强迫扰动下的射流撞击雾化特性

doi:10.7527/S1000-6893.2020.24027

Abstract

Abstract: To comprehensively grasp the working characteristics of impinging jet injectors and further understand the role atomization plays in combustion instability, the unsteady atomization characteristics of impinging jet injectors coupled with forced perturbation are investigated experimentally and computationally. For the experiment, pressure perturbations in the feed pipe are generated by a hydro-mechanical pulsator, pressure fluctuations are recorded by pulsating pressure transducers, and backlit images of dynamic atomization field are captured by high-speed camera. For the simulation, based on open-source software Gerris, atomization processes coupled with forced perturbations are simulated by setting a periodically varying velocity inlet. The ability of the established numerical schemes to simulate the unsteady atomization process is first validated. Secondly, the natural atomization process is compared with forced atomization, and the atomization characteristics of impinging liquid jets coupled with forced perturbations are analyzed. Finally, the effects of perturbation frequency and amplitude on impinging jet atomization are investigated. Results revealed that for impinging jet atomization coupled with forced perturbations, arc-shaped groups of droplets accumulate in the atomization field which exhibits periodical characteristics. The frequency of atomization is consistent with that of forced perturbations. Within the frequency range (1 257-3 563 Hz) in this study, the atomization process always responds to pressure perturbations. The perturbation frequency mainly affects the distance between adjacent arc-shaped droplet groups and the phase relation between atomization field and oscillating pressure field, while the perturbation amplitude mainly affects the strength of Klystron effect. With the amplitude increasing, the breakup length of the liquid sheet decreases, and the mass flow rate downstream of the impingement point changes from linear pattern to non-linear one, that is, from sinusoidal waves to steep-fronted waves.

Key words: impinging jet injector, forced perturbation, atomization, Klystron effect, Gerris, periodicity, combustion instability

CLC Number:

V434.3

LI Jia'nan, LEI Fanpei, YANG Anlong, ZHOU Lixin. Atomization characteristics of impinging liquid jets coupled with forced perturbation[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2020, 41(12): 124027-124027.

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Atomization characteristics of impinging liquid jets coupled with forced perturbation

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