Holographic Measurement of Evaporating Diesel Sprays at High Pressure and Temperature : Heat Transfer, Combustion, Power,Thermophysical Properties

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Application of the pulsed laser holography technique was made to observe a diesel spray injected into a high pressure bomb. Two different holography techniques, that is, single-pulsed laser holography and double-pulsed holographic interferometry were adopted in this study. Shadowgraphs, schlieren photographs and micrographs of a reconstructed image of the spray were taken. The spray width and equivalence ratio of fuel droplets were microscopically measured. The fuel droplets and vapor around the spray in a high pressure and temperature atmosphere could be observed by single -pulsed laser holography. Interference fringes were observed along the spray edge by double-pulsed holographic interferometry. double-pulsed holographic interferometry made the image of the evaporating spray at high temperature clearer than the single-pulsed laser holography. The spray width had a tendency to decrease as the atmospheric temperature was increased. Some droplets were observed around the spray up to a pressure of 3.1 MPa and a temperature of 773 K.
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