Acoustic Reynolds Stress: The Source of Coherent Structures During Combustion Instability - Novel Combustion Concepts for Sustainable Energy Development - page 356

Acoustic Reynolds Stress: The Source
of Coherent Structures During
Combustion Instability

Chellappan Balaji, Ashwin Kannan, Ramgopal Sampath
and Satyanarayanan Chakravarthy

Abstract Combustion was from prehistoric times until the last

century. Concerns about environmental pollution from combustion emissions
dominated the end of that century. Global warming due to greenhouse gas emis-
sions has predominated pollutant emissions as a major cause of concern against
concern by the end of the

' taken for granted '

first decade of the present century. Yet, a majority of the

world s energy and transportation needs are met from combustion of coal, oil and

biomass. This trend is likely to continue well into the foreseeable future. Thus,
a

'

approach seems to be adopted globally, particularly during the
years of economic downturn

' business as usual '

Keywords Flow and acoustics Flame-acoustic coupled simulations Combustion

instability Acoustic Reynolds stress (ARS) Combustion-acoustic lock-on

1 Introduction

Combustion was from prehistoric times until the last century.

Concerns about environmental pollution from combustion emissions dominated the
end of that century. Global warming due to greenhouse gas emissions has pre-
dominated pollutant emissions as a major cause of concern against concern by the
end of the

' taken for granted '

s energy
and transportation needs are met from combustion of coal, oil and biomass. This
trend is likely to continue well into the foreseeable future. Thus, a

first decade of the present century. Yet, a majority of the world '

' business as