Abstract
In connection with the hazard evaluation of hydrogen stations for fuel-cell vehicles, an image velocimetry using brightness subtraction method was applied to accurate time-dependent measurement of hydrogen-air flames in open space. An image filtering technique of enhancing the flame front edge was introduced with a spatial difference scheme for obtaining local flame velocities. The processed flame fronts were not clearly identified. The reason is attributed to the performance of the CMOS device and the A/D converter of the high-speed video camera employed.
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