Effect of Piston Crevices on 3D Simulation of a Heavy-Duty Diesel Engine Retrofitted to Natural Gas Spark Ignition

2018 ◽  
Author(s):  
Iolanda Stocchi ◽  
Jinlong Liu ◽  
Cosmin E. Dumitrescu ◽  
Michele Battistoni ◽  
Carlo Nazareno Grimaldi
Keyword(s):  
Fuel Injection ◽  
Direct Injection ◽  
Combustion Model ◽  
Heavy Duty ◽  
Ic Engine ◽  
Pressure Trace ◽  
Heavy Duty Diesel Engine ◽  
Heavy Duty Diesel ◽  
Flame Behavior ◽  
Experimental Pressure

3D CFD IC engine simulations that use a simplified combustion model based on the flamelets concept can provide acceptable results with minimum computational costs and reasonable running times. More, the simulation can neglect small combustion chamber details such as valve crevices, valve recesses and piston crevices volume. The missing volumes are usually compensated by changes in the squish volume (i.e., by increasing the clearance height of the model compared to the real engine). This paper documents some of the effects that such an approach would have on the simulated results of the combustion phenomena inside a conventional heavy-duty direct-injection CI engine, which was converted to port-fuel injection SI operation. 3D IC engine simulations with or without crevice volumes were run using the G-equation combustion model. A proper parameter choice ensured that the simulation results agreed well with the experimental pressure trace. The results show that including the crevice volume affected the mass of unburned mixture inside the squish region, which in turn influenced the flame behavior and heat release during late-combustion stages.

Effect of Piston Crevices on the Numerical Simulation of a Heavy-Duty Diesel Engine Retrofitted to Natural-Gas Spark-Ignition Operation

2019 ◽  
Vol 141 (11) ◽  
Author(s):  
Iolanda Stocchi ◽  
Jinlong Liu ◽  
Cosmin Emil Dumitrescu ◽  
Michele Battistoni ◽  
Carlo Nazareno Grimaldi
Keyword(s):  
Heat Release ◽  
Fuel Injection ◽  
Combustion Engine ◽  
Direct Injection ◽  
Three Dimensional ◽  
Spark Ignition ◽  
Combustion Model ◽  
Heavy Duty ◽  
Compression Ignition Engine ◽  
Heavy Duty Diesel

Three-dimensional computational fluid dynamics internal combustion engine simulations that use a simplified combustion model based on the flamelet concept provide acceptable results with minimum computational costs and reasonable running times. Moreover, the simulation can neglect small combustion chamber details such as valve crevices, valve recesses, and piston crevices volume. The missing volumes are usually compensated by changes in the squish volume (i.e., by increasing the clearance height of the model compared to the real engine). This paper documents some of the effects that such an approach would have on the simulated results of the combustion phenomena inside a conventional heavy-duty direct injection compression-ignition engine, which was converted to port fuel injection spark ignition operation. Numerical engine simulations with or without crevice volumes were run using the G-equation combustion model. A proper parameter choice ensured that the numerical results agreed well with the experimental pressure trace and the heat release rate. The results show that including the crevice volume affected the mass of a unburned mixture inside the squish region, which in turn influenced the flame behavior and heat release during late-combustion stages.

Relation between hydroxyl and formaldehyde in a direct-injection heavy-duty diesel engine

2011 ◽  
Vol 158 (3) ◽  
pp. 564-572 ◽  
Author(s):  
A.J. Donkerbroek ◽  
A.P. van Vliet ◽  
L.M.T. Somers ◽  
N.J. Dam ◽  
J.J. ter Meulen
Keyword(s):  
Diesel Engine ◽  
Direct Injection ◽  
Heavy Duty ◽  
Heavy Duty Diesel Engine ◽  
Heavy Duty Diesel

Thermo Mechanical Analysis of a Direct Injection Heavy Duty Diesel Engine Piston Using FEA

2016 ◽  
Author(s):  
Islam Ismail ◽  
Ahmed Emara ◽  
El Sayed Abdel Razek
Keyword(s):  
Heat Transfer ◽  
Finite Element Analysis ◽  
Direct Injection ◽  
Heavy Duty ◽  
Element Analysis ◽  
Engine Piston ◽  
Heavy Duty Diesel Engine ◽  
Heavy Duty Diesel ◽  
Cylinder Bore ◽  
Engine Power

