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Numerical Investigation of Methane/Hydrogen/Air Partially Premixed Flames in the SGT-800 Burner Fitted to a Combustion Rig

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Abstract

The Siemens SGT-800 3rd generation DLE burner fitted to an atmospheric combustion rig has been numerically investigated. Pure methane and methane enriched by 80 vol% hydrogen flames have been considered. A URANS (Unsteady Reynolds Averaged Navier-Stokes) approach was used in this study along with the k − ω SST and the k − ω SST-SAS models for the turbulence transport. The chemistry is coupled to the turbulent flow simulations by the use of a laminar flamelet library combined with a presumed PDF. The effect of the mesh density in the mixing and the flame region and the effect of the turbulence model and reaction rate model constant are first investigated for the methane/air flame case. The results from the k − ω SST-SAS along with flamelet libraries are shown to be in excellent agreement with experimental data, whereas the k − ω SST model is too dissipative and cannot capture the unsteady motion of the flame. The k − ω SST-SAS model is used for simulation of the 80 vol% hydrogen enriched flame case without further adjusting the model constants. The global features of the hydrogen enrichment are very well captured in the simulations using the SST-SAS model. With the hydrogen enrichment the time averaged flame front location moves upstream towards the burner exit nozzle. The results are consistent with the experimental observations. The model captures the three dominant low frequency unsteady motion observed in the experiments, indicating that the URANS/LES hybrid model indeed is capable of capturing complex, time dependent, features such as an interaction between a PVC and the flame front.

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Abbreviations

CFD:

Computational Fluid Dynamics

CFL:

Courant-Friedrichs-Lewy condition

DLE:

Dry Low Emissions

FFT:

Fast Fourier Transform

LES:

Large Eddy Simulation

NOx:

Nitric Oxides

PDF:

Probability Density Function

PLIF:

Planar Laser Induced Fluorescence

RANS:

Reynolds Averaged Navier Stokes

RMS:

Root Mean Square

RSM-SSG:

Reynolds Stress Model - Speziale Sarkar Gatski

RSM-LRR:

Reynolds Stress Model - Launder Reece Rodi

URANS:

Unsteady Reynolds Averaged Navier Stokes

SAS:

Scale Adaptive Simulation

SST:

Shear Stress Transfer

PVC:

Precessing Vortex Core

c :

Reaction progress variable

c′′:

Variance of reaction progress

c μ :

Model constant in k − ω SST model

k :

Turbulent kinetic energy

p :

Pressure

t :

Time

u i :

Velocity vector

\({u_{L}^{0}}\) :

Unstrained laminar burning velocity

u t :

Turbulent burning velocity

x :

Axial distance to burner exit nozzle

x i :

Cartesian coordinate vector

C :

Model constant in k − ω SST-SAS model

C S :

Model constant in k − ω SST-SAS model

C R :

Reaction rate constant

F 1 :

Blending functiom in k − ω SST model

L :

Length scale of modelled turbulence

L v K :

von Karman Length scale

P :

Production term

P S A S :

Production term in SAS model

R :

Mixing tube radius

S :

Scalar invariant of the strain rate tensor

S i j :

Strain rate tensor

\(\overline {S_{c}}\) :

Mean reaction rate

S t :

Strouhal number

V K :

Kolmogorov velocity

Y i :

Species mass fraction

Z :

Mixture fraction

Z′′:

Variance of mixture fraction

α :

Model constant in k − ω SST model

β :

Model constant in k − ω SST model

ε :

Dissipation rate of turbulent kinetic energy

\(\varepsilon _{Z_{st}}\) :

Scalar dissipation rate

ν t :

Turbulent eddy viscosity

ν :

Kinematic viscosity

ω :

Turbulent eddy frequency

ρ :

Density

ρ u :

Density of unburnt mixture

σ :

Schmidt number

ζ 2 :

Model constant in k − ω SST model

Δ:

Local mesh length scale

Ω C V :

Local control volume size

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Authors and Affiliations

  1. Siemens Industrial Turbomachinery AB, 61283, Finspong, Sweden

    Daniel Moëll & Daniel Lörstad

  2. Department of Energy Sciences, Lund University, PO Box 118, 221 00, Lund, Sweden

    Daniel Moëll & Xue-Song Bai

Authors
  1. Daniel Moëll
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  2. Daniel Lörstad
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  3. Xue-Song Bai
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Correspondence to Daniel Moëll.

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Moëll, D., Lörstad, D. & Bai, XS. Numerical Investigation of Methane/Hydrogen/Air Partially Premixed Flames in the SGT-800 Burner Fitted to a Combustion Rig. Flow Turbulence Combust 96, 987–1003 (2016). https://doi.org/10.1007/s10494-016-9726-5

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  • DOI: https://doi.org/10.1007/s10494-016-9726-5

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