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Volume 15
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10.3390/en15134674
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Article

Computational Investigation on the Performance Increase of a Small Industrial Diesel Engine Regarding the Effects of Compression Ratio, Piston Bowl Shape and Injection Strategy

by
Raphael Hatz
*,
Alexander Lukas
,
Andreas Zepf
and
Malte Jaensch
Institute of Sustainable Mobile Drivetrains, Technical University Munich, Schragenhofstr. 31, 80992 Munich, Germany
*
Author to whom correspondence should be addressed.
Energies 2022, 15(13), 4674; https://doi.org/10.3390/en15134674
Submission received: 29 May 2022 / Revised: 21 June 2022 / Accepted: 22 June 2022 / Published: 25 June 2022
(This article belongs to the Special Issue CASES Vehicles and the Mobility of the Next Generation)
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Abstract

This paper describes the simulative approach to calibrate an already extremely highly turbocharged industrial diesel engine for higher low-speed torque. The engine, which is already operating at its cylinder-pressure maximum, is to achieve close to 30 bar effective mean pressure through suitable calibration between the compression ratio, piston-bowl shape and injection strategy. The basic idea of the study is to lower the compression ratio for even higher injection masses and boost pressures, with the resulting disadvantages in the area of emissions and fuel consumption being partially compensated for by optimizations in the areas of piston shape and injection strategy. The simulations primarily involve the use of the 3D CFD software Converge CFD for in-cylinder calibration and a fully predictive 1D full-engine model in GT Suite. The simulations are based on a two-stage turbocharged 1950 cc four-cylinder industrial diesel engine, which is used for validation of the initial simulation. With the maximum increase in fuel mass and boost pressure, the effective mean pressure could be increased up to 28 bar, while specific consumption increased only slightly. Depending on the geometry, NOx or CO and UHC emissions could be reduced.
Keywords: diesel; CFD simulation; internal-combustion engine; piston bowl; compression ratio; emissions; specific fuel consumption; brake mean effective pressure diesel; CFD simulation; internal-combustion engine; piston bowl; compression ratio; emissions; specific fuel consumption; brake mean effective pressure

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MDPI and ACS Style

Hatz, R.; Lukas, A.; Zepf, A.; Jaensch, M. Computational Investigation on the Performance Increase of a Small Industrial Diesel Engine Regarding the Effects of Compression Ratio, Piston Bowl Shape and Injection Strategy. Energies 2022, 15, 4674. https://doi.org/10.3390/en15134674

AMA Style

Hatz R, Lukas A, Zepf A, Jaensch M. Computational Investigation on the Performance Increase of a Small Industrial Diesel Engine Regarding the Effects of Compression Ratio, Piston Bowl Shape and Injection Strategy. Energies. 2022; 15(13):4674. https://doi.org/10.3390/en15134674

Chicago/Turabian Style

Hatz, Raphael, Alexander Lukas, Andreas Zepf, and Malte Jaensch. 2022. "Computational Investigation on the Performance Increase of a Small Industrial Diesel Engine Regarding the Effects of Compression Ratio, Piston Bowl Shape and Injection Strategy" Energies 15, no. 13: 4674. https://doi.org/10.3390/en15134674

APA Style

Hatz, R., Lukas, A., Zepf, A., & Jaensch, M. (2022). Computational Investigation on the Performance Increase of a Small Industrial Diesel Engine Regarding the Effects of Compression Ratio, Piston Bowl Shape and Injection Strategy. Energies, 15(13), 4674. https://doi.org/10.3390/en15134674

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