This paper involves simulation of a 4-stroke direct injection heavy duty diesel engine piston made of aluminum silicon alloy to determine its temperature field, stress distribution and deformation at the conditions of upgrading the engine power from 300 HP to 350 HP. Turbocharger is the way used to enhance the engine power from 300 HP to 350 HP beside improving the fuel injection system. When the engine power is upgraded, high temperature and pressure will be developed because the engine will run at high loads. The piston is subjected to the coupled action of the thermal effect due to the transfer of heat from the head to the body and the mechanical effect represented by the combustion pressure and the inertial load due to the important change of direction of the piston in the cylinder bore. This results in producing stresses in the piston and if these stresses exceed the designed values, the failure of the piston is the result. Finite element analysis (FEA) is considered as one of the best numerical tools to model and analyze the physical systems. The three dimensional piston model was developed in Solid-Works and imported into ANSYS software. Finite element analysis is considered Code for preprocessing, loading and post processing. The simulation parameters used in this paper were combustion pressure, inertial effects and temperature. Diesel RK software is used to simulate the thermal analysis of engine cycle at each case of engine power 300 HP and 350 HP. Also, this model included the effect of the heat flow on the piston to overcome the whole area of the piston is used to illustrate the temperature distribution on the total area of the piston. This area divided into piston surface area and sidle area of piston which included the groves of rings (pressure and oil). The heat transfer coefficient is determined in each area of the piston according to the mechanism of heat transfer. Finally, the results of two different piston conditions are compared with each other. The highest temperature appeared at the combustion chamber side which occurred at the edges of the piston top face in direct contact with the hot gases in the radial. The piston deformation value is within a safe margin and below the gap between the piston and the cylinder bore in case of engine power of 350 HP. The highest calculated value of stresses was below the yield stress of the piston material at elevated temperatures and engine brake power of 350 HP. Hence the piston would withstand the induced stresses during work cycles.

scholarly journals Evaluation of intake charge hydrogen enrichment in a heavy-duty diesel engine

2017 ◽  
Vol 232 (1) ◽  
pp. 139-147 ◽  
Author(s):  
Emad Monemian ◽  
Alasdair Cairns ◽  
Mark Gilmore ◽  
David Newman ◽  
Keith Scott
Keyword(s):  
Fuel Injection ◽  
Pressure Rise ◽  
Transport Sector ◽  
Heavy Duty ◽  
Indicated Mean Effective Pressure ◽  
Heavy Duty Vehicle ◽  
Heavy Duty Diesel Engine ◽  
Heavy Duty Diesel ◽  
To Come ◽  
Diesel Fuel Injection

Concerns over CO2 emissions and global warming continue to enforce the transport sector to reduce the fuel consumption of heavy duty diesel goods vehicles as one of the major contributors of CO2. Such powertrain platforms look set to remain the dominant source of heavy duty vehicle propulsion for decades to come. The currently reported work was concerned with experimental evaluation of the potential to partially displace diesel with hydrogen fuel, which continues to attract attention as a potential longer term alternative fuel solution, whether produced on-board or remotely via sustainable methods. The single cylinder engine adopted was of 2.0 litre capacity, with common rail diesel fuel injection and exhaust gas recirculation (EGR) typical of current production technology. The work involved fumigation of H2 into the engine intake system at engine loads typically visited under real world driving conditions. Highest practical hydrogen substitution ratios increased indicated efficiency by up to 4.6% at 6 bar net indicated mean effective pressure (IMEPn) and 2.4% at 12 bar IMEPn. In 6bar IMEPn, CO2, CO and soot all reduced by 58%, 83% and 58% respectively while the corresponding reduction of these emissions in 12 bar IMEPn, were 27%, 45% and 71% respectively toward diesel-only baseline. Under such conditions the use of a pre-injection prior to the main diesel injection was essential to control the heat release and pressure rise rates.

Application of Common Rail Fuel Injection System to a Heavy Duty Diesel Engine

1994 ◽  
Author(s):  
Yoshihisa Yamaki ◽  
Kazutoshi Mori ◽  
Hiroshi Kamikubo ◽  
Susumu Kohketsu ◽  
Kohji Mori ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Fuel Injection ◽  
Common Rail ◽  
Injection System ◽  
Fuel Injection System ◽  
Heavy Duty ◽  
Heavy Duty Diesel Engine ◽  
Heavy Duty Diesel

Direct Injection of Natural Gas in a Heavy-Duty Diesel Engine

2002 ◽  
Author(s):  
James Harrington ◽  
Sandeep Munshi ◽  
Costi Nedelcu ◽  
Patric Ouellette ◽  
Jeff Thompson ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Natural Gas ◽  
Direct Injection ◽  
Heavy Duty ◽  
Heavy Duty Diesel Engine ◽  
Heavy Duty Diesel
Sign in / Sign up

Export Citation Format

Share Document