Abstract
AbstractThe coupling between pressure fluctuations and unsteady heat release in a combustion systems results in acoustic oscillations inside the combustion system. These acoustic oscillations, when grow sufficiently, may cause serious structural damage thereby reducing the lifespan of jet engines, gas turbines, and industrial burners. The aim of the first part of study is to define acoustically stable and unstable regions. The second part is focused on studying the effect of change in pressure field near the flame on the amplitude and frequency of the oscillations of instability. This study is carried out for three-burner positions and equivalence ratio of 0.7 by varying heat supply and total flow rate. The results show two acoustically unstable regions for 0.1 and 0.2 burner positions and only one acoustically unstable region for 0.25 burner position. The effect of pointed injection and diffused injection over a premixed flame on the sound pressure level was studied. The results show for burner position ...
Highlights
To meet the stringent emission norms, the development of lean combustion system is the necessity
Stability regions Experiments in the present investigation were carried out to demarcate the boundaries of thermoacoustic instability with three burner positions inside the Rijke tube, x/L 0.25, 0.2 and 0.1, respectively, for the total mass flow rate varying from 0.33 to 1.33 × 10−3 m3/s in steps of 0.2 × 10−3 m3/s and the heat power varying from 50 to 600 W in steps of 50 W keeping the equivalence ratio of 0.7
This study concludes that the stability regions are depends on burner location and mode of instability depends on flow rate through the burner and not much with total flow rate through Rijke tube
Summary
To meet the stringent emission norms, the development of lean combustion system is the necessity. The lean combustors are more prone to combustion instabilities. These instabilities produce the large amplitude oscillations of one or more natural acoustic mode of combustor and degrading. Deshmukh worked as research scholar in Aerospace Engineering Department, Indian Institute of Technology Bombay, India and currently working as an associate professor in Fr. C. Rodrigues Institute of Technology, Vashi, Navi Mumbai, India. His area of research interests are combustion instability, acoustic, measurement techniques, and internal combustion engine
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