Experimental and Theoretical Analysis of Spray Characteristics of Biodiesel Blends with Diethyl Carbonate in a Common-Rail Injection System
Publication: Journal of Energy Engineering
Volume 149, Issue 1
Abstract
This study examines the spray characteristics of biodiesel, diethyl carbonate (DEC), and their mixtures in a common-rail injection system. Using the schlieren method, the spray tip penetration, spray cone angle, spray tip velocity, spray area, and spray liquid core ratio were observed with a high-speed camera. The test results show that the spray pressure and ambient pressure have significant effects on the spray characteristics. Increasing the spray pressure and decreasing the ambient pressure can increase the spray tip penetration, decrease the spray cone angle, and increase the spray area. After the addition of DEC to biodiesel, with increasing the mixing ratio, the viscosity and surface tension of the mixed fuel are reduced, but the density is increased. This increases the spray cone angle and spray area of the mixed fuel, and it reduces the Sauter mean diameter (SMD). The SMD of droplets were calculated, and it was found that DEC30 has the smallest SMD, and it is of the same order as that of diesel. An improved calculation model for the spray tip penetration of the DEC and biodiesel mixture under high injection pressure was obtained by modifying the exponent of an existing model. By comparing the linear relationship between the injection pressure and the spray tip penetration, it was found that the spray tip penetration of DEC10 has the largest increase.
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Data Availability Statement
All data, models and code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This work is supported by the National Key R&D Program of China (Grant No. 2021YFF0601004).
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Information & Authors
Information
Published In
Journal of Energy Engineering
Volume 149 • Issue 1 • February 2023
Copyright
© 2022 American Society of Civil Engineers.
History
Received: May 22, 2022
Accepted: Sep 13, 2022
Published online: Nov 22, 2022
Published in print: Feb 1, 2023
Discussion open until: Apr 22, 2023
ASCE Technical Topics:
- Cameras
- Carbonation
- Chemical processes
- Chemistry
- Conical bodies
- Energy engineering
- Energy sources (by type)
- Engineering fundamentals
- Environmental engineering
- Equipment and machinery
- Fluid mechanics
- Fuels
- Geometry
- Hydrologic engineering
- Materials characterization
- Materials engineering
- Mathematics
- Mixtures
- Non-renewable energy
- Petroleum
- Surface Tension (water properties)
- Viscosity
- Water and water resources
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