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Phosphor Thermometry for In-Cylinder Surface Temperature Measurements in Diesel Engines
KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Förbränningsmotorteknik. Scania CV AB.ORCID-id: 0000-0002-1003-0700
Lund University.
Lund University.ORCID-id: 0000-0002-9914-7218
2019 (engelsk)Inngår i: Measurement science and technology, ISSN 0957-0233, E-ISSN 1361-6501Artikkel i tidsskrift (Annet vitenskapelig) Submitted
Abstract [en]

Surface temperature measurements in technically relevant applications can be very  hallenging and yet of great importance. Phosphor thermometry is a temperature measurement technique that has previously been employed in technically relevant applications to obtain surface temperature. The technique is based on temperature-dependent changes in a phosphor’s luminescence. To improve the accuracy and precision of temperature measurements with this technique, the present study considers, by way of example, the impact of conditions inside the cylinder of a diesel engine on decay time based phosphor thermometry. After an initial, general assessment of the effect of prevailing measurement conditions, this research investigates errors caused by soot luminosity, extinction, signal trapping and changes of phosphors’ luminescence properties due to exposure to the harsh environment. Furthermore, preferable properties of phosphors which are suitable for in-cylinder temperature measurements are discussed. 16 phosphors are evaluated, including four which – to the authors’ knowledge –have previously not been used in thermometry. Results indicate that errors due to photocathode bleaching, extinction, signal trapping and changes of luminescence properties may cause an erroneous temperature evaluation with temperature errors in the order of serval tens of Kelvin.

sted, utgiver, år, opplag, sider
2019.
Emneord [en]
phosphor thermometry, temperature measurement, diesel engine, phosphor
HSV kategori
Forskningsprogram
Energiteknik; Fysik; Farkostteknik
Identifikatorer
URN: urn:nbn:se:kth:diva-254922OAI: oai:DiVA.org:kth-254922DiVA, id: diva2:1336097
Prosjekter
Heat losses during CI combustion
Forskningsfinansiär
Swedish Energy Agency, 38370-1Swedish Research Council, 2017-02974
Merknad

QC 20190806

Tilgjengelig fra: 2019-07-09 Laget: 2019-07-09 Sist oppdatert: 2019-08-06bibliografisk kontrollert
Inngår i avhandling
1. Experiments on Heat Transfer During Diesel Combustion Using Optical Methods
Åpne denne publikasjonen i ny fane eller vindu >>Experiments on Heat Transfer During Diesel Combustion Using Optical Methods
2019 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
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.

sted, utgiver, år, opplag, sider
Stockholm: KTH Royal Institute of Technology, 2019. s. 131
Serie
TRITA-ITM-AVL ; 2019:23
Emneord
Heat transfer, Internal combustion engines, Phosphor thermometry
HSV kategori
Forskningsprogram
Maskinkonstruktion
Identifikatorer
urn:nbn:se:kth:diva-255657 (URN)978-91-7873-263-0 (ISBN)
Disputas
2019-09-20, F3, Lindstedtsvägen 26, Stockholm, 10:00 (engelsk)
Opponent
Veileder
Forskningsfinansiär
Swedish Energy Agency, 38370-1
Merknad

QC 20190806,

Tilgjengelig fra: 2019-08-30 Laget: 2019-08-05 Sist oppdatert: 2019-09-02bibliografisk kontrollert

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