Atomization and Sprays Journal of the International Institutes for Liquid Atomization and Spray Systems

ISSN for PRINT: 1045-5110

For Online Access

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1999, Volume9

Issue 2

122 pages

Issue price - $75.00

M. De Joannon
Istituto di Ricerche sulla Combustione, C.N.R., Napoli, Italy

Antonio Cavaliere
Dipartimento di Ingegneria Chimica, Università Federico II, Naples, Italy

Raffaele Ragucci
Istituto di Ricerche sulla Combustione, CNR, P.le Tecchio 80, 80125 Naples, Italy

Autoignition time delay of tetradecane spray injected in nearly quiescent, high-temperature, high-pressure, diluted and not diluted air has been measured by detecting spontaneous luminous emission. The photodiode location and its spectral sensitivity were carefully tested with preliminary comparison to spectrally resolved measurements by using a spectrograph equipped with an intensified CCD camera.
The measurements were performed starting from a temperature of 873 K, a pressure of 3.6 MPa, and an oxygen molar fraction of 0.21. One of these ambient conditions was fixed and the other two parameters were lowered to 683 К ambient temperature, 1.1 MPa, and 0.06 oxygen molar fraction.
The results were analyzed in relation to the expected ones, which were based on the available models relative to processes controlled by atomization, evaporation, quenching, and chemical kinetics.
The main result of this analysis has been the characterization of the relationship between ignition delay time and oxygen molar fraction in the ambiance that has been found to be well described by a -2 power law. This behavior supports the low-temperature kinetic scheme for paraffin, which hypothesizes oxygen addition on fuel molecules. Moreover, transcritical and supercritical droplet evaporation regimes have been identified as functions of ambient temperature and pressure.

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