Numerical investigation on flow structures of a laboratory-scale trapped vortex combustor

Jin, Yi; He, Xiaomin; Zhang, Jingyu; Jiang, Bo; Wu, Zhongming

doi:10.1016/j.applthermaleng.2014.02.030

Cited by 46 publications

(9 citation statements)

References 9 publications

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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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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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“…13 There were evidences in literature for using standard k-ɛ model and standard wall functions to simulate the turbulent flow in TVC (trapped vortex combustor) and they were validated to be reasonable accuracy to reveal the cavity flow structures. 14 The well-known SIMPLE algorithm was applied for pressure–velocity coupling. Convection and diffusion terms were discretized by the second-order upwind scheme.…”

Section: Model Augmentor Simulationmentioning

confidence: 99%

Experimental investigations on combustion characteristics of a cavity pilot augmentor of the turbine-based combined cycle engine

Zhu

Xue

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part G:

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A cavity flame holder has been a very promising novel concept to be applied to the augmentor of a turbine-based combined cycle (TBCC) engine as it offers improvements in ignition performance, altitude relight, lean blowout limit, operating range, as well as combustion efficiency compared to conventional bluff body flame holders. The present paper describes the detailed designs of a cavity pilot augmentor and provides a laboratory-scale test rig. A series of experiments has been conducted to investigate the combustion characteristics of the test rig under atmospheric pressure. Experimental results show that for the bypass inlet temperature 343–473 K and inlet Mach number 0.25–0.40, ignition equivalence ratio and ignition pressure oscillation obtained is between 0.94–1.72 and 1.1–2.4% respectively, and lean blowout equivalence is between 0.42 and 0.92, indicating good ignition and lean blowout performances; as the total fuel-to-air ratio increases, the combustion efficiency decreases in the main at both afterburner operating mode and ramjet operating mode, while the increase of the bypass inlet Mach number or temperature is beneficial to high combustion efficiency, especially as inlet temperature over 423 K, and the combustion efficiency got in present experiment is between 70% and 95%. This paper demonstrates the feasibility for the cavity pilot flame holder to be applied to a realistic augmentor of TBCC engine preliminarily and provides reference for TBCC augmentor design.

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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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Numerical investigation on flow structures of a laboratory-scale trapped vortex combustor

Cited by 46 publications

References 9 publications

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

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

Experimental investigations on combustion characteristics of a cavity pilot augmentor of the turbine-based combined cycle engine

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

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