Large-Eddy Simulation of Single-Element Gas-Centered Swirl-Coaxial Injectors for Combustion Stability Prediction

2017 ◽  
Author(s):  
Clancy Umphrey ◽  
Matthew E. Harvazinski ◽  
Stephen A. Schumaker ◽  
Venke Sankaran
Keyword(s):  
Large Eddy Simulation ◽  
Combustion Stability ◽  
Single Element ◽  
Stability Prediction ◽  
Eddy Simulation ◽  
Large Eddy

Application of a Nonadiabatic Flamelet/Progress-Variable Approach to Large-Eddy Simulation of H2/O2 Combustion Under a Pressurized Condition

2017 ◽  
Vol 139 (12) ◽  
Author(s):  
Akihiro Kishimoto ◽  
Hideki Moriai ◽  
Kenichiro Takenaka ◽  
Takayuki Nishiie ◽  
Masaki Adachi ◽  
...  
Keyword(s):  
Large Eddy Simulation ◽  
Single Element ◽  
Progress Variable ◽  
Eddy Simulation ◽  
Variable Approach ◽  
Large Eddy ◽  
Pressurized Combustion ◽  
Reactive Radicals ◽  
High Concentrations ◽  
Supercritical Combustion

A new nonadiabatic procedure of the flamelet/progress-variable approach (NA-FPV approach) is proposed, and the validity is assessed by performing a large eddy simulation (LES) employing the NA-FPV approach for an H2/O2 combustion field in a single element coaxial combustor under a pressurized condition. The results show that the LES employing the NA-FPV approach can successfully predict the heat flux and capture the effects of heat loss through the cooled walls on the combustion characteristics. This procedure is quite useful especially for the numerical simulations of combustion fields with high temperatures, where there remain reactive radicals (e.g., OH, CH) with high concentrations, such as pressurized combustion, supercritical combustion, and oxygen combustion.

Large-Eddy Simulation of High-Frequency Combustion Instability in a Single-Element Atmospheric Combustor

2016 ◽  
Vol 32 (3) ◽  
pp. 628-645 ◽  
Author(s):  
Shingo Matsuyama ◽  
Dan Hori ◽  
Taro Shimizu ◽  
Shigeru Tachibana ◽  
Seiji Yoshida ◽  
...  
Keyword(s):  
Large Eddy Simulation ◽  
High Frequency ◽  
Combustion Instability ◽  
Single Element ◽  
Eddy Simulation ◽  
Large Eddy

Large-Eddy Simulation of Turbulent Combustion in Multi Combustors for L30A Gas Turbine Engine

2015 ◽  
Author(s):  
Kohshi Hirano ◽  
Yoshiharu Nonaka ◽  
Yasuhiro Kinoshita ◽  
Masaya Muto ◽  
Ryoichi Kurose
Keyword(s):  
Numerical Analysis ◽  
Large Eddy Simulation ◽  
Swirling Flow ◽  
Flame Temperature ◽  
Computational Cost ◽  
Combustion Stability ◽  
Outlet Temperature ◽  
Eddy Simulation ◽  
Variable Approach ◽  
Large Eddy

When designing a combustor, numerical analysis should be used to effectively predict different performances, such as flame temperature, emission, and combustion stability. However, even with the use of numerical analysis, several problems cannot be solved by investigating single combustors because, in an actual engine, interactions occur between multiple combustors. Therefore, to evaluate the detailed phenomenon in an actual combustor, the interactions between all combustors should be considered in any numerical analysis. On the other hand, a huge amount of computational cost is required for this type of analysis. Here a large-eddy simulation employing a flamelet/progress variable approach is applied to the numerical analysis of industrial combustors. The combustor used for this study is the L30A from Kawasaki Heavy Industries, Ltd. Computations are conducted with a supercomputer (referred to as the “K-computer”) in the RIKEN Advanced Institute for Computational Science. All combustors in the L30A engine (from the compressor outlet to the turbine inlet) are simulated, including the fuel manifold. This engine has eight can combustors that are connected through the fuel manifold and compressed air housing unit. The total number of elements is approximately 140 million. The flow patterns for each combustor are similar in all cans. A swirling flow from the main burner is formed and accelerated by the supplemental burner. There is a high-temperature region before the supplemental burner. The flow field and temperature distribution in an actual combustor interacting with other combustor cans are simulated adequately. The mass flow rate of the air and those of the fuels are distributed equally for each can. Therefore, the outlet temperature difference for each can is also very small.

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