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rrdelta

Compute relative pressure ratio

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    Syntax

    d = rrdelta(p0,mach,g)

    Description

    d = rrdelta(p0,mach,g) computes the relative pressure ratio d from the static pressures p0, Mach numbers, mach, and specific heat ratios, g.

    example

    Examples

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    Open Live Script

    Determine the relative pressure ratio for three pressures.

    delta = rrdelta([101325 22632.0672 4328.1393], 0.5, 1.4)
    delta = 1×3

    1.1862    0.2650    0.0507
    Open Live Script

    Determine the relative pressure ratio for three pressures and three different heat ratios.

    delta = rrdelta([101325 22632.0672 4328.1393], 0.5, [1.4 1.35 1.4])
    delta = 1×3

    1.1862    0.2635    0.0507
    Open Live Script

    Determine the relative pressure ratio for three pressures at three different conditions.

    delta = rrdelta([101325 22632.0672 4328.1393], [0.5 1 2], [1.4 1.35 1.4])
    delta = 1×3

    1.1862    0.4161    0.3342

    Input Arguments

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    Static pressures, specified as a scalar or vector in pascals.

    Example: [1.4 1.35. 1.4]

    Data Types: double

    Mach numbers, specified as a scalar or vector.

    Example: [0.5 1 2]

    Data Types: double

    Specific heat ratios, specified as a scalar or vector.

    Example: [0.5 1 2]

    Data Types: double

    Output Arguments

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    Relative pressure ratio, returned as a scalar or vector.

    Limitations

    For cases in which total pressure ratio is desired, that is, the Mach number is nonzero, the function assumes perfect gas — with constant molecular weight, constant pressure specific heat, and constant specific heat ratio — and dry air when calculating total pressures.

    References

    [1] Pratt & Whitney Aircraft. Aeronautical Vestpocket Handbook. United Technologies, August 1986.

    Version History

    Introduced in R2006b

    See Also

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