A test of an engineering model of premixed turbulent combustion

Karpov, V. P.; Lipatnikov, Andrei; imont, Vladimir

doi:10.1016/s0082-0784(96)80223-2

Cited by 77 publications

(30 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The premixed combustion model equation in terms of the progress variable and the rst results of combustion numerical simulations was presented in 5]. References 6]-10] contain mainly results of this combustion model validation using di erent standard experimental data in spherical bombs with arti cial turbulisation [5][6][7][8], in a channel at high velocity combustion 9] and in industrial burners 10].…”

Section: Introductionmentioning

confidence: 99%

Gas premixed combustion at high turbulence. Turbulent flame closure combustion model

Zimont¹

2000

Experimental Thermal and Fluid Science

228

128

View full text Add to dashboard Cite

This paper is devoted to analyze the special class of turbulent premixed ames that we call intermediate steady propagation (ISP) ames. These ames are common to industrial premixed combustion chambers which operate at intensive turbulence when velocity pulsations are signi cantly higher than the amelet combustion velocity. They are characterized by a practically constant turbulent combustion velocity, controlled by turbulence, chemistry and molecular processes, and by an increasing ame width, controlled mainly by turbulent di usion.The main content of this work is a description of physical backgrounds and outcome of the original asymptotical (i.e., valid at high Re and Da numbers) premixed combustion model, that, from a methodological point of view, is close to Kolmogorov analysis of developed turbulence at high Re numbers. Our analysis starts from the thickened and strongly wrinkled amelets combustion mechanism. Quantitative results for this model are based on the Kolmogorov assumption of the equilibrium ne-scale turbulence and on additional assumption of the universal small-scale structure of the wrinkled amelet sheet. From this background it is possible to deduce formulas for the thickened amelets parameters and the amelet sheet area and hence the turbulent combustion velocity of the premixed ame. These formulas are used for the closure of the combustion equation written in terms of a progress variable leading to the so called turbulent ame closure (TFC) model for the numerical simulation of ISP ames. Consistent to the ISP ames, in this work the concept of countergradient transport phenomenon in premixed combustion is analyzed.

show abstract

Section: Introductionmentioning

confidence: 99%

Gas premixed combustion at high turbulence. Turbulent flame closure combustion model

Zimont¹

2000

Experimental Thermal and Fluid Science

228

128

View full text Add to dashboard Cite

show abstract

“…Curves have been obtained using (9). and validated by the present author [35][36][37]. As reviewed elsewhere [3,27], the model is successfully used by a number of different groups to simulate various turbulent flames.…”

Section: Discussionmentioning

confidence: 86%

“…As pointed out elsewhere [39], the model tested by Bray et al [21] differed substantially from the model developed and validated by Zimont and Lipatnikov [35][36][37]. In particular, the latter model provides a joint closure of the sum of the transport and reaction terms in the following well-known [13] balance equation:…”

Section: Discussionmentioning

confidence: 92%

Burning Rate in Impinging Jet Flames

Lipatnikov

2011

Journal of Combustion

View full text Add to dashboard Cite

A method for evaluating burning velocity in premixed turbulent flames stabilized in divergent mean flows is quantitatively validated using numerical approximations of measured axial profiles of the mean combustion progress variable, mean and conditioned axial velocities, and axial turbulent scalar flux, obtained by four research groups from seven different flames each stabilized in an impinging jet. The method is further substantiated by analyzing the combustion progress variable balance equation that is yielded by the extended Zimont model of premixed turbulent combustion. The consistency of the model with the aforementioned experimental data is also demonstrated.

show abstract

“…where A = 0.52 is the model constant, u ′ is the root-mean-square velocity, α is the unburnt thermal diffusivity, l t is the turbulence length scale, τ t = l t /u [27], [72] did not incorporate chemical kinetics but assumed that the influence of chemistry on a turbulent premixed flame may be qualitatively approximated the correct laminar flame speed, which depends on the chemistry. However, in the present study a simple combination of TFC and the β-PDF approach with the equilibrium chemistry assumption [64], as implemented in the CFD code Ansys Fluent (AF), was used for taking into account chemical effects.…”

Section: Turbulent Flame Closure (Tfc) Modelmentioning

confidence: 99%

Reynolds-Averaged, Scale-Adaptive and Large-Eddy Simulations of Premixed Bluff-Body Combustion Using the Eddy Dissipation Concept

Lysenko¹,

Ertesvåg

2017

Flow Turbulence Combust

View full text Add to dashboard Cite

A lean premixed propane/air bluff-body stabilized flame (Volvo test rig) is calculated using the Scale-Adaptive Simulation turbulence model (SAS) and Large-Eddy simulations (LES) as well as the conventional Reynoldsaveraged approach (RAS). RAS and SAS are closed by the standard k-ǫ and the k-ω Shear Stress Transport (SST) turbulence models, respectively. The conventional Smagorinsky and the k-equation sub-grid scales models are used for the LES closure. Effects of the sub-grid scalar flux modeling using the classical gradient hypothesis and Clark's tensor diffusivity closures both for the inert and reactive LES flows are discussed. The Eddy Dissipation Concept (EDC) is used for the turbulence-chemistry interaction. It assumes that molecular mixing and the subsequent combustion occur in the 'fine structures' (smaller dissipative eddies, which are close to the Kolmogorov scales). Assuming the full turbulence energy cascade, the characteristic length and velocity scales of the 'fine structures' are evaluated using different turbulence models (RAS, SAS and LES). The finite-rate chemical kinetics is taken into account by treating the 'fine structures' as constant pressure and adiabatic homogeneous reactors, calculated as a system of ordinary-differential equations (ODEs) described by a Perfectly Stirred Reactor (PSR) concept. Several further enhancements to model the PSRs are proposed, including a new Livermore Solver (LSODA) for integrating stiff ODEs and a new correction to calculate the PSR time scales. All models have been implemented as a stand-alone application edcPisoFoam based on the OpenFOAM technology. Additionally, several RAS calculations were performed using the Turbulence Flame Speed Closure model in Ansys Fluent to assess effects of the heat losses by modeling the conjugate heat transfer between the bluff-body and the reactive flow. Effects of the turbulence Schmidt number on RAS results are discussed as well. Numerical results are compared with available experimental data. Reasonable consistency between experimental data and numerical results provided by RAS, SAS and LES is observed. In general, there is satisfactory agreement between present LES-EDC simulations, numerical results by other authors and measurements without any major modification to the EDC closure constants, which gives a quite reasonable indication on the adequacy and accuracy of the method and its further application for turbulent premixed combustion simulations.

show abstract

A test of an engineering model of premixed turbulent combustion

Cited by 77 publications

References 18 publications

Gas premixed combustion at high turbulence. Turbulent flame closure combustion model

Gas premixed combustion at high turbulence. Turbulent flame closure combustion model

Burning Rate in Impinging Jet Flames

Reynolds-Averaged, Scale-Adaptive and Large-Eddy Simulations of Premixed Bluff-Body Combustion Using the Eddy Dissipation Concept

Contact Info

Product

Resources

About