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research-article

Method of Identifying Injector Coking from the Spray Field of Mechanical and CRDi Injectors using Intensity of Scattered Light

[+] Author and Article Information
Ronith Stanly

Research Intern, Functional Fluids Laboratory, 3M India Limited, No.48-51, Electronics City, Bangalore-560100. India
ronithstanly@yahoo.com

Gopakumar Parameswaran

General Manager-Technical, Functional Fluids Laboratory, 3M India Limited, No.48-51, Electronics City, Bangalore-560100. India
gopa@mmm.com

Bibin Sagaram

Research Intern, Functional Fluids Laboratory, 3M India Limited, No.48-51, Electronics City, Bangalore-560100. India
bibin.sagaram@gmail.com

1Corresponding author.

ASME doi:10.1115/1.4037869 History: Received March 22, 2017; Revised July 07, 2017

Abstract

The influence of injector coking deposits on the spray field of single-hole Mechanical Port Fuel Injectors (PFI) and multi-hole Common Rail Direct injection (CRDi) injectors were studied using Image Processing and Analysis. Instead of employing the traditional accelerated coking process, a clog removal methodology was employed using a commercial fuel system cleaning solution. Variations in the fuel atomization of coked and cleaned injectors were studied based on the spatial distribution of fine, medium and coarse droplets in the near-field region; this was detected as a function of the intensity of scattered light. The improvements in the atomization perceived by this method were identified with the improvements in spray cone angle and speed of spray jets in the case of Mechanical injectors, and by the symmetric nature of the jets and the decrease in the weights of injector nozzles and needles in the case of multi-hole CRDi injectors. It was observed that the removal of coking deposits resulted in the reduction of coarse droplets in all the three sub-divided regions of the near-field region and the increase in the presence of medium and fine droplets in the mid and far regions of the near-field.

Copyright (c) 2017 by ASME
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