Study on Auto-Ignition Characteristics of High Pressure Methane Jet for Compression Ignition Engine Application

2018 ◽  
Author(s):  
Tae Kyung Lee ◽  
Hyungeun Min ◽  
Han Ho Song
Keyword(s):  
High Pressure ◽  
Compression Ignition ◽  
Compression Ignition Engine ◽  
Auto Ignition ◽  
Ignition Characteristics

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.

Performance of multi-dimensional models for simulating diesel premixed charge compression ignition engine combustion using low- and high-pressure injectors

2005 ◽  
Vol 6 (5) ◽  
pp. 475-486 ◽  
Author(s):  
S-C Kong ◽  
Y Ra ◽  
R D Reitz
Keyword(s):  
High Pressure ◽  
Low Temperature ◽  
Spray Angle ◽  
Low Temperature Combustion ◽  
Compression Ignition ◽  
Compression Ignition Engine ◽  
Detailed Chemistry ◽  
Engine Combustion ◽  
Temperature Combustion ◽  
Hsdi Diesel Engine

An engine CFD model has been developed to simulate premixed charge compression ignition (PCCI) combustion using detailed chemistry. The numerical model is based on the KIVA code that is modified to use CHEMKIN as the chemistry solver. The model was applied to simulate ignition, combustion, and emissions processes in diesel engines operated to achieve PCCI conditions. Diesel PCCI experiments using both low- and high-pressure injectors were simulated. For the low-pressure injector with early injection (close to intake valve closure), the model shows that wall wetting can be minimized by using a pressure-swirl atomizer with a variable spray angle. In the case of using a high-pressure injector, it is found that late injection (SOI = 5 ° ATDC) benefits soot emissions as a result of low-temperature combustion at highly premixed conditions. The model was also used to validate the emission reduction potential of an HSDI diesel engine using a double injection strategy that favours PCCI conditions. It is concluded that the present model is useful to assess future engine combustion concepts, such as PCCI and low-temperature combustion (LTC).

Chemical and spectroscopic studies of blue flames in the auto-ignition of methane

1955 ◽  
Vol 230 (1180) ◽  
pp. 1-19 ◽  
Keyword(s):  
Spectroscopic Studies ◽  
Compression Ignition ◽  
Low Temperature Oxidation ◽  
Compression Ignition Engine ◽  
Temperature Oxidation ◽  
Carbon Particles ◽  
Cool Flames ◽  
Auto Ignition ◽  
Increasing Temperature ◽  
Normal Flame

A blue pre-ignition glow has been found with weak methane + air mixtures, using a motored compression-ignition engine with fixed compression ratio and speed; the temperature was controlled by preheating the inlet air. The limits of the glow and its transition to normal flame have been studied. Analyses of exhaust products and records of pressure and luminosity have been made. The spectrum of the glow shows formaldehyde bands, normally associated with cool flames. As the normal ignition limit is approached this spectrum changes smoothly, with increasing temperature or mixture strength, to a normal flame spectrum showing OH, CH and HCO bands. Using a stroboscope we have found slight indication that the CH 2 O bands precede the CH and OH. Less lean mixtures show yellow luminosity, associated with carbon particles. The possibilities that the CH 2 O emission results from polymerization of the methane, from partial oxidation to methyl alcohol, or directly from a cool-flame phenomenon in methane, are discussed in relation to conditions in the combustion chamber. The new observation of CH 2 O bands from methane may be interpreted in favour of its formation by reactions of methoxy radicals. Methane is known to knock in an engine at high compression ratios. Present results suggest that low-temperature oxidation processes may, as with other hydrocarbons, contribute to this knock.

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