Question

When an engine is idling, it requires lean fuel air mixture. (a) True (b) False.

   When an engine is idling, it requires lean fuel air mixture.
(a) True
(b) False.

Mechanical Engineering

Mechanical Engineering

Dr. R.K. Bansal 7th Edition

Chapter 4, Problem 257

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A fuel-air mixture is the combination of fuel and air that is used for combustion in an engine. Show more…

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When an engine is idling, it requires lean fuel air mixture. (a) True (b) False.

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Key Concepts

Engine Idle Operation

Engine idle operation refers to the state in which an engine runs at a low speed with minimal load. At idle, the engine must maintain smooth operation and stability while consuming less fuel. The fuel-air mixture during idling is carefully adjusted to ensure reliable and efficient combustion at these low speeds, which typically involves a richer mixture than one might expect for lean burn conditions to maintain thermal stability and prevent misfires.

Combustion Stoichiometry

Combustion stoichiometry involves balancing the fuel and air in a combustion process to achieve complete combustion without excess fuel or oxygen. In engine design, maintaining a near-stoichiometric mixture is important for optimal performance and emissions control. However, operational demands such as idling often require adjustments to this balance to ensure stable combustion under varying loads and engine speeds.

Fuel-Air Mixture Ratio

The fuel-air mixture ratio is a critical parameter in internal combustion engines, specifying the relative amounts of fuel and air that enter the combustion chamber. This ratio directly affects the combustion efficiency, engine performance, and emissions. Deviations from the ideal (stoichiometric) mixture can lead to incomplete combustion, engine knock, or inefficient power generation, making its proper control vital in various engine operating conditions.

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