Momentum Interaction Amplifier

  • Donald Bain
Part of the International Centre for Mechanical Sciences book series (CISM, volume 45)


The momentum interaction amplifier Fig. 33 (see page 57) is one of the more common types of proportional fluid amplifier using the vector properties of fluid streams. A high energy power jet flows from a nozzle into the interaction region. Low energy control jets are also directed into the interaction region, usually at right angles to the power jet. The walls are removed between the interaction region and the outputs, to prevent the flow from attaching to the sidewalls and making the amplifier bistable. The momentum flux of the power jet and the forces exerted on it by the control jets, determine the direction the fluid will assume after it leaves the interaction region. The control jets will apply pressure forces and / or momentum forces depending on their position. In general, when the control nozzle is close to the side of the power jet pressure forces predominate.


Interaction Region Control Valve Mixture Ratio Outlet Port Momentum Force 
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Copyright information

© Springer-Verlag Wien 1970

Authors and Affiliations

  • Donald Bain
    • 1
  1. 1.British Hydromechanics Research AssociationUK

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