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Technical Paper

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

2017-10-08
2017-01-2281
The present work aims at optimizing diesel engine combustion efficiency with optimized water injection strategy. The engine had been modified based on a two-cylinder mechanical pump diesel engine into common rail diesel engine with capability of direct water injection. The direct water injection system was designed and manufactured independently. An air-fluid booster was utilized to establish the water injection pressure up to 40MPa. Customized diesel injector was selected to be used as water injector in this study. Water injection strategy was optimized in detail with injection timing around TDC which ranges from 12°CA BTDC to -5°CA BTDC under 10 bar IMEP. The engine efficiency can be improved under selected water injection strategy due to the increment of work fluid in the combustion chamber. Moreover, the nitric oxides emissions show decrement around 10%.
Technical Paper

Simulation of Intake Manifold Water Injection in a Heavy Duty Natural Gas Engine for Performance and Emissions Enhancement

2018-09-10
2018-01-1653
The present work discusses the effects of intake manifold water injection in a six-cylinder heavy duty natural gas (NG) engine through one-dimensional simulation. The numerical study was carried out based on GT-Power under different engine working conditions. The established simulation model was firstly calibrated in detail through the whole engine speed sweep under full load conditions before the model of intake manifold water injector was involved, and the calibration was based on experimental data. The intake manifold water injection mass was controlled through adjustment of intake water/gas (water/natural gas) ratio, a water/gas ratio swept from 0 to 4 was selected to investigate the effects of intake manifold water injection on engine performance and emissions characteristics. On the other hand, the enhancement potential of intake manifold water injection in heavy duty NG engine under lean and stoichiometric condition was also investigated by the alteration of air-fuel ratio.
Technical Paper

Numerical study of Intake Manifold Water Injection on Performance and Emissions in a Heavy-duty Nature Gas Engine

2019-04-02
2019-01-0562
The performance of heavy-duty nature gas engines has been limited by combustion temperature and NOx emissions for a long time. Recently, water injection technology has been widely considered as a technical solution in reducing fuel consumption and emissions simultaneously in both diesel and gasoline engines. This paper focuses on the impacts of intake manifold water injection on characteristics of combustion and emissions in a heavy-duty nature gas engine through numerical methods. A detailed numerical model was established and validated with experimental data of pressure traces in CFD software coupled with detailed chemical kinetics. The simulation was mainly carried out under low speed and full load condition, and knock level was also measured and calculated by Logarithmic Knock Intensity (LKI). The results show that intake manifold water injection is an efficient way to reduce high NOX emissions in nature gas engines without deteriorating other emissions characteristics.
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