Effect of cavity-injector/radial-strut relative position on performance of a trapped vortex combustor

Jin, Yi; He, Xiaomin; Jiang, Bo; Wu, Zhongming; Ding, Guoyu; Zhu, Zhixin

doi:10.1016/j.ast.2013.12.014

Cited by 36 publications

(8 citation statements)

References 14 publications

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“…Fuel injection mode was investigated (Zhang et al , 2019a) and Zhu et al (2019) for investigating the interaction between fuel injected and vortex flow inside the cavity. The flow structures with respect to different combinations of injection location height from bottom of cavity and injection angle were investigated and found to be varying between broken and closed vortex structures (Jin et al , 2014a). Further studies focused on blow out characteristics of TVC (Xing et al , 2012) and also on TVC operated as a RQLcombustor (Jiang et al , 2015) and UCC (Zhang et al , 2019a).…”

Section: Computational Studies On Trapped Vortex Combustorsmentioning

confidence: 99%

A review of computational studies on trapped vortex combustors for gas turbine applications

Narayanan

K.M.²

2022

AEAT

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Purpose The purpose of this paper is to comprehensively evaluate the progress in the development of trapped vortex combustors (TVCs) in the past three decades. The review aims to identify the needs, predict the scope and discuss the challenges of numerical simulations in TVCs applied to gas turbines. Design/methodology/approach TVC is an emerging combustion technology for achieving low emissions in gas turbine combustors. The overall operation of such TVCs can be on very lean mixture ratio and hence it helps in achieving high combustion efficiency and low overall emission levels. This review introduces the TVC concept and the evolution of this technology in the past three decades. Various geometries that were explored in TVC research are listed and their operating principles are explained. The review then categorically arranges the progress in computational studies applied to TVCs. Findings Analyzing extensive literature on TVCs the review discusses results of numerical simulations of various TVC geometries. Numerical simulations that were used to optimize TVC geometry and to enhance mixing are discussed. Reactive flow studies to comprehend flame stability and emission characteristics are then listed for different TVC geometries. Originality/value To the best of the authors’ knowledge, this review is the first of its kind to discuss extensively the computational progress in TVC development specific to gas turbine engines. Earlier review on TVC covers a wide variety of applications including land-based gas turbines, supersonic Ramjets, incinerators and hence compromise on the depth of analysis given to gas turbine engine applications. This review also comprehensively group the numerical studies based on geometry, flow and operating conditions.

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Section: Computational Studies On Trapped Vortex Combustorsmentioning

confidence: 99%

A review of computational studies on trapped vortex combustors for gas turbine applications

Narayanan

K.M.²

2022

AEAT

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“…The effectiveness of this turbulence model has been verified from the calculation of flow pattern in TVC. 21,22 Species transportation equation is also solved to obtain mass fraction distribution of cavity-fore flow. To distinguish the flow entering the combustor from the inlet of interest, a new material named air1 is defined.…”

Section: Numerical Simulation Approachmentioning

confidence: 99%

Impact of interaction between cavity flow and mainstream on the performance of a model trapped vortex combustor

Jin

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part G:

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In trapped vortex combustors, radial strut serves as a critical component for it determines the interaction between cavity flow and mainstream and thus combustion and emission performances. Aiming at this topic, a trapped vortex combustor comprising interchangeable aerodynamic multipoint fueling setup, which have different strut width but same passage area, is designed. Experimental studies are carried out to investigate the combustion efficiency and emission performance. The configuration with wider struts exhibits excellent ability of NOx reduction in all operating conditions. However, relatively higher level of carbon monoxide and hydrocarbon are produced especially under cavity-only conditions, and thus the corresponding combustion efficiencies are lower. Nonreacting computational fluid dynamics results show that it is difficult for cavity flow to rush to the tail of bluff body because slenderer struts cannot provide sufficient protection. Thus, flow pattern and mixing of cavity flow and mainstream are influenced. Residence time of cavity-fore flow is calculated using a novel approach referred to as difference of tracer-pulse response. Reacting flow simulations show a different flow structure from reacting flow. It reveals that cavity flow can partially rush to the tail of bluff body through the channel behind the slenderer struts of configuration-1. However, the mixture fraction and temperature behind the bluff body of configuration-1 are still lower, and thus the NOx formation rate is relative lower.

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“…The RANS models have been widely used in TVC simulations. Jin et al (2014a) and Jin et al (2014b) used the k-ɛ model to simulate the cold flow of TVC.…”

Section: Introductionmentioning

confidence: 99%

Very-Large-Eddy Simulation of Nonreactive Turbulent Flow for Annular Trapped Vortex Combustor

Zhang

Jin

Han

et al. 2022

JAFM

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A hybrid Reynolds-averaged Navier-Stokes (RANS) large eddy simulation (LES) method is applied in this work. It called very-large-eddy simulation (VLES) turbulence closure model. The aim of this present study is firstly to validate the accuracy of this method for a specific engineering application (a trapped vortex combustor) and secondly to describe its flow characteristics. The trapped vortex combustor is a new concept that utilizes a large recirculation vortex to stabilize the flame. An accurate prediction of the turbulent flow is meaningful for the trapped vortex combustor. The time-averaged velocity, root-mean-square (rms) velocity, and flow pattern are compared with the experimental data. And the LES model, RANS BSL k-ω model, and RANS k-ɛ model are also applied for the simulation with different mesh resolutions. The results show that the VLES BSL k-ω model provides improved accuracy for velocity prediction. The classical large vortex structure for the trapped vortex combustor is captured qualitatively by the VLES BSL k-ω model also. In addition, the vortex breakdown and processing vortex cone are visualized using the Q-criterion. Furthermore, the VLES BSL k-ω model is not sensitive to the gird resolution. The VLES method is able to predict the turbulent flow of trapped vortex combustor relatively well.

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Effect of cavity-injector/radial-strut relative position on performance of a trapped vortex combustor

Cited by 36 publications

References 14 publications

A review of computational studies on trapped vortex combustors for gas turbine applications

A review of computational studies on trapped vortex combustors for gas turbine applications

Impact of interaction between cavity flow and mainstream on the performance of a model trapped vortex combustor

Very-Large-Eddy Simulation of Nonreactive Turbulent Flow for Annular Trapped Vortex Combustor

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