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Τι (ποιος) είναι mach number - ορισμός
Mach number
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RATIO OF SPEED OF OBJECT MOVING THROUGH FLUID AND SPEED OF SOUND
Mach (speed); Mach Number; Mach speed; Mach 5 (speed)
Mach number (M or Ma) (; ) is a dimensionless quantity in fluid dynamics representing the ratio of flow velocity past a boundary to the local speed of sound.
Drag-divergence Mach number
The drag-divergence Mach number (not to be confused with critical Mach number) is the Mach number at which the aerodynamic drag on an airfoil or airframe begins to increase rapidly as the Mach number continues to increase. This increase can cause the drag coefficient to rise to more than ten times its low-speed value.
Shock diamond
![Shock diamonds beneath [[Masten Space Systems]] Xoie rocket during the [[Lunar Lander Challenge]] competition-winning landing.](https://commons.wikimedia.org/wiki/Special:FilePath/Kluft-photo-MSS-Xoie-LLC-L2-landing-Img 1282.jpg?width=200 "Shock diamonds beneath [[Masten Space Systems]] Xoie rocket during the [[Lunar Lander Challenge]] competition-winning landing.")
![An [[F-22 Raptor]] with shock diamonds behind it](https://commons.wikimedia.org/wiki/Special:FilePath/Lockheed Martin F-22A Raptor JSOH.jpg?width=200 "An [[F-22 Raptor]] with shock diamonds behind it")
![Shock diamonds behind a [[Lockheed SR-71 Blackbird]].](https://commons.wikimedia.org/wiki/Special:FilePath/SR-71 Blackbird afterburn.jpg?width=200 "Shock diamonds behind a [[Lockheed SR-71 Blackbird]].")
![Aerojet Rocketdyne [[RS-25]] engine test at NASA's Stennis Space Center](https://commons.wikimedia.org/wiki/Special:FilePath/Shuttle Main Engine Test Firing.jpg?width=200 "Aerojet Rocketdyne [[RS-25]] engine test at NASA's Stennis Space Center")
![F-16]] taking off with afterburner](https://commons.wikimedia.org/wiki/Special:FilePath/South Carolina F-16 taking off in Afghanistan.jpg?width=200 "F-16]] taking off with afterburner")
WAVE PATTERN IN SUPERSONIC EXHAUST
Shock diamonds; Mach diamond; Exhaust diamond; Mach disk; Mach Disks; Mach diamonds; Thrust diamond
Shock diamonds (also known as Mach diamonds or thrust diamonds) are a formation of standing wave patterns that appear in the supersonic exhaust plume of an aerospace propulsion system, such as a supersonic jet engine, rocket, ramjet, or scramjet, when it is operated in an atmosphere. The "diamonds" are actually a complex flow field made visible by abrupt changes in local density and pressure as the exhaust passes through a series of standing shock waves and expansion fans.
Παραδείγματα από το σώμα κειμένου για mach number
1. The Mach number is the ratio of an aircraft‘s speed to the speed of sound.