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Research Papers: Fuel Combustion

In-Cylinder Spray and Combustion Investigations in a Heavy-Duty Optical Engine Fueled With Waste Cooking Oil, Jatropha, and Karanja Biodiesels

[+] Author and Article Information
Chetankumar Patel, Krishn Chandra, Rashmi A. Agarwal

Engine Research Laboratory,
Department of Mechanical Engineering,
Indian Institute of Technology Kanpur,
Kanpur 208016, India

Joonsik Hwang, Choongsik Bae

Engine Laboratory,
Department of Mechanical and
Aerospace engineering,
Korea Advanced Institute of Science and
Technology (KAIST),
Daejeon 34141, South Korea

Tarun Gupta

Department of Civil Engineering,
Indian Institute of Technology Kanpur,
Kanpur 208016, India

Avinash Kumar Agarwal

Engine Research Laboratory,
Department of Mechanical Engineering,
Indian Institute of Technology Kanpur,
Kanpur 208016, India
e-mail: akag@iitk.ac.in

1Corresponding author.

Contributed by the Internal Combustion Engine Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received May 2, 2018; final manuscript received June 9, 2018; published online July 23, 2018. Editor: Hameed Metghalchi.

J. Energy Resour. Technol 141(1), 012201 (Jul 23, 2018) (12 pages) Paper No: JERT-17-1416; doi: 10.1115/1.4040579 History: Received May 02, 2018; Revised June 09, 2018

In this experimental study, spray and combustion characteristics of a single cylinder optical engine were evaluated by varying the fuel injection pressure (FIP) (40, 80, and 120 MPa). Karanja, Jatropha, and waste cooking oil (WCO) biodiesels were the test fuels and their results were compared with baseline mineral diesel. There was no significant difference observed in the spray tip penetration amongst all test fuels, however the spray cone angles of biodiesels were slightly higher than baseline mineral diesel. Mineral diesel showed relatively shorter injection delay compared to biodiesels at 40 and 80 MPa FIP. Jatropha and Karanja biodiesels showed higher flame luminosity at all FIPs, while WCO biodiesel showed lower flame luminosity, especially at higher FIPs of 80 and 120 MPa, primarily due to lower viscosity of WCO biodiesel. Flame spatial fluctuation (FSF) and flame nonhomogeneity (FNH) were also found to be higher for biodiesels at lower FIP of 40 MPa. Karanja and Jatropha biodiesels showed higher FSF and FNH at higher FIPs compared to WCO biodiesel.

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Figures

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Fig. 1

(a) Schematic of the optical test engine experimental setup, (b) test fuel injector configuration, and (c) optical path arrangement for in-cylinder spray and combustion image capture

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Fig. 2

Distillation curves of all test fuels

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Fig. 3

In-cylinder spray evolution under evaporative condition at an injection timing of (a) −5 deg CA aTDC at 40 MPa FIP, (b) −5 deg CA aTDC at 80 MPa FIP, and (c) −5 deg CA aTDC at 120 MPa FIP

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Fig. 4

(a) variations in spray penetration lengths for test fuels at different FIPs and (b) variations in spray cone angle for test fuels at different FIPs

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Fig. 5

(a) In-cylinder combustion images at an injection timing of −5 deg CA aTDC at 40 MPa FIP and (b) normalized flame luminosity and flame luminosity variation rate at an injection timing of −5 deg CA aTDC at 40 MPa FIP

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Fig. 6

(a) In-cylinder combustion images at an injection timing of −5 deg CA aTDC at 80 MPa FIP and (b) normalized flame luminosity and flame luminosity variation rate at an injection timing of −5 deg CA aTDC at 80 MPa FIP

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Fig. 7

(a) In-cylinder combustion images at an injection timing of −5 deg CA aTDC at 120 MPa FIP and (b) normalized flame luminosity and flame luminosity variation rate at an injection timing of −5 deg CA aTDC at 120 MPa FIP

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Fig. 8

(a) FSF and (b) FNH for test fuels at different FIPs

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