Passage of waste discharges through blocks with vertical units

Conclusions

• 1. The investigations showed that passage of waste discharges through the waterway of the turbine-generator unit block with the turbine runner or blades disassembled is an acceptable scheme of passage in the operating period of a hydrostation when repairing the unit. In this case the maximum discharge capacity of the turbine block fora _omax, H_d is Q=l.62Q_max (for the disassembled turbine runner) and Q=l.65Q_max (for the disassembled runner blades).

• 2. The maximum discharge capacity in the case of an assembled blade system of the unit is obtained also fora _omax, ϕ=+22.5°. However, passage of the waste discharge while preserving the rotational speed of the unit close to the nominal is possible only for small heads H=0.35−0.54. When n_t=n_n, ϕ=+22.5°,a _omax, the head at which discharge of water through the unit is possible is 0.45H_d.

• 3. The presence in the waterway of an additional resistance in the form of gates in the outlet diffuser of the draft tube makes it possible to pass waste discharges Q=(l−1.2) Q_max is a wide range of heads acting on the hydrostation H=(0.35−1.3)H_d while preserving the rotational speed of the unit close to the nominal n_t=(0.9–l.l) n_n.

• 4. An additional check of the indicated variants with an investigation of the strength of individual elements and components of the turbine block for particular conditions of the hydropower plant is necessary for a final recommendation of the scheme of passing waste discharges through the powerhouse part of a hydrodevelopment.