Drag-resistant aerospike


Drag-resistant aerospike
Trident I first launch on 18 January 1977 at Cape Canaveral. The thin antenna-like structure mounted on the nose cone is the aerospike, which is composed of 2 parts. 1) The Extensible Boom is the long, slender, slightly tapered cylindrical structure; the wider "underside" is mounted to the nose cone. The narrow, top end of the Boom (see full resolution image) is for mounting:2) "flat, circular, metallic" plates (brownish/yellow color, above). New formulas can be tested to see how good the protection from supersonic flight. The plates are mounted perpendicular to the Vertical Axis--much like an upturned Martini glass, the container representing the nosecone, with the stem and base representing the Boom and plate, respectively.

A drag-reducing aerospike is a device used to reduce the forebody pressure drag of blunt bodies at supersonic speeds. The aerospike creates a detached shock ahead of the body. Between the shock and the forebody a zone of recirculating flow occurs which acts like a more streamlined forebody profile, reducing the drag.

This concept was used on the Trident missile and is estimated to have increased the range by 550 km. The Trident aerospike consists of a flat circular plate mounted on an extensible boom which is deployed shortly after the missile breaks through the surface of the water after launch from the submarine. The use of the aerospike allowed a much blunter nose shape, providing increased internal volume for payload and propulsion without increasing the drag. This was required because the Trident I C-4 was fitted with a third propulsion stage to achieve the desired increase in range over the Poseidon C-3 missile it replaced. To fit within the existing submarine launch tubes the third stage motor had to be mounted in the center of the post-boost vehicle with the reentry vehicles arranged around the motor.

Further development of this concept has resulted in the air-spike [1]. This is formed by concentrated energy, either from an electric arc torch or a pulsed laser, projected forwards from the body, which produces a region of low density hot air ahead of the body. This has the advantage over a structural aerospike that the air density is lower than that behind a shock wave providing increased drag reduction.

In 1995 at the 33rd Aerospace Sciences Meeting it was reported that tests were performed at an aerospike-protected missile dome to Mach 6, obtaining quantitative surface pressure and temperature-rise data on the feasibility of using aerospikes on hypersonic missiles.

References

  1. ^ Golovitchev, V.I., Tretjakov, P.K., "Evaluation of Drag Reduction of Blunt Bodies at Supersonic Speeds by Counter-flow Combustion" AIAA 2002-3296, Accessed 3 September 2010

External links



Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Aerospike — may refer to:* Aerospike engine, a rocket engine without a traditional rocket nozzle * Drag resistant aerospike, which helps reduce drag on missiles by creating a detached shock above the missile …   Wikipedia

  • Drag (physics) — Shape and flow Form drag Skin friction 0% 100% 10% 90% …   Wikipedia

  • Nose cone design — Given the problem of the aerodynamic design of the nose cone section of any vehicle or body meant to travel through a compressible fluid medium (such as a rocket or aircraft, missile or bullet), an important problem is the determination of the… …   Wikipedia

  • Aérodynamique de la pointe avant — La conception aérodynamique de la pointe avant de tout véhicule ou d un objet se déplaçant un milieu fluide compressible (comme une fusée ou un avion, un missile ou une balle), est un problème important. Il consiste a déterminer la forme de la… …   Wikipédia en Français

  • Mathematics and Physical Sciences — ▪ 2003 Introduction Mathematics       Mathematics in 2002 was marked by two discoveries in number theory. The first may have practical implications; the second satisfied a 150 year old curiosity.       Computer scientist Manindra Agrawal of the… …   Universalium


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.