3 research outputs found
Experimental investigation and modeling of diesel engine fuel spray
A model for spray penetration in diesel engines is suggested.
It is based on momentum conservation for a realistic
mass flow rate transient profile. The modelling approach is
based on tracking of centre-of-fuel-mass (COFM) of injected
diesel fuel. The model was validated for Bosch and Delphi
injectors using the data obtained at Sir Harry Ricardo automotive
centre, University of Brighton, UK. The model is shown to
produce a good agreement with the experimental data until
major spray instability (such as cluster shedding). It has been
found that the dispersion time (the adjustable model parameter)
is increasing when injection pressure is decreasing. This follows
the known tendency for spray breakup time
ΠΠΎΠ½ΠΎΠΏΠ»ΡΠ½Π΅ Π±ΡΠΎΠΏΠ°Π»ΠΈΠ²ΠΎ Π΄Π»Ρ Π°Π²ΡΠΎΡΡΠ°Π½ΡΠΏΠΎΡΡΡ. Π£ΠΊΡΠ°ΡΠ½ΡΡΠΊΠ° ΠΏΠ΅ΡΡΠΏΠ΅ΠΊΡΠΈΠ²Π°
Ukraine takes a fourth place in the world in the technical hemp production and can use waste ofΒ hemp for biofuel (including biodiesel) production. This paper presents an analysis of cetane numbersand low-temperature properties of hemp biodiesels as well as spray and evaporation of these fuels. TwoΒ types of hemp biodiesel fuels are analyzed: Hemp Methyl esters, produced from hemp oil in Ukraine(HM1) and European Union (HM2). It was found that hemp biodiesel has smaller cetane number thanΒ traditional rapeseed or soy biodiesel. At the same time hemp biodiesel shows better low-temperatureproperties compared with traditional biodiesels. So, it was recommended to use the mixture of rapeseedΒ or soy biodiesel with hemp biodiesel to optimise both the low-temperature properties and cetane numberΒ of fuel. According to modelling the spray parameters of hemp biodiesel are very close to those of soyΒ biodiesel. Evaporation of hemp biodiesel is very close to soy biodiesel according to previous research.