Session: 04-16: Atomization & Sprays

Paper Number: 83526

83526 - On the Dynamics of Asymmetric-Radially Expanding Liquid Sheet Originating From Impact of Like-on-Unlike Impinging Jets 

            Like-on-Unlike Impinging jet atomizers were widely used in rocket industry because of their inherent simplicity of configuration, fabrication, impact based momentum transfer originated atomization behavior in liquid phase. This work aims at systematically investigating liquid sheet properties (viz., sheet breakup length, sheet width, sheet area, semi-cone angle) under varied operating conditions specified in terms of Weber number with constant and varying momentum ratios of jets using backlight shadowgraph. Role of perforations originating from different azimuthal angle and their associated growth rate in terms of area, perimeter, geometrical parameters, radial velocity were systematically investigated and reported. In addition, to understand the dominant sheet oscillation modes, Proper Orthogonal Decomposition (POD-dimensionality reduction technique) was carried out under varying operating conditions and dominant coherent structures together with Fast Fourier Transform (FFT) were reported. Role of Kelvin-Helmholtz instability waves originating from impact point, Rayleigh-Taylor instability due to relative acceleration of sheet, origin of Rayleigh-Plateau instability of ligaments and subsequent formation of droplets were captured using POD, FFT and reported. An attempt is made to model the sheet parameters (breakup length, sheet area, sheet width), Perforation Growth rates, KH-frequency and wave length, droplet diameter under experimental conditions were made. Different regimes based on sheet morphology is identified and reported based on operating conditions

 

Presenting Author: Karthikeyanathan S ISRO

Presenting Author Biography: Working as Engineer

Authors:

Karthikeyanathan S ISRO
Satyanarayanan R Chakravarthy Indian Institute of Technology, Madras
Tg Madhavan ISRO
Shanmugadas Kp IIT Jammu
Ganesh P ISRO