Study of a thermo-acoustic instability triggering in a low-swirl burner using simultaneous time-resolved acetone and OH-PLIF

Renaud, Antoine; Yokomori, Takeshi; Tachibana, Shigeru

doi:10.1016/j.proci.2018.08.036

Cited by 17 publications

(5 citation statements)

References 22 publications

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“…In this context, experimental information concerning the fuel distribution can provide additional insight into how the PVC impacts mixing and burning. Since the fuel itself is typically not easily accessible for laser-based imaging, the desired information can for example be derived by using PLIF applied to acetone vapor seeded into the flow, to characterize the fuelair mixing and flame stabilization processes in gas turbine model combustors [16][17][18]. In the paper [14], acetone PLIF measurements applied to the dual-swirl burner mentioned above showed that fuel and air are largely separated at the inlet of the combustion chamber, but are then strongly mixed by the PVC.…”

Section: Introductionmentioning

confidence: 99%

Time-resolved study of mixing and reaction in an aero-engine model combustor at increased pressure

Litvinov

Yoon

Noren

et al. 2021

Combustion and Flame

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Section: Introductionmentioning

confidence: 99%

Time-resolved study of mixing and reaction in an aero-engine model combustor at increased pressure

Litvinov

Yoon

Noren

et al. 2021

Combustion and Flame

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“…The distributions demonstrate that the turbulent mass and momentum transport took place in the circular mixing layer of the jet. Based on these distributions, it is possible to evaluate the components of turbulent viscosity tensor (10) and turbulent diffusivity coefficient according to Equations ( 11)-( 14).…”

Section: Flow Structure and Coherent Fluctuationsmentioning

confidence: 99%

“…Measurements of these quantities can be performed simultaneously by combining the PIV and PLIF methods. Moreover, the latter provides important information about the shape of chemical reaction zones in combustors [9,10]. However, detailed optical measurements for the real combustion chambers are often difficult due to a number of technical reasons.…”

Section: Introductionmentioning

confidence: 99%

Testing Basic Gradient Turbulent Transport Models for Swirl Burners Using PIV and PLIF

Savitskii

Lobasov

Sharaborin

et al. 2021

Fluids

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The present paper reports on the combined stereoscopic particle image velocimetry (PIV) and planar laser induced fluorescence (PLIF) measurements of turbulent transport for model swirl burners without combustion. Two flow types were considered, namely the mixing of a free jet with surrounding air for different swirl rates of the jet (Re = 5 × 103) and the mixing of a pilot jet (Re = 2 × 104) with a high-swirl co-flow of a generic gas turbine burner (Re = 3 × 104). The measured spatial distributions of the turbulent Reynolds stresses and fluxes were compared with their predictions by gradient turbulent transport models. The local values of the turbulent viscosity and turbulent diffusivity coefficients were evaluated based on Boussinesq’s and gradient diffusion hypotheses. The studied flows with high swirl were characterized by a vortex core breakdown and intensive coherent flow fluctuations associated with large-scale vortex structures. Therefore, the contribution of the coherent flow fluctuations to the turbulent transport was evaluated based on proper orthogonal decomposition (POD). The turbulent viscosity and diffusion coefficients were also evaluated for the stochastic (residual) component of the velocity fluctuations. The high-swirl flows with vortex breakdown for the free jet and for the combustion chamber were characterized by intensive turbulent fluctuations, which contributed substantially to the local turbulent transport of mass and momentum. Moreover, the high-swirl flows were characterized by counter-gradient transport for one Reynolds shear stress component near the jet axis and in the outer region of the mixing layer.

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“…Two-line or thermally-assisted OH PLIF can be used for the evaluation of temperature fields hot combustion products [39][40][41][42]. Since swirl-stabilized combustors for gaseous or liquid fuels are commonly used in gas turbines, the flow and flame for their models are intensively studied by using the PIV and OH PLIF methods [43][44][45]. There is also a growing interest in the optical diagnostics of syngas combustion in swirl-stabilized burners [21].…”

Section: Introductionmentioning

confidence: 99%

“…There are also a number of papers for dual swirlers of more sophisticated designs, e.g., LPP (lean premixing prevaporizing, [51,52]) and PERM (partially evaporated, rapidly mixed, [53,54]) injectors by Avio or so-called BIMER experimental setup [55,56]. There are also some studies for triple swirlers [57][58][59] and for realistic burners, like different lean premixed prevaporized injectors (see studies in cooperation with General Electric [18,20], Rolls-Royce [17,19,22,60], Jaxa [45], and other companies [61,62]) and lean premixed burners by Siemens [21,63].…”

Section: Introductionmentioning

confidence: 99%

On the Flow Structure and Dynamics of Methane and Syngas Lean Flames in a Model Gas-Turbine Combustor

et al. 2021

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The present paper compares the flow structure and flame dynamics during combustion of methane and syngas in a model gas-turbine swirl burner. The burner is based on a design by Turbomeca. The fuel is supplied through injection holes between the swirler blades to provide well-premixed combustion, or fed as a central jet from the swirler’s centerbody to increase flame stability via a pilot flame. The measurements of flow structure and flame front are performed by using the stereo particle image velocimetry and OH planar laser-induced fluorescence methods. The measurements are performed for the atmospheric pressure without preheating and for 2 atm with the air preheated up to 500 K. The flow Reynolds numbers for the non-reacting flows at these two conditions are 1.5 × 103 and 1.0 × 103, respectively. The flame dynamics are analyzed based on a high-speed OH* chemiluminescence imaging. It is found that the flame dynamics at elevated conditions are related with frequent events of flame lift-off and global extinction, followed by re-ignition. The analysis of flow structure via the proper orthogonal decomposition reveals the presence of two different types of coherent flow fluctuations, namely, longitudinal and transverse instability modes. The same procedure is applied to the chemiluminescence images for visualization of bulk movement of the flame front and similar spatial structures are observed. Thus, the longitudinal and transverse instability modes are found in all cases, but for the syngas at the elevated pressure and temperature the longitudinal mode is related to strong thermoacoustic fluctuations. Therefore, the present study demonstrates that a lean syngas flame can become unstable at elevated pressure and temperature conditions due to a greater flame propagation speed, which results in periodic events of flame flash-back, extinction and re-ignition. The reported data is also useful for the validation of numerical simulation codes for syngas flames.

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Study of a thermo-acoustic instability triggering in a low-swirl burner using simultaneous time-resolved acetone and OH-PLIF

Cited by 17 publications

References 22 publications

Time-resolved study of mixing and reaction in an aero-engine model combustor at increased pressure

Time-resolved study of mixing and reaction in an aero-engine model combustor at increased pressure

Testing Basic Gradient Turbulent Transport Models for Swirl Burners Using PIV and PLIF

On the Flow Structure and Dynamics of Methane and Syngas Lean Flames in a Model Gas-Turbine Combustor

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