Effect of Direct Water Injection Timing on Common Rail Diesel Engine Combustion Process and Efficiency Enhancement

2017 ◽  
Author(s):  
Lang Jiang ◽  
Zhe Kang ◽  
Zhehao Zhang ◽  
Zhijun Wu ◽  
Jun Deng ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Water Injection ◽  
Combustion Process ◽  
Common Rail ◽  
Injection Timing ◽  
Efficiency Enhancement ◽  
Direct Water Injection ◽  
Engine Combustion

INFRARED EXPERIMENTAL INVESTIGATIONS ON THE EFFECTS OF DIRECT WATER INJECTION IN AN OPTICAL ENGINE

2021 ◽  
pp. 1-15
Author(s):  
Amer Farhat ◽  
Taewon Kim ◽  
Ming-Chia Lai ◽  
Marcis Jansons ◽  
Xin Yu
Keyword(s):  
Thermal Stratification ◽  
Water Injection ◽  
Combustion Process ◽  
Combustion Characteristics ◽  
Maximum Temperature ◽  
Experimental Investigations ◽  
Injection Timing ◽  
Residual Water ◽  
Effect Of Water ◽  
Direct Water Injection

Abstract The effects of water injection on combustion characteristics were investigated in an optically-accessible light-duty engine retrofitted with a side-mounted water injector. The main objective was to study the effect of water injection on autoignition and subsequent combustion process in compression ignition engines. Numerical zero-dimensional simulations were first performed to separate the thermal from the kinetic effects of water on the ignition delay and maximum temperature reached by a reacting mixture. Then, experimental investigations were performed at different intake temperatures and levels of thermal stratification achieved via direct water injection. Combustion analysis was performed on cylinder pressure data to study the effect of water injection on the overall combustion process. Infrared imaging was performed to provide insight to how water injection and the resulting water distributions affect thermal stratification, autoignition, and combustion characteristics. A new method in quantifying the water distributions is suggested. The results show that the overall level of stratification is sensitive to water injection timing and pressure, where increased water injection pressures and advanced injection timings result in more homogenous distributions. Moreover, water injection was found to affect the location of ignition kernels and the local presence of water suppressed ignition. The level of water stratification was also observed to affect the combustion process, where more homogenous distributions lost their ability to influence ignition locations. Finally, the infrared images showed high levels of residual water left over from prior water-injected cycles, suggesting that hardware configurations and injection strategies must be optimized to avoid wall wetting for stable engine operation.

Infrared Experimental Investigations on the Effects of Direct Water Injection in an Optical Engine

2020 ◽  
Author(s):  
Amer Farhat ◽  
Taewon Kim ◽  
Ming-Chia Lai ◽  
Marcis Jansons ◽  
Xin Yu
Keyword(s):  
Thermal Stratification ◽  
Water Injection ◽  
Combustion Process ◽  
Combustion Characteristics ◽  
Maximum Temperature ◽  
Experimental Investigations ◽  
Injection Timing ◽  
Residual Water ◽  
Effect Of Water ◽  
Direct Water Injection

Abstract The effects of water injection on combustion characteristics were investigated in an optically-accessible light-duty engine retrofitted with a side-mounted water injector. The main objective was to study the effect of water injection on autoignition and subsequent combustion process in compression ignition engines. Numerical zero-dimensional simulations were first performed to separate the thermal from the kinetic effects of water on the ignition delay and maximum temperature reached by a reacting mixture. Then, experimental investigations were performed at different intake temperatures and levels of thermal stratification achieved via direct water injection. Combustion analysis was performed on cylinder pressure data to study the effect of water injection on the overall combustion process. Infrared imaging was performed to provide insight to how water injection and the resulting water distributions affect thermal stratification, autoignition, and combustion characteristics. A new method in quantifying the water distributions is suggested. The results show that the overall level of stratification is sensitive to water injection timing and pressure, where increased water injection pressures and advanced injection timings result in more homogenous distributions. Moreover, water injection was found to affect the location of ignition kernels and the local presence of water suppressed ignition. The level of water stratification was also observed to affect the combustion process, where more homogenous distributions lost their ability to influence ignition locations. Finally, the infrared images showed high levels of residual water left over from prior water-injected cycles, suggesting that hardware configurations and injection strategies must be optimized to avoid wall wetting for stable engine operation.

scholarly journals Effects of Direct Water Injection on DI Diesel Engine Combustion

2000 ◽  
Author(s):  
F. Bedford ◽  
C. Rutland ◽  
P. Dittrich ◽  
A. Raab ◽  
F. Wirbeleit
Keyword(s):  
Diesel Engine ◽  
Water Injection ◽  
Direct Water Injection ◽  
Engine Combustion ◽  
Di Diesel Engine

scholarly journals Effects of pilot injection timing and EGR on a modern V6 common rail direct injection diesel engine

2013 ◽  
Vol 50 ◽  
pp. 012008 ◽  
Author(s):  
Nik Rosli Abdullah ◽  
Rizalman Mamat ◽  
Miroslaw L Wyszynski ◽  
Anthanasios Tsolakis ◽  
Hongming Xu
Keyword(s):  
Diesel Engine ◽  
Direct Injection ◽  
Common Rail ◽  
Injection Timing ◽  
Pilot Injection ◽  
Direct Injection Diesel Engine

Characterisation of the Injection-Combustion Process in a Common Rail D.I. Diesel Engine Running with Sasol Fischer-Tropsch Fuel

2000 ◽  
Author(s):  
Francisco Payri ◽  
Jean Arrègle ◽  
Carlos Fenollosa ◽  
Gérard Belot ◽  
Alain Delage ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Combustion Process ◽  
Common Rail ◽  
Fischer Tropsch

CFD Modelling of the Effects of Injection Timing on the Combustion Process and Emissions in an HSDI Diesel Engine

2012 ◽  
Author(s):  
Raouf Mobasheri ◽  
Zhijun Peng
Keyword(s):  
Diesel Engine ◽  
High Speed ◽  
Cfd Simulation ◽  
Direct Injection ◽  
Combustion Process ◽  
Injection Timing ◽  
Cfd Modelling ◽  
Combustion Modeling ◽  
Pressure Trace ◽  
Hsdi Diesel Engine

High-Speed Direct Injection (HSDI) diesel engines are increasingly used in automotive applications due to superior fuel economy. An advanced CFD simulation has been carried out to analyze the effect of injection timing on combustion process and emission characteristics in a four valves 2.0L Ford diesel engine. The calculation was performed from intake valve closing (IVC) to exhaust valve opening (EVO) at constant speed of 1600 rpm. Since the work was concentrated on the spray injection, mixture formation and combustion process, only a 60° sector mesh was employed for the calculations. For combustion modeling, an improved version of the Coherent Flame Model (ECFM-3Z) has been applied accompanied with advanced models for emission modeling. The results of simulation were compared against experimental data. Good agreement of calculated and measured in-cylinder pressure trace and pollutant formation trends were observed for all investigated operating points. In addition, the results showed that the current CFD model can be applied as a beneficial tool for analyzing the parameters of the diesel combustion under HSDI operating condition.

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