Abstract
Effect of Acoustic Excitation of Gas Flow in a Gas-Centered Swirl Coaxial Injector
Highlights
Proper atomization is crucial for the efficient working of an engine and its investigation is essential for improving the performance
A very common injection and atomization technique among the coaxial injectors is the swirl coaxial injectors, where, when the gaseous propellant is at the center and the swirling liquid propellant exits from the annular space it is known as a gascentered swirl coaxial (GCSC) injector
The images shown here are for momentum flux ratio (MFR) = 2.2, which is before the start of self-pulsation regime
Summary
Proper atomization is crucial for the efficient working of an engine and its investigation is essential for improving the performance. Sivakumar and Kulkarni[8] identified four regimes of breakup in a non-recessed GCSC injector They are wave-assisted, perforated, segmented and pulsation regimes with increasing gas momentum. Lightfoot et al [17] observed these behaviors for a fully developed spray from a GCSC injector This is evident from the studies of Sivakumar and Kulkarni [8], where they have identified a pulsation regime of breakup as well, among other regimes. It is worth emphasizing here that the fluctuating chamber acoustics often leads to perturbations in the gas flow which influence the atomization characteristics and may affect the combustion stability This mode of fluctuation of flow in injectors is different from the self-pulsation as it is initiated by external forcing. The objective of the present work is to introduce periodic perturbations to the gas flow and do a preliminary assessment of the possible coupling between the acoustic forcing and the atomization process in a GCSC injector
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