The Use of Jet Injection to Produce Uniform Velocity in a High-Speed Water Channel

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Abstract
The paper describes a high-speed recirculating water channel which has been developed so that the flow in the working section is uniform and the water surface is flat and horizontal over a wide speed range, including the critical Froude number related to channel depth. The working section is 1.37 m wide, 0.84 m deep, and the speed can be varied from 0.03 m/s to 6.1 m/s, corresponding to a Froude number range of 0.01 to 2.12. A surface injection system has been developed to offset the momentum defect at the free surface caused by the boundary layer growing on the upper surface of the enclosed contraction. It is concluded that a surface injection system is necessary for the successful operation of any future water channel with an enclosed contraction.

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