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João Carvalho Miguel R. O. Panão António L. N. Moreira

The Thermal Interaction of Pulsed Sprays with Hot Surfaces – application to Port-Fuel Gasoline Injection Systems. João Carvalho Miguel R. O. Panão António L. N. Moreira. IN+, Center for Innovation, Technology and Policy Research Mechanical Engineering Department Instituto Superior Técnico

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João Carvalho Miguel R. O. Panão António L. N. Moreira

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  1. The Thermal Interaction of Pulsed Sprays with Hot Surfaces – application to Port-Fuel Gasoline Injection Systems João Carvalho Miguel R. O. Panão António L. N. Moreira IN+, Center for Innovation, Technology and Policy Research Mechanical Engineering Department Instituto Superior Técnico Av. Rovisco Pais, 1049-001 Lisbon, Portugal

  2. The Thermal Interaction of Pulsed Sprays with Hot Surfaces- application to Port-Fuel Gasoline Injection Systems Spray Cooling in Port-Fuel Injection systems Cryogen Spray Cooling systems example of Port Wain Stain treatment

  3. Concept of Duty Cycle in a pulsed spray Tinj tinj The Thermal Interaction of Pulsed Sprays with Hot Surfaces- application to Port-Fuel Gasoline Injection Systems Fuel Spray injection conditions fuel characteristics surroundingenvironment injector position &orientation impingement secondary breakup Breakup and Vaporization vaporization adherence vaporization vaporization Liquid Film Vapor Droplet adherence secondary atomization air carry Fuel/Air Mixture air carry flow through solid surfaces Panão and Moreira, Experimental Characterization of an Intermittent Gasoline Spray Impinging Under Cross-Flow Conditions, Atomization and Sprays, vol. 15, 201-222, 2005.

  4. The Thermal Interaction of Pulsed Sprays with Hot Surfaces- application to Port-Fuel Gasoline Injection Systems Sample rate = 50kHz GainTC = 300

  5. The Thermal Interaction of Pulsed Sprays with Hot Surfaces- application to Port-Fuel Gasoline Injection Systems r = 0 mm finj = 30 Hz tinj = 5 ms Panão and Moreira, Thermo- and fluid dynamics characterization of spray cooling with pulsed sprays, Experimental Thermal and Fluid Science, in Press.

  6. The Thermal Interaction of Pulsed Sprays with Hot Surfaces- application to Port-Fuel Gasoline Injection Systems • To develop of a simple method to describe the overall thermal interaction, which accounts for the complex non-linear interactions.

  7. The Thermal Interaction of Pulsed Sprays with Hot Surfaces- application to Port-Fuel Gasoline Injection Systems Step 1 – Calculate Ensemble-Average Series Nseries Average over  70 Series ensemble-average series

  8. The Thermal Interaction of Pulsed Sprays with Hot Surfaces- application to Port-Fuel Gasoline Injection Systems Step 2 – Phase-Average Wall Temperature -5% of Tw(t=0) ensemble-average series valid injections (Nvinj)

  9. The Thermal Interaction of Pulsed Sprays with Hot Surfaces- application to Port-Fuel Gasoline Injection Systems Step 3 – Total Average Heat Flux Phase-Average Wall Temperature Transient Profile instantaneous heat flux CALCULATION Reichelt et al., Int. J. Heat Mass Transfer 45 (2002), pp579.

  10. time-average heat flux The Thermal Interaction of Pulsed Sprays with Hot Surfaces- application to Port-Fuel Gasoline Injection Systems Reichelt et al., Int. J. Heat Mass Transfer 45 (2002), pp579. Tw = 125ºC finj = 10Hz

  11. The Thermal Interaction of Pulsed Sprays with Hot Surfaces- application to Port-Fuel Gasoline Injection Systems Step 3 – Total Average Heat Flux Tw = 125ºC finj = 10Hz total average heat flux OVERALL BOILING CURVE

  12. The Thermal Interaction of Pulsed Sprays with Hot Surfaces- application to Port-Fuel Gasoline Injection Systems Step 4 – Spray Cooling Efficiency spray cooling efficiency

  13. The Thermal Interaction of Pulsed Sprays with Hot Surfaces- application to Port-Fuel Gasoline Injection Systems • To develop of a simple method to describe the overall thermal interaction, which accounts for the complex non-linear interactions. • To quantify the effects of injection frequency on the heat removed by the spray.

  14. - 20 20 (mm) The Thermal Interaction of Pulsed Sprays with Hot Surfaces- application to Port-Fuel Gasoline Injection Systems r = 2 mm Sample rate = 50kHz GainTC = 300 Working Conditions Injection frequency = 10, 15, 20 and 30 Hz Duty Cycle = 0.05, 0.075, 0.1 and 0.15 (tinj = 5ms) Wall temperature = 125, 150, 175, 200 and 225ºC

  15. The Thermal Interaction of Pulsed Sprays with Hot Surfaces- application to Port-Fuel Gasoline Injection Systems Overall Boiling Curves

  16. The Thermal Interaction of Pulsed Sprays with Hot Surfaces- application to Port-Fuel Gasoline Injection Systems Spray Cooling Efficiency

  17. The Thermal Interaction of Pulsed Sprays with Hot Surfaces- application to Port-Fuel Gasoline Injection Systems

  18. The Thermal Interaction of Pulsed Sprays with Hot Surfaces- application to Port-Fuel Gasoline Injection Systems

  19. The Thermal Interaction of Pulsed Sprays with Hot Surfaces- application to Port-Fuel Gasoline Injection Systems A novel methodology is developed to quantify the thermal interaction of pulsed sprays with hot surfaces. Total average heat flux increases with injection frequency due to an increase in net mass flux. Nukiyama temperature is independent of injection frequency. Spray cooling efficiency is larger for CHF and lower injection frequencies.

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