• Title/Summary/Keyword: 환형 연소기

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Combustion Instability Analysis Using Network Model in an Annular Gas Turbine Combustor (네트워크 모델을 이용한 환형 가스터빈 연소기에서의 연소불안정 해석)

  • Pyo, Yeongmin;Yoon, Myunggon;Kim, Daesik
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2017.05a
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    • pp.896-904
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    • 2017
  • Lean premixed combustion was successful in meeting current NOx emission regulations. However, these often leads to combustion instability. This phenomena results from the feedback relationship between heat release perturbations and acoustic pressure oscillations in the combustor. Researches on the combustion instability in an annular combustor have recently received great attention due to the enhanced NOx requirement in aero-engines. In this study, the thermoacoustic network model has been developed in order to calculate the acoustics for longitudinal as well as circumferential modes in the annular combustor. The combustion model in the network model is calculated by flame transfer function(FTF). Numerical and analytical results are compared to an measurement data.

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Combustion Instability Analysis Using Network Model in an Annular Gas Turbine Combustor (환형 가스터빈 연소기에서 네트워크 모델을 이용한 연소불안정 해석)

  • Pyo, Yeongmin;Yoon, Myunggon;Kim, Daesik
    • Journal of the Korean Society of Propulsion Engineers
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    • v.22 no.3
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    • pp.72-80
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    • 2018
  • Combustion instabilities are caused by the feedback relationship between heat release perturbations and acoustic pressure oscillations in the combustor. Studies on the combustion instability in an annular combustor have recently received great attention due to the enhanced NOx requirement in aero-engines. In this study, a thermoacoustic network model was developed in order to calculate the acoustic characteristics for various modes in the annular combustor. The network model is combined with flame transfer function(FTF) in order to calculate the stability of the combustor. Numerical results are compared with measurement data.

3D Acoustic Field Analysis in an Annular Combustor System under a Cold Flow Condition (환형 연소기 시스템에서 비연소 3D 음향장 해석)

  • Lim, Jaeyoung;Kim, Daesik
    • Journal of the Korean Society of Propulsion Engineers
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    • v.21 no.6
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    • pp.49-56
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    • 2017
  • The current study has developed an in-house 3D FEM code in order to model thermoacoustic problems in an annular system and compared the acoustic field calculation results with measured ones from a benchmark combustor. From the comparison of calculation results with the measured data, the current acoustic code could successfully capture the various acoustic mode found in the annular system. In addition, it was found that the transverse waves in the combustor were strongly affected by the nozzle acoustic impedances, as well, the pressure distributions were closely related with the combustor acoustic pressure field.

A Study on the Turbulent Flowfield in the Annular Combustor with the Multi Swirl Injectors (환형연소기의 Multi Swirl Injector 상호간섭 영향에 관한 연구(1))

  • Kim, Jong-Chan;Sung, Hong-Gye
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2009.05a
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    • pp.289-292
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    • 2009
  • Injector dynamics of multi swirl injectors in an annular combustor have been investigated by LES(Large Eddy Simulation) turbulent model with MPI parallel computation technique. The present study employs the LM6000 lean premixed swirl-stabilized annular combustor. Real shape combustor is simulated in order to investigate the detail interaction mechanism among multi-injectors. The strong vortex breakdown occurs at the impinging surface between the adjacent injectors so that the complex and strong oscillatory pressure propagates inside of the combustor. Tangential pressure fluctuation mode was captured by including multi injectors in computational domain.

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Development and Test of Gas Turbine Combustor for Ground Vehicle PPU(Primary Power Unit) (지상용 가스터빈 주동력장치(PPU) 연소기의 개발과 시험평가)

  • Lee, Dong-Hun;Lee, Kang-Yeop;Chen, Seung-Bae;Yang, Soo-Suk;Ko, Young-Sung;Choi, Seong-Man
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.33 no.8
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    • pp.111-121
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    • 2005
  • A 100kW class gas turbine combustor was developed and tested for PPU(Primary Power Unit) of ground vehicle. The combustor which employed annular-reverse type and pressure swirl atomizer was designed through 1-D analysis, 3-D thermal flow analysis and combustor performance was experimentally investigated on the combustor test rig. The test result was satisfactory. The developed combustor was also tested for environmental and endurance specification under engine adopted conditions and the application of a state-of-the-art gas turbine combustor to ground vehicle PPU turned out to be successful.

