scholarly journals Study on Characteristics of Auto-ignition and Combustion in Hydrogen Jet with a Rapid Compression and Expansion

2009 ◽  
Vol 4 (2) ◽  
pp. 395-408 ◽  
Author(s):  
Taku TSUJIMURA ◽  
Keita MITSUSHIMA ◽  
Ryuichi HATA ◽  
Yoshiroh TOKUNAGA ◽  
Jiro SENDA ◽  
...  
Keyword(s):  
Auto Ignition ◽  
Compression And Expansion ◽  
Rapid Compression ◽  
Ignition And Combustion

scholarly journals Study on Characteristics of Auto-ignition and Combustion in Hydrogen Jet with a Rapid Compression and Expansion Machine

2008 ◽  
Vol 74 (739) ◽  
pp. 746-753
Author(s):  
Keita MITSUSHIMA ◽  
Ryuichi HATA ◽  
Taku TUJIMURA ◽  
Yoshiro TOKUNAGA ◽  
Jiro SENDA ◽  
...  
Keyword(s):  
Auto Ignition ◽  
Compression And Expansion ◽  
Rapid Compression ◽  
Ignition And Combustion

Experimental study of pre-chamber jet ignition in a rapid compression machine and single-cylinder natural gas engine

2019 ◽  
pp. 146808741988378
Author(s):  
Fubai Li ◽  
Ziqing Zhao ◽  
Boyuan Wang ◽  
Zhi Wang
Keyword(s):  
Natural Gas ◽  
Experimental Results ◽  
Orifice Diameter ◽  
Rapid Compression Machine ◽  
Jet Flame ◽  
Gas Engine ◽  
Natural Gas Engine ◽  
Auto Ignition ◽  
Rapid Compression ◽  
Ignition And Combustion

Pre-chamber jet ignition is a promising combustion technology to achieve fast combustion in natural gas engines. First, the ignition and combustion characteristics of mixtures in a pre-chamber system with different diameter orifices were studied under engine-relevant pressures and temperatures in a rapid compression machine. The tested fuels, CH4/air stoichiometric mixtures, were diluted by different proportions of CO2/N2 to simulate the corresponding exhaust gas recirculation conditions in engines. High-speed photography was applied to visualize the jet ignition and combustion processes. The experimental results revealed that two ignition patterns existed in the pre-chambers depending on the diameter of orifices. Pre-chamber jet flame ignition pattern appeared when the orifice diameter of the pre-chamber exceeded a critical value, which produced jet flame and ignited the mixtures in the main chamber directly. Pre-chamber jet auto-ignition pattern produced jet which promoted the auto-ignition of mixture in the main chamber when the orifice diameter was smaller and presented much shorter combustion durations. Based on the experimental results in the rapid compression machine, a practical pre-chamber system was designed in a single-cylinder natural gas engine to investigate the combustion performance and emission characteristics. The experimental results indicated appropriate 0.8%–1.4% increases of indicated thermal efficiency were achieved by pre-chamber jet ignition due to the higher combustion efficiency and shorter combustion duration compared to conventional spark ignition. Lower total hydrocarbon and CO emissions but higher NO x emissions were produced by pre-chamber jet ignition due to the faster burning velocity and higher combustion temperature.

Experimental Investigation and Analysis of Auto-Ignition Combustion Dynamics

2018 ◽  
Author(s):  
Abhinav Tripathi ◽  
Chen Zhang ◽  
Zongxuan Sun
Keyword(s):  
Ignition Delay ◽  
Internal Combustion Engines ◽  
Path Dependence ◽  
Fuel Mixture ◽  
Reaction Rates ◽  
Chemical Kinetic ◽  
Combustion Dynamics ◽  
Auto Ignition ◽  
Compression And Expansion ◽  
Rapid Compression

From engine controls’ perspective, understanding autoignition dynamics is a key to enabling new combustion modes for internal combustion engines, especially for renewable fuels. Conventional autoignition investigations of fuels commonly involve a rapid compression of oxidizer-fuel mixture to a desired set of temperature-pressure conditions in a rapid compression machine (RCM), and subsequent measurement of the ignition delay. However, even for relatively close thermal states at the compressed condition, different thermodynamic paths (pressure-temperature histories) may lead to significantly different chemical kinetic states and hence significantly different ignition delay measurements. Currently, there exists no systematic method to study this path dependence of auto-ignition. In this work we present, for the first time, a systematic framework for investigation of the effect of small perturbations in the thermo-kinetic states, caused by perturbing the thermodynamic path of compression, on the ignition delay of fuels from a dynamical systems perspective. First, we introduce a novel controlled trajectory rapid compression and expansion machine (CT-RCEM) which offers the ability to precisely control the piston trajectory during compression of the fuel-oxidizer mixture, allowing the thermodynamic path to be tailored as desired. We use the CT-RCEM to experimentally investigate the influence of compression trajectory perturbation on the ignition delay of a specific fuel — dimethyl-ether (DME). Next, using a reduced order model of the combustion dynamics in the CT-RCEM that we developed, we investigate the evolution of the perturbation in the thermo-kinetic states resulting from trajectory perturbation to explain the experimental observations. Finally, we show that the sensitivity of auto-ignition to the thermodynamic path perturbation essentially arises from changes in the chemical reaction rates due to different amounts of intermediate species buildup for different thermodynamic paths.

Comparison between Flat and Creviced Pistons in a Controlled Trajectory Rapid Compression and Expansion Machine (CT-RCEM)

2021 ◽  
Author(s):  
Krishna Chandra C. Bavandla ◽  
Abhinav Tripathi ◽  
Dezhi Zhou ◽  
Zongxuan Sun ◽  
Suo Yang
Keyword(s):  
Compression And Expansion ◽  
Rapid Compression

scholarly journals Analysis of rapid compression machine facility effects on the auto-ignition of ethanol

Fuel ◽  
2020 ◽  
Vol 264 ◽  
pp. 116546 ◽  
Author(s):  
Chaitanya Wadkar ◽  
Prasanna Chinnathambi ◽  
Elisa Toulson
Keyword(s):  
Rapid Compression Machine ◽  
Auto Ignition ◽  
Rapid Compression
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