Spontaneous Raman Scattering: from Atmospheric CH4/air Diffusion Flame to 55 Bar Jet-A-Fueled, Aviation Gas Turbine Combustor

2002 ◽  
Author(s):  
Randy Locke ◽  
Yolanda Hicks ◽  
Wim De Groot ◽  
Robert Anderson
Keyword(s):  
Raman Scattering ◽  
Gas Turbine ◽  
Diffusion Flame ◽  
Gas Turbine Combustor ◽  
Spontaneous Raman Scattering ◽  
Air Diffusion

Large-Eddy Simulation With a New Flamelet Model for Partially Premixed Combustion in a Gas-Turbine Combustor

2017 ◽  
Author(s):  
Keisuke Tanaka ◽  
Tomonari Sato ◽  
Nobuyuki Oshima ◽  
Jiun Kim ◽  
Yusuke Takahashi ◽  
...  
Keyword(s):  
Gas Turbine ◽  
Diffusion Flame ◽  
Premixed Combustion ◽  
Combustion Model ◽  
Gas Turbine Combustor ◽  
Flamelet Model ◽  
Eddy Simulation ◽  
Partially Premixed Combustion ◽  
Large Eddy ◽  
Partially Premixed

Turbulent combustion flows in the partially premixed combustion field of a dry low-emission gas-turbine combustor were investigated numerically by large-eddy simulation with a 2-scalar flamelet model. Partially premixed combustion was modelled with 2-scalar coupling based on the conservative function of the mixture fraction and the level set function of the premixed flame surface; the governing equations were then used to calculate the gas temperature in the combustion field with flamelet data. A new combustion model was introduced by defining a nondimensional equilibrium temperature to permit the calculation of adiabatic flame temperatures in the combustion field. Furthermore, a conventional G-equation was modified to include spatial gradient terms for the adiabatic flame temperature to facilitate smooth propagation of a burnt-state region in a predominantly diffusion flame. The effect of flame curvature was adjusted by means of an arbitrary parameter in the equation. The simulation results were compared with those from an experiment and a conventional model. Qualitative comparisons of the instantaneous flame properties showed a dramatic improvement in the new combustion model. Moreover, the experimental outlet temperature agreed well with that predicted by the new model. The model can therefore reproduce the propagation of a predominantly diffusion flame in partially premixed combustion.

Low NOx Combustor for Automotive Ceramic Gas Turbine: Conceptual Design

1991 ◽  
Author(s):  
Masafumi Sasaki ◽  
Hirotaka Kumakura ◽  
Daishi Suzuki
Keyword(s):  
Gas Turbine ◽  
Conceptual Design ◽  
Droplet Size ◽  
Diffusion Flame ◽  
Combustion Zone ◽  
Gas Turbine Combustor ◽  
Promising Candidate ◽  
Fine Droplet ◽  
Lean Combustion ◽  
Ratio Range

Three low NOx combustors, i.e. a lean premixing combustor, a rich-lean two stage combustor and a lean diffusion flame combustor, were tested in order to find out a suitable combustion concept for an automotive ceramic gas turbine combustor. The prevaporization-premixing lean combustion was proposed as the most promising candidate to meet Japanese 10 mode regulation for gasoline passenger car. The required conditions for the uniform premixture formation in the prevaporization-premixing tube were achieved by a fine droplet size atomizer and by means of swirl and turbulent generator. Air ratio range, air loading and other dimension criteria in the lean primary combustion zone were also proposed in the present paper.

