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Modelling of Biodiesel Sprays

Modelling of Biodiesel Sprays. Ruslana Kolodnytska Zhytomyr State Technological University, Ukraine. “We should be using nature's inexhaustible sources of energy. I hope we don't have to wait until oil and coal run out before we tackle that.” (Edison, 1931). Diesel and Biodiesel Spray.

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Modelling of Biodiesel Sprays

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  1. Modelling of Biodiesel Sprays Ruslana Kolodnytska Zhytomyr State Technological University, Ukraine “We should be using nature's inexhaustible sources of energy. I hope we don't have to wait until oil and coal run out before we tackle that.” (Edison, 1931)

  2. Diesel and Biodiesel Spray The initial jet formation at 100 MPA into atmospheric pressure Dual frame at nozzle exit (dt = 400 ns) Diesel fuel Biodiesel Biodiesel The initial jet formation at 40 MPA into atmospheric pressure T.T. Shoba et all ILASS 2011 C. Crua et all, ICLASS 2012.

  3. Diesel Spray Modelling • Sazhin model (2005) • Roizman model (2007) S Stip • Lishevsky model

  4. Diesel Spray Penetration Modelling, СOFM – model (Brighton University) Kolodnytska et all, 2008

  5. Biodiesel content and structure

  6. Modelling of Biodiesel Property Surface tension modelling H - is the space droplet coefficient Rapeseed oil: ZSTU, Ukraine, 2006

  7. Modelling of Property by Using the Structure • Density modelling, (Lapuerta, 2010 ) • Surface tension modelling [P]- parachor (temperature independent parameters) Surface tension of mixture

  8. Shadowgraphic micrographs of biodiesel (RME) sprays 15 mm (0.3 mm off-axis) 10 mm (0.3 mm off-axis) Images recorded at 10 and 15 mm from the orifice at 40 MPA (atmospheric pressure) C. Crua et all, ICLASS 2012.

  9. SMD Diameter for Biodiesel Spray • SMD=0.002103 f+0.00033  ( Allen, 1998, model 1) • SMD= 3.08f0.385(f)0.737g0.06P-0.54Elcotb model • dm = Edd0(g /fWej)– 0.266M0.0733 Lishevskymodel • SMD= 23 d00.35 P-0.54g0.06 l0.1( new model1) • SMD= 0.001l0.29 ( new model 2) • l= f2/(f) - new length parameter

  10. SMD Dimeters of Diferent Biodiesel (methyl ester of vegetable oils) Kolodnytska, 2006

  11. Fuel Eggers Parameters New parameters Length Time f – fuel density , – fuel surface tension,  f – fuel dynamic viscosity l= f2/(f) t= f /(2f )

  12. Droplet size distributions for biodiesel and diesel sprays (a) 10 mm from nozzle exit at 100 MPa (b) 15 mm from nozzle exit at 100 MPa C. Crua et all, ICLASS 2012

  13. Vaporization history of biodiesel and diesel drops a) biodiesel drops at different ambient temperatures and 1 bar ambient pressure b) diesel–biodiesel blends at 912 K ambient temperature and 1 bar ambient pressure L. Zhang, S.-C. Kong (2010). Combustion and Flame

  14. Vapour distributions of diesel fuel and biodiesel sprays Biodiesel blend B20 (20% biod.) Diesel Biodiesel vapour vapour Biodiesel fuel vapour Diesel fuel vapour (t=1.4 ms, Tamb=900 K, Pamb=37.58 bar) Zhang Lei, http://lib.dr.iastate.edu/etd/10268

  15. Conclusions 1. In order to apply spray model to biodiesel it is necessary to use model’s parameters based on fuel property. It seems promising to develop a hybrid model based on the Wave breakup model and COFM model. 2. The new formula for SMD diameter based on fuel property has been proposed. Biodiesel property has been modelled by using biodiesel structure and liquid bridge experiments. 3. The biodisel droplets has a longer heating time than the diesel droplets due to its low volatility.

  16. Future research • To apply a quasi-discrete model for biodiesel droplet avaporation Antoine equation: Pitzer equation: isreduced temperature isacentric factor isreduced temperature at normal boiling temperature

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