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Anonymous asked in 科學工程學 · 9 years ago

原文空氣動力學問答題

1. What are the values of specific heat at constant volume and specific heat at constant pressure in units of SI and English Engineering System for air at standard conditions?2. What are precise speed regimes of aerodynamic flow in term of Mach number?註明

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  • 9 years ago
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    1. - 1.

    The specific heat at constant volume for air at standard conditions:

    Cv,m = 20.7643 J·mol−1·K−1

    Volumetric heat capacity = 0.001297 J·cm−3·K−1

    ------------------------------------

    1. - 2.

    The specific heat at constant pressure for air at standard conditions:

    Cp = 1.0035 J·g−1·K−1

    Cp,m = 29.07 J·mol−1·K−1

    參考資料: "Table of specific heat capacities" at

    http://en.wikipedia.org/wiki/Specific_heat)

    =======================

    2.

    The speed regimes of aerodynamic flow can be

    classified into six categories in term of Mach number:

    Subsonic: the Mach number is less than 1.0

    Transonic: the Mach number is 0.8–1.2

    Sonic: the Mach number is 1.0

    Supersonic: the Mach number is 1.2–5.0

    Hypersonic: the Mach number is 5.0–10.0

    High-hypersonic: the Mach number is larger than 10.0

    參考資料:http://en.wikipedia.org/wiki/Mach_number

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