HOMEAUTOMOTIVE ENGINEERINGINTERNAL COMBUSTION ENGINESPERFORMANCEVolumetric Efficiency Of An Internal Combustion Engine
Volumetric efficiency of an internal combustion engine
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Definition
For a thermal engine, the combustion process depends on the air-fuel ratio inside the cylinder. The more air we can get inside the combustion chamber, the more fuel we can burn, the higher the output engine torque and power.
Since air has mass, it has inertia. Also, the intake manifold, the valves and the throttle are acting as restrictions for the air flow into the cylinders. By volumetric efficiency we measure the capacity of the engine to fill the available geometric volume of the engine with air. It can be seen as a ratio between the volume of air drawn the cylinder (real) and the geometric volume of the cylinder (theoretical).
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Formula
Most of the internal combustion engines used nowadays on road vehicles, have a fixed volumetric capacity (displacement), defined by the geometry of the cylinder and the crank mechanism. Strictly speaking, the total volume of an engine Vt [m3] is calculated function of the total number of cylinders nc [-] and the volume of one cylinder Vcyl [
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HOMEAUTOMOTIVE ENGINEERINGINTERNAL COMBUSTION ENGINESPERFORMANCEVolumetric Efficiency Of An Internal Combustion Engine
Volumetric efficiency of an internal combustion engine
Table of Contents
Definition
Formula
Example
Calculator
Definition
For a thermal engine, the combustion process depends on the air-fuel ratio inside the cylinder. The more air we can get inside the combustion chamber, the more fuel we can burn, the higher the output engine torque and power.
Since air has mass, it has inertia. Also, the intake manifold, the valves and the throttle are acting as restrictions for the air flow into the cylinders. By volumetric efficiency we measure the capacity of the engine to fill the available geometric volume of the engine with air. It can be seen as a ratio between the volume of air drawn the cylinder (real) and the geometric volume of the cylinder (theoretical).
Go back
Formula
Most of the internal combustion engines used nowadays on road vehicles, have a fixed volumetric capacity (displacement), defined by the geometry of the cylinder and the crank mechanism. Strictly speaking, the total volume of an engine Vt [m3] is calculated function of the total number of cylinders nc [-] and the volume of one cylinder Vcyl [
Answer:
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