A simplified schematic drawing of the carburetor of a gasoline
(S = 0.75) engine is shown in Fig. P5.96. The throat area is 0.5 in.2
.
The running engine draws air downward through the carburetor Venturi
and maintains a throat pressure of 14.3 psia. The low throat pressure
draws fuel from the float chamber and into the airstream. The energy
losses in the 0.07-in.-diameter fuel metering line and valve are given by
where K = 6.0 and V is the fuel velocity in the metering line.
Assume that the air is an ideal fluid having a constant density ρA
= 0.075 lbm/ft3
. The atmospheric pressure is 14.7 psia. Calculate
the air-to-fuel ratio (m˙ a/m˙f).
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