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Experimental Determination of the Heat Transfer Coefficient in Piston Cooling Galleries
Scania CV AB.ORCID iD: 0000-0002-1003-0700
Scania CV AB.
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Internal Combustion Engines.
2018 (English)In: SAE Technical Papers, ISSN 0148-7191Article in journal (Refereed) Published
Abstract [en]

Piston cooling galleries are critical for the pistons’ capability to handle increasing power density while maintaining the same level of durability. However, piston cooling also accounts for a considerable amount of heat rejection and parasitic losses. Knowing the distribution of the heat transfer coefficient (HTC) inside the cooling gallery could enable new designs which ensure effective cooling of areas decisive for durability while minimizing parasitic losses and overall heat rejection. In this study, an inverse heat transfer method is presented to determine the spatial HTC distribution inside the cooling gallery based on surface temperature measurements with an infrared (IR) camera. The method utilizes a piston specially machined so it only has a thin sheet of material of a known thickness left between the cooling gallery and the piston bowl. The piston - initially at room temperature - is heated up with warm oil injected into the cooling gallery. The transient of the piston’s outer surface temperature is captured with an IR camera from the top. Combining the temperature transient of each pixel, the HTC is later obtained through an inverse heat transfer solver based on one-dimensional heat conduction inside the piston material. To the authors’ knowledge, the current study presents the first application of an inverse heat transfer method for spatially resolved and experimentally determined heat transfer coefficients inside a piston cooling gallery. Preliminary measurements at standstill to demonstrate the method display an area of increased heat transfer where the entering oil jet impinges onto the wall of the cooling gallery.

Place, publisher, year, edition, pages
Heidelberg, Germanay, 2018.
Keywords [en]
Piston cooling gallery, IR camera, Heat transfer coefficient
National Category
Energy Engineering Fluid Mechanics and Acoustics Vehicle Engineering
Research subject
Engineering Mechanics; Energy Technology
Identifiers
URN: urn:nbn:se:kth:diva-254662DOI: 10.4271/2018-01-1776Scopus ID: 2-s2.0-85056842855OAI: oai:DiVA.org:kth-254662DiVA, id: diva2:1334585
Conference
SAE 2018 International Powertrains, Fuels and Lubricants Meeting, FFL 2018; Heidelberg; Germany; 17 September 2018 through 19 September 2018
Projects
Heat
Note

QC 20190806

Available from: 2019-07-03 Created: 2019-07-03 Last updated: 2019-10-14Bibliographically 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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