Β Therefore, mixture of soy/rapeseed and hemp biodiesels can be recommended for experimentalΒ investigation as a future fuel for Ukrainian market.Π£ΠΊΡΠ°ΡΠ½Π° ΠΏΠΎΡΡΠ΄Π°Ρ ΡΠ΅ΡΠ²Π΅ΡΡΠ΅ ΠΌΡΡΡΠ΅ Π² ΡΠ²ΡΡΡ Ρ Π²ΠΈΡΠΎΡΡΠ²Π°Π½Π½Ρ ΡΠ΅Ρ
Π½ΡΡΠ½ΠΎΡ ΠΊΠΎΠ½ΠΎΠΏΠ»Ρ; Π²ΡΠ΄Ρ
ΠΎΠ΄ΠΈ Π²ΡΠ΄ ΠΏΠ΅ΡΠ΅ΡΠΎΠ±ΠΊΠΈΒ ΠΌΠΎΠΆΠ½Π° Π²ΠΈΠΊΠΎΡΠΈΡΡΠΎΠ²ΡΠ²Π°ΡΠΈ Π΄Π»Ρ Π²ΠΈΡΠΎΠ±Π½ΠΈΡΡΠ²Π° Π±ΡΠΎΠΏΠ°Π»ΠΈΠ²Π° (Π²ΠΊΠ»ΡΡΠ°ΡΡΠΈ Π±ΡΠΎΠ΄ΠΈΠ·Π΅Π»ΡΠ½Π΅ ΠΏΠ°Π»ΠΈΠ²ΠΎ). Π£ ΡΡΠ°ΡΡΡ ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½Π΅ ΠΌΠΎΠ΄Π΅Π»ΡΠ²Π°Π½Π½Ρ ΡΠ΅ΡΠ°Π½ΠΎΠ²ΠΈΡ
ΡΠΈΡΠ΅Π», Π½ΠΈΠ·ΡΠΊΠΎΡΠ΅ΠΌΠΏΠ΅ΡΠ°ΡΡΡΠ½ΠΈΡ
Π²Π»Π°ΡΡΠΈΠ²ΠΎΡΡΠ΅ΠΉ ΡΠ° Π°Π½Π°Π»ΡΠ· ΡΠΎΠ·ΠΏΠΈΠ»Π΅Π½Π½Ρ Π±ΡΠΎΠ΄ΠΈΠ·Π΅Π»ΡΠ½ΠΈΡ
ΠΏΠ°Π»ΠΈΠ² Π½Π° ΠΎΡΠ½ΠΎΠ²Ρ ΠΊΠΎΠ½ΠΎΠΏΠ»Ρ. Π ΠΎΠ·Π³Π»ΡΠ΄Π°Π»ΠΈΡΡ Π΄Π²Π° Π²ΠΈΠ΄ΠΈ Π±ΡΠΎΠ΄ΠΈΠ·Π΅Π»ΡΠ½ΠΎΠ³ΠΎ ΠΏΠ°Π»ΠΈΠ²Π°: ΠΌΠ΅ΡΠΈΠ»ΠΎΠ²Ρ Π΅ΡΡΡΠΈ ΠΊΠΎΠ½ΠΎΠΏΠ»ΡΠ½ΠΎΡ ΠΎΠ»ΡΡ, ΡΠΎ ΠΎΡΡΠΈΠΌΠ°Π½Ρ Π· ΠΊΠΎΠ½ΠΎΠΏΠ»ΡΠ½ΠΎΡ ΠΎΠ»ΡΡ Π² Π£ΠΊΡΠ°ΡΠ½Ρ (HM1) Ρ ΠΠ²ΡΠΎΠΏΠ΅ΠΉΡΡΠΊΠΎΠ³ΠΎ Π‘ΠΎΡΠ·Ρ (HM2). ΠΡΠ»ΠΎ Π²ΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΎ, ΡΠΎ ΠΊΠΎΠ½ΠΎΠΏΠ»ΡΠ½ΠΈΠΉ Π±ΡΠΎΠ΄ΠΈΠ·Π΅Π»Ρ ΠΌΠ°Ρ ΠΌΠ΅Π½ΡΠ΅ ΡΠ΅ΡΠ°Π½ΠΎΠ²Π΅ ΡΠΈΡΠ»ΠΎ, ΠΏΠΎΡΡΠ²Π½ΡΠ½ΠΎ Π· ΡΡΠ°Π΄ΠΈΡΡΠΉΠ½ΠΈΠΌ ΡΡΠΏΠ°ΠΊΠΎΠ²ΠΈΠΌ Π°Π±ΠΎ ΡΠΎΡΠ²ΠΈΠΌ Π±ΡΠΎΠ΄ΠΈΠ·Π΅Π»ΡΠ½ΠΈΠΌ ΠΏΠ°Π»ΠΈΠ²ΠΎΠΌ. Π£ ΡΠΎΠΉ ΠΆΠ΅ ΡΠ°Ρ, ΠΊΠΎΠ½ΠΎΠΏΠ»ΡΠ½Π΅ Π±ΡΠΎΠ΄ΠΈΠ·Π΅Π»ΡΠ½Π΅ ΠΏΠ°Π»ΠΈΠ²ΠΎ ΠΏΠΎΠΊΠ°Π·ΡΡ ΠΊΡΠ°ΡΡ Π½ΠΈΠ·ΡΠΊΠΎΡΠ΅ΠΌΠΏΠ΅ΡΠ°ΡΡΡΠ½Ρ Π²Π»Π°ΡΡΠΈΠ²ΠΎΡΡΡ, ΠΏΠΎΡΡΠ²Π½ΡΠ½ΠΎ Π· ΡΡΠ°Π΄ΠΈΡΡΠΉΠ½ΠΈΠΌΠΈ Π±ΡΠΎΠ΄ΠΈΠ·Π΅Π»Π΅ΠΌ. Π’Π°ΠΊΠΈΠΌ ΡΠΈΠ½ΠΎΠΌ, ΠΌΠΎΠΆΠ½Π° ΡΠ΅ΠΊΠΎΠΌΠ΅Π½Π΄ΡΠ²Π°ΡΠΈ Π²ΠΈΠΊΠΎΡΠΈΡΡΠΎΠ²ΡΠ²Π°ΡΠΈ ΡΡΠΌΡΡ ΡΡΠΏΠ°ΠΊΠΎΠ²ΠΎΠ³ΠΎ/ΡΠΎΡΠ²ΠΎΠ³ΠΎ ΡΠ° ΠΊΠΎΠ½ΠΏΠ»ΡΠ½ΠΎΠ³ΠΎ Π±ΡΠΎΠ΄ΠΈΠ·Π΅Π»ΡΠ½ΠΈΡ
