Backcoupling of acoustic streaming on the temperature field inside high-intensity discharge lamps

33rd UIT (Italian Union of Thermo-fluid dynamics) Heat Transfer Conference

物理学;力学

Schwieger, J.^1 ; Baumann, B.^1 ; Wolff, M.^1 ; Manders, F.^2 ; Suijker, J.^2,3

Hamburg University of Applied Sciences, Department of Mechanical Engineering and Production, Berliner Tor 21, Hamburg

20099, Germany^1

Philips Lighting, Steenweg op Gierle 417, Turnhout

2300, Belgium^2

Technical University Eindhoven, Den Dolech 2, Eindhoven

5612AZ, Netherlands^3

关键词: Acoustic resonance;    Acoustic streaming effect;    Frequency ranges;    High frequency HF;    High intensity discharge lamps;    Light intensity fluctuations;    Multi-physics modeling;    Operating strategy;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/655/1/012045/pdf
DOI  :  10.1088/1742-6596/655/1/012045

学科分类：力学，机械学

来源: IOP

【 摘 要 】

Operating high-intensity discharge lamps in the high frequency range (20-300 kHz) provides energy-saving and cost reduction potentials. However, commercially available lamp drivers do not make use of this operating strategy because light intensity fluctuations and even lamp destruction are possible. The reason for the fluctuating discharge arc are acoustic resonances in this frequency range that are excited in the arc tube. The acoustic resonances in turn generate a fluid flow that is caused by the acoustic streaming effect. Here, we present a 3D multiphysics model to determine the influence of acoustic streaming on the temperature field in the vicinity of an acoustic eigenfrequency. In that case a transition from stable to instable behavior occurs. The model is able to predict when light flicker can be expected. The results are in very good accordance with accompanying experiments.