Busemann's Biplane

Busemann's Biplane

Busemann's Biplane is a conceptual airframe design invented by Adolf Busemann which inherently prohibits the formation of N-type shock waves and thus does not create a sonic boom.

It consists of two triangular cross-section plates a certain distance apart, with flat sides top and bottom parallel to the fluid flow. The spacing between the plates is sufficiently large that the flow does not choke and supersonic flow is maintained between them.

Usually with supersonic flow a positive pressure shock wave is generated at the front and a negative pressure shock wave at the rear. With the biplane, the high pressure shock wave created is only on the inside between the two plates and reflects between the two plates so that it cancels/fills in the expansion fan forming at the rear, leaving no external shock waves to propagate to infinity. The flat sides at top and bottom generate no shock waves as the flow is parallel. The lack of external shock waves means that the Busemann Biplane does not suffer from any wave drag.

Although it has been shown to work in wind tunnel testing, and it has been successfully tested for ammunition, nobody has as yet been able to suggest a practical implementation of the concept for aircraft, as it generates no lift.

ee also

*Scramjet

References

External links

* [http://www.ad.mech.tohoku.ac.jp/yamazaki/RESEARCH/busemann/index.html Busemann's Biplane - Explanation and Theory]
* [http://www.ad.mech.tohoku.ac.jp/yamazaki/MOVIE/buse.m1v Animated video of Busemann's Biplane simulation]
* [http://www.dtic.mil/ndia/2004solic/flat.ppt Ammunition using a modified Busemann's biplane for greater range (Powerpoint file)]


Wikimedia Foundation. 2010.

Игры ⚽ Поможем сделать НИР

Look at other dictionaries:

  • biplane — /buy playn /, n. an airplane with two sets of wings, one above and usually slightly forward of the other. [1870 75; BI 1 + (AIR)PLANE] * * * ▪ aircraft  airplane with two wings, one above the other. In the 1890s this configuration was adopted for …   Universalium

  • Adolf Busemann — Adolph Busemann (20 April 1901 3 November 1986) was a German aerospace engineer and influential early pioneer in aerodynamics, specialising in supersonic airflows. He introduced the concept of swept wings, and after immigrating to the United… …   Wikipedia

  • Биплан Бусемана — Для улучшения этой статьи желательно? …   Википедия

  • Биплан Буземана — Биплан Бусемана Биплан Бусемана Busemann s Biplane (Русское произношение фамилии Busemann требует уточнения) конструкторское решение из области авиастроения, которое предотвращает формирование ударной волны N типа,и поэтому не создающее… …   Википедия

  • Wave drag — is an aerodynamics term that refers to a sudden and very powerful form of drag that appears on aircraft and blade tips moving at high subsonic and supersonic speeds. Overview Wave drag is caused by the formation of shock waves around the aircraft …   Wikipedia

  • Sonic boom — The term sonic boom is commonly used to refer to the shocks caused by the supersonic flight of an aircraft. Sonic booms generate enormous amounts of sound energy, sounding much like an explosion. Thunder is a type of natural sonic boom, created… …   Wikipedia

  • Scramjet — Part of a series on Aircraft propulsion Shaft engines (to drive pr …   Wikipedia

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

  • John Carver Meadows Frost — known as Jack (born 1915 in Walton on Thames, England, died 9 October 1979 in Auckland, New Zealand) was a British aircraft designer. His primary contributions centred on pioneering supersonic British experimental aircraft and as the chief… …   Wikipedia

Share the article and excerpts

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