3 Hydrodynamics
229
t
Fig. 3.54 Oscillatory flow of water body in U pipeline
reservoir
Surge shaft
Surge shaft water level fluctuation
Surge shaft
system
Pressure piping
Hydraulic
turbine
H
z
3-3
0
0
Wake channel
cutoff
Q=0
1-1
2-2
Fig. 3.55 Water level fluctuation of pressure regulating system of hydropower
station
liquid flow rate in the system change rapidly, thus causing the liquid flow
pressure to change rapidly and propagate in the pipeline in the form of
pressure wave. For example, the sudden closing and opening of valves in
the water diversion system, the sudden start-up and shutdown of the pump
station, and the sudden change in generator load during the operation of the
hydropower station will cause water hammer in the pipeline system, as shown
in Figs. 3.56, 3.57, 3.58.
H 0
C
Fig. 3.56 Water hammer fluctuation process of sudden closing of water diversion
pipeline valve
229
t
Fig. 3.54 Oscillatory flow of water body in U pipeline
reservoir
Surge shaft
Surge shaft water level fluctuation
Surge shaft
system
Pressure piping
Hydraulic
turbine
H
z
3-3
0
0
Wake channel
cutoff
Q=0
1-1
2-2
Fig. 3.55 Water level fluctuation of pressure regulating system of hydropower
station
liquid flow rate in the system change rapidly, thus causing the liquid flow
pressure to change rapidly and propagate in the pipeline in the form of
pressure wave. For example, the sudden closing and opening of valves in
the water diversion system, the sudden start-up and shutdown of the pump
station, and the sudden change in generator load during the operation of the
hydropower station will cause water hammer in the pipeline system, as shown
in Figs. 3.56, 3.57, 3.58.
H 0
C
Fig. 3.56 Water hammer fluctuation process of sudden closing of water diversion
pipeline valve