effective exhaust velocity वाक्य
उदाहरण वाक्य
मोबाइल
- It is defined such that it is related to the effective exhaust velocity by:
- Actual and effective exhaust velocity are the same in rocket engines not utilizing air.
- The effective exhaust velocity in units of m / s is also in reasonably common usage.
- However, the effective exhaust velocity allows for various losses, and notably, is reduced when operated within an atmosphere.
- For air-breathing engines the effective exhaust velocity is not physically meaningful, although it can be used for comparison purposes nevertheless.
- For air-breathing jet engines, particularly turbofans, the actual exhaust velocity and the effective exhaust velocity are different by orders of magnitude.
- This allows a better match between the airspeed and the exhaust speed, which saves energy / propellant and enormously increases the effective exhaust velocity while reducing the actual exhaust velocity.
- In practice the effective exhaust velocities of rockets varies but can be extremely high, ~ 4500 m / s, about 15 times the sea level speed of sound in air.
- The Tsiolkovsky rocket equation shows that for a rocket with a given empty mass and a given amount of fuel, the total change in velocity it can accomplish is proportional to the effective exhaust velocity.
- The values expressed in N�s / kg are not uncommonly seen and are numerically equal to the effective exhaust velocity in m / s ( from Newton's second law and the definition of the newton ).
- Also, sometimes rocket engines have a separate nozzle for the turbo-pump turbine gas, and then calculating the effective exhaust velocity requires averaging the two mass flows as well as accounting for any atmospheric pressure.
- In astrodynamics, which deals with the mechanics of rockets, the term " v " rel is often called the effective exhaust velocity and denoted " v " " e ".
- An example of a specific impulse measured in time is 453 seconds, which is equivalent to an effective exhaust velocity of 4, 440 m / s, for the Space Shuttle Main Engines when operating in a vacuum.
- He determined that a rocket with an effective exhaust velocity ( see specific impulse ) of 7000 feet per second and an initial weight of 602 pounds would be able to send a one-pound payload to an infinite height.
- This is because the effective exhaust velocity calculation essentially assumes that the propellant is providing all the thrust, and hence is not physically meaningful for air-breathing engines; nevertheless, it is useful for comparison with other types of engines.
- The equation relates the delta-v ( the maximum change of velocity of the rocket if no other external forces act ) with the effective exhaust velocity and the initial and final mass of a rocket ( or other reaction engine ).
- The effective exhaust velocity v _ { e } is more or less the speed the exhaust leaves the vehicle, and in the vacuum of space, the effective exhaust velocity is often equal to the actual average exhaust speed along the thrust axis.
- The effective exhaust velocity v _ { e } is more or less the speed the exhaust leaves the vehicle, and in the vacuum of space, the effective exhaust velocity is often equal to the actual average exhaust speed along the thrust axis.
- This alternate form of specific impulse uses the same units as velocity ( e . g . m / s ), and in fact it is equal to the effective exhaust velocity of the engine ( typically designated v _ { e } ).
- :v _ \ text { e } is the specific impulse measured in m / s, which is the same as the effective exhaust velocity measured in m / s ( or ft / s if g is in ft / s 2 ),
- अधिक वाक्य: 1 2
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