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# Topic: Mach number

###### In the News (Wed 17 Jul 19)

 Mach number - Wikipedia, the free encyclopedia The Mach number is commonly used both with objects travelling at high speed in a fluid, and with high-speed fluid flows inside channels such as nozzles, diffusers or wind tunnels. At a temperature of 15 degrees Celsius, Mach 1 is 1,225 km·h The mach number is not a constant; it is temperature dependent. en.wikipedia.org /wiki/Mach_number   (892 words)

 Ernst Mach - Wikipedia, the free encyclopedia Ernst Mach (February 18, 1838 – February 19, 1916) was an Austrian-Czech physicist and philosopher and is the namesake for the "Mach number" (aka Mach speed) and the optical illusion known as Mach bands. Mach returned to the University of Vienna as professor of inductive philosophy in 1895, but he suffered a stroke two years later and retired from active research in 1901, when he was appointed to the Austrian parliament. Mach's paper on this subject was published in 1877 and correctly describes the sound effects observed during the supersonic motion of a projectile. en.wikipedia.org /wiki/Ernst_Mach   (768 words)

 Mach Number As the speed of the object approaches the speed of sound, the flight Mach number is nearly equal to one, M = 1, and the flow is said to be transonic. The trigonometric sine of the cone angle b is equal to the inverse of the Mach number M and the angle is therefore called the Mach angle. The Mach number depends on the speed of sound in the gas and the speed of sound depends on the type of gas and the temperature of the gas. www.grc.nasa.gov /WWW/K-12/airplane/mach.html   (826 words)

 NASAexplores 9-12 Lesson: Mach Number (Student Sheets)   (Site not responding. Last check: 2007-10-21) In aerodynamics, the Mach number is the ratio of the speed of the object to the speed of sound. Mach 1 means that you are traveling at the speed of sound or 661.7 knots. As the speed of the object approaches the speed of sound, the Mach number is nearly equal to one, and the flow is said to be transonic. www.nasaexplores.com /show_912_student_st.php?id=03010381611   (616 words)

 Aerospaceweb.org | Ask Us - Speed of Sound, Mach Number & Sound Barrier The Mach number (M) is simply the ratio of the vehicle's velocity (V) divided by the speed of sound at that altitude (a). For example, an aircraft flying at Mach 0.8 is traveling at 80% of the speed of sound while a missile cruising at Mach 3 is traveling at three times the speed of sound. Therefore, if you know the value of Mach 1 in miles per hour, feet per second, kilometers per hour, or any other unit of measurement at the altitude in question, you merely have to multiply that value by the desired Mach number to determine the speed in that particular unit. www.aerospaceweb.org /question/atmosphere/q0126.shtml   (1583 words)

 Mach number   (Site not responding. Last check: 2007-10-21) If an object travels through some medium, then its Mach number is the ratio of the object's speed to the speed of sound in that medium. It is a dimensionless number, typically used to describe the speed of fast aircraft. Mach 1 is equal to the speed of sound, Mach 2 is twice that speed, etc. Since the speed of sound increases as the temperature increases, the actual speed of an aircraft traveling at Mach 1 will depend on its altitude and the atmospheric conditions. usapedia.com /m/mach-number.html   (147 words)

 HighBeam Encyclopedia - Mach number   (Site not responding. Last check: 2007-10-21) MACH NUMBER [Mach number] [for E. Mach ], ratio between the speed of an object and the speed of sound in the medium in which the object is traveling. An airplane that has the velocity of Mach 3.0 is traveling at three times the speed of sound as measured in the prevailing atmospheric conditions. The Scientist as Spectator: Musil's Torle[Beta] and the Challenge to Mach's Neo-Positivism. www.encyclopedia.com /html/M/Machnumb.asp   (222 words)

 Mach number   (Site not responding. Last check: 2007-10-21) Named for Ernst Mach, an Austrian physicist, the figure represents the ratio of the speed of an object to the speed of sound in the surrounding medium, such as air, through which the object is moving. A body traveling at Mach 1 would be traveling at the speed of sound. Mach 2 would equal twice the speed of sound. www.stthomas.edu /jour/apstyle/Mach_number.html   (88 words)

