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Study on heat losses during flame impingement in a diesel engine using phosphor thermometry surface temperature measurements
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)In: SAE Technical Papers, ISSN 0148-7191Article in journal (Refereed) Published
Abstract [en]

In-cylinder heat losses in diesel engines decrease engine efficiency significantly and account for approximately 14-19% [1, 2, 3] of the injected fuel energy. A great part of the heat losses during diesel combustion presumably arises from the flame impingement onto the piston. Therefore, the present study investigates the heat losses during flame impingement onto the piston bowl wall experimentally. The measurements were performed on 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 flame was determined by evaluating a phosphor's temperature dependent emission decay. Simultaneous cylinder pressure measurements and high-speed videos are associated to the surface temperature measurements in each cycle. Thus, surface temperature readings could be linked to specific impingement and combustion events. The results showed a sharp increase of the surface temperature during the flame impingement and an abrupt decrease as the flame disappeared.

Place, publisher, year, edition, pages
Detroit, United States: SAE International , 2019.
Keywords [en]
Phosphor thermometry; diesel engine; heat losses; flame impingement
National Category
Energy Engineering Vehicle Engineering
Research subject
Energy Technology; Engineering Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-254622DOI: 10.4271/2019-01-0556Scopus ID: 2-s2.0-85064646818OAI: oai:DiVA.org:kth-254622DiVA, id: diva2:1334272
Conference
SAE World Congress Experience, WCX 2019; Cobo CenterDetroit; United States; 9 April 2019 through 11 April 2019
Projects
Heat losses during CI combustion
Funder
Swedish Energy Agency, 38370-1
Note

QC 20190806

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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