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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Impact pressure ： ウィキペディア英語版 Impact pressure In compressible fluid dynamics, impact pressure (dynamic pressure) is the difference between total pressure (also known as pitot pressure or stagnation pressure) and static pressure.〔(DoD and NATO definition of impact pressure ) Retrieved on 2008-10-01〕 〔(The Free Dictionary ) Retrieved on 2008-10-01〕 In aerodynamics notation, this quantity is denoted as $q\_c$ or $Q\_c$. When input to an airspeed indicator, impact pressure is used to provide a calibrated airspeed reading. An air data computer with inputs of pitot and static pressures is able to provide a Mach number and, if static temperature is known, true airspeed. Some authors in the field of compressible flows use the term ''dynamic pressure'' or ''compressible dynamic pressure'' instead of ''impact pressure''.〔Clancy, L.J., ''Aerodynamics'', Section 3.12 and 3.13〕〔"the dynamic pressure is equal to ''half rho vee squared'' only in incompressible flow." Houghton, E.L. and Carpenter, P.W. (1993), ''Aerodynamics for Engineering Students'', Section 2.3.1〕 ==Isentropic flow== In isentropic flow the ratio of total pressure to static pressure is given by:〔 $\backslash frac\; =\; \backslash left(1+\; \backslash frac\; M^2\; \backslash right)^\backslash tfrac$ where: $P\_t$ is total pressure $P$ is static pressure $\backslash gamma\backslash ;$ is the ratio of specific heats $M\backslash ;$ is the freestream Mach number Taking $\backslash gamma\backslash ;$ to be 1.4, and since $\backslash ;P\_t=P+q\_c$ $\backslash ;q\_c\; =\; P\backslash left(M^2\; \backslash right)^\backslash tfrac-1\backslash right)$ Expressing the incompressible dynamic pressure as $\backslash ;\backslash tfrac\backslash gamma\; PM^2$ and expanding by the binomial series gives: $\backslash ;q\_c=q\; \backslash left(1\; +\; \backslash frac\; +\; \backslash frac\; +\; \backslash frac\; ...\; \backslash right)\backslash ;$ where: $\backslash ;q$ is dynamic pressure 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Impact pressure」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.