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Solve the following numerical on four cylinder four stroke engine and calculate diameter of venture and nozzle.

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

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

Aa=π4(D2d2)

=π4(D2(0.4D)2) as d=0.4D

=π4(D20.16D)

=π4×0.84D2=0.66D2

The volume of air supplied …

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