Experimental and Numerical Investigation of Atomization characteristics of Diesel and Mazut Fuel injected from a Pressure-Swirl Atomizer

Document Type : Original Article

Author

Faculty of Aerospace Engineering, K. N. Toosi University of Technology

Abstract

Experimental and Numerical Investigation of Atomization characteristics of Diesel and Mazut Fuel injected from a Pressure-Swirl Atomizer
 
Elyas Rostami1, Hossein Mahdavy Moghaddam 2*
1- Aerospace Engineering Department, K. N. Toosi University of Technology, Tehran, Iran, elyas.rostami@email.kntu.ac.ir
2- Aerospace Engineering Department, K. N. Toosi University of Technology, Tehran, Iran, mahdavy@kntu.ac.ir
 *Corresponding author
(Received: 2021.05.02, Received in revised form: 2021.06.15, Accepted: 2021.06.23)
 
In this research, an attempt has been made to use experimental and numerical methods to measure the powdering parameters of a heavy non-Newtonian oil fuel called Mazut and a light petroleum fuel called diesel, as well as to investigate the spray behavior of these fuels. Very powerful imaging equipment was used to record the spray images of the fuels and the data were extracted by analyzing the images. Finally, the method of maximum entropy was used for numerical analysis of the distribution function of fuels spray. From a pressure difference of 15 bar onwards, the mass flow rate of the fuel remains almost constant (between 1.6 and 1.8 g/s). The angle of the Mazut fuel spray cone initially increases, and after the flow approaches full atomization (at temperatures above 90 ° and pressures above 15 bar), it reaches approximately a constant value of 80° (the diesel spray cone angle also reaches an almost constant value of 85°). The breakup length and droplets diameter also decrease with increasing fuel temperature and pressure, and with the full development of the flow, they tend to almost zero. The diameter size distribution of droplets becomes smoother and more uniform by increasing the viscosity of the fluid. Also, the velocity distribution of droplets becomes smoother and more uniform by decreasing the viscosity of the fluid.

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References

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History

  • Receive Date: 02 May 2021
  • Revise Date: 15 June 2021
  • Accept Date: 23 June 2021

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