Concentration distributions of intermediate hydrocarbons and soot in propane–air triple flames

Sahu, Kunja Bihari; Datta, Amitava; Sen, Swarnendu; Sarkar, A.

doi:10.1179/014426009x12519696923867

Cited by 5 publications

(1 citation statement)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The lowest values of γ and γ s are recorded in this regime as CH* emits light at 431 nm-dominantly at the blue end of the visible spectrum. Recently, Sahu et al [33] observed the similar dominance of CH* radicals in lean premixed flame in their experimental investigation on propane -air triple flames. The results of the spectrometer are consistent with the color analysis of flame recorded by the camera as observed by ∑ ∑ similar trends in γ and γ s (cf.…”

Section: Results and Discussion 31 Lbo Phenomenologymentioning

confidence: 80%

Flame Color as a Lean Blowout Predictor

Chaudhari

Sahu

Ghosh

et al. 2013

International Journal of Spray and Combustion Dynamics

View full text Add to dashboard Cite

The study characterizes the behavior of a premixed swirl stabilized dump plane combustor flame near its lean blow-out (LBO) limit in terms of CH* chemiluminiscence intensity and observable flame color variations for a wide range of equivalence ratio, flow rates and degree of premixing (characterized by premixing length, L fuel ). LPG and pure methane are used as fuel. We propose a novel LBO prediction strategy based solely on the flame color. It is observed that as the flame approaches LBO, its color changes from reddish to blue. This observation is found to be valid for different levels of fuel-air premixing achieved by changing the available mixing length of the air and the fuel upstream of the dump plane although the flame dynamics were significantly different. Based on this observation, the ratio of the intensities of red and blue components of the flame as captured by a color CCD camera was used as a metric for detecting the proximity of the flame to LBO. Tests were carried out for a wide range of air flow rates and using LPG and CH 4 as fuel. For all the operating conditions and both fuels tested, this ratio was found to monotonically decrease as LBO was approached. Moreover, the value of this ratio was within a small range close to LBO for all the cases investigated. This makes the ratio suitable as a metric for LBO detection at all levels of premixing.

show abstract

Section: Results and Discussion 31 Lbo Phenomenologymentioning

confidence: 80%