Modeling of a projector lamp operated by a u-drive pulse power source

This article is devoted for developing a mathematical model to simulate ultra-high-pressure lamp, which is operated by an alternating current from a U-drive source. The lamp is filled with mercury gas of 10 MPa operating pressure. The model solves the complete set of magnetohydrodynamics within the fluid domain, radiation-considered and radiation-less energy balance equation in the semi-transparent (glass) and opaque (electrodes) domains, respectively. Essential features of the model are discussed in previous report. A square-wave pulse current (of an amplitude of 1.4 A) is taken to have the regular frequency of 400 Hz and the superimposed slower pulse is of 90 Hz. Evaluated time-dependent electrode temperatures for the regular and superimposed frequencies have been found to be consistent with those reported experimentally. The model, thus, demonstrates suitability in predicting performance of a prospective new lamp, subsiding expensive developments of many prototypes and difficult tests.