IIT JEE , AIEEE Forum - Physics , Mechanics

chem.master

PLZ EXPLAIN ROCKET PROPULTION!

shaiwal

Welcome to the Beginner's Guide to Propulsion
image of jet engine
What is propulsion? The word is derived from two Latin words: pro meaning before or forwards and pellere meaning to drive. Propulsion means to push forward or drive an object forward. A propulsion system is a machine that produces thrust to push an object forward. On airplanes, thrust is usually generated through some application of Newton's third law of action and reaction. A gas, or working fluid, is accelerated by the engine, and the reaction to this acceleration produces a force on the engine.

A general derivation of the thrust equation shows that the amount of thrust generated depends on the mass flow through the engine and the exit velocity of the gas. Different propulsion systems generate thrust in slightly different ways. We will discuss four principal propulsion systems: the propeller, the turbine (or jet) engine, the ramjet, and the rocket.

Why are there different types of engines? If we think about Newton's first law of motion, we realize that an airplane propulsion system must serve two purposes. First, the thrust from the propulsion system must balance the drag of the airplane when the airplane is cruising. And second, the thrust from the propulsion system must exceed the drag of the airplane for the airplane to accelerate. In fact, the greater the difference between the thrust and the drag, called the excess thrust, the faster the airplane will accelerate.

Some aircraft, like airliners and cargo planes, spend most of their life in a cruise condition. For these airplanes, excess thrust is not as important as high engine efficiency and low fuel usage. Since thrust depends on both the amount of gas moved and the velocity, we can generate high thrust by accelerating a large mass of gas by a small amount, or by accelerating a small mass of gas by a large amount. Because of the aerodynamic efficiency of propellers and fans, it is more fuel efficient to accelerate a large mass by a small amount. That is why we find high bypass fans and turboprops on cargo planes and airliners.

Some aircraft, like fighter planes or experimental high speed aircraft, require very high excess thrust to accelerate quickly and to overcome the high drag associated with high speeds. For these airplanes, engine efficiency is not as important as very high thrust. Modern military aircraft typically employ afterburners on a low bypass turbofan core. Future hypersonic aircraft will employ some type of ramjet or rocket propulsion.

The site was prepared at NASA Glenn by the Learning Technologies Project (LTP) to provide background information on basic propulsion for secondary math and science teachers. The pages were originally prepared as teaching aids to support EngineSim, an interactive educational computer program that allows students to design and test jet engines on a personal computer. Other slides were prepared to support LTP videoconferencing workshops (http://www.grc.nasa.gov/WWW/K-12/CoE/Coemain.html) for teachers and students. And other slides were prepared as part of Power Point Presentations for the Digital Learning Network.

There is a special section of the Beginner's Guide which deals with compressible, or high speed, aerodynamics. This section is intended for undergraduates who are studying shock waves or isentropic flows and contains several calculators and simulators for that flow regime. for further see http://www.grc.nasa.gov/WWW/K-12/airplane/bgp.html

kundan_leo

arre yaaar..
poor guy must have got scared with the explanation..

its simple yaaar...
it works on a fuel having a very high capacity calorific value...
its called an intsifier...

the fuel once ignited.....produces a lot of combustion yield...which in turn produces enough thrust on the ground to propel the rocket in the air...

NEWTON'S 3RD LAW..YAAR.....- equal and opposite reaction....allrit....

and then once its got peripheral rockets to provide it the escape velocity...and then those drop out after putting the rocket in the orbit....

or further enhanced rear engines...carry it to the desired location.....
i hope its clear now...
take care...cheers

Protyush_Sahu

Propulsion is a phenomenon which works on Newton's third law

When a fuel is burnt

it applies force in a particular direction,

and applying Newton's 3rd law the rocket moves in the opposite direction

edison

http://en.wikipedia.org/wiki/Spacecraft_propulsion

Ask & Discuss Questions with Community & Experts