Numerical Simulation on Hydraulic Performance of Tailrace Surge Tanks Shared by Two Units
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Abstract:
In this paper, computational fluid dynamics (CFD) method was used to simulate several typical working conditions of tailrace surge tanks shared by two units. The flow velocity distribution under the surge tank, head loss, and flow rate of water flowing into or out of the surge tank through the two impedance holes were obtained and analyzed. In addition, the simulated flow patterns under different working conditions were analyzed and compared with those obtained from experimental results. The results indicated that the head loss coefficient for water flowing into or out of the surge tank increases with the increasing of flow rate and the head loss coefficient under single-unit operation is lower than that under two-unit operation. Moreover, the flow rates of water flowing into or out of the surge tank through the two impedance holes shared by two units were not the same under single-unit operation and they were affected by the variation of discharge ratio.
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