Question

A carburettor makes use of a restriction (throat diameter Ø35mm) to produce low pressure around the holes in the fuel nozzle to draw fuel into the air stream passing through the throat. The butterfly valve controls the air–fuel mixture intake into the engine. If the engine is taking 14L/s of air/fuel mixture (ρ_mix = 1.3kg/m³) into the manifold,

a. calculate the pressure (Pa) at the fuel nozzle.

b. If the fuel’s density is 820kg/m³ what is the maximum height (H) that the fuel can be lifted into the airstream.

Fuel drawn into throat Atmosphere AirT athrough nozzle Throat 150mm ^ due to low air pressure Butterfly ← Float valve 35 mm dia chamberFuel (b) Fuel jet (orifice)

Answer 1

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