Simulation of Heavy Fuel Spray and Combustion in a Medium Speed Diesel Engine

Taskinen, Pertti; Karvinen, R.; Liljenfeldt, Gösta; Salminen, Heikki J.

doi:10.4271/962053

Cited by 10 publications

(2 citation statements)

References 7 publications

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“…This is important especially in the case of heavy-duty diesel engines, for which the testing of various designs and components constitutes a considerable and costly effort. Today, predictive numerical modelling can also significantly help in reducing the time and cost needed for the development of engines [12][13][14][15]. Because it is a quantitative parameter, the spatially and temporally resolved flame temperature is also valuable in validating the results of numerical modelling.…”

Section: Introductionmentioning

confidence: 99%

A system for quantitative imaging diagnostics and its application to pyrometric in-cylinder flame-temperature measurements in large diesel engines

Vattulainen

Nummela

Hernberg

et al. 2000

Meas. Sci. Technol.

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This paper describes the development and a demanding field application of a double charge-coupled device (CCD) camera system, which allows simultaneous imaging at two different wavelength bands through common front-end optics. The imaging system has been assembled using two 1280 × 1024-pixel, 12-bit digital cameras together with standard, commercially available optical components for image splitting and filtering. The pixel resolution and wavelength separation of the system can be changed according to the requirements of the given application and the basic optical set-up can be used together with a variety of different types of front-end optics. The construction and performance of the double-camera system are described, together with preliminary experimental results from applying the system to in-cylinder combustion diagnostics of heavy-duty size-class, direct-injection diesel engines. To provide optical access into the combustion chamber of series-production-type engines, endoscope-based optics were used together with the camera system. Images taken at the two separate wavelength bands were used to calculate pyrometric diesel flame temperatures based on the blackbody radiation of the soot contained in the flame. The measurement system has been applied to engines with cylinder bores ranging from 20 cm up to 64 cm, delivering 0.15-1.6 MW power per cylinder during the measurements. In this paper specific results from measurements with Wärtsilä 4L20 and 6L32 engines are reported. These engines have 20 and 32 cm cylinder bores, respectively. In addition to the two-colour flame-temperature measurements, spectrally resolved measurements were performed to investigate a cloud-like, self-luminous phenomenon that was observed above the piston top even prior to the injection of fuel into these engines. This phenomenon was associated with the evaporating and chemically reacting fuel that originates from the residues which have been carried onto the piston top from the previous cycles. For the in-cylinder measurements reported here, the production-type test engines were only slightly modified to accept the endoscopic optics. During the measurements the engines were operated with realistic diesel fuels and other operation parameters. To the best of our knowledge, there have been no previous corresponding measurements reported in the literature for diesel engines of this size.

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Section: Introductionmentioning

confidence: 99%

A system for quantitative imaging diagnostics and its application to pyrometric in-cylinder flame-temperature measurements in large diesel engines

Vattulainen

Nummela

Hernberg

et al. 2000

Meas. Sci. Technol.

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“…This paper focuses on structural analysis and dynamics, however the right boundary and loading conditions are needed, and can often be provided by CFD simulations. These theses [63][64][65][66][67][68][69] present some of the early CFD simulations.…”

Section: Starting From the Seventies And Continuing In The Eightiesmentioning

confidence: 99%

History of structural analysis & dynamics of Wärtsilä medium speed engines

Frondelius¹,

Tienhaara²,

Haataja³

2018

RakMek

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This paper opens up the history of structural analysis and dynamics simulations of Wärtsilä engines. It cites already published articles and theses with some backgrounds information. It also discusses some of the backgrounds of the in-house tool development. Additionally, this paper presents the development of the computers and investment of the simulation capacity in order to understand how it has been the enabler of ever more complicated models. It lists the work done during fifty decades. The authors sincerely attempt to make this article as reader-friendly as possible, even though there are over 220 references, which of course demonstrates how dedicated Wärtsilä has been in supporting numerical simulations research in the past fivedecades.

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Combustion modelling for direct injection diesel engines

Micklow

Gong

2001

Proceedings of the Institution of Mechanical Engineers, Part D:

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Successful modelling of combustion systems depends on an adequate as well as a computationally eYcient description of the reaction mechanisms. For a typical medium speed compression ignition direct injection (CIDI ) engine under normal operating conditions, from 70 to 95 per cent of the injected fuel is in the vapour phase at the start of combustion and 10-35 per cent of the vaporized fuel has mixed to within ammability limits. This indicates that both a premixed combustion mechanism and a diVusion combustion mechanism are important to model CIDI engines. In the early stages of combustion, a premixed combustion mechanism should be utilized while, late in the combustion process, a diVusion-based mechanism will be dominant. The former is chemically based, while the latter is physically based. In this article, the two combustion mechanisms mentioned above and various combinations of the two mechanisms for the intermediate stages of combustion are investigated. The study was done on a Caterpillar 3401 diesel engine. It was found that by utilizing a hybrid scheme whereby the premixed combustion mechanism is employed up to a user-speci ed crank angle, beyond which point a diVusion combustion method is utilized, reasonable agreement for both in-cylinder pressure and heat release rate with experimental data could be obtained.

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Simulation of Heavy Fuel Spray and Combustion in a Medium Speed Diesel Engine

Cited by 10 publications

References 7 publications

A system for quantitative imaging diagnostics and its application to pyrometric in-cylinder flame-temperature measurements in large diesel engines

A system for quantitative imaging diagnostics and its application to pyrometric in-cylinder flame-temperature measurements in large diesel engines

History of structural analysis & dynamics of Wärtsilä medium speed engines

Combustion modelling for direct injection diesel engines

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