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International Journal of Automotive Technology > Volume 16(2); 2015 > Article
International Journal of Automotive Technology 2015;16(2): 339-349.
NUMERICAL INVESTIGATION OF THE EFFECTS OF CHAMBER BACKPRESSURE ON HFO SPRAY CHARACTERISTICS
M. YOUSEFIFARD, P. GHADIMI, H. NOWRUZI
Amirkabir University of Technology
ABSTRACT
In the current study, effect of chamber ambient backpressures and temperatures on non-reacting fuel spray characteristics of heavy fuel oil (HFO) under high pressure injection is numerically studied. Four different chamber backpressures ranging from 0.05 up to 2.8 MPa at two different ambient temperatures have been considered in a medium speed engine. An Eulerian-Lagrangian multiphase scheme is implemented to model HFO interaction with air continuous phase by using Open source CFD toolbox of OpenFOAM. Numerical results of fuel spray are validated with good accordance against existing experimental data. Based on the computational findings, enhancement of chamber backpressure results in reduction of temporal spray penetration and increase of spray cone angle at both ambient temperatures. Furthermore, the SMD is found to decrease due to enhancement of chamber backpressures up to 1.4 MPa. Finally, it was found that higher ambient temperature increases the spray penetration length at all chamber backpressures.
Key Words: HFO spray, OpenFOAM, Chamber backpressure, High injection pressure, Chamber temperature
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