Global hydrodynamic instability and blowoff dynamics of a bluff-body stabilized lean-premixed flame

2021 ◽  
Vol 33 (3) ◽  
pp. 034103
Author(s):  
Manikandan Balasubramaniyan ◽  
Abhijit Kushwaha ◽  
Yu Guan ◽  
Jianchang Feng ◽  
Peijin Liu ◽  
...  
Keyword(s):  
Bluff Body ◽  
Hydrodynamic Instability ◽  
Premixed Flame ◽  
Lean Premixed

Effect of hydrogen enrichment on swirl/bluff-body lean premixed flame stabilization

2020 ◽  
Vol 45 (18) ◽  
pp. 10906-10919 ◽  
Author(s):  
Shilong Guo ◽  
Jinhua Wang ◽  
Weijie Zhang ◽  
Meng Zhang ◽  
Zuohua Huang
Keyword(s):  
Bluff Body ◽  
Flame Stabilization ◽  
Premixed Flame ◽  
Lean Premixed ◽  
Hydrogen Enrichment

scholarly journals Modelling of a Bluff-Body Stabilised Premixed Flames Close to Blow-Off

Computation ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 43
Author(s):  
Shokri Amzin ◽  
Mohd Fairus Mohd Yasin
Keyword(s):  
Bluff Body ◽  
Fluid Dynamic ◽  
Premixed Flames ◽  
Pollutant Emissions ◽  
Moment Closure ◽  
Recirculation Region ◽  
Scalar Dissipation ◽  
Average Error ◽  
Conditional Moment ◽  
Lean Premixed

As emission legislation becomes more stringent, the modelling of turbulent lean premixed combustion is becoming an essential tool for designing efficient and environmentally friendly combustion systems. However, to predict emissions, reliable predictive models are required. Among the promising methods capable of predicting pollutant emissions with a long chemical time scale, such as nitrogen oxides (NOx), is conditional moment closure (CMC). However, the practical application of this method to turbulent premixed flames depends on the precision of the conditional scalar dissipation rate,. In this study, an alternative closure for this term is implemented in the RANS-CMC method. The method is validated against the velocity, temperature, and gas composition measurements of lean premixed flames close to blow-off, within the limit of computational fluid dynamic (CFD) capability. Acceptable agreement is achieved between the predicted and measured values near the burner, with an average error of 15%. The model reproduces the flame characteristics; some discrepancies are found within the recirculation region due to significant turbulence intensity.

Effects of preferential transport in turbulent bluff-body-stabilized lean premixed CH4/air flames

2012 ◽  
Vol 159 (8) ◽  
pp. 2563-2575 ◽  
Author(s):  
Robert S. Barlow ◽  
Matthew J. Dunn ◽  
Mark S. Sweeney ◽  
Simone Hochgreb
Keyword(s):  
Bluff Body ◽  
Lean Premixed ◽  
Preferential Transport

Characteristics of Lean Premixed Flame in Various Oxygen Concentrations Measured by Laser Imaging Techniques

2013 ◽  
Vol 35 (6-8) ◽  
pp. 576-582
Author(s):  
Masaharu Komiyama ◽  
Kenichiro Takeishi ◽  
Yohei Fujita ◽  
Kiyonobu Nakayama
Keyword(s):  
Imaging Techniques ◽  
Premixed Flame ◽  
Laser Imaging ◽  
Lean Premixed ◽  
Oxygen Concentrations

Numerical Simulation of Turbulent Combustion Flows for Coaxial Jet Cluster Burner

2013 ◽  
Author(s):  
Keita Yunoki ◽  
Tomoya Murota ◽  
Keisuke Miura ◽  
Teruyuki Okazaki
Keyword(s):  
Turbulent Combustion ◽  
High Efficiency ◽  
Premixed Combustion ◽  
Premixed Flame ◽  
Gas Temperature ◽  
Lean Premixed Combustion ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Lean Premixed ◽  
Multiple Holes

We have developed a burner for the gas turbine combustor, which was high efficiency and low environmental load. This burner is named the “coaxial jet cluster burner” and, as the name indicates, it has multiple fuel nozzles and holes in a coaxial arrangement. To form lean premixed combustion, this burner mixes fuel and air in the multiple holes rapidly. The burner can change the combustion form between premixed and non-premixed combustion by controlling the mixing. However, the combustion field coexisting with premixed and non-premixed combustion is complicated. The phenomena that occur in the combustion field should be understood in detail. Therefore, we have developed the hybrid turbulent combustion (HTC) model to calculate the form in which non-premixed flame coexists with premixed flame. Turbulent flow has been simulated using a large eddy simulation (LES) with a dynamic sub grid scale (SGS) model coupled with the HTC model. These models were programmed to a simulation tool based on the OpenFOAM library. However, there were unclear points about their applicability to an actual machine evaluation and the predictive precision of CO concentration which affects burner performance. In this study, we validate the HTC model by comparing its results with measured gas temperature and gas concentration distributions obtained with a coaxial jet cluster burner test rig under atmospheric pressure. In addition, we analyze the CO generation mechanism for the lean premixed combustion in the burner.

scholarly journals Experimental Study on Bluff-Body Stabilized Premixed Flame with a Central Air/Fuel Jet

Energies ◽  
2017 ◽  
Vol 10 (12) ◽  
pp. 2011 ◽  
Author(s):  
Yiheng Tong ◽  
Shuang Chen ◽  
Mao Li ◽  
Zhongshan Li ◽  
Jens Klingmann
Keyword(s):  
Experimental Study ◽  
Bluff Body ◽  
Premixed Flame ◽  
Fuel Jet

Combustion and NOx emission characteristics of dual-stage lean premixed flame

2019 ◽  
Vol 160 ◽  
pp. 113951
Author(s):  
Wenhua Zhao ◽  
Penghua Qiu ◽  
Li Liu ◽  
Wenkai Shen ◽  
Yajin Lyu
Keyword(s):  
Premixed Flame ◽  
Nox Emission ◽  
Emission Characteristics ◽  
Lean Premixed ◽  
Dual Stage
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