Particulates from a CNG DI SI Engine during Warm-Up
Paper in proceeding, 2021
The results show that PN was strongly influenced by changes in coolant water temperature in both the CNG DI and GDI systems. However, the CNG DI engine generated 1 to 2 orders of magnitude lower PN than the GDI system at all tested temperatures. The PN decreased in both systems when the coolant temperature increased. The results also show that PN was sensitive to a broader engine coolant temperature range in the GDI system. However, PN was around two orders of magnitude higher at the lowest coolant temperature (15 °C) than at the highest temperature (90 °C) in the CNG DI system. In homogeneous CNG combustion (unlike gasoline combustion) high-speed video images revealed no diffusion or yellow flame anywhere in the cylinder, even at the lowest coolant temperature. Thus, no soot formation location could be determined from the images in CNG cases. Overall, engine measurements showed that the CNG DI engine emitted lower standard emissions (CO2, CO, HC, NOx) and PN than the GDI system across the experimental range of engine coolant temperatures.
Author
Mindaugas Melaika
Chalmers, Mechanics and Maritime Sciences (M2), Combustion and Propulsion Systems
Sreelekha Etikyala
Chalmers, Mechanics and Maritime Sciences (M2), Combustion and Propulsion Systems
Petter Dahlander
Chalmers, Mechanics and Maritime Sciences (M2), Combustion and Propulsion Systems
SAE Technical Papers
01487191 (ISSN) 26883627 (eISSN)
Vol. 2021 2021online, USA,
48V Mild Hybrid with Direct Injection Biogas Engine
Swedish Energy Agency (P44829-1), 2017-10-02 -- 2021-09-30.
Subject Categories
Other Mechanical Engineering
Energy Engineering
Fluid Mechanics and Acoustics
DOI
10.4271/2021-01-0630