Abstract

A drop sizing technique based on the diffraction of light by spherical particles was modified to yield timeresolved drop size measurements in a pulsed spray. The diffraction pattern produced by passing a collimated HeNe laser beam through the fuel spray was measured with a photodiode located in the focal plane of a collection lens. The pulsed spray was operated at a frequency of 1670 cycles/min with a spray duration of 28 ms; measured drop sizes for these conditions varied from 106 pm at the start of injection to 75 /mi near the end of injection.

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