effective exhaust velocity
Quick Summary
Effective exhaust velocity is a key metric in rocket propulsion engineering. It represents the speed at which exhaust gases are expelled from a rocket engine. A higher effective exhaust velocity means more thrust is generated for a given amount of propellant consumed.1
Rockets achieve thrust by expelling mass at high velocity, a principle described by Newton's third law of motion. The thrust produced is directly proportional to the mass discharge rate and the effective exhaust velocity (ve). While increasing the mass discharge rate uses propellant quickly, increasing ve is a more efficient way to boost thrust.1
For chemical propellants, ve typically ranges from 2,000 to 5,000 meters per second. This value is influenced by how thermal energy from combustion is converted into kinetic energy in the exhaust nozzle. In engineering, effective exhaust velocity is often expressed in seconds, known as specific impulse, by dividing the velocity by the acceleration due to gravity.1
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