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Concept study - lower exhaust gas temperature in Scania buses
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
2013 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Konceptstudie – Sänka avgastemperaturen i Scanias bussar (Swedish)
Abstract [en]

The thesis aims to lower the exhaust gas temperature on the coming EU6 Scania buses D7 and Otto gas and is carried out as a final part of the studies in the mechanical engineering program, KTH Stockholm. Euro 6, a new emission standard requirements for heavy duty trucks and buses, puts new demands on the amount of particulate matter and nitrogen oxides that can be emitted. This led to that Scania has developed and improved their after treatment systems. The new after treatment systems generates high exhaust temperatures, and Scania have expressed a desire to reduce these to create a safer environment around the bus.The thesis started with a thorough feasibility study, where the current exhaust systems and its components were studied. Solutions to lower exhaust temperatures were studied, both in the automotive industry and in other fields. The concepts that were developed would be analyzed through CFD simulations, why basic fluid mechanics were studied. Two different exhaust systems were to be analyzed, one with a gas engine and roof outlet and one with a diesel engine and ground outlet. A total of eight concepts were presented, in which five were determined to undergo CFD simulations.A competitor analysis was conducted in which three different diffusers from competing bus and truck manufacturers were CFD simulated.The results showed that the diffusers were superior to the other concepts. The diffuser designed in this project performed well in comparison to the diffusers from competing bus and trucks manufacturers, but it was considered to be expensive and difficult to manufacture. New diffuser designs were suggested, which are believed to have the same good qualities but cheaper to manufacture. The authors recommend Scania to perform field tests of the redesigned diffusers, and also try the ones designed by their competitors. Also, Scania should investigate how a venturi solution can be optimized.

Abstract [sv]

Examensarbetet, vars mål är att sänka avgastemperaturen på Scanias bussar, är genomfört som en avslutande del av studierna på maskinkonstruktionsprogrammet, KTH Stockholm. EuroVI, en ny emissionskravsstandard för tunga fordon, ställer nya krav på hur mycket partiklar och kväveoxider som får släppas ut. Detta har resulterat i att Scania har utvecklat och förbättrat sina efterbehandlingssystem. De nya efterbehandlingssystemen ger upphov till höga avgastemperaturer, och Scania har uttryckt en önskan att sänka dessa för att skapa en säker miljö runt bussen.Examensarbetet började med en grundlig förstudie, där de aktuella avgassystemen och dess komponenter studerades. Lösningar för att sänka avgastemperaturer studerades, både inom fordonsindustrin och inom andra områden. Eftersom koncepten som togs fram skulle analyseras med CFD simuleringar, så studerades även grundläggande strömningsmekanik. Två olika avgassystem skulle analyseras, ett med en gasmotor och takutsläpp, och ett med en dieselmotor och markutsläpp. Totalt togs åtta koncept fram, varav fem ansågs intressanta för CFD simulering. Det gjordes även en konkurrentanalys, där tre olika diffusorer från konkurrerande buss- och lastbilstillverkare CFD simulerades.Resultaten visade att diffusorerna var överlägsna de andra koncepten. Diffusorn som utformats i detta projekt stod sig väl mot konkurrenternas diffusorer, men ansågs dock vara dyr och svår att tillverka. Nya designer togs fram, som anses ha samma temperatursänkande egenskaper men vara enklare att tillverka. Författarna till denna rapport rekommenderar Scania att gå vidare med fysiska tester av de förslagna diffusorerna, och att även testa konkurrenternas diffusorer. Scania bör även undersöka hur en venturilösning kan optimeras.

Place, publisher, year, edition, pages
2013. , 91 p.
Series
MMK 2013:28 MKN 090
Keyword [en]
Exhaust gas temperature reduction, diffuser, bus, EuroVI, venturi, CFD
Keyword [sv]
Avgastemperaturssänkning, buss, diffusor, EuroVI, CFD
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-141775OAI: oai:DiVA.org:kth-141775DiVA: diva2:698369
Supervisors
Examiners
Available from: 2015-10-14 Created: 2014-02-21 Last updated: 2015-10-14Bibliographically approved

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