The Effects of Using Formaldehyde as an Additive on the Performance of an HCCI Engine Fueled With Natural Gas

Author(s):  
Omid Jahanian ◽  
Seyed Ali Jazayeri

In this paper, the performance of a natural gas HCCI engine is studied through a thermodynamic model including detailed chemical kinetics. Then the influence of using formaldehyde as an additive on the engine characteristics has been investigated. Results show that it is possible to change engine working limits using this additive. Furthermore, there is an optimum additive content for each operating condition which leads to higher output work and power. It is also shown that the air/fuel mixture will ignite earlier using this additive so it is conceivable to reduce inlet mixture temperature resulting in better performance due to higher volumetric efficiency.

Author(s):  
N.V. Kukshinov ◽  
S.N. Batura ◽  
M.S. Frantsuzov

This paper deals with numerical simulation of combustion of a hydrogen-air mixture in a supersonic flow. The simulation is based on solving the complete system of Navier-Stokes equations with closure using the turbulence model and detailed chemical kinetics. The mixing and combustion of a hydrogen-air fuel mixture is considered in the experimental formulation of Beach-Evans-Schexnayder. The effect of various kinetic mechanisms, turbulence models, TCI models, and boundary conditions on the solution is studied qualitatively and quantitatively. The relative errors of mass concentration of water for control sections are determined, and the methods’ boundaries are shown. Conclusions are drawn on the influence of turbulent mixing mechanisms and chemical kinetics on the combustion of hydrogen.


2010 ◽  
Author(s):  
Karthik V. Puduppakkam ◽  
Long Liang ◽  
Anthony Shelburn ◽  
Chitralkumar V. Naik ◽  
Ellen Meeks ◽  
...  

Fuel ◽  
2020 ◽  
Vol 264 ◽  
pp. 116841 ◽  
Author(s):  
C. Schluckner ◽  
C. Gaber ◽  
M. Landfahrer ◽  
M. Demuth ◽  
C. Hochenauer

Author(s):  
Chengke Liu ◽  
Ghazi A. Karim

A CFD multi-dimensional computational approach has been developed through a combination of a modified KIVA3 code together with a detailed chemical kinetics scheme for the oxidation of n-heptane in air while considering the effects of turbulence. The effects of adding different quantities of hydrogen, methane and carbon monoxide to the heptane on the combustion characteristics of the HCCI engine under different conditions were investigated both experimentally and numerically. The effects of changes in the combustion chamber wall surface temperature on the combustion characteristics of the HCCI engine were examined. It was found that the presence with n-heptane of some hydrogen, methane or carbon monoxide could delay to various extents the autoignition, while changes in the values of the combustion chamber wall temperature influence the autoignition timing and its initial location. It is suggested that the supplementing of the liquid fuel with gaseous fuels and/or application of a suitable glow-plug surface of optimum size and location fitted with temperature control may aid in controlling the combustion process of an HCCI engine while obtaining higher power output without producing knock.


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