ME 475/675 Introduction to Combustion Lecture 38

Announcements HW16 Ch. 9 (8, 10,12) Due Monday, 12/1/2013 Term Project (3% of grade) Nothing dangerous please! Instructions: Must meet with Rachel to discuss proposal before the end of day Wednesday 26 th Times to meet with Rachel Green about projects Wednesdays, 11-3 pm HREL 306 Fridays, 1-3pmHREL 306 Mondays, 11-4 pm HREL 306 Schedule other times by ing

Last time: Non-reacting, constant-density laminar fuel jet

Now: Burning Fuel Jet (Diffusion Flame)

Soot Soot particles form from incomplete reaction of the HC fuels Forms on the fuel side (inside) of the flame surface and radiate orange and yellow Most soot is consumed as it flows through the hot flame “Wings” form when unburned soot breaks through burning zone Smoke is soot that breaks through Roughly how long will the flame be?

Flame length (a measurable quantity)

Momentum versus Buoyancy controlled flames

Buoyancy effects

Buoyant Length Estimate

Experimentally-Confirmed Numerical Solutions Inverse Gaussian error function “inverf” from Table 9.4

Slot Burners

Example 9.3 page 339 (turn in next time for EC)