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Experimental Study of Dual-Fuel Diesel/Natural Gas High-Pressure Injection
1Department of Automotive Engineering, Beijing University of Technology, Beijing100124, China.
ACS Omega
|January 16, 2023
Summary
Dual-fuel diesel/natural gas injection shows distinct two-stage spray behavior, with initial smaller diesel spray followed by larger penetration. Increased diesel pressure advances methane interaction and enhances spray asymmetry.
Area of Science:
- Combustion Science
- Automotive Engineering
- Chemical Engineering
Background:
- Dual-fuel diesel/natural gas engines offer reduced emissions and high efficiency.
- Optimizing air-fuel mixing through high-pressure diesel and natural gas injection is crucial.
- Understanding spray dynamics is key to improving dual-fuel engine performance.
Purpose of the Study:
- To optically investigate the high-pressure dual-fuel diesel/methane injection process.
- To analyze the spray characteristics and penetration dynamics in a constant-volume vessel.
- To determine the influence of diesel injection pressure on dual-fuel spray behavior.
Main Methods:
- Utilized a constant-volume vessel test rig for optical experimental investigation.
- Analyzed diesel spray penetration (S_diesel), area (A_diesel), and perimeter (C_diesel).
- Varied diesel injection pressure to observe its effect on spray characteristics.
Main Results:
- Dual-fuel injection exhibits a two-stage diesel spray penetration process.
- Stage I: Diesel spray dimensions are smaller than single diesel injection.
- Stage II: Diesel spray dimensions become larger; increased diesel pressure advances methane interaction and enhances asymmetry, shifting the spray cone.
Conclusions:
- The dual-fuel injection process is characterized by two distinct stages impacting spray dynamics.
- Diesel injection pressure linearly influences the two-stage injection characteristics and interaction timing.
- Methane jet significantly enhances the asymmetry of the dual-fuel spray, shifting the cone towards the methane jet.
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