Abstract




 
   

IJE TRANSACTIONS C: Aspects Vol. 31, No. 6 (June 2018) 1320-1328   

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  EFFECTS OF TRIPLE INJECTION STRATEGIES ON PERFORMANCE AND POLLUTANT EMISSIONS OF A DI DIESEL ENGINE BY USING CFD SIMULATION
 
S. Jafarmadar
 
( Received: September 24, 2017 – Accepted: February 19, 2018 )
 
 

Abstract    One of the main controlling parameters in diesel engine combustion is the fuel – air mixing process that has direct effects on engine performance and pollutant emissions, reviewing over previous literature showed that split injection strategies could satisfy this purpose very well. In this study after achieving successful validation between modeling and experimental results for both single and double injection strategies, optimization of double injection strategy was conducted, in which first pulse of double injection strategy divided in to two pulses, then amount of injected fuel in each pulse kept constant and different delay times between first and second pulse of injections were investigated, for better understanding the processes that were done inside the engine, diagrams of heat release rate, in cylinder temperature, in cylinder pressure, Nox and soot emissions were presented in this paper. Results showed that decreasing the delay time between second and third pulse of injections could decrease the ratio of premixed combustion of third pulse and in optimum cases, reduction in both Nox and soot emissions could be achieved in compared with single and double injection strategies without any significant effects on engine performance, furthermore, triple injection strategy with second pulse of injection that started at 4 CA before top dead center was selected to be the optimum case in reduction of both emissions.

 

Keywords    Diesel Engine, Triple injection, Emissions, Performance.

 




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