Hydraulic Structures: Fourth Edition

12.8.8 Draft tubes The draft tube is a conduit discharging water from the runner to the tail race, and has a twofold purpose: (a ...

OTHER COMPONENTS OF HYDROPOWER PLANTS 517 it also has the desirable effect of directing the flow in the direction of the tailwat ...

pressure relief valves; surge tanks; turbine governors; generators; the power house superstructure; cranes; a switπch yard for t ...

OTHER COMPONENTS OF HYDROPOWER PLANTS 519 The forebay functions as a small balancing reservoir (with spilling arrangements) upst ...

between the support and expansion joints, and longitudinal movements over the supports due to temperature changes. The energy of ...

OTHER COMPONENTS OF HYDROPOWER PLANTS 521 12.9.3 Turbine governors The governor is a mechanism controlling the rotational speed ...

A rapid closing or opening of the nozzle or guide vanes (gates) is undesirable, as serious waterhammer problems may result in th ...

OTHER COMPONENTS OF HYDROPOWER PLANTS 523 rev min^1 , their sizes being about 3 m high and 2.5–5 m in diameter. Hori- zontal sha ...

reduced considerably by housing individual generators only (outdoor power house), although it has the disadvantage that maintena ...

SURGE TANKS 525 12.10 Surge tanks 12.10.1 General Surge tanks may be considered essentially as a forebay close to the machine. T ...

Asc 45 D10/3/H 0 (12.31) whereDis the diameter of the tunnel (in m). The maximum upsurge and downsurge should be contained with ...

SURGE TANKS 527 Instantaneous 100% demand conditions result in too large a maximum downsurge, as the normal practice is to allow ...

reacts quickly, creating accelerating or decelerating heads, and at the same time the expansion chambers minimize the maximum up ...

SMALL HYDRAULIC POWER PLANT DEVELOPMENT 529 while the riser itself responds quickly to maintaining the desired level. The differ ...

530 HYDROELECTRIC POWER DEVELOPMENT energy of the water and are built of steel; their efficiencies are about 85% (overshot) and ...

force. The operational principle of a tidal power plant remains the same as that of the tidal mills, but the turbine units may p ...

technological developments since the completion of the La Rance power scheme have stimulated the construction of smaller tidal p ...

Worked Example 12.1 The average monthly flows of a stream in a dry year are as follows: Month J F M A M J J A S O N D Q(m^3 s^1 ...

The power to be supplemented by the storage or standby unit to obtain a firm power of 15 MW is the area abc (Fig. 12.23)17.76 ...

Solution Referring to the mass curve plot between cumulative flows and months in Fig. 12.24 we obtain the following. The unifor ...