Numerical Simulation of Combustion Induced Noise Using LES and Computational Aeroacoustics

2010 ◽  
Author(s):  
Christian Klewer ◽  
Jens Kuehne ◽  
Johannes Janicka ◽  
Oliver Kornow
Keyword(s):  
Reacting Flows ◽  
Reactive Flow ◽  
Noise Emission ◽  
Sound Sources ◽  
Jet Flame ◽  
Linearized Euler Equations ◽  
Thermoacoustic Instabilities ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Aeroacoustic Simulation

Many technical combustion devices are susceptible to thermoacoustic instabilities. In this work, the noise emission by a turbulent jet flame is analyzed by means of a hybrid LES/CAA (Large Eddy Simulation/Computational Aero Acoustics) approach as a first step towards a numerical investigation of combustion instability. The hybrid LES/CAA approach is based on a LES of the reactive flow utilizing a low Mach number formulation. Within the CAA part of the simulations, linearized Euler equations (LEE) are solved. A simplified formulation to describe the thermoacoustic sound sources is extracted from the reactive LES. For the present study, the CFD code FASTEST is coupled with the aeroacoustic simulation tool PIANO. The two solvers are combined to a single tool for the description of the acoustics of reacting flows. Both codes make use of geometry flexible grids enabling the simulation of complex geometries commonly used within technical combustion systems.

Large eddy simulation of a supersonic lifted jet flame in the high-enthalpy coflows

2021 ◽  
Author(s):  
Chaoyang Liu ◽  
Ning Wang ◽  
Kai Yang ◽  
Dongpeng Jia ◽  
Yu Pan
Keyword(s):  
Large Eddy Simulation ◽  
Jet Flame ◽  
High Enthalpy ◽  
Eddy Simulation ◽  
Large Eddy

Numerical Study on Air-Reed Instruments With LES

2011 ◽  
Author(s):  
Kin’ya Takahashi ◽  
Masataka Miyamoto ◽  
Yasunori Ito ◽  
Toshiya Takami ◽  
Taizo Kobayashi ◽  
...  
Keyword(s):  
Numerical Study ◽  
Sound Field ◽  
Acoustic Analogy ◽  
Empirical Theory ◽  
Sound Sources ◽  
Aerodynamic Sound ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Semi Empirical ◽  
2D And 3D

The acoustic mechanisms of 2D and 3D edge tones and a 2D small air-reed instrument have been studied numerically with compressible Large Eddy Simulation (LES). Sound frequencies of the 2D and 3D edge tones obtained numerically change with the jet velocity well following Brown’s semi-empirical equation, while that of the 2D air-reed instrument behaves in a different manner and obeys the semi-empirical theory, so called Cremer-Ising-Coltman theory. We have also calculated aerodynamic sound sources for the 2D edge tone and the 2D air-reed instrument relying on Ligthhill’s acoustic analogy and have discussed similarities and differences between them. The sound source of the air-reed instrument is more localized around the open mouth compared with that of the edge tone due to the effect of the strong sound field excited in the resonator.

Large-Eddy Simulation of Reacting Turbulent Flows in Complex Geometries

2005 ◽  
Vol 73 (3) ◽  
pp. 374-381 ◽  
Author(s):  
K. Mahesh ◽  
G. Constantinescu ◽  
S. Apte ◽  
G. Iaccarino ◽  
F. Ham ◽  
...  
Keyword(s):  
Large Eddy Simulation ◽  
Gas Turbine ◽  
Turbulent Flows ◽  
Reacting Flows ◽  
Gas Turbine Combustor ◽  
Turbine Engine ◽  
Progress Variable ◽  
Eddy Simulation ◽  
Variable Approach ◽  
Large Eddy

Large-eddy simulation (LES) has traditionally been restricted to fairly simple geometries. This paper discusses LES of reacting flows in geometries as complex as commercial gas turbine engine combustors. The incompressible algorithm developed by Mahesh et al. (J. Comput. Phys., 2004, 197, 215–240) is extended to the zero Mach number equations with heat release. Chemical reactions are modeled using the flamelet/progress variable approach of Pierce and Moin (J. Fluid Mech., 2004, 504, 73–97). The simulations are validated against experiment for methane-air combustion in a coaxial geometry, and jet-A surrogate/air combustion in a gas-turbine combustor geometry.

scholarly journals Large-eddy simulation of pulverized coal jet flame – Effect of oxygen concentration on NOx formation

Fuel ◽  
2015 ◽  
Vol 142 ◽  
pp. 152-163 ◽  
Author(s):  
Masaya Muto ◽  
Hiroaki Watanabe ◽  
Ryoichi Kurose ◽  
Satoru Komori ◽  
Saravanan Balusamy ◽  
...  
Keyword(s):  
Large Eddy Simulation ◽  
Oxygen Concentration ◽  
Pulverized Coal ◽  
Nox Formation ◽  
Jet Flame ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Effect Of Oxygen

An Assessment of the Implicit Non-Iterative PISO Solution Procedure for the Prediction of Combustor Performance

2019 ◽  
Author(s):  
Megan Karalus ◽  
Niveditha Krishnamoorthy ◽  
Bob Reynolds ◽  
George Mallouppas
Keyword(s):  
Large Eddy Simulation ◽  
Gas Turbine ◽  
Solution Procedure ◽  
Reacting Flows ◽  
Small Time ◽  
Accurate Prediction ◽  
Simple Method ◽  
Performance Improvements ◽  
Eddy Simulation ◽  
Large Eddy

Abstract Large Eddy Simulation (LES) of gas turbine combustors has gained traction as a key tool in the design process. Accurate prediction of the multiphysics of reacting flows — evaporating fuel spray, turbulent mixing, turbulent chemistry interaction, radiation, and conjugate heat transfer to name a few — is key to the accurate prediction of combustor performance. The overall solution time for a standard LES simulation on an industrial system can be burdensome because of the small time and length scales required to capture the aforementioned multiphysics to an acceptable level. Any performance improvements are therefore welcomed. In this paper, we compare the implicit non-iterative PISO solution procedure with the implicit iterative SIMPLE method for the Large Eddy Simulation of a Honeywell combustor using the commercial software, Simcenter STAR-CCM+ v13.04. Time averaged simulation results are validated against rig data. Results show that the PISO solution method provides results which are similar to those found using the SIMPLE method, and accurate when compared to rig data, but at up to a 3.4X speed-up for this liquid fueled gas turbine combustor.

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