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rrdelta

Compute relative pressure ratio

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    Syntax

    d = rrdelta(p0,mach,g)

    Description

    example

    d= rrdelta(p0,mach,g)computes the relative pressure ratiodfrom the static pressuresp0, Mach numbers,mach, and specific heat ratios,g.

    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 =1×31.1862 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 =1×31.1862 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 =1×31.1862 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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