 Physical Explaination for Nonmonotone Mach Number Variation   (Site not responding. Last check: 2007-10-21) The oscillatory behavior of the Mach number is due to the nonclassical behavior of the thermodynamic sound speed observed when the fundamental derivative is less than one. Afterall, the Mach number M = v/a is the ratio of the flow speed (v) to the sound speed (a). Thus, it is clear that our "intuition" that the Mach number always decreases with increasing pressure is based on the assumption that the sound speed increases with increasing pressure. www.fluidmech.net /msc/vita/summary/phys_is.htm   (278 words)

 Mach Number - Search Results - MSN Encarta Mach Number, in aerodynamics and fluid mechanics, the ratio of the speed of an object, usually an aircraft, through a fluid (gas or liquid) to the... Mach, Ernst (1838-1916), Austrian physicist and philosopher, born in Turany (now in the Czech Republic) and educated at the University of Vienna. The average position of the magnetopause, and therefore the size of the magnetosphere, can be calculated from the properties of the solar wind. uk.encarta.msn.com /Mach_Number.html   (120 words)

 Aerospaceweb.org | Ask Us - Mach vs. Altitude Tables Mach number (M) is a ratio comparing the velocity of a vehicle (V) against the speed of sound (a): Mach 5(SL) = 5 * (761.2 mph) = 3806 mph Mach 5(SL) = 5 * (661 kts) = 3305 kts www.aerospaceweb.org /question/atmosphere/q0112.shtml   (754 words)

 Mach Number - Activity The Mach number is ratio of the speed of the aircraft to the speed of sound. An airplane flying at less than Mach 1 is traveling at subsonic speeds; at about Mach 1, or transonic, it is at the speed of sound, and greater than Mach 1 is supersonic. Use the definition of Mach number obtained from the Mach Number slide and the information above to determine the speed of a jet at Mach 3. www.grc.nasa.gov /WWW/K-12/BGA/Corrine/mach_number_act.htm   (273 words)

 Mach number   (Site not responding. Last check: 2007-10-21) A unit of speed used to indicate the speed of aircraft, and of spacecraft within the atmosphere. Mach 1 is traveling at the speed of sound; Mach 2, twice the speed of sound, and so on. The British-French Concorde airliner did reach supersonic speeds on its transoceanic flights, and had a Mach meter on the forward bulkhead of its passenger cabin. www.sizes.com /units/mach_number.htm   (100 words)

 Cactus2000 : Speed of sound and Mach number The Mach number is defined as the ratio of the speed of an object (e.g. After the calculation of the speed of sound you may calculate the Mach number of a flying object or its speed, if the Mach number is known. Type the value of the speed of the object or its Mach number into the field behind which you find the correct unit. www.cactus2000.de /uk/unit/massmac.shtml   (527 words)

 Mach number - Engineering Mach Number is defined as the ratio of speed to the speed of sound in the medium in study. Since the speed of sound increases with the increase of temperature, the actual speed of an object travelling on Mach 1 will depend primarily on the fluid temperature around it. The other values upon which the exact mach number depends are: the gas constant of the fluid (R), and the adiabatic index of the gas( engineering.wikia.com /wiki/Mach_number   (166 words)

 Mach number In the Earth's atmosphere, Mach 1 is reached when a body (such as an aircraft or spacecraft) ‘passes the sound barrier’, at a velocity of 331 m/1,087 ft per second (1,192 kph/740 mph) at sea level. A space shuttle reaches Mach 15 (about 17,700 kph/11,000 mph an hour) 6.5 minutes after launch. The Mach number is named after Austrian physicist Ernst Mach. www.tiscali.co.uk /reference/encyclopaedia/hutchinson/m0017573.html   (229 words)

 Critical Mach Number This effect is shown in the diagram to the left. The aircraft Mach number at which the airflow first reaches the speed of sound is called the Critical Mach number. The normal shock waves are the main source of increased drag during Transonic flight. selair.selkirk.bc.ca /aerodynamics1/High-Speed/Page2b.html   (165 words)

 Mach Number The Mach Number is a dimensionless value useful for analyzing fluid flow dynamics problems where compressibility is a significant factor. The square of the Mach number is the Cauchy Number. If the mach number is ~ 1, the flow velocity is approximately like the speed of sound - and the speed is transonic. www.engineeringtoolbox.com /mach-number-d_581.html   (452 words)

