1. ME 475/675 Introduction to Combustion Lecture 37

2. Announcements HW16 Ch. 9 (8, 10, 12) Due ? Term Project (3% of grade) Nothing dangerous please! Proposals due Today by 5 PM (part of project grade) Email them to Rachel Green rmgreen@unr.edurmgreen@unr.edu After review we may recommend some changes Indicate on proposal if you want 2% added to HW or Final You may need to resubmit your proposal if you didn’t include this before I will assume it will be added to HW unless you request otherwise Instructions: http://wolfweb.unr.edu/homepage/greiner/teaching/MECH.475.675.Combustion/TermProjectAssignment.pdf 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 emailing rmgreen@unr.edurmgreen@unr.edu

3. Ch. 9 Laminar Diffusion Flames (not premixed)

4. Variables and Boundary Conditions

5. Conservation Equations (radial coordinates, p. 314)

6. Dimensionless Similarity Variable

8. Jet “half” radius Slow Fast

9. Fuel Mass Fraction

10. Example 9.1 A jet of ethylene (C 2 H 4 ) exits a 10-mm-diameter nozzle into still air at 300 K and 1 atm. Compare the spreading angles and axial locations where the jet centerline mass fraction drops to the stoichiometric alue for initial jet velocities of 10 cm/s and 1.0 cm/s. The viscosity of ethylene at 300 k is 102.3x10 -7 Ns/m 2. This is a model for flame length