Mach number

also mach number (mäk)

n. Abbr. M

The ratio of the speed of an object to the speed of sound in the surrounding medium. For example, an aircraft moving twice as fast as the speed of sound is said to be traveling at Mach 2.

[After Ernst Mach.]

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Mach number

(Units) (often not capital) the ratio of the speed of a body in a particular medium to the speed of sound in that medium. Mach number 1 corresponds to the speed of sound. Often shortened to: Mach

[C19: named after Ernst Mach]

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

mach

or Mach

(mɑk)

n.

a number indicating the ratio of the speed of an object to the speed of sound in the medium through which the object is moving. Abbr.: M

[after E. Mach]

Mach

(mɑk, mɑx)

n.

Ernst, 1838–1916, Austrian physicist.

mach.

1. machine.

2. machinery.

3. machinist.

Mach number

(mäk)

The ratio of the speed of a body to the speed of sound in a particular medium. For example, an aircraft flying through air at twice the speed of sound has a Mach number of 2.

The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

mach number

The ratio of the velocity of a body to that of sound in the surrounding medium.

Dictionary of Military and Associated Terms. US Department of Defense 2005.

mach number

A unit of velocity. Mach 1 is the speed of sound; Mach 5 is described as hypersonic.

ThesaurusAntonymsRelated WordsSynonymsLegend:

Noun

Mach number - the ratio of the speed of a moving body to the speed of sound

ratio - the relative magnitudes of two quantities (usually expressed as a quotient)

Translations

Machovo číslo

Mentioned in

References in periodicals archive

It explains inviscid hypersonic flows, emphasizing the fluid-dynamic effects of the Mach number becoming large; viscous hypersonic flows, emphasizing the purely fluid-dynamic effects of including the transport phenomena of the viscosity and thermal conduction at the same time that the Mach number becomes large; and the influence of high temperatures on both inviscid and viscous flows.

Hypersonic and High-Temperature Gas Dynamics, 3rd Edition

Free-stream Mach number was taken as 0.75 for all computational runs while sideslip and angle of attack values vary between 0 and 5.

Effects of Curvature and Area Distribution on S-Shaped Subsonic Diffuser Performance

In general, as the Mach number increases, the compression of gas by shock wave enhances, and more violent chemical reactions occur which strengthen the plasma around the vehicle.

Backward Scattering Characteristics of a Reentry Vehicle Enveloped by a Hypersonic Flow Field

However, it is still time-consuming for any high-fidelity CFD techniques to simulate the unsteady aerodynamic loads due to the broad variation of parameters, such as different combinations of mean angle of attack and Mach number. For example, the linear doublet-lattice method has been frequently used for the aeroelastic analysis of aircraft although CFD techniques offer more accurate numerical simulations.

Efficient Training Data Generation for Reduced-Order Modeling in a Transonic Flight Regime

Aviation Partners, known worldwide for its Blended and Split Scimitar Winglets TM, on Business Jets and Commercial Aircraft used highly sophisticated computational fluid dynamics (CFD) methods to redesign the P51's wing surface airfoils and to reduce and eliminate the strong shock waves created at Mach number 0.75 and 0.80.

Absolute World Speed Record for Piston Engine Propeller Driven Airplane Set

In the dimensionless computations, the flow speed, [v.sub.0], will be presented by the Alfven Mach number [M.sub.A] = [v.sub.0]/[v.sub.Ai].

Modeling Kelvin-Helmholtz Instability in Soft X-Ray Solar Jets

The static pressure rise is achieved through the ramming effect of the air; the increase in Mach number results in increase in static pressure and static temperature with the loss of stagnation pressure due to the presence of shock waves.

Design and investigation of hypersonic scramjet inlet for mach number of 10 and its performance at various flight regimes