Affiliation:
1. Purdue University, School of Aeronautics and Astronautics, USA
2. Aramco Americas, Aramco Research Center-Detroit, USA
Abstract
<div>This study investigates the behavior of pre-chamber knock in comparison to
traditional spark ignition engine knock, using a modified constant-volume
gasoline engine with an optically accessible piston. The aim is to provide a
deeper understanding of pre-chamber knock combustion and its potential for
mitigating knock. Five passive pre-chambers with different nozzle diameters,
volumes, and nozzle numbers were tested, and nitrogen dilution was varied from
0% to 10%. The stochastic nature of knock behavior necessitates the use of
statistical methods, leading to the proposal of a high-frequency band-pass
filter (37–43 kHz) as an alternative pre-chamber knock metric. Pre-chamber knock
combustion was found to exhibit fewer strong knock cycles compared to SI
engines, indicating its potential for mitigating knock intensity. High-speed
images revealed pre-chamber knock primarily occurs near the liner, where end-gas
knock is typically exhibited. The study identified that increasing pre-chamber
nozzle diameter resulted in a larger dispersion of knock cycles and more severe
knock intensity, likely due to shorter jet penetration depth requiring more time
for end-gas consumption. Strategies for mitigating knock in pre-chamber
combustion systems include reducing the pre-chamber volume for a fixed A/V ratio
and increasing dilution level. The results of this study offer valuable insights
for developing effective knock mitigation approaches in pre-chamber combustion
systems, contributing to the advancement of more efficient and reliable
engines.</div>
Subject
Fuel Technology,Automotive Engineering,General Earth and Planetary Sciences,General Environmental Science
Cited by
1 articles.
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