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Impulsmätning medelst gradvis deflektion av alla sprayer från högtrycks common rail spridare
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
2007 (Swedish)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Impulse measuring by gradual deflection of all sprays from high pressure common rail injectors (English)
Abstract [en]

A method for measuring the total impulse from a multi hole diesel injector, introduced in

previous thesis work, “Development of a method and a device for measuring the momentum

rate of fuel sprays”, by Mikael Lindström, has been further developed and tested. The concept

is to simultaneously deflect all sprays from a multi hole diesel injector by using a bell shaped

deflector. The fuel sprays are deflected straight down from their initial umbrella angle, and

the resulting deflection force is measured in a thin strained section of the load cell. The strain

is given by three strain gauges, with quarter-bridge circuitry for each gauge. The load cell has

been redesigned in this thesis to lessen disturbances in the impulse measurements observed in

previous thesis. The natural frequencies of the load cell have successfully been elevated, and

the mounting has been further developed. New sources of disturbances have been identified,

and a deeper insight in the measurement circumstances has been gained. Suggestions on how

to avoid certain disturbances and lower others are included, together with new design and

modification proposals. A general discussion about impulse measurements is also included.

Abstract [sv]

En metod för att mäta den totala impulsen från en multihålsspridare, introducerad i ett tidigare

examensarbete, ”Development of a method and a device for measuring the momentum rate of

fuel sprays”, har vidareutvecklats och testats. Metodens koncept är att simultant avlänka alla

sprayer från en multihålsspridare genom att använda en klockformad deflektor.

Bränslesprayerna avlänkas lodrät nedåt från den ursprungliga paraplyvinkeln, och den så

resulterande kraften mäts i en tunnväggig, töjd del av mätcellen. Töjningen ges av tre

töjningsgivare, var och en kopplad i kvartsbryggekonfiguration. Mätcellen har i detta

examensarbete omdesignats för att minska de störningar som kunde observeras hos

impulsmätningarna i föregående examensarbete. Vidare har egenfrekvenserna hos mätcellen

höjts och monteringsanordningen vidareutvecklats. Nya störningskällor har identifierats och

en djupare insikt om rådande mätförhållanden har nåtts. Förslag om hur vissa störningar

undviks och andra kan minskas är inkluderade, tillsammans med rekommenderade

modifikationer och nya designförslag. Därtill förs också generell diskussion om

impulsmätning.

Place, publisher, year, edition, pages
2007.
Series
MMK 2007:52 MFM105
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-100856OAI: oai:DiVA.org:kth-100856DiVA: diva2:545531
External cooperation
Scania CV AB,Jonas Holmborn
Uppsok
Technology
Supervisors
Examiners
Available from: 2012-08-20 Created: 2012-08-20 Last updated: 2012-08-20Bibliographically approved

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Johan Runesson(2377 kB)148 downloads
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