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[[Image:Schlierenfoto Mach 1-2 Pfeilflügel - NASA.jpg|thumb|right|[[Schlieren photography|Schlieren photograph]] of an attached shock on a sharp-nosed supersonic body. The Mach angle is acute, showing that the body exceeds Mach 1.]]
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In [[fluid dynamics]], a '''Mach wave''' is a pressure wave traveling with the [[speed of sound]] caused by a slight change of [[pressure]] added to a [[compressible flow]]. These weak waves can combine in supersonic flow to become a [[shock wave]] if sufficient Mach waves are present at any location. Such a shock wave is called a '''Mach stem''' or '''Mach front'''. Thus it is possible to have shockless compression or expansion in a supersonic flow by having the production of Mach waves sufficiently spaced (''cf.'' isentropic compression in supersonic flows). A Mach wave is the weak limit of an oblique shock wave (a normal shock is the other limit). They propagate across the flow at the '''Mach angle''' ''μ'':<ref>[http://www.grc.nasa.gov/WWW/K-12/airplane/machang.html Mach angle at NASA]</ref>  
 
:<math>\mu = \arcsin\left(\frac{1}{M}\right),</math>
 
where ''M'' is the [[Mach number]].
 
Mach waves can be used in [[Schlieren photography|schlieren]] or shadowgraph observations to determine the local Mach number of the flow. Early observations by [[Ernst Mach]] used grooves in the wall of a duct to produce Mach waves in a duct, which were then photographed by the schlieren method, to obtain data about the flow in nozzles and ducts. Mach angles may also occasionally be visualized out of their condensation in air, as in the jet photograph below.
 
[[Image:FA-18 Hornet breaking sound barrier (7 July 1999) - filtered.jpg|right|thumb|U.S. Navy [[F/A-18 Hornet|F/A-18]] at transonic speed. The white halo is formed by condensed water droplets which are thought to result from an increase in air temperature and pressure behind the shockwave(see [[Prandtl-Glauert Singularity]]). The Mach angle of the weak attached shock made visible by the halo is seen to be close to arcsin (1) = 90 degrees.<ref>[http://antwrp.gsfc.nasa.gov/apod/ap070819.html APOD: 19 August 2007- A Sonic Boom<!-- Bot generated title -->]</ref><ref>http://www.eng.vt.edu/fluids/msc/gallery/conden/mpegf14.htm</ref>]]
 
== See also ==
* [[Gas dynamics]]
* [[Prandtl-Meyer expansion fan]]
* [[Shadowgraph|Shadowgraph technique]]
* [[Schlieren photography]]
* [[Shock wave]]
 
==References==
{{reflist}}
 
==External links==
* [http://www.youtube.com/watch?v=iNBZBChS2YI Supersonic wind tunnel test demonstration (Mach 2.5) with flat plate and wedge creating an oblique shock along with numerous Mach waves(Video)]
 
[[Category:Fluid dynamics]]
[[Category:Waves]]
 
 
{{fluiddynamics-stub}}

Latest revision as of 22:45, 15 December 2014

A lagging computer is truly annoying plus may be very a headache. Almost every individual who utilizes a computer faces this problem certain time or the other. If your computer equally suffers from the same problem, there are it hard to continue functioning as normal. In such a condition, the thought, "what must I do to make my PC run quicker?" is repeated plus infuriating. There's a answer, nonetheless!

Whenever you registry gets cluttered up with a great deal of junk you don't utilize, the PC will run slower. Therefore it really is prudent which you regularly receive a registry cleaned.

The 'registry' is a central database that stores information, settings plus choices for your computer. It's really the most popular reason why XP runs slow and when you fix this issue, you may make your computer run a lot quicker. The problem is the fact that the 'registry' stores a lot of settings plus details regarding your PC... and considering Windows must use so many of these settings, any corrupted or damaged ones may straight affect the speed of your program.

The computer was truly swiftly when we first purchased it. Because the registry was quite clean and free of mistakes. After time, a computer begins to run slow and freezes up now plus then. Because there are errors accumulating inside it plus certain info is rewritten or completely deleted by your wrong uninstall of programs, improper operations, malware or additional factors. That is the reason why your computer performance decreases gradually plus become quite unstable.

The tuneup utilities could come as standard with a back up and restore facility. This ought to be an simple to apply task.That signifies which when you encounter a problem with your PC following utilizing a registry cleaning you are able to merely restore a settings.

Although I constantly employ the many recent variation of browser, often different extensions plus plugins become the cause of mistakes with my browser and the system. The same is the story with my browser which was crashing frequently potentially due to the Flash player error.

Across the top of the scan results display page you see the tabs... Registry, Junk Files, Privacy, Bad Active X, Performance, etc. Every of these tabs can show we the results of that area. The Junk Files are mainly temporary files such as internet information, photos, web pages... And they are merely taking up storage.

Ally Wood is a specialist software reviewer plus has worked in CNET. Then she is functioning for her own review software firm to give feedback to the software creator plus has completed deep test in registry cleaner software. After reviewing the many popular registry cleaner, she has created complete review on a review site for you which could be accessed for free.

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