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Determine the size of fuel orifice to give A:F=12:1.

Determine the size of fuel orifice to give A:F=12:1. The diameter of venture throat is 3.5 cm and the vacuum at the venture is 6.9 of Hg. The pressure and temperature of atmospheric air are 1.013 bar and 25°C. The nozzle lip=5 mm. Take Cds =0.9, Cdf =0.7, density of fuel 760Kg/m3 .Consider the compressibility of air.

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h = 5 mm

p1 = 1.013 bar

T1 = 25 ° C = 25+273 = 298 K

Cds = 0.9

Cf = 0.7

ρf = 760Kg/m3

Vacuum at the venture is

Pressure after venture,

a = mass flow rate of air

f = mass flow rate of fuel …

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