Effect of Piston Bowl Shape and Swirl Ratio on Engine Heat Transfer in a Light-Duty Diesel Engine

2014 ◽  
Author(s):  
Helgi Skuli Fridriksson ◽  
Martin Tuner ◽  
Oivind Andersson ◽  
Bengt Sunden ◽  
Hakan Persson ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Diesel Engine ◽  
Swirl Ratio ◽  
Piston Bowl ◽  
Light Duty

scholarly journals Characterization of Flow Asymmetry During the Compression Stroke Using Swirl-Plane PIV in a Light-Duty Optical Diesel Engine with the Re-entrant Piston Bowl Geometry

2015 ◽  
Vol 8 (4) ◽  
pp. 1837-1855 ◽  
Author(s):  
Kan Zha ◽  
Stephen Busch ◽  
Paul C. Miles ◽  
Sameera Wijeyakulasuriya ◽  
Saurav Mitra ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Piston Bowl ◽  
Compression Stroke ◽  
Flow Asymmetry ◽  
Light Duty

A Computational Investigation of Piston Bowl Geometry and Injector Spray Pattern Effects on Gasoline Compression Ignition in a Heavy-Duty Diesel Engine

2019 ◽  
Author(s):  
Yu Zhang ◽  
Yuanjiang Pei ◽  
Meng Tang ◽  
Michael Traver
Keyword(s):  
Diesel Engine ◽  
Fuel Efficiency ◽  
Compression Ignition ◽  
Swirl Ratio ◽  
Heavy Duty ◽  
Load Range ◽  
Spray Pattern ◽  
Piston Bowl ◽  
Heavy Duty Diesel Engine ◽  
Heavy Duty Diesel

Abstract This study computationally investigates the potential of utilizing gasoline compression ignition (GCI) in a heavy-duty diesel engine to address a future ultra-low tailpipe NOx standard of 0.027 g/kWh while achieving high fuel efficiency. By conducting closed-cycle, full-geometry, 3-D computational fluid dynamics (CFD) combustion simulations, the effects of piston bowl geometry, injector spray pattern, and swirl ratio (SR) were investigated for a market gasoline. The simulations were performed at 1375 rpm over a load range from 5 to 15 bar BMEP. The engine compression ratio (CR) was increased from 15.7 used in previous work to 16.5 for this study. Two piston bowl concepts were studied with Design 1 attained by simply scaling from the baseline 15.7 CR piston bowl, and Design 2 exploring a wider and shallower combustion chamber design. The simulation results predicted that through a combination of the wider and shallower piston bowl design, a 14-hole injector spray pattern, and a swirl ratio of 1, Design 2 would lead to a 2–7% indicated specific fuel consumption (ISFC) improvement over the baseline by reducing the spray-wall interactions and lowering the in-cylinder heat transfer loss. Design 1 (10-hole and SR2) showed a more moderate ISFC reduction of 1–4% by increasing CR and the number of nozzle holes. The predicted fuel efficiency benefit of Design 2 was found to be more pronounced at low to medium loads.

scholarly journals Swirl ratio and post injection strategies to improve late cycle diffusion combustion in a light-duty diesel engine

2017 ◽  
Vol 123 ◽  
pp. 365-376 ◽  
Author(s):  
Jesús Benajes ◽  
Jaime Martín ◽  
Antonio García ◽  
David Villalta ◽  
Alok Warey
Keyword(s):  
Diesel Engine ◽  
Diffusion Combustion ◽  
Post Injection ◽  
Swirl Ratio ◽  
Light Duty ◽  
Injection Strategies

scholarly journals Impact of swirl on in-cylinder heat transfer in a light-duty diesel engine

Energy ◽  
2017 ◽  
Vol 119 ◽  
pp. 1010-1023 ◽  
Author(s):  
Alberto Broatch ◽  
Pablo Olmeda ◽  
Antonio García ◽  
Josep Salvador-Iborra ◽  
Alok Warey
Keyword(s):  
Heat Transfer ◽  
Diesel Engine ◽  
Light Duty

The Impact of Swirl Ratio and Injection Pressure on Fuel-Air Mixing in a Light-Duty Diesel Engine

2012 ◽  
Author(s):  
Dipankar Sahoo ◽  
Benjamin R. Petersen ◽  
Paul C. Miles
Keyword(s):  
Diesel Engine ◽  
Heat Release ◽  
Mixture Distribution ◽  
Injection Pressure ◽  
Operating Mode ◽  
Swirl Ratio ◽  
Rich Mixture ◽  
Light Duty ◽  
Start Of Injection ◽  
The Impact

Toluene fuel-tracer laser-induced fluorescence is employed to quantitatively measure the equivalence ratio distributions in the cylinder of a light-duty diesel engine operating in a low-temperature, high-EGR, and early-injection operating mode. Measurements are made in a non-combusting environment at crank angles capturing the mixture preparation period: from the start-of-injection through the onset of high-temperature heat release. Three horizontal planes are considered: within the clearance volume, the bowl rim region, and the lower bowl. Swirl ratio and injection pressure are varied independently, and the impact of these parameters on the mixture distribution is correlated to the heat release rate and the engine-out emissions. As the swirl ratio or injection pressure is increased, the amount of over-lean mixture in the upper central region of the combustion chamber, in the bowl rim region and above, also increases. Unexpectedly, increased injection pressure results in a greater quantity of over-rich mixture within the squish volume.

scholarly journals Evaluation of thermal barrier coatings and surface roughness in a single-cylinder light-duty diesel engine

2019 ◽  
pp. 146808741987583 ◽  
Author(s):  
Joop Somhorst ◽  
Michael Oevermann ◽  
Mirko Bovo ◽  
Ingemar Denbratt
Keyword(s):  
Heat Transfer ◽  
Surface Roughness ◽  
Diesel Engine ◽  
Thermal Barrier Coatings ◽  
Heat Losses ◽  
Operating Conditions ◽  
Thermal Barrier ◽  
Barrier Coatings ◽  
Single Cylinder ◽  
Light Duty

The effect of two thermal barrier coatings and their surface roughness on heat transfer, combustion, and emissions has been investigated in a single-cylinder light-duty diesel engine. The evaluated thermal barrier coating materials were plasma-sprayed yttria-stabilized zirconia and hard anodized aluminum, which were applied on the piston top surface. The main tool for the investigation was cylinder pressure analysis of the high-pressure cycle, from which the apparent rate of heat release, indicated efficiency, and heat losses were derived. For verification of the calculated wall heat transfer, the heat flow to the piston cooling oil was measured as well. Application of thermal barrier coatings can influence engine operating conditions like charge temperature and ignition delay. Therefore, extra attention was paid to choosing stable and repeatable engine operating points. The experimental data were modeled using multiple linear regression to isolate the effects of the coatings and of the surface roughness. The results from this study show that high surface roughness leads to increased wall heat losses and a delayed combustion. However, these effects are less pronounced at lower engine loads and in the presence of soot deposits. Both thermal barrier coatings show a reduction of cycle-averaged wall heat losses, but no improvement in indicated efficiency. The surface roughness and thermal barrier coatings had a significant impact on the hydrocarbon emissions, especially for low-load engine operation, while their effect on the other exhaust emissions was relatively small.

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