Micro gas turbines have broad application prospects because of their compact size, low emissions, fuel flexibility, and high reliability. This study focused on a typical reverse flow micro gas turbine combustor and designed six overall structural schemes of micro gas turbine combustors with different evaporation tube arrangements and lengths. Numerical simulations and combustion experiments were also conducted. The data show that a structural scheme in which the evaporation tube is at an angle of 45° to the combustion liner axis provides the best performance. This scheme allows for the formation of multiple swirling regions at the head of the combustion liner, decreasing the flow velocity at the head of the combustion liner from 70 to 20 m/s, thus effectively reducing the flow velocity; in addition, the combustor can organize combustion at a higher inlet flow velocity. This scheme shows the best combustion performance, and the combustion efficiency reaches more than 98%. Increasing the length of the evaporation tube strengthens the circumferential connection and performance of the combustor flame. This also results in an increase in the jet velocity exiting the evaporation tube. The higher jet velocity increases the velocity at the head of the combustion liner. This change affects the temperature distribution within the combustion liner. Specifically, it leads to an increase in the temperature gradient inside the liner.

Keywords

Micro gas turbine combustor / Evaporation tube / Reverse flow combustor / Combustion test

References

[1] Zhang J, Chen Y, Li N, et al. . A weak fault identification method of micro-turbine blade based on sound pressure signal with LSTM networks. Aerosp Sci Technol, 2023, 136108226

[2] Banihabib R, Assadi M. The role of micro gas turbines in energy transition. Energies, 2022, 15(21): 8084.

[3] Lin P, Du X, Shi Y, et al. . Modeling and controller design of a micro gas turbine for power generation. ISA Trans, 2022, 124: 411-426.

[4] Enagi II, Al-attab K, Zainal Z et al (2022) Palm biodiesel spray and combustion characteristics in a new micro gas turbine combustion chamber design. Energy 254:124335

[5] Wang CS, Yan JY, Marnay C, et al. . Distributed energy and microgrids (DEM). Appl Energy, 2018, 210: 685-689.

[6] Rist JF, Dias MF, Palman M, et al. . Economic dispatch of a single micro-gas turbine under CHP operation. Appl Energy, 2017, 200: 1-18.

[7] Abagnale C, Cameretti MC, De Robbio R, Tuccillo R. CFD study of a MGT combustor supplied with syngas. Energy Procedia, 2016, 101: 933-940.

[8] Jiaqiang E, Ding J, Chen J, Liao G, Zhang F, Luo B. Process in micro-combustion and energy conversion of micro power system: a review. Energy Convers Manage, 2021, 246114664

[9] Guan J, Lv X, Spataru C, Weng Y. Experimental and numerical study on self-sustaining performance of a 30-kW micro gas turbine generator system during startup process. Energy, 2021, 236121468

[10] De Paepe W, Montero Carrero M, Bram S, Parente A, Contino F. Toward higher micro gas turbine efficiency and flexibility—humidified micro gas turbines: a review. J Eng Gas Turbines Power, 2018

[11] Enagi II, Al-Attab K, Zainal Z. Combustion chamber design and performance for micro gas turbine application. Fuel Process Technol, 2017, 166: 258-268.

[12] Yan P, Fan W, Qi S, et al. . Numerical investigation on the effect of g-load on high-g ultra-compact combustor. Aerosp Sci Technol, 2022, 121107305

[13] Gimelli A, Sannino R. Thermodynamic model validation of Capstone C30 micro gas turbine. Energy Procedia, 2017, 126: 955-962.

[14] Chen Y, Fan Y, Bai XS, et al. . Experimental study on combustion and flow resistance characteristics of an afterburner with air-cooled bluff-body flameholder. Aerosp Sci Technol, 2022, 123107488

[15] Lu J, Fu Z, Liu J, et al. . Influence of air distribution on combustion characteristics of a micro gas turbine fuelled by hydrogen-doped methane. Energy Rep, 2022, 8: 207-216.

[16] Okafor EC, Somarathne KKA, Hayakawa A, Kudo T, Kurata O, Iki N, et al. . Towards the development of an efficient low-NOx ammonia combustor for a micro gas turbine. Proc Combust Inst, 2019, 37(4): 4597-4606.

[17] Zhang P, Liu YP, Li JH, et al. . Design and numerical simulation of a micro-gas turbine combustor. J Appl Fluid Mech, 2019, 12(5): 1707-1718.

