Determination of the lifting force and rational form of vertical lift-falling gates

Conclusions

• 1. 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.

• 2. For determining the lifting force by the given method there is no need for costly and labor-intensive experimental investigation.

• 3. 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.

• 4. 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° to the vertical conjugate with it and with a seal transferred to the sill. Such a design with a small lifting force improves the hydraulic 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.