Transient heat transfer between a turbulent lean partially premixed flame in limit cycle oscillation and the walls of a can type combustor

Shahi, Mina; Kok, Jacobus B.W.; Casado, Juan; Pozarlik, Artur Krzysztof

doi:10.1016/j.applthermaleng.2015.01.060

Cited by 18 publications

(9 citation statements)

References 25 publications

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“…A simple approach is by imposing wall temperature boundary conditions (Tay Wo Chong et al 2010;Palies et al 2011;Mercier et al 2014;Benard et al 2019) by following experimental measurements obtained on the combustion chamber surfaces (Brübach et al 2013). Alternative methods include a conjugate heat transfer approach (Bauerheim et al 2015), or using a fully coupled LES/heat conduction approach, where an additional solver is used to compute the temperature distribution for the solid structure of the combustion chamber (Shahi et al 2015;Ghani et al 2016;Miguel-Brebion et al 2016;Kraus et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Modelling Heat Loss Effects in the Large Eddy Simulation of a Lean Swirl-Stabilised Flame

Massey

Chen

Swaminathan

2020

Flow Turbulence Combust

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The flame in a gas turbine model combustor close to blow-off is studied using large eddy simulation with the objective of investigating the sensitivity of including different heat loss effects within the modelling. A presumed joint probability density function approach based on the mixture fraction and progress variable with unstrained flamelets is used. The normalised enthalpy is included in the probability density function to account for heat loss within the flame. Two simulations are presented that use fixed temperature boundary conditions, and use adiabatic and non-adiabatic formulations of the combustion model. The results are compared against the previous fully adiabatic case and experimental data. The statistics for the simulations are similar to the results obtained from the fully adiabatic case. Improved statistics are obtained for the temperature in the near-wall regions. The non-adiabatic flamelet case shows the average reaction rate values at the flame root are approximately 50% smaller in comparison to the adiabatic flamelet cases. This causes the lift-off height to be overestimated. The time series of the lift-off height and the volume integrated heat release rate show that including non-adiabatic flamelets causes the flame to be highly unstable. A higher enthalpy deficit is seen in the near-field regions when the flame root is not present and experiencing some lift-off, suggesting that the flame is more dynamic when including heat loss.

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Section: Introductionmentioning

confidence: 99%

Modelling Heat Loss Effects in the Large Eddy Simulation of a Lean Swirl-Stabilised Flame

Massey

Chen

Swaminathan

2020

Flow Turbulence Combust

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“…Several methodologies, with varying degrees of resolution and corresponding computational effort, are available. The unsteady Reynolds-averaged Navier-Stokes (URANS) method requires relatively low computational effort; it has been used by many researchers, for example Armitage et al (2006) or Shahi et al (2015), and is popular in the industrial research community. Large eddy simulation (LES), used for example by Franzelli et al (2012) or Tay-Wo-Chong & Poplifke (2013), is more accurate, but requires high-performance computing.…”

Section: Green's Function Approach To Predicting Instabilities In Commentioning

confidence: 99%

A Green’s function approach to the rapid prediction of thermoacoustic instabilities in combustors

Bigongiari

Heckl

2016

J. Fluid Mech.

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The prediction of thermoacoustic instabilities is fundamental for combustion systems such as domestic burners and industrial gas turbine engines. High-amplitude pressure oscillations cause thermal and mechanical stress to the equipment, leading to premature wear or even critical damage. In this paper we present a new approach to produce nonlinear (i.e. amplitude-dependent) stability maps of a combustion system as a function of various parameters. Our approach is based on the tailored Green's function of the combustion system, which we calculate analytically. To this end, we assume that the combustor is one-dimensional, and we describe its boundary conditions through reflection coefficients. The heat release is modelled by a generalised nτ law. This includes a direct-feedback term in addition to the usual time-lag term; moreover, its parameters (time lag, coupling coefficients) depend on the oscillation amplitude. The model provides new insight into the physical mechanism of the feedback between heat release rate and acoustic perturbations. It predicts the key nonlinear features of the thermoacoustic feedback, such as limit cycles, bistability and hysteresis. It also explains the frequency shift in the acoustic modes.

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“…However, as illustrated by the simulation of the LIMOUSINE burner performed by Shahi et al [17] , taking into account the heat transfer between the flow and the solid parts of the combustion chamber can significantly increase the accuracy of the results. Another example is the study by Kraus et al [18] , who compared an adiabatic LES and an LES with basic modeling of heat transfer between fluid and solid material.…”

Section: Introductionmentioning

confidence: 99%

“…• Type 4: Fully coupled LES/heat conduction solver in the combustor walls: the whole combustor solid structure is also meshed and the temperature within the solid structure is computed by a solver coupled with the LES flow solver [17,[33][34][35] .…”

Section: Introductionmentioning

confidence: 99%

Coupling heat transfer and large eddy simulation for combustion instability prediction in a swirl burner

Kraus

Selle

Poinsot

2018

Combustion and Flame

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in : http://oatao. Large eddy simulations (LES) of combustion instabilities are often performed with simplified thermal wall boundary conditions, typically adiabatic walls. However, wall temperatures directly affect the gas temperatures and therefore the sound speed field. They also control the flame itself, its stabilization characteristics and its response to acoustic waves, changing the flame transfer functions (FTFs) of many combustion chambers. This paper presents an example of LES of turbulent flames fully coupled to a heat conduction solver providing the temperature in the combustor walls. LES results obtained with the fully coupled approach are compared to experimental data and to LES performed with adiabatic walls for a swirled turbulent methane/air burner installed at Engler-Bunte-Institute, Karlsruhe Institute of Technology and German Aerospace Center (DLR) in Stuttgart. Results show that the fully coupled approach provides reasonable wall temperature estimations and that heat conduction in the combustor walls strongly affects both the mean state and the unstable modes of the combustor. The unstable thermoacoustic mode observed experimentally at 750 Hz is captured accurately by the coupled simulation but not by the adiabatic one, suggesting that coupling LES with heat conduction solvers within combustor walls may be necessary in other configurations in order to capture flame dynamics.

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Transient heat transfer between a turbulent lean partially premixed flame in limit cycle oscillation and the walls of a can type combustor

Cited by 18 publications

References 25 publications

Modelling Heat Loss Effects in the Large Eddy Simulation of a Lean Swirl-Stabilised Flame

Modelling Heat Loss Effects in the Large Eddy Simulation of a Lean Swirl-Stabilised Flame

A Green’s function approach to the rapid prediction of thermoacoustic instabilities in combustors

Coupling heat transfer and large eddy simulation for combustion instability prediction in a swirl burner

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