Large Eddy Simulation of Swirling Turbulent Flows in a Annular Combustor (환형연소기의 스월난류유동장에 대한 Large Eddy Simulation)

  • Kim, Jong-Chan;Sung, Hong-Gye;Cha, Bong-Jun;Yang, Gye-Byeung
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2008.05a
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    • pp.67-70
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    • 2008
  • Production and dissipation of turbulent structure in a swirl stabilized combustor was investigated using three-dimensional Large Eddy Simulation analysis. The combustor of concern is the LM6000, lean premixed dry low-NOx annular combustor, developed by GEAE. Inlet condition was based on experimental data. Strong vortex breakdown in main stream, vortex ring proceeding downstream, and the turbulent structure periodically oscillating have been observed. Reasonable agreement was obtained by comparison of the results with experiments and previous LES studies.

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Control of the Longitudinal Instability by Symmetry Breaking in the Can Burner Simulating Annular Nozzle (환형노즐을 모사한 캔 연소기에서 Symmetry Breaking에 의한 종-방향 연소불안정성 제어 연구)

  • Lee, Huido;Kim, Jaehyeon;Lee, Keeman
    • Journal of the Korean Society of Propulsion Engineers
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    • v.25 no.2
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    • pp.66-78
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    • 2021
  • In this study, the effect of Symmetry Breaking was compared according to the equivalent ratio condition and the number of nozzles where combustion instability occurs in an annular combustor. Generally, due to the relatively short combustor length, a longitudinal instability was less likely to occur in the annular combustor, but the combustion instability sometimes happens when ducts such as transition piece in gas turbine power station are present. In this case, due to the duct, only the longitudinal instability mode is observed. The characteristics of Symmetry Breaking were investigated according to the number of five lean nozzles and the equivalent ratio combination, and as the equivalent ratio decreased, the effect of Symmetry Breaking rapidly occurred, and the instability was dramatically disappeared and the amplitude was greatly reduced. In addition, it was confirmed that as the number of lean nozzles increased, a phenomenon such as a reduction in the equivalent ratio appeared.

Study of Design Optimization of Reverse-Annular Type Combustor for Small Gas Turbine Engine (선회형 보염구조의 환형 역류형 연소기 최적화)

  • Park, Hee-Ho;Kim, Ki-Tae;Sung, Ok-Seok;Lim, Byeung-Jun
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2011.04a
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    • pp.401-405
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    • 2011
  • Although the APU combustors were developed successfully, it could face many unexpected hardships in a engine or a system operated under the severe environment. This study is to be verified and settled by experimently and analytically of the problems and issues occurred in a variety of engine and system operation tests.

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Turbulent Combustion Characteristics of a Swirl Injector in a Gas Turbine Annular Combustor Using LES and Level-set Flamelet (LES와 Level-set Flamelet 기법을 이용한 가스터빈 환형 연소기용 스월 분사기의 난류 연소 특성)

  • Kim, Lina;Hong, Ji-Seok;Jeong, Won Cheol;Yoo, Kwang-Hee;Kim, Jong-Chan;Sung, Hong-Gye
    • Journal of the Korean Society of Propulsion Engineers
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    • v.18 no.2
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    • pp.1-9
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    • 2014
  • To investigate the flame dynamics in an annular combustor with single swirl injector, a 3D large-eddy simulation (LES) and a level-set flamelet turbulent combustion model have been implemented. The LM6000 developed by GEAE has been used as the combustor of concern and boundary conditions are based on experimental data. The strong central toroidal recirculation zone induced by the volume expansion of the combustion gas and the vortex breakdown continuously occurred through the procession of the vortex with decreasing strength, are observed.