Numerical investigation of natural gas-diesel dual-fuel engine with different piston geometries and radial clearances
| Autor: | Hua Zhao, Xinyan Wang, Jianguo Yang, Shen Zhaojie, Yitao Shen, Lin Bo |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
020209 energy 02 engineering and technology Combustion Industrial and Manufacturing Engineering Methane law.invention Diesel fuel Piston chemistry.chemical_compound 020401 chemical engineering law Natural gas Spark-ignition engine 0202 electrical engineering electronic engineering information engineering 0204 chemical engineering Electrical and Electronic Engineering Civil and Structural Engineering business.industry Mechanical Engineering Building and Construction Mechanics Pollution General Energy chemistry Compression ratio business Lean burn |
| Zdroj: | Energy. 220:119706 |
| ISSN: | 0360-5442 |
| DOI: | 10.1016/j.energy.2020.119706 |
| Popis: | Piston crevices are the major source of hydrocarbon emissions for spark ignition engine. It is similar for natural gas-diesel (NG-diesel) dual fuel engine, maybe even worse in high compression ratio and lean burn NG-diesel engine at low load. The aim of this paper is to numerically investigate combustion and methane emissions of YC-6K NG-diesel engine with different radial clearances. Four piston clearances (0.5 mm, 0.76 mm, 1.0 mm and 1.54 mm) and four different piston geometries were employed. Three diesel-spray-orientated (DSO) piston bowls were designed based on diesel injectors of YC-6K with the purpose of supplying more natural gas and air mixture to diesel spray jets, in addition, a protrusion-ring was designed at the bowl rim of DSO pistons to enhance methane flame propagation. The results showed that both in-cylinder pressure and heat release rate (HHR) of all three DSO pistons increased due to higher turbulence kinetic energy comparing to the original piston design (OPD). Methane emissions of pistons with radial clearance of 0.76 mm were lower than that of other radial clearances for DSO pistons. |
| Databáze: | OpenAIRE |
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