 Temperature and Mach number - PPRuNe Forums My question is this: I have read somewhere (I think, I'm starting to think I was dreaming, because of course I can't find it again) that temperature changes do not affect Mach number, as temperature affects both TAS and the local speed of sound in the same manner. Rough numbers are 760 mph at sea level for a temp of 15 C and 660 mph at the tropopause for a temp Thus, at higher speeds and altitudes, compressibility MUST be considered (the ‘f’ factor), and compressibility relates directly to Mach Number. www.pprune.org /forums/showthread.php?t=204260   (2593 words)

 Low Mach Number Simulations of Nuclear Flames This approach, based on low Mach number asymptotics, uses a projection formulation coupled with higher-order Godunov advective differencing that allows time-steps based on advection speeds rather than acoustic speeds. For problems in combustion, governed by an ideal gas equation of state, the low Mach number approach has seen substantial development and has been successfully applied to simulation of laminar and turbulent flames in two and three dimensions. In particular, we discuss the extension of the low Mach number methodology to degenerate equations of state typical of stellar environments. seesar.lbl.gov /ccse/Research/SNae   (915 words)

 Citebase - Low Mach number flows, and combustion We prove uniform existence results for the full Navier-Stokes equations for time intervals which are independent of the Mach number, the Reynolds number and the Péclet number. Citation coverage and analysis is incomplete and hit coverage and analysis is both incomplete and noisy. Low Mach number limit of viscous polytropic flows:formal asymptotics in the periodic case. citebase.eprints.org /cgi-bin/citations?id=oai:arXiv.org:math/0511145   (506 words)

 Energy Citations Database (ECD) - Energy and Energy-Related Bibliographic Citations The optimum duct design in a magnetohydrodynamic generator is shown to be close to the one in which the flow Mach number remains constant. This constant-Machnumber generator is analyzed in some detail, and it is shown that the optimum Mach number can be defined to within a few percent. Curves are presented which enable the optimum Mach number to be determined with greater precision when the optimum load conditions have been selected. www.osti.gov /energycitations/product.biblio.jsp?osti_id=4729151   (260 words)

 AllRefer.com - Mach number (Aviation, General) - Encyclopedia You are here : AllRefer.com > Reference > Encyclopedia > Aviation, General > Mach number Mach number[mAk] Pronunciation Key, ratio between the speed of an object and the speed of sound in the medium in which the object is traveling. More articles from AllRefer Reference on Mach number reference.allrefer.com /encyclopedia/M/Machnumb.html   (160 words)

 Mach number - Multiple spatial scales in engineering and atmospheric low Mach This has promoted the development of so-called low mach number methods, which allow for a filtering of the sound waves. Figure 1: Minimum Mach number required to melt a single 1 mm As the shock Mach number greatly exceeds the critical Mach number, a series of large-amplitude, coherent electrostatic waves with the electron holes in sitessurf.com /stsu/mach-number.html   (194 words)

 MACH NUMBER - Military Periscope   (Site not responding. Last check: 2007-10-21) The Mach number is the ratio of the velocity of a body to that of sound in the surrounding medium at sea level. The speed of sound--Mach 1--in air at sea level (standard temperature and pressure) is 661 kts (761 mph; 1,225 km/h); the speed of sound decreases as the altitude increases. Redistribution of content is prohibited without prior consent of Military Periscope. www.periscope.ucg.com /terms/t0000173.html   (63 words)

 Zero Mach number lift coefficient Question is: What is the corresponding zero Mach number lift coefficient My first two questions were to find freestream Mach number and wing lift coefficient if that helps any. I believe the zero Mach number has to do with stagnation conditions at the T, P and density values, or whatever physical parameters go into the lift equation. www.physicsforums.com /showthread.php?p=925941#post925941   (254 words)

 Mach number   (Site not responding. Last check: 2007-10-21) Ernst Mach - Mach, Ernst, 1838–1916, Austrian physicist and philosopher, b. Related content from HighBeam Research on: Mach number MACH names Martin Lippert as Chief Executive Officer. www.infoplease.com /ce6/sci/A0830938.html   (143 words)

 Mach Number   (Site not responding. Last check: 2007-10-21) Mach number is used in momentum transfer in general and near/ultra sonic flow and throttling calculations in particular. It is normally defined in the following form : Use of this site indicates you accept the Terms of Use www.processassociates.com /process/dimen/dn_mac.htm   (38 words)

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