Cavitation Characteristics Study on the Outlet Channel of Atomization Nozzle Based on the Self-excited Oscillating Pulse Effects

doi:10.3901/JME.2016.14.204

Abstract

Abstract:

The nozzle structure and jet motion parameters play the important role in the liquid’s cavitation flow state. Based on the atomization theory caused by cavitation bubble breaking and the cavitation forming process of self-excited oscillation pulsed nozzle’s outlet channel, the jet cavitation effect on the self-excited oscillation pulsed jet atomization effect is analyzed. On the basis of self-excited oscillation pulsed atomization nozzle structure, the influence of the jet velocity and fluctuating intensity for the cavitation effect of nozzle’s outlet channel are analyzed, meanwhile, the flow Reynolds number and fluctuating pressure are raised for demonstrating the outlet channel cavitation degree, and the Reynolds number and the nozzle chamber aspect ratio are acquired which could guarantee better cavitation state of nozzle’s outlet channel based on the self-excited oscillation pulsed nozzle finite element analysis. The results show thatWhen the coming flow Reynolds number increases gradually within 2.14×10⁵-3.05×10⁵, the liquid volume fraction of the self-excited oscillation pulsed atomization nozzle’s outlet channel decreases firstly, and then increases, the corresponding cavitation degree enhance firstly and then weaken. The better cavitation effect in self-excited oscillation pulsed atomization nozzle’s outlet channel is formed when Reynolds number is in 2.44×10⁵-2.75×10⁵, the best cavitation state in the outlet channel will appears when the Reynolds number is about 2.44×10⁵. Fluctuating characteristic value is proportional to the nozzle outlet channel fluctuating pressure amplitude difference, when the self-excited oscillation pulsed atomization nozzle chamber aspect ratio increases, the fluctuating pressure amplitude difference increase firstly, and then decrease. When the nozzle chamber aspect ratio is 0.60-0.70, the nozzle’s outlet channel cavitation state is better. The results provide theoretical basis for the design of self-excited oscillation pulsed atomization nozzle.

Key words: atomization nozzle, cavitation characteristics, fluctuating pressure, outlet channel, Reynolds number, self-excited oscillating pulse effect

WANG Zhaohui, HU Yanan, LIAO Zhenfang, GAO Quanjie, CHEN Si. Cavitation Characteristics Study on the Outlet Channel of Atomization Nozzle Based on the Self-excited Oscillating Pulse Effects[J]. Journal of Mechanical Engineering, 2016, 52(14): 204-213.

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Cavitation Characteristics Study on the Outlet Channel of Atomization Nozzle Based on the Self-excited Oscillating Pulse Effects

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