A four cylinder four stroke engine has a cubic capacity of 1490 cc. it develops maximum power at 4200 rpm and air fuel ratio is 13:1. The air speed at venture is limited to 90 m/s. the volumetric efficiency of engine is 70%. Nozzle lip is 6 mm and atmospheric pressure and temperature are 1.013 bar and 293 K. An allowance is to be made for emulsion tube whose diameter should be taken as 1 /2.5 of venture diameter. Taking following data, calculate the diameter of venture and nozzle. Cda-0.85,Cdf=0.66 and density of fuel=740Kg/m3

Mumbai University > Mechanical Engineering > Sem 5 > IC Engines

Marks: 10M

Year: Dec 2015

A single carburetor supplies air-fuel mixture to the engine. The area through which air is flowing is

${A_a} = \frac{\pi }{4}({D^2} - {d^2})$

$ = \frac{\pi }{4}({D^2} - {(0.4D)^2})$ as $d=0.4D$

$ = \frac{\pi }{4}({D^2} - 0.16D)$

$ = \frac{\pi }{4} \times 0.84{D^2} = 0.66{D^2}$

The volume of air supplied …