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Comparison of heat losses at the impingement point and in between two impingement points in a diesel engine using phosphor thermometry
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Internal Combustion Engines. Scania CV AB.ORCID iD: 0000-0002-1003-0700
Lund University.ORCID iD: 0000-0001-8072-599X
Lund University.ORCID iD: 0000-0002-9914-7218
Scania CV AB.
2019 (English)Conference paper, Published paper (Refereed)
Abstract [en]

In-cylinder heat losses in diesel engines reduce engine efficiency significantly and account for a considerable amount of injected fuel energy. A great part of the heat losses during diesel combustion presumably arises from the impingement of the flame. The present study compares the heat losses at the point where the flame impinges onto the piston bowl wall and the heat losses between two impingement points. Measurements were performed in a full metal heavy-duty diesel engine with a small optical access through a removed exhaust valve. The surface temperature at the impingement point of the combusting diesel spray and at a point in between two impingement points was determined using phosphor thermometry. The dynamic heat fluxes and the heat transfer coefficients which result from the surface temperature measurements are estimated. Simultaneous cylinder pressure measurements and high-speed videos are associated to individual surface temperature measurements. Thus each surface temperature measurement is linked to a specific impingement and combustion events. An analysis of the surface temperature in connection with the high speed images reveals the great impact of flame impingement on instantaneous local heat flux at the impingement point. Absence of such an effect in between two impingement points implies an inhomogeneous temperature field.

Place, publisher, year, edition, pages
Kyoto, Japan, 2019.
Keywords [en]
Phosphor thermometry, diesel engines, heat losses, flame impingement
National Category
Energy Engineering Vehicle Engineering
Research subject
Energy Technology; Engineering Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-254626OAI: oai:DiVA.org:kth-254626DiVA, id: diva2:1334279
Conference
JSAE/SAE 2019 International Powertrains, Fuels and Lubricants Meeting, August 26 - 29 2109
Projects
Heat losses during CI combustion
Funder
Swedish Energy Agency, 38370-1
Note

QC 20190819

Available from: 2019-07-02 Created: 2019-07-02 Last updated: 2019-08-06Bibliographically approved
In thesis
1. Experiments on Heat Transfer During Diesel Combustion Using Optical Methods
Open this publication in new window or tab >>Experiments on Heat Transfer During Diesel Combustion Using Optical Methods
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Transportation is a crucial part of modern societies. This includes their economies. Trade and the transportation of goods have a great influence on prosperity. Nevertheless, the transportation sector with road transport in particular is heavily dependent on fossil fuels and emits a significant amount of greenhouse gases. One approach to mitigate the negative environmental impact of road transport is to increase the efficiency of its most common propulsion system, that is the internal combustion engine. Due to its dominant role in the road freight transportation sector, this thesis directs its attention to heavy-duty diesel engines. In-cylinder heat losses are one of the main factors that reduce engine efficiency. Therefore, the objective of this thesis is to gain a better understanding of the processes that influence in-cylinder heat losses by resolving them in time and space using optical methods. In diesel engines, most of the in-cylinder heat losses are transferred to the piston. As a result, this thesis focuses specifically on that component.

In this research project, the task to determine in-cylinder heat losses to the piston in heavy-duty diesel engines is divided into two parts. The most important part consists of fast surface temperature measurements on the piston using phosphor thermometry. The heat transfer coefficient inside the piston cooling gallery defines an additional steady-state boundary condition.

The work presented in this thesis includes therefore efforts to improve in-cylinder surface temperature measurements and an assessment of their accuracy and precision. Furthermore, it comprises of experimental results from measurements on steel pistons and a piston with an insulating thermal barrier coating. Results reveal spatial differences of the heat transfer during diesel combustion. Measurements at the impingement point indicate a strong influence of flame impingement on local heat transfer. A correlation is detected between heat transfer and cycle-to-cycle variations of flame impingement.

The thesis also reports efforts to determine the heat transfer coefficient inside the piston cooling gallery. Using an infrared camera a method is presented to spatially resolve convective heat transfer inside this cooling channel.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2019. p. 131
Series
TRITA-ITM-AVL ; 2019:23
Keywords
Heat transfer, Internal combustion engines, Phosphor thermometry
National Category
Other Mechanical Engineering
Research subject
Machine Design
Identifiers
urn:nbn:se:kth:diva-255657 (URN)978-91-7873-263-0 (ISBN)
Public defence
2019-09-20, F3, Lindstedtsvägen 26, Stockholm, 10:00 (English)
Opponent
Supervisors
Funder
Swedish Energy Agency, 38370-1
Note

QC 20190806,

Available from: 2019-08-30 Created: 2019-08-05 Last updated: 2019-09-02Bibliographically approved

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