ME 475/675 Introduction to Combustion Lecture 39.

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ME 475/675 Introduction to Combustion Lecture 39

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 Today If you chose not to perform project you will forfeit 3% of your grade Please inform us if that is your choice 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

Burning Fuel Jet (Diffusion Flame)

Flame length (a measurable quantity)

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

Slot Burners

Geometry and Flow Rate Dependence

Fuel Dependence

Stoichiometric Factors

Primary Aeration (of nozzle) Ambient

Fuel Dilution Ambient

Example 9.4 Design a natural-gas burner for a commercial cooking range that has a number of circular ports arranged in a circle. The circle diameter is constrained to be 160 mm (6.3 inch). The burner must deliver 2.2 kW at full load and operate with 40 percent primary aeration. For stable operation, the loading of than individual port should not exceed 10 W per mm 2 of port area. (see Fig for typical design constraints for natural-gas burners.) Also, the full-load flame height should not exceed 20 mm. Determine the number and the diameter of the ports.

Fuel Dependence

Stoichiometric Factors