Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 30982
An Investigation on the Effects of Injection Spray Cone on Propulsive Droplets in a Duct

Authors: M. Mojtahedpoor


This paper addresses one important aspect of combustion system analysis, the spray evaporation and dispersion modeling. In this study we assume an empty cylinder which is as a simulator for a ramjet engine and the cylinder has been studied by cold flow. Four nozzles have the duties of injection which are located in the entrance of cylinder. The air flow comes into the cylinder from one side and injection operation will be done. By changing injection velocity and entrance air flow velocity, we have studied droplet sizing and efficient mass fraction of fuel vapor near and at the exit area. We named the mass of fuel vapor inside the flammability limit as the efficient mass fraction. Further, we decreased the initial temperature of fuel droplets and we have repeated the investigating again. To fulfill the calculation we used a modified version of KIVA-3V.

Keywords: ramjet, droplet sizing, injection velocity, air flowvelocity, efficient mass fraction

Digital Object Identifier (DOI):

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1115


[1] KIVA-II: A Computer Program for Chemically Reactive Flows with Sprays, Los Alamos, National laboratory.
[2] S. R. Turns, An introduction to Combustion Concepts and Applications, Second edition, Chapter 10 ,369-410 (2000).
[3] G. L. Hubbard, V. E. Denny and A. F. Mills, Droplet Evaporation: Effects of Transiments and Variable Properties, University of California, Los Angeles, CA 90024, U.S.A.
[4] F. R. Newbold and N. R. Amundson. A model for evaporation of a multi-component droplet, A.Z.Ch.E. JI, 19, 22-30 (1973).
[5] K. Prommersberger, G. Maier, S. Wittig, Validation and Application of a Droplet Evaporation Model for Real Aviation Fuel.
[6] B. E. Gelfand, Droplet Breakup Phenomena in Flows With Velocity Lag, Prog. Energy Combust. Sci. Vol. 22. pp. 201-265, 1996.
[7] Salah Addin B. Al-Omari, Numerical simulation of liquid fuel sprays evolution and the subsequent vapor/air mixture formation in a duct with a 90┬░-bend, International Communications in Heat and Mass Transfer 35 (2008) 1397-1402.
[8] J. C. Kent, Quasi-steady diffusion-controlled droplet evaporation and condensation, Appl. Scent. Res., Ser. AD, 315-359 (1973).
[9] A. Williams, Combustion of droplets of liquid fuels: a review, Comber. Flume 21, l-31 (1973).