Sunday, June 2, 2019

The Aerospike :: physics aerospike rocket engine

When a come ups fuel ignites, the molecules in the fuel release a tremendous amount of energy in the forms of heat, light, and sound. They expand rapidly as they move from the throat of the nozzle into the bell. The compressed air inside the b eitheroon wants to expand outward. Therefore it presses against the walls of the balloon in either direction except the place where there is no wall - the nozzle of the balloon. Because there is no cast vector in this location, adding the vectors yields a net force to the right.A bell nozzle, where a fuel (liquid Hydrogen) mixes with an oxidizer (liquid Oxygen) at a rate m. As they ignite they are forced into the throat, where they are compressed substantially. As they move out into the bell, they steadily expand, button against the nozzle and creating a net upward thrust, similar to the compressed air pushing on the walls of the balloon. Luckily, a rocket can be controlled more than a released balloon.Nozzles do not have to be bell shaped - as long as gas is expanding and pushing against a surface, creating thrust, any shape can be used One alternative to the bell engine is the spike configuration. In particular, the Aerospike engine will be described and analyzed.The Spike, or annular, engine is one of three basic engine designs cones, bells, and annulars.The Cone is the simplest engine design. A cone with a narrow angle provides the superior thrust, but a longer engine means increased weight. A short, wide-angle cone tends to be unstable under pressure (in the atmosphere). For example, the Apollo Saturn 5 feature long, relatively thin nozzles for optimum thrust at sea level. The Command Module, which operated only in space, utilized a comparatively wider engine for more enlargement in space. The Bell nozzle is a compromise, opening up more rapidly snuggle the throat and then opening more slowly near the end. However, bell nozzles are optimized for specific altitudes, therefore they will only provide their maxi mum thrust at a given altitude - at all other points they will provide less-than-optimum thrust.The annular, or altitude compensating engine is a more recently developed design. Commonly referred to as Spike engines, annulars operate with tucker flow outside what is typically thought of as the nozzle. The exhaust flows around a central spike, rather than being contained by walls. They are called annular because the throat is donut-shaped, with the spike protruding from the middle.

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