Scientia Iranica

Scientia Iranica

Experimental and theoretical investigation on spray characteristics of bio-ethanol blends using a direct injection system

Authors
Amirreza Ghahremani
Mojtaba Jafari
Mohammad Ahari
Mohammad Hassan Saidi 1
Ahmad Hajinezhad 2
Ali Asghar Mozaffari 1
1 Professor
2 Assistant Professor
10.24200/sci.2017.4029
Abstract
In the present work the spray characteristics of bio-ethanol and its blends have been experimentally and theoretically investigated. To have a comprehensive study, the effects of ambient condition and injection pressure on the spray of different blends have been considered. Macroscopic and microscopic characteristics of spray such as tip penetration length, cone angle, projected area, volume, Sauter Mean Diameter (SMD), and Ohnesorge number are investigated precisely. Besides, air entrainment and atomization analysis have been carried out to improve mixture formation process. Using curve fitting and least squares method, theoretical correlations have been suggested in such a way to predict experimental results with the accuracy of 9.9%. To have a good estimation for the calculated parameters, uncertainty analysis has been performed. The results demonstrate enhancing the injection pressure or decreasing the ambient pressure, improve the atomization characteristics of spray. Moreover outcomes of this study indicate, spray tip penetration is enhanced by increasing the injection pressure or bio-ethanol percentage in the blend, while spray cone angle showing opposite behavior.
Keywords
Bio-Fuel
Mixture Formation
Spray
Visualization, Schlieren
Scientia Iranica
Volume 24, Issue 1 - Serial Number 1
Transactions on Mechanical Engineering (B)
February 2017
Pages 237-248

  • Receive Date 26 July 2015
  • Accept Date 27 July 2017