Institut für Technische Verbrennung

Institut für Technische Verbrennung Webseite

Projekts:

Bhuvaneswaran Manickam

To reduce the pollutants such as NOx, CO, soot, and unburned hydrocarbons (UHC) according to the current emission standards, ultra lean combustion technique is employed in gas turbine and internal combustion engine applications. But lean premixed flames are prone to instability, extinction and lean blowout limits. Moreover, the addition of hydrogen into hydrocarbon fuels increases burning velocity, flame stability, resistance to stretch and extinction limit. Due to high preferential diffusive characteristics of hydrogen, the two-component fuel/air mixture yields a stabilized flame even under ultra lean conditions, for overall equivalence ratio as low as 0.4. There have been several experimental works carried out to understand burning characteristics of hydrogen enriched flames. It was found that hydrogen enrichment increases molecular OH and H radicals, which is mainly used for converting CO into CO₂ in the flame front. Also, an increase of flame surface area due to thermo-diffusive instability is observed. In the current ongoing research, the hydrogen enriched flame is modeled by using the Algebraic Flame Surface Wrinkling (AFSW) [Muppla, Dinkelacker, 2005] reaction model with the newly developed subclosure to incorporate the hydrogen effects in hydrocarbon flames. The subclosure is developed in terms of effective Lewis number [Dinkelacker, Manickam, 2010] of the mixture and validated for a set of three experimental conditions: for
variation of equivalence ratio (\Phi), hydrogen concentration (H₂), and pressure (p). Many other subclosures based on asymptotic analysis are also validated by incorporating into the AFSW reaction model and compared with the same experimental predictions. 

Journal Publications:

• Dinkelacker, F, Manickam, B., Muppala, S.P.R., 2008. Modeling and Simulation of Lean Premixed Turbulent Methane/Hydrogen/Air Flames with an Effective Lewis Number Approach. Combustion and Flame (Article No: 7620).
• Manickam, B., Muppala, S.P.R., Dinkelacker, F., 2010. Modeling and Simulation of Two-Component Lean Fuel/Air Flames using Mean Local Burning Velocity and Leading Edge Concept Combustion Science and Technology (review).
• Manickam, B., Muppala, S.P.R., Dinkelacker, F., 2010. Numerical Prediction of CH₄/H₂/Air Low-Swirl Flames at Atmospheric Conditions.  International Journal of Hydrogen Energy (to be sumbitted).

Oral Conference Presentations:

• Manickam, B.,Muppala S.P.R, Dinkelacker, F., 2009, Numerical prediction of CH₄/H₂/Air$ low-swirl flames at gasturbine conditions, 24th Deutscher Flammentag 2009, Bochum, Germany.
• Manickam, B.,Muppala S.P.R, Dinkelacker, F., 2010, Validation of some algebraic reaction models for hydrogen enriched low-swirl premixed flames, 12th  Turbulent premixed workshop 2010, Beijing, China.
• Manickam, B.,Muppala S.P.R, Dinkelacker, F., 2010, Predictability of turbulent combustion models multi-component fuel mixtures for a low-swirl premixed flame configuration, 8th Asia pacific conference on combustion, Hydrabad, India.

Further information:

• http://www.itv.uni-hannover.de

Bhuvaneswaran Manickam

The Algebraic flame surface wrinkling (AFSW) [Muppala, Dinkelacker, 2005] model developed in Reynolds Averaged Navier Stokes (RANS) context is extended into Large eddy simulation context. In addition to reaction model validation in LES context, reacting flow simulations are carried out to analyze the influence of hydrodynamic and shear layer instability in high pressure and bluff body stabilized flames. Furthermore, the LES results are evaluated using the quality and error assessment techniques proposed by Celik et al. and Klein.

Journal Publications:

• Manickam, B., Franke J., Dinkelacker, F., Muppala, S.P.R., 2010. LES of triangular stabilized lean premixed turbulent flames with an algebraic reaction closure: Quality and error assessment. Flow Turbulence and Combustion (Resumbitted). 
• Manickam, B., Muppala, S.P.R., Aluri, N.K., Dinkelacker, F., 2010. Large eddy simulation of premixed turbulent high-pressure combustion for high Reynolds number flows. (Preparation).

Oral Conference Presentations:

• Manickam, B.,Franke, J, Muppala S.P.R,Dinkelacker, F., 2009, LES of triangular stabilished lean premixed turbulent flames with an algebraic reaction closure: Quality and error assesment, 2nd QLES- 2009, Pisa, Italy.
• Manickam, B.,Franke, J, Muppala S.P.R,Dinkelacker, F., 2010, Numerical Simulation of Rod Stabilised Turbulent Premixed Flames, 5th ECCOMAS CFD - 2010, Lisbon, Portugal.

Further information:

• http://www.itv.uni-hannover.de