ΠΏΠ°Π»ΠΈΠ² Π΄Π»Ρ ΠΎΠΏΡΠΈΠΌΡΠ·Π°ΡΡΡ Π½ΠΈΠ·ΡΠΊΠΎΡΠ΅ΠΌΠΏΠ΅ΡΠ°ΡΡΡΠ½ΠΈΡ
Π²Π»Π°ΡΡΠΈΠ²ΠΎΡΡΠ΅ΠΉ ΡΠ° ΡΠ΅ΡΠ°Π½ΠΎΠ²ΠΎΠ³ΠΎ ΡΠΈΡΠ»Π° ΠΏΠ°Π»ΠΈΠ²Π°. ΠΠ»Π°ΡΡΠΈΠ²ΠΎΡΡΡ Π΄ΠΎ ΡΠΎΠ·ΠΏΠΈΠ»ΡΠ²Π°Π½Π½Ρ, ΡΠΎ ΠΌΠ°Ρ ΠΊΠΎΠ½ΠΎΠΏΠ»ΡΠ½ΠΈΠΉ Π±ΡΠΎΠ΄ΠΈΠ·Π΅Π»Ρ, Π΄ΡΠΆΠ΅ Π±Π»ΠΈΠ·ΡΠΊΡ Π΄ΠΎ Π²Π»Π°ΡΡΠΈΠ²ΠΎΡΡΠ΅ΠΉ ΡΠΎΡΠ²ΠΎΠ³ΠΎ Π±ΡΠΎΠ΄ΠΈΠ·Π΅Π»ΡΠ½ΠΎΠ³ΠΎ ΠΏΠ°Π»ΠΈΠ²Π°, ΡΠΊ ΠΏΠΎΠΊΠ°Π·ΡΡ ΠΌΠΎΠ΄Π΅Π»ΡΠ²Π°Π½Π½Ρ Π·Π° ΠΎΡΠΈΠ³ΡΠ½Π°Π»ΡΠ½ΠΎΡ ΠΌΠ΅ΡΠΎΠ΄ΠΈΠΊΠΎΡ. ΠΠΈΠΏΠ°ΡΠΎΠ²ΡΠ²Π°Π½Π½Ρ ΠΊΠΎΠ½ΠΎΠΏΠ»ΡΠ½ΠΎΠ³ΠΎ Π±ΡΠΎΠ΄ΠΈΠ·Π΅Π»ΡΠ½ΠΎΠ³ΠΎ ΠΏΠ°Π»ΠΈΠ²Π° ΡΠ°ΠΊΠΎΠΆ Π΄ΡΠΆΠ΅ Π±Π»ΠΈΠ·ΡΠΊΠ΅ Π΄ΠΎ ΡΠΎΡΠ²ΠΎΠ³ΠΎ Π±ΡΠΎΠ΄ΠΈΠ·Π΅Π»ΡΠ½ΠΎΠ³ΠΎ ΠΏΠ°Π»ΠΈΠ²Π°, Π²ΡΠ΄ΠΏΠΎΠ²ΡΠ΄Π½ΠΎ Π΄ΠΎ ΠΏΠΎΠΏΠ΅ΡΠ΅Π΄Π½ΡΡ
Π΄ΠΎΡΠ»ΡΠ΄ΠΆΠ΅Π½Ρ. ΠΡΠΆΠ΅, ΡΡΠΌΡΡ ΡΡΠ°Π΄ΠΈΡΡΠΉΠ½ΠΎΠ³ΠΎ ΡΠΎΡΠ²ΠΎΠ³ΠΎ/ΡΡΠΏΠ°ΠΊΠΎΠ²ΠΎΠ³ΠΎ ΡΠ° ΠΊΠΎΠ½ΠΎΠΏΠ»ΡΠ½ΠΎΠ³ΠΎ Π±ΡΠΎΠ΄ΠΈΠ·Π΅Π»ΡΠ½ΠΈΡ
ΠΏΠ°Π»ΠΈΠ² ΠΌΠΎΠΆΠ΅ Π±ΡΡΠΈ ΡΠ΅ΠΊΠΎΠΌΠ΅Π½Π΄ΠΎΠ²Π°Π½Π° Π΄Π»Ρ Π΅ΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΠΈΡ
Π΄ΠΎΡΠ»ΡΠ΄ΠΆΠ΅Π½Ρ ΡΠΊ ΠΌΠ°ΠΉΠ±ΡΡΠ½ΡΠΎΠ³ΠΎ ΠΏΠ°Π»ΠΈΠ²Π° Π΄Π»Ρ ΡΠΊΡΠ°ΡΠ½ΡΡΠΊΠΎΠ³ΠΎ ΡΠΈΠ½ΠΊΡ
EXPERIMENTAL INVESTIGATION AND MODELLING OF DIESEL ENGINE FUEL SPRAY
A model for spray penetration in diesel engines is suggested. It is based on momentum conservation for a realistic mass flow rate transient profile. The modelling approach is based on tracking of centre-of-fuel-mass (COFM) of injected diesel fuel. The model was validated for Bosch and Delphi injectors using the data obtained at Sir Harry Ricardo automotive centre, University of Brighton, UK. The model is shown to produce a good agreement with the experimental data until major spray instability (such as cluster shedding). It has been found that the dispersion time (the adjustable model parameter) is increasing when injection pressure is decreasing. This follows the known tendency for spray breakup time