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A platform for research: civil engineering, architecture and urbanism
Improvement of the operating reliability of bulb units
Conclusions 1. Studies of the axial hydrodynamic forces permitted determining the loads which are transmitted by the heel and the counterheel in a bulb unit. 2. The results indicate that the value of the equivalent axial hydrodynamic force depends basically upon the opening of the turbine control and upon the equivalent discharge. The type of runner and the speed exert an indirect effect, since they affect the variation of Q'I. In this connection, the obtained data can be used for preliminary analyses of the operating regimes of bulb units with similar geometrical designs of the internal passages, but with different types of runners. 3. In the absence of the possibility of direct measurement of the axial hydrodynamic force under steady regimes, this force can be calculated with a departure of 10–15% from the true value, by using the results of the pressure measurements along the radius on the turbine cover or directly inside the flow in the runner zone. The results of the tests for vertical turbines cannot be used directly for bulb units, since the differences in the shapes of the internal passages and the construction of the turbine control lead to an appreciable variation in the pressure distribution and in the value of the axial forces even for runners of the same type.
Improvement of the operating reliability of bulb units
Conclusions 1. Studies of the axial hydrodynamic forces permitted determining the loads which are transmitted by the heel and the counterheel in a bulb unit. 2. The results indicate that the value of the equivalent axial hydrodynamic force depends basically upon the opening of the turbine control and upon the equivalent discharge. The type of runner and the speed exert an indirect effect, since they affect the variation of Q'I. In this connection, the obtained data can be used for preliminary analyses of the operating regimes of bulb units with similar geometrical designs of the internal passages, but with different types of runners. 3. In the absence of the possibility of direct measurement of the axial hydrodynamic force under steady regimes, this force can be calculated with a departure of 10–15% from the true value, by using the results of the pressure measurements along the radius on the turbine cover or directly inside the flow in the runner zone. The results of the tests for vertical turbines cannot be used directly for bulb units, since the differences in the shapes of the internal passages and the construction of the turbine control lead to an appreciable variation in the pressure distribution and in the value of the axial forces even for runners of the same type.
Improvement of the operating reliability of bulb units
Arshenevskii, N. N. (author) / Levina, S. I. (author)
Hydrotechnical Construction ; 7 ; 565-569
1973-06-01
5 pages
Article (Journal)
Electronic Resource
English
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