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Numerical investigation of the effects of chamber backpressure on HFO spray characteristics

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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.

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Abbreviations

HFO:

heavy fuel oil

PM:

particulate matter

RAS:

reynolds averaged simulation

RANS:

reynolds averaged navier stokes

RMSE:

root mean square error

ASOI:

after start of injection

SMD:

sauter mean diameter

PISO:

pressure implicit with splitting of operator

SIMPLE:

semi implicit method for pressure linked equations

LPT:

lagrangian particle tracking

S i,mo :

interaction with the spray liquid phase as a source term

S he :

heat transferred from the liquid phase as a source term

Pr:

prandtl number

X f :

mass fraction of fuel

\(\dot f\) CO :

contribution due to the effects of collision of the droplets

\(\dot f\) br :

contribution due to the effects of droplets breakup

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Authors and Affiliations

  1. Department of Marine Technology, Amirkabir University of Technology, 424 Hafez Avenue, Tehran, Iran

    M. Yousefifard, P. Ghadimi & H. Nowruzi

Authors
  1. M. Yousefifard
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  2. P. Ghadimi
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  3. H. Nowruzi
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Correspondence to P. Ghadimi.

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Yousefifard, M., Ghadimi, P. & Nowruzi, H. Numerical investigation of the effects of chamber backpressure on HFO spray characteristics. Int.J Automot. Technol. 16, 339–349 (2015). https://doi.org/10.1007/s12239-015-0036-z

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  • DOI: https://doi.org/10.1007/s12239-015-0036-z

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