Experimental and Simulated Straightening of Metal Halide Arcs Using Power Modulation

Olsen, Jo; Dreeben, Thomas D.

doi:10.1109/tia.2010.2090935

Cited by 8 publications

(7 citation statements)

References 11 publications

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“…[1][2][3][4][5][6][7][8][9][10]14,46 The presence of the azimuthal mode and the absence of the longitudinal mode is confirmed in a running HID lamp by using a spatially resolved optical method. [1][2][3][4][5][6][7][8][9][10]14,46 The presence of the azimuthal mode and the absence of the longitudinal mode is confirmed in a running HID lamp by using a spatially resolved optical method.…”

Section: A Azimuthal Waves In a Horizontally Running Lampmentioning

confidence: 99%

“…(14) is to drive apart the two almost-linearly oscillating terms by a minute amount. For a system in which the predominant momentum balance is governed by Eq.…”

Section: Why Streaming In Hid Lamps Is Not Classicalmentioning

confidence: 99%

“…Consider a onedimensional domain in the free stream of Figure 6(a). (14). The streamwise momentum balance is given by Eq.…”

Section: A a Simple Example Of Dynamically Driven Steady Streamingmentioning

confidence: 99%

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Two-dimensional streaming flows in high-intensity discharge lamps

Dreeben

Chini

2011

Physics of Fluids

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High-intensity discharge (HID) lamps embody a practical application in which acoustically generated streaming flows are used to significantly improve energy efficiency. Streaming in these lamps is examined using finite-element simulations in conjunction with available experimental results on the basis of the assumption that the streaming motion is excited by two-dimensional acoustic standing waves. Neither the magnitude nor the direction of the time-averaged flows is adequately explained by existing theory. Consequently, a modified streaming analysis is proposed in which the fluctuating flow is driven by an oscillating pressure field rather by a moving boundary and convective terms in both the instantaneous and streaming flows are included. Density variations are also shown to be important to the generation of the observed and simulated streaming. This analysis highlights the differences between streaming flows in HID lamps and those described in canonical problems appearing elsewhere in the literature.

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Section: A Azimuthal Waves In a Horizontally Running Lampmentioning

confidence: 99%

“…(14) is to drive apart the two almost-linearly oscillating terms by a minute amount. For a system in which the predominant momentum balance is governed by Eq.…”

Section: Why Streaming In Hid Lamps Is Not Classicalmentioning

confidence: 99%

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Two-dimensional streaming flows in high-intensity discharge lamps

Dreeben

Chini

2011

Physics of Fluids

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“…The AS field at other acoustic eigenmodes can be used to stabilize the plasma arc (arc straightening) [22]. The finite element model, which is presented here, should be useful in finding these modes.…”

Section: Discussionmentioning

confidence: 99%

Numerical investigation of symmetry breaking and critical behavior of the acoustic streaming field in high-intensity discharge lamps

Baumann

Schwieger

Wolff

et al. 2015

J. Phys. D: Appl. Phys.

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For energy efficiency and material cost reduction it is preferred to drive highintensity discharge lamps at frequencies of approximately 300 kHz. However, operating lamps at these high frequencies bears the risk of stimulating acoustic resonances inside the arc tube, which can result in low frequency light flicker and even lamp destruction. The acoustic streaming effect has been identified as the link between high frequency resonances and low frequency flicker. A highly coupled 3D multiphysics model has been set up to calculate the acoustic streaming velocity field inside the arc tube of high-intensity discharge lamps. It has been found that the velocity field suffers a phase transition to an asymmetrical state at a critical acoustic streaming force. In certain respects the system behaves similar to a ferromagnet near the Curie point. It is discussed how the model allows to investigate the light flicker phenomenon. Concerning computer resources the procedure is considerably less demanding than a direct approach with a transient model.

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“…This flow permitted the lighting of wide public spaces. The difference is that the volume in high intensity discharge lamps presents an improvement in regard to that of low pressure lamps, in addition to the lamp life and a better control of its functioning, thus reducing electricity consumption [1][2].…”

Section: Introductionmentioning

confidence: 99%

Experimental Characterization of Arc Motion and Light Flicker Frequencies in HID lamps. Application to CDM-T Elite 50W/930 and 35W/930

Lakhdar¹,

Messaoud²,

BENACHIBA³

et al. 2019

IJEEI

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In order to reduce the electric consumption for high intensity discharge lamps, the use of high frequencies electronic ballasts represents both a solution and many advantages such as the decrease in the congestion and low costs. However, high frequency operation is not regarded as perfectly reliable due to the appearance of acoustic resonances inside the arc tube, which can result in low frequency light flicker and even lamp destruction. Therefore a predictive model was established in order to give us at which frequencies light flicker can be expected. Moreover, we conducted an experimental study, which allows the electrical detection of frequency regions, in which the discharge arc behaves instable. Furthermore, an optical system is incorporated to record images of the discharge arc during stable and instable operating conditions. The results enable a considerably better understanding of the flicker phenomenon in HID lamps and facilitate the development of energy efficient drivers.

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Experimental and Simulated Straightening of Metal Halide Arcs Using Power Modulation

Cited by 8 publications

References 11 publications

Two-dimensional streaming flows in high-intensity discharge lamps

Two-dimensional streaming flows in high-intensity discharge lamps

Numerical investigation of symmetry breaking and critical behavior of the acoustic streaming field in high-intensity discharge lamps

Experimental Characterization of Arc Motion and Light Flicker Frequencies in HID lamps. Application to CDM-T Elite 50W/930 and 35W/930

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