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Turbulent flow around a bend in a circular pipe
Conclusions A study of the distribution of flow parameters, in particular, of the pressure on the wall and in the flow, made it possible to determine the location of the zone of most likely occurrence of cavitation in a penstock. Using these data, we can predict the region of cavitation erosion of the penstock walls.The location of the zone of separation in the bend of a penstock can be determined from the measured profiles of the mean velocity.The investigations established the zones of the disturbing influence of a bend up-and downstream. The length of these zones with respect to mean velocities and pressures was substantially less than the values usually assumed [4, 5]. This permits reducing the distance between the bend and gate apparatus of the turbine, which improves the layout and reduces the cost of constructing the penstock.The proposed empirical formulas for calculating the resistance coefficient of bends with a relative radius of curvature 1≤R/d≤3 agree well with the experimental data of the investigations and [3]. They permit reducing ζ by 20% on average in the range of Reynolds numbers 2×$ 10^{4} $≤Re≤4×$ 10^{5} $.
Turbulent flow around a bend in a circular pipe
Conclusions A study of the distribution of flow parameters, in particular, of the pressure on the wall and in the flow, made it possible to determine the location of the zone of most likely occurrence of cavitation in a penstock. Using these data, we can predict the region of cavitation erosion of the penstock walls.The location of the zone of separation in the bend of a penstock can be determined from the measured profiles of the mean velocity.The investigations established the zones of the disturbing influence of a bend up-and downstream. The length of these zones with respect to mean velocities and pressures was substantially less than the values usually assumed [4, 5]. This permits reducing the distance between the bend and gate apparatus of the turbine, which improves the layout and reduces the cost of constructing the penstock.The proposed empirical formulas for calculating the resistance coefficient of bends with a relative radius of curvature 1≤R/d≤3 agree well with the experimental data of the investigations and [3]. They permit reducing ζ by 20% on average in the range of Reynolds numbers 2×$ 10^{4} $≤Re≤4×$ 10^{5} $.
Turbulent flow around a bend in a circular pipe
Gontsov, N. G. (author) / Marinova, O. A. (author) / Tananaev, A. V. (author)
1984
Article (Journal)
English
BKL:
56.30
Wasserbau
Local classification TIB:
770/6550/8000
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