Surface roughness Ra of various components (microns)
Drop in hhP %
Spiral casing
Guide vane
Runner
Draft tube
Disc friction
X as computed
*X=1 if X 1
1
0.9
0.4
0.4
0.9
0.4
No drop
No drop
2
0.9
0.8
0.8
0.9
0.8
0.04946
0.0700
3
0.9
1.6
1.6
0.9
1.6
0.1819
0.1956
4
0.9
3.2
3.2
0.9
3.2
0.3786
0.3923
5
0.9
6.4
6.4
0.9
6.4
0.6454
0.6591
*X <= indicates hydraulically smooth flow, when X can be taken as 1 and drop in efficiency computed. Results thus obtained and given in the last column shows insignificant change.
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