ME 475/675 Introduction to Combustion Lecture 34.

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Presentation transcript:

ME 475/675 Introduction to Combustion Lecture 34

Announcements Integrated BS/MS Degree Term Project Add 2% to HW

Midterm 2 Scaled = 10xSqrt(Raw) Scaled average = 82

Flame Quenching, Mixture Flammability, Ignition

Cold Wall Quenching Quenching distance d Smallest dimension d that allows flame to pass Experimentally determined by shutting off flow of a premixed stabilized flame d tube = (1.2 to 1.5) d tube d d

Simplified Quenching Analysis for a slot b=2 b>2

Quenching will take place when b=2 b>2

Data, Table 8.4 page 291

Example 8.4, page 290 Turn in next time for EC

Flammability Limits

Example 8.5, p 294 (turn in next time for EC) A full propane cylinder from a camp stove leaks its contents of 1.02 lbm (0.464 kg) into a 12’x14’x8’ (4.66 m x 4.27 m x 2.44) room at 20C and 1 atm. After a long time, the fuel gas and room are well mixed. Is the mixture in the room flammable?

Ignition

Energy to bring critical volume to T b