DETERMINATION OF THE LIFTING FORCE AND RATIONAL FORM OF VERTICAL LIFT-FALLING GATES.

The investigation performed and the method of calculations developed make it possible to determine with an accuracy sufficient for practice the lifting force of lift-falling gates with a flat inclined deflector for practically any combinations of the main parameters determining this quantity. The head on the sill, height of lifting the gates, and angle of inclination of the stream deflector to the vertical have the maximum effect on the lifting force. The most rational design of lift-falling gates is that with a deflector described at first by a circle with a radius of 1. 5 m and then by a line inclined at an angle of 50 degree to the vertical conjugate with it and with a seal transferred to the sill. Such a design with a small lifting force improves the hydraulics of the flow in the region of the gates and provides a high discharge coefficient. The latter makes it possible to reduce the gate operating cycle and to shorten the length of the rod of the hydraulic cylinder.