Reply To: Test Rigs for Exhaust Systems

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Martin Johnson

    I notice the Indian abstract refers to

    a recirculation zone near the primary nozzle exit

    That seems to imply major flow separation, which can only happen with uncontrolled diffusion – an inherently unstable process. When I stopped real work, the state of the CFD art had not cracked un-controlled diffusion. Has it moved on in the last 10 years or so?

    Pulsations – 3 ways round that:
    a storage volume in the steam exhaust – not much space “up front”
    larger blast pipe orifice – may not be feasible to achieve smokebox vaccum.
    Graduated exhaust opening on the valve system – may impose too much exhaust back pressure.
    Take your pick.