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Determination of the optical depth of a DI diesel spray Francisco Payri, Jose Vicente Pastor, Raul Payri*, Julien Manin
The Journal of Mechanical Science and Technology, vol. 25, no. 1, pp.209-219, 2011
Abstract : The optical depth is responsible of limiting the optical diagnostic using visible wavelength in the sprays. This paper proposes to measure
the optical depth directly in a real Diesel spray through line-of-sight laser extinction measurements. This easily reproducible method
which does not require expensive or complex optical techniques is detailed and the measurement procedure is presented in this paper. As
diesel sprays are mostly optically thick, the measurements in the denser region are not reliable and a fuel concentration model has been
used to derive the results to the entire spray. This work provides values of SMD at different distance from the nozzle tip depending on the
specific parameters like injection pressure or discharge density. The values extracted from a combined experimental/computational approach
have been compared to PDPA measurements under the same testing conditions. The results have shown that the maximum optical
depth was higher than 10 and that an increase of the injection pressure led to higher ¥ó values. The SMD values appeared to be below the
results measured by the PDPA and the droplet diameter showed to be the main responsible of the optical depth of the jet under the tested
conditions.
Keyword :
Diesel; Light extinction; Optical depth; SMD; Sprays
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