Effect of Exhaust Cleanup Systems on Gas Turbine Combustor Selection

2003 ◽  
Author(s):  
Mario DeCorso ◽  
David L. Moen ◽  
Paul W. Pillsbury
Keyword(s):  
Gas Turbine ◽  
Diffusion Flame ◽  
Gas Turbines ◽  
Jet Engines ◽  
Gas Turbine Combustor ◽  
Turbine Plant ◽  
Fuel Flexibility ◽  
Gas Turbine Plant ◽  
Co Reduction ◽  
Reduction Catalysts

Diffusion flame combustors have served the gas turbine industry well since the invention of jet engines in the 1930’s. They provided fuel flexibility and the diffusion flame process gave the designer many options. Recently for heavy-duty land gas turbines, the need to reduce NOx emissions has led to the introduction of premixed combustor designs (Dry Low NOx - DLN) that have reduced fuel flexibility, operating range and reliability. With the increasing use and availability of Exhaust Cleanup Systems (EXCLUS) such as SCR and CO reduction catalysts, new gas turbine plant schemes that use diffusion flame combustors are back in the picture. This paper proposes a number of technique combinations that could achieve low NOx targets using diffusion flame combustors.

Experimental investigation of the stability of a turbulent diffusion flame in a gas turbine combustor

Energy ◽  
2018 ◽  
Vol 157 ◽  
pp. 904-913 ◽  
Author(s):  
Syed A. Said ◽  
Mansur Aliyu ◽  
Medhat A. Nemitallah ◽  
Mohamed A. Habib ◽  
Ibrahim B. Mansir
Keyword(s):  
Experimental Investigation ◽  
Gas Turbine ◽  
Diffusion Flame ◽  
Turbulent Diffusion ◽  
Gas Turbine Combustor ◽  
Turbulent Diffusion Flame ◽  
The Stability

Spectral and Timeresolved Radiation Measurements in a Model Gas Turbine Combustor

1994 ◽  
Author(s):  
R. Koch ◽  
W. Krebs ◽  
R. Jeckel ◽  
B. Ganz ◽  
S. Wittig
Keyword(s):  
Gas Turbine ◽  
Three Dimensional ◽  
Reacting Flow ◽  
Gas Turbine Combustor ◽  
Data Set ◽  
Time Resolved ◽  
Model Gas Turbine Combustor ◽  
Air Diffusion ◽  
First Time ◽  
Radiation Measurements

In the context of an extensive experimental investigation of the turbulent, reacting flow in a model gas turbine combustor, the radiation emitted by the confined three-dimensional turbulent propane/air diffusion-flame has been studied. The present study comprises for the first time spectral and time-resolved measurements of the radiative intensity at different axial locations including the reaction zone, the mixing zone and the exit of the model combustor. The radiation measurements are presented together with measurements and CFD-calculations characterizing the reacting flow field. This data set is well suited for the validation of CFD-calculations including radiative heat transfer and also for studying the interaction between turbulence and radiation.

scholarly journals Design and Operation of Low-NOx Combustors With Medium Heating Value, Coal-Derived Gas

1980 ◽  
Author(s):  
J. R. Grant ◽  
T. E. Holladay ◽  
F. H. Boenig ◽  
R. L. Duncan
Keyword(s):  
Gas Turbine ◽  
Diffusion Flame ◽  
Electrical Power ◽  
Water Injection ◽  
Attractive Alternative ◽  
Nox Emissions ◽  
Gas Turbine Combustor ◽  
Heating Value ◽  
Alternative Means ◽  
High Concentrations

Industrial turbines fired on medium heating value (MHV) gas (nominally 300 Btu/scf) synthesized from coal offer an attractive alternative means of producing electrical power in the future. Peak flame temperatures resulting from combustion of this MHV gas in conventional diffusion flame combustors may be comparable to those of natural gas, yielding undesirably high concentrations of NOx. This paper describes an EPRI-sponsored program conducted to demonstrate a MHV gas turbine combustor capable of meeting EPA NOx requirements without water injection. Program objectives were to design, fabricate, and test three MHV combustor configurations and to demonstrate NOx emissions concentrations of 15 ppmv (dry basis) or less at a burner inlet pressure of 1.27 atm: Design of the combustors was based on a lean-premix fuel metering concept. Tests were conducted in a single-can combustor rig at simulated engine conditions ranging from 40 to 125 percent of engine baseload (74 MW).

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