Investigation on the influence of nozzle orifice position under conditions of ultra-high pressure multi-pulse injection and PCCI combustion

The compression ignition engine has the highest thermal efficiency compared to other internal combustion engines. However, combustion also results in significant amounts of soot and NOx emissions. Soot and NOx emissions can be reduced simultaneously by adopting premixed charge compression ignition (...

Full description

Saved in:
Bibliographic Details
Published in:AIP conference proceedings 2024-05, Vol.3086 (1)
Main Authors: Ewphun, Pop-Paul, Nagasawa, Tsuyoshi, Kosaka, Hidenori, Sato, Susumu
Format: Article
Language:English
Subjects:
Chemiluminescence
Efficiency
Emissions
Flame temperature
Ignition
Impingement
Internal combustion engines
Nitrogen oxides
Nozzles
Orifices
Soot
Thermodynamic efficiency
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The compression ignition engine has the highest thermal efficiency compared to other internal combustion engines. However, combustion also results in significant amounts of soot and NOx emissions. Soot and NOx emissions can be reduced simultaneously by adopting premixed charge compression ignition (PCCI) combustion. Unfortunately, PCCI combustion is difficult to manage in terms of ignition time and has a restricted operating range. The combination of ultra-high injection pressure and multi-pulse injection shows the promise of controlling PCCI combustion, reducing emissions and improving thermal efficiency. Unfortunately, increased impingement from ultra-high injection pressure reduces thermal efficiency due to increased impingement. The penetration of the spray must be decreased in order to address this problem. By applying an offset orifice nozzle, the problem can be solved. An offset orifice nozzle was created by moving the orifice aliment from the sac’s center to the periphery of the sac in the direction of the swirl. The offset orifice nozzle was given a counter bore design to maintain the same constant orifice length as the regular nozzle. The experiments were conducted on a single-cylinder engine both with and without optical access. Three equally distributed main injection pulses at varied injection pressures from 150 to 350 MPa were used. An advanced rate of heat release was provided by the offset orifice nozzle. The offset orifice nozzle, however, produces a slightly greater flame temperature with a wider flame area. Additionally, it offers a broader, more intense OH* chemiluminescence region, particularly for the 2nd and 3rd injections.
ISSN:0094-243X
1551-7616
DOI:10.1063/5.0205280