A DNS study of ignition characteristics of a lean PRF/air mixture with CH2O and H2O2 addition under HCCI combustion-relevant conditions

2021 ◽  
Vol 234 ◽  
pp. 111654
Author(s):  
Jong Hak Kim ◽  
Gwang Hyeon Yu ◽  
Suk Ho Chung ◽  
Chun Sang Yoo
Keyword(s):  
Hcci Combustion ◽  
Ignition Characteristics ◽  
H2o2 Addition

Effect of Premixed Diesel Fuel on Partial HCCI Combustion Characteristics

2014 ◽  
Vol 663 ◽  
pp. 26-33
Author(s):  
Y.H. Teoh ◽  
H.H. Masjuki ◽  
M.A. Kalam ◽  
Muhammad Afifi Amalina ◽  
H.G. How
Keyword(s):  
Diesel Fuel ◽  
Engine Speed ◽  
Direct Injection ◽  
Compression Ignition ◽  
Cylinder Pressure ◽  
Compression Ignition Engine ◽  
Hcci Combustion ◽  
Light Duty ◽  
Auto Ignition ◽  
Ignition Characteristics

This study investigated the effects of premixed diesel fuel on the auto-ignition characteristics in a light duty compression ignition engine. A partial homogeneous chargecompression ignition (HCCI) engine was modified from a single cylinder, four-stroke, direct injection compression ignition engine. The partial HCCI is achieved by injecting diesel fuel into the intake port of the engine, while maintaining diesel fuel injected in cylinder for combustion triggering. The auto-ignition of diesel fuel has been studied at various premixed ratios from 0 to 0.60, under engine speed of 1600 rpm and 20Nm load. The results for performance, emissions and combustion were compared with those achieved without premixed fuel. From the heat release rate (HRR) profile which was calculated from in-cylinder pressure, it is clearly observed that two-stage and three-stage ignition were occurred in some of the cases. Besides, the increases of premixed ratio to some extent have significantly reduced in NO emission.

Hydrogen Peroxide Effect on HCCI Performance

2001 ◽  
Author(s):  
Cüneyt Uykur ◽  
Andrew L. Zuccato ◽  
Graham T. Reader ◽  
David S.-K. Ting
Keyword(s):  
Hydrogen Peroxide ◽  
Internal Combustion Engines ◽  
Kinetic Mechanism ◽  
Chemical Kinetic ◽  
Operating Conditions ◽  
Combustion Engines ◽  
Flexible Control ◽  
Hcci Combustion ◽  
Stirred Reactor ◽  
H2o2 Addition

Abstract Methane fueled Homogeneous Charged Compression Ignition (HCCI) combustion is investigated using detailed kinetic modeling. Control of heat release rate is identified as the biggest challenge against HCCI operation. A new control strategy, hydrogen peroxide (H2O2) addition, along with intake mixture preheating, is proposed to resolve this problem. A single-zone perfectly stirred reactor type formulation is employed with detailed chemical kinetic mechanism to predict homogeneous gas-phase chemical kinetics. The effects of H2O2 addition on the performance parameters of a methane-fueled HCCI engine are simulated. The results show that HCCI performance can be improved radically by the addition of H2O2 since it lowers the ignition delay time substantially. The resulting NOx concentration in high IMEP operating conditions is significantly less than that emitted from conventional internal combustion engines. Possibility of increasing NOx emissions with increasing initial temperature has been shown. Reduction in carbon monoxide emission is predicted with the addition of H2O2 via the increased hydroxyl chemistry. More flexible control of HCCI operation is possible by regulating the amount of H2O2 added.

MECHANISM AND CHARACTERISTICS OF GEL FUEL IGNITION

2020 ◽  
Author(s):  
O. S. Gaydukova ◽  
◽  
D. O. Glushkov ◽  
A. G. Nigay ◽  
A. G. Kosintsev ◽  
...  
Keyword(s):  
Thermal Power ◽  
Aerospace Industry ◽  
Theory Development ◽  
Liquid Fuels ◽  
Ignition Characteristics ◽  
Deformable Materials ◽  
Combustion Processes ◽  
Thermal Power Engineering ◽  
Storage Processes ◽  
Emulsions And Suspensions

Recently, prospective direction of the combustion theory development is the preparation of fuel compositions and study of the composite fuels ignition characteristics, for example, in the form of emulsions and suspensions. Such fuels and their combustion processes are characterized by higher environmental, energy, economic, and operational properties. Of great interest is the use of gel fuels prepared by thickening emulsions and suspensions to the state of elastically deformable materials for the aerospace industry and thermal power engineering. Gel fuels have advantages over widespread liquid fuels in environmental and fire safety aspects of storage processes, transportation, and combustion.

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