Aerospike nozzles are rather unique, in that they are somewhat of a reverse version of the standard bell nozzle. Instead of using a shroud to contain the exit flow. Abstract- Aerospike nozzles are being considered in the development of the Single Stage to Orbit launching vehicles because of their prominent features and . With a bell nozzle, you have a minor part of rapidly expanding(+cooling) exhaust touching the broad, actively cooled nozzle – that means little.

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This design concept was developed using AeroSpike 2.

They just couldn’t run continuously for as long as a typical rocket needs to lift payload to orbit. A new company, Firefly Aerospacehas replaced the aerospike engine with a conventional engine in the Alpha 2.

propulsion – Why aren’t linear aerospike engines in common use? – Space Exploration Stack Exchange

Note the ablative aerospike nozzle entry-cone that forms the combustion chamber. This design continues to evolve so updated information will appear as results are available.

Define the angle the sonic section of the thruster makes with the axis of the aerospike nozzle. The test flight, which will take place at Spaceport America in the New Mexico desert, will consist of a suborbital space flight that will take the Demonstrator 3 up aerospikke an altitude of km.

After more development and considerable testing, this project was cancelled when the X’s composite fuel tanks repeatedly failed. Then, depending on whether the flow is underexpanded or if the flow is overexpanded AeroSpike performs either a Prandtl-Meyer expansion analysis or an oblique shock wave analysis to determine the angle serospike the outer flow boundary from the lip of the cowl. Rocketdyne conducted a lengthy series of tests in the s on various designs.


The engine has a bell-shaped nozzle that has been cut in half, then stretched to form a ring with the half-nozzle now forming the profile of a plug.

Thruster internal circular radius Ra. Aerospike engines have been studied for a number of years and are nozzel baseline engines for many single-stage-to-orbit SSTO designs and were also a strong contender for the Space Shuttle main engine. You have a lot of extra-hot, very dense gas in contact with the narrow spike that must pass all the coolant and dissipate the heat somehow, not to melt.

The Mach noazle at each point in the flow is determined from the Prandtl-Meyer function using the Newton-Raphson iteration method and the unit processes aerospime by the method of characteristics. The company hoped to develop VentureStar early this century. Width of ramp for linear aerospike nozzles Lramp.

In the Aerospike Nozzle Data section added a display of Distance from end of thruster to end of ramp. However, frequently, a full-length plug nozzle is now called an aerospike. This will never generate significant price drop of space launches, but merely small improvements.

The Aerospike Nozzle – Rocketschnozzles

Despite all of these advantages over the traditional bell nozzle, aerospike nozzles have never actually been used in production designs. Sign up serospike log in Sign up using Google. For the 2-D Minimum Length Nozzle selection the “X” and “Y” coordinates of the nozzle contour represent the horizontal and vertical dimensions that define the 2-D characteristic mesh.

The main data entry area is displayed by default. Figure-9, XRS aerospike rocket engine description data repeated in Figure But do you have some sources or references for further reading? When performing an MLN analysis the only values required are the Inclination angle from the sonic line see aboveDesign Mach number Mdesignand throat diameter Dt. The ratio of specific heats, gas constant Rgasaerosspike pressure Pcand pressure ratio PR are required for the Aerospike Nozzle analysis.


In theory this requires an infinitely long spike for best efficiency, but by blowing a small amount of gas out of the center of a shorter truncated spike like base bleed in an artillery shellsomething similar can be achieved.

Aerospike engine

The purpose of any engine bell is to direct the exhaust of a rocket engine in one direction, generating thrust in the opposite direction. Instead of using a shroud to contain the exit flow, aerospikes direct the flow along the exterior of the nozzle. They have a planned launch in However, due to budget constraints, the Space Shuttle ended up being equipped with bell-shaped nozzles instead, and the Venture Star never saw the light of day. The SSTO idea has lost out to separate autonomous recoverable drone boosters and spacecrafts, which are more mass effective and so cheaper.

Chamber noxzle whose units depend on the units selected.

Chamber temperature in either degrees Rankine or degrees Kelvin depending on the units selected. With traditional bell-shaped nozzles, reliable thrust tends to occur only at sea level. Specify whether the nozzle is 2-D or 3-D by clicking either the 2-D characteristics or 3-D approximation option buttons.

Aetospike of firing the exhaust out of a small hole in the middle of a bell, an aerospike engine avoids this random distribution by firing along the outside edge of a wedge-shaped protrusion, the “spike”, which serves the same function as a traditional engine bell.