Fuel Injection System Simulation with Renewable Diesel Fuels

Tilli, Aki; Kaario, Ossi; Imperato, Matteo; Larmi, Martti

doi:10.4271/2009-24-0105

Cited by 11 publications

(6 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Consequently, the spray tip penetration is possibly more influenced by injection parameters and unsteady engine cylinder conditions during the post-injection cycle. Also, some earlier studies 21,24 show no significant differences in liquid spray tip penetration when different fuels were studied.…”

Section: Optical Engine Studiesmentioning

confidence: 84%

“…In their study, difference in injection delay was relatively small, 4-10 ms, with higher injection pressure of 1000 bar. Probably, the small difference is the reason why some earlier studies by Seykens et al, 19 Boudy and Seers 20 and Tilli et al 21 showed negligible difference in injection delay and actual injection timing when FAME was compared with petroleum diesel. The authors [19][20][21] concluded that injection delay is not sensitive to the bulk modulus of compressibility in modern common-rail injection contrary to mechanical pump-in-line nozzle injection that was studied by Yamane et al 22 and Boehman et al 23 Contrary to FAME, use of paraffinic fuels, such as hydro-treated vegetable oil (HVO) and Fischer-Tropsch (FT) diesel fuels, decreased oil dilution in some studies, 9 whereas some other studies 5 reported increased oil dilution.…”

Section: Introductionmentioning

confidence: 94%

“…Lower viscosity causes lower SMD and wider spray cone angle. According to earlier studies, [17][18][19][20][21][22][23] physical properties of fuel affect the injection delay of nozzle that represents time between electric start of injection and the actual start of injection when a fuel is injected out of the nozzle orifices. The possible variation of bulk modulus between the tested fuels should not have a major influence in a modern common-rail engine.…”

Section: Optical Engine Studiesmentioning

confidence: 99%

“…The possible variation of bulk modulus between the tested fuels should not have a major influence in a modern common-rail engine. [18][19][20][21] Lower viscosity is related to shorter inner delay of nozzle. 18 In earlier studies, density of fuel is related to the spray tip penetration.…”

Section: Optical Engine Studiesmentioning

confidence: 99%

“…Also, some contradictory results were found when FAME and paraffinic fuels were studied. 5,9,[17][18][19][20][21][22][23][24][25]…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Late post-injection of biofuel blends in an optical diesel engine: Experimental and theoretical discussion on the inevitable wall-wetting effects on oil dilution

Hulkkonen

Tilli

Kaario

et al. 2016

International Journal of Engine Research

Self Cite

View full text Add to dashboard Cite

In a diesel engine, diesel particulate filter is used to reduce particle matter emissions. Diesel particulate filter requires periodic regenerations under high-temperature conditions in the exhaust pipe in order to oxidize the accumulated soot. A common strategy to produce high exhaust gas temperature is to inject late post-injections after the main injection. However, this practice may dilute the engine oil, causing engine wear. Biofuel addition to petroleum diesel may increase oil dilution even more. This is related to the fuel spray characteristics, the post-injection control and the vaporization process of fuel in engine oil. In this study, spray properties of late post-injection were studied with petroleum diesel and two types of transport biofuel blends containing 30% either fatty acid methyl ester or hydro-treated vegetable oil. Three different late post-injection timings were investigated. Image sequences of the main spray flame as well as the noncombusting late post-injection spray were extracted. In order to verify oil dilution during regeneration cycle and late post-injection, oil samples from six-cylinder test engine were analyzed. According to the present experiments, differences in the spray characteristics are not significant with the tested fuels. However, higher oil dilution rates were observed with fuel blend composed of 30% fatty acid methyl ester. All the studied late post-injection timings were noted to lead to the unwanted cylinder spray/wall interaction and wall-wetting consequently diluting the engine oil. The spray/ wall interaction is thoroughly explained by introducing a theoretical/computational framework which characterizes any spray/wall interaction in terms of a phase diagram for any considered operation conditions. The novelty of this study arises from (1) first comparison of fatty acid methyl ester and hydro-treated vegetable oil blends in an optical engine, (2) strong evidence on the phenomena related to post-injection phase in six-cylinder and single-cylinder optical engine configurations and (3) the development of a single-droplet model showing inevitable wall-wetting.

show abstract

Section: Optical Engine Studiesmentioning

confidence: 84%