On what scientific principle does an aircraft carburetor function?

Question

BlackTom AI · Accepted Answer

Bernoulli’s Principle explains how a change in fluid velocity produces a change in fluid pressure, so an aircraft carburetor uses that principle.

Relevant knowledge points and concepts:
- Bernoulli’s equation: P + ½ρv^2 + ρgh = constant along a streamline. For horizontal flow (neglecting height change), an increase in flow speed v causes a decrease in static pressure P.
- Venturi effect: a constriction (throat) in a flow passage increases velocity and lowers static pressure there.
- Carburetor operation: airflow through the intake is accelerated through a venturi, lowering pressure and drawing fuel from the float chamber through a jet; atomization produces a combustible air–fuel mixture.

Step-by-step reasoning:
1. Air enters the carburetor and is forced through a narrowing venturi. Because the cross-sectional area decreases, continuity (A1v1 = A2v2) requires velocity v to increase in the throat.
2. Applying Bernoulli’s relation: as v increases at the throat, static pressure P decreases (P_throat = P_upstream − ½ρ(v_throat^2 − v_upstream^2)). This lower pressure in the throat is the driving pressure difference.
3. The float chamber is maintained at near-atmospheric pressure. The pressure difference between the float chamber and the low-pressure venturi throat causes fuel to be pushed (via atmospheric pressure) through the jet into the throat.
4. Fuel is atomized by the high-velocity air and mixes with the air stream in the correct proportion for combustion; throttle and jet design control mixture and flow rate.

Why Bernoulli’s Principle is correct:
- The essential mechanism is pressure reduction due to increased velocity in a venturi; that is the core of Bernoulli’s Principle and the venturi effect.

Why the other choices are incorrect:
- Charles’s Law (V ∝ T at constant pressure) concerns gas volume and temperature, not pressure changes caused by flow velocity.
- Boyle’s Law (P ∝ 1/V at constant temperature) relates static pressure and volume for a closed system; it does not describe dynamic pressure drop from increased flow speed in an open venturi.
- Newton’s Third Law (action = −reaction) is a general force principle, not the specific fluid-dynamic cause of fuel draw in a carburetor.

Conclusion: The carburetor operates by the venturi-induced pressure drop predicted by Bernoulli’s Principle; therefore the correct answer is Bernoulli’s Principle. This matches the provided answer: Bernoulli’s Principle.

On what scientific principle does an aircraft carburetor function?单项选择题

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