Question

Problem 3.57

An automobile is cruising along a level highway steadily at 62 miles/hr. the on-board computer indicates a fuel economy of 26 miles/gal. the engine is operating at an air-fuel ratio of 14.7 (mass basis). the density of the fuel is 860 kg/m^3. assuming the exhaust gases have a molecular weight of 28.5 kg/kmol and a temperature of 580 K, determine their velocity in the 50-mm-diameter exhaust pipe. the exhaust pressure is nominally 100 kPa. Also estimate the change in weight of the automobile and its contents in the time it takes to tracel 100 miles.

Answer 1

Toe 365is Se c fuel Ceunption by car in mils por cubic m rmule moten is gaf mっ 6368.5 2-507se d L dt tr Sub stitut e 36oty/m, d dヒ time tatan loo milas brip 100 miles 믐 speed, of Can o 0172 2 -5 806.5오 c

2 65865 12.519 て112.3N r147xo At 0.031740 .002 t G Penhauyt eerhaie g.su 586 196x1 r

o.038 8G orhaust