6. A 4-cylinder, 4-stroke SI engine, having a bore of 10 cm and stroke 9 cm runs at 4000 rpm. The fuel used has a Carbon

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6 A 4 Cylinder 4 Stroke Si Engine Having A Bore Of 10 Cm And Stroke 9 Cm Runs At 4000 Rpm The Fuel Used Has A Carbon 1 (24.96 KiB) Viewed 34 times

6. A 4-cylinder, 4-stroke SI engine, having a bore of 10 cm and stroke 9 cm runs at 4000 rpm. The fuel used has a Carbon content of 84.5% and a Hydrogen content of 15.5% by weight. The volumetric efficiency of the engine at 75% of full throttle and at 4000 rpm is 0.85 corresponding to 300 K and 1 bar. The engine is to be supplied with a mixture of air coefficient 0.95 when 75% of full throttle. Calculate the throat diameter of the venturi if the air velocity is not to exceed 200 m/s under the above operating conditions. Also calculate the rate of fuel flow in kg/s and the pressure drop at the venturi throat. Discharge coefficient for the venture is 0.8 and the area ratio of the venturi is also 0.8. Consider for air equal to 0.287 kJ/kg.K and for fuel vapor is 0.09 kJ/kg.K