Auto-Ignition and Combustion Properties of Iron/Steel Micro-Particles in Oxygen Atmospheres Heated by Rapid Compression

2012 ◽  
pp. 1-15
Author(s):  
Vladimir V. Leschevich ◽  
Oleg G. Penyazkov ◽  
Jean-Christophe Rostaing
Keyword(s):  
Micro Particles ◽  
Auto Ignition ◽  
Combustion Properties ◽  
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.

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

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

scholarly journals Hypergolic zeolitic imidazolate frameworks (ZIFs) as next-generation solid fuels: Unlocking the latent energetic behavior of ZIFs

2019 ◽  
Vol 5 (4) ◽  
pp. eaav9044 ◽  
Author(s):  
H. M. Titi ◽  
J. M. Marrett ◽  
G. Dayaker ◽  
M. Arhangelskis ◽  
C. Mottillo ◽  
...  
Keyword(s):  
Metal Organic Framework ◽  
Spontaneous Ignition ◽  
Solid Fuels ◽  
Zeolitic Imidazolate Frameworks ◽  
Critical Importance ◽  
Aerospace Applications ◽  
Combustion Properties ◽  
Metal Organic ◽  
Modular Platform ◽  
Ignition And Combustion

Hypergolic materials, capable of spontaneous ignition upon contact with an external oxidizer, are of critical importance as fuels and propellants in aerospace applications (e.g., rockets and spacecraft). Currently used hypergolic fuels are highly energetic, toxic, and carcinogenic hydrazine derivatives, inspiring the search for cleaner and safer hypergols. Here, we demonstrate the first strategy to design hypergolic behavior within a metal-organic framework (MOF) platform, by using simple “trigger” functionalities to unlock the latent and generally not recognized energetic properties of zeolitic imidazolate frameworks, a popular class of MOFs. The herein presented six hypergolic MOFs, based on zinc, cobalt, and cadmium, illustrate a uniquely modular platform to develop hypergols free of highly energetic or carcinogenic components, in which varying the metal and linker components enables the modulation of ignition and combustion properties, resulting in excellent hypergolic response evident by ultrashort ignition delays as low as 2 ms.

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