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Heat Loss Analysis of a Steel Piston and a YSZ Coated Piston in a Heavy-Duty Diesel Engine Using Phosphor Thermometry 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: 0000-0001-5931-9743
Lund University.ORCID iD: 0000-0002-9914-7218
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Internal Combustion Engines.
Show others and affiliations
2017 (English)In: SAE International Journal of Engines, ISSN 1946-3936, E-ISSN 1946-3944, Vol. 10, no 4, p. 1954-1968Article in journal (Refereed) Published
Abstract [en]

Diesel engine manufacturers strive towards further efficiency improvements. Thus, reducing in-cylinder heat losses is becoming increasingly important. Understanding how location, thermal insulation, and engine operating conditions affect the heattransfer to the combustion chamber walls is fundamental for the future reduction of in-cylinder heat losses. This study investigates the effect of a 1mm-thick plasma-sprayed yttria-stabilized zirconia (YSZ) coating on a piston. Such a coated piston and a similar steel piston are compared to each other based on experimental data for the heat release, the heat transfer rate to the oil in the piston cooling gallery, the local instantaneous surface temperature, and the local instantaneous surface heat flux. The surface temperature was measured for different crank angle positions using phosphor thermometry. The fuel was chosen to be n-heptane to facilitate surface temperature measurements during non-skip-fire, thermally stabilized operating conditions. Assuming one-dimensional heat transfer inside each piston, the local instantaneous surface heat flux was calculated using the heat transfer rate to the oil in the piston cooling gallery and the surface temperature measurements. The results from this study show that the surface temperature variation is similar for both pistons. The instantaneous heat flux during combustion is however significantly greater for the steel piston than the coated piston. The heat release analysis also indicates that combustion is slower for the piston with the yttria-stabilized zirconia coating.

Place, publisher, year, edition, pages
SAE International , 2017. Vol. 10, no 4, p. 1954-1968
Keywords [en]
phosphor thermometry; heat losses; diesel engines; thermal barrier coating; TBC
National Category
Vehicle Engineering Energy Engineering
Research subject
Engineering Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-254606DOI: 10.4271/2017-01-1046ISI: 000416807900053Scopus ID: 2-s2.0-85018343474OAI: oai:DiVA.org:kth-254606DiVA, id: diva2:1334193
Projects
Heat losses during diesel 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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