[18] Bai N, Fan W, Zhang R 2023 A mixing enhancement mechanism for a hydrogen transverse jet coupled with a shear layer for gas turbine combustion. Phys Fluids 35(4):045111

[19] Yang X, Fan W, Zhang R. Experimental investigations on aviation kerosene multi-jets in high temperature and low pressure air crossflow. Fuel, 2022, 324124828

[20] Yang X, Fan W, Zhang R. Experimental investigations on fuel spatial distribution characteristics of aeroengine afterburner with all typical components. Fuel, 2023, 346128320

[21] Cameretti M C, De Robbio R, Tuccillo R. CFD study of a micro-combustor under variable operating conditions. No. GT2017-63661.

[22] Zhao W, Fan W, Zhang R. Experimental study on flow field characteristics of TBCC multibypass combustor. Aerosp Sci Technol, 2023

[23] Chen J, Mitchell MG, Nourse JG. Development of Ultra-Low Emission Liquid Fuel-Fired Microturbine Engines for Vehicular Heavy Duty Applications. Turbo Expo: Power for Land, Sea, and Air, 2009, 48869: 281-289

[24] He Y, Kim CH. Effect of nozzle port shape of fuel injector of micro gas turbine engine combustor on mixture gas formation for combustion. Fluids, 2022, 7(6): 184.

[25] Kirubakaran V. Prediction of lean blowout performance on variation of combustor inlet area ratio for micro gas turbine combustor. Aircr Eng Aerosp Technol, 2021, 93(5): 915-924.

[26] Liu H, Zeng Z, Guo K. Numerical investigation of the hydrogen swirl combustion flow in a micro gas turbine burner. Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 2022, 236(8): 1633-1649

[27] Zhang Q, Kou R, Li C. Numerical study on fuel atomization and evaporation characteristics of evaporative tubes in micro combustor. Aeroengine, 2019, 45(1): 1-5

[28] Do KH, Kim T, Han YS, et al. . Investigation on flow distribution of the fuel supply nozzle in the annular combustor of a micro gas turbine. Energy, 2017, 126: 361-373.

[29] Sher AA, Ahmad N, Sattar M, et al. . Computational analysis of multi-fuel micro-gas turbine annular combustion chamber. J Therm Anal Calorim, 2024, 149(8): 3317-3329.

[30] Abdulwahab MR, Al-attab KA, Badruddin IA, et al. . Biofuels spray and combustion characteristics in a new micro gas turbine combustion chamber design with internal exhaust recycling. Case Stud Therm Eng, 2025, 65105595

[31] Zhao W, Fan W, Zhang R. Study of the mixing characteristics of a multibypass combustor of a turbine-based combined cycle. Appl Therm Eng, 2023, 219119582

[32] Shih TH, Liou WW, Shabbir A, et al. . A new k-ϵ eddy viscosity model for high reynolds number turbulent flows. Computers Fluids, 1995, 24(3): 227-238.

[33] Dong J, Hu Q, Yu M, et al. . Numerical investigation on the influence of mixing chamber length on steam ejector performance. Appl Therm Eng, 2020, 174115204

[34] SadatAkhavi S, Tabejamaat S, EiddiAttarZade M, Kankashvar B. Experimental and numerical study of combustion characteristics in a liquid fuel CAN micro-combustor. Aerosp Sci Technol, 2020, 105106023

[35] Dwivedi V, Hari S, Kumaran S et al (2021) Experimental and numerical study of flame structure and emissions in a micro gas turbine combustor. Int J Turbo Jet Eng 41:1–14

[36] Li H, Zou Z, Li H, Chen Y, Fu C. Thermal performance of a microchannel primary surface recuperator for portable microturbine generators: design and experimental study. Appl Therm Eng, 2022, 206118103

[37] Kankashvar B, Tabejamaat S, EidiAttarZade M, Sadatakhavi SM, Nozari M. Experimental study of the effect of the spray cone angle on the temperature distribution in a can micro-combustor. Aerosp Sci Technol, 2021, 115106799

[38] Xing C, Liu L, Qiu P, Shen W, Lyu Y, Zhang Z, et al. . Combustion performance of an adjustable fuel feeding combustor under off design conditions for a micro-gas turbine. Appl Energy, 2017, 208: 12-24.

[39] Zhao Y, Fan W, Zhang R. Influence of coupling schemes of radial and circumferential flame stabilization modes on flow and combustion characteristics of compact combustion for gas turbine. Fuel, 2023, 333126543

Funding

National Natural Science Foundation(52172351)

RIGHTS & PERMISSIONS

The Author(s)