Experimental Investigation into Thermal and Chemical Effects of Negative Valve Overlap Injection in a Gasoline HCCI Engine

2014 ◽  
Author(s):  
Jacek Hunicz ◽  
Pawel Kordos ◽  
Piotr Ignaciuk
Keyword(s):  
Experimental Investigation ◽  
Hcci Engine ◽  
Chemical Effects ◽  
Negative Valve Overlap ◽  
Valve Overlap

scholarly journals An applicable approach to mitigate pressure rise rate in an HCCI engine with negative valve overlap

2020 ◽  
Vol 257 ◽  
pp. 114018 ◽  
Author(s):  
Jacek Hunicz ◽  
Maciej Mikulski ◽  
Michal S. Geca ◽  
Arkadiusz Rybak
Keyword(s):  
Pressure Rise ◽  
Pressure Rise Rate ◽  
Hcci Engine ◽  
Rise Rate ◽  
Negative Valve Overlap ◽  
Valve Overlap

Study on knocking combustion in a diesel HCCI engine with fuel injection in negative valve overlap

Fuel ◽  
2013 ◽  
Vol 106 ◽  
pp. 478-483 ◽  
Author(s):  
Lei Shi ◽  
Kangyao Deng ◽  
Yi Cui ◽  
Shuan Qu ◽  
Wei Hu
Keyword(s):  
Fuel Injection ◽  
Hcci Engine ◽  
Negative Valve Overlap ◽  
Valve Overlap

scholarly journals Numerical investigation into the effect of direct fuel injection on thermal stratification in HCCI engine

2017 ◽  
Vol 169 (2) ◽  
pp. 137-140
Author(s):  
Michał GĘCA ◽  
Jacek HUNICZ ◽  
Piotr JAWORSKI
Keyword(s):  
Combustion Chamber ◽  
Thermal Stratification ◽  
Fuel Injection ◽  
Injection Timing ◽  
Ignition Timing ◽  
Hcci Engine ◽  
Auto Ignition ◽  
Negative Valve Overlap ◽  
Valve Overlap ◽  
Direct Fuel Injection

Despite the fact that HCCI engines are distinguished by mixture homogeneity, some degree of stratification always appears inside a combustion chamber. It is especially applied to residual effect engines utilizing negative valve overlap. Mixture stratification is a result of the imperfect mixing of fresh air with trapped residuals. Direct fuel injection introduces stratification as well, due to fuel vaporization. As a consequence, the temperature within the combustion chamber is uneven. Thermal stratification affects auto-ignition timing and combustion evolution in a high extent. The purpose of this study was to evaluate a degree of thermal stratification in HCCI engine utilizing negative valve overlap. Investigations were performed using three-dimensional CFD model of the combustion system, made by using AVL FIRE software. Simulations were realized for various timings of fuel injection into the cylinder. It was found that fuel injection timing had a significant effect on the thermal stratification and resulting auto-ignition timing.

scholarly journals Optical Study of Flow and Combustion in an HCCI Engine with Negative Valve Overlap

2006 ◽  
Vol 45 ◽  
pp. 94-103 ◽  
Author(s):  
Trevor S Wilson ◽  
Hongming Xu ◽  
Steve Richardson ◽  
Miroslaw L Wyszynski ◽  
Thanos Megaritis
Keyword(s):  
Optical Study ◽  
Hcci Engine ◽  
Negative Valve Overlap ◽  
Valve Overlap
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