TY - JOUR
T1 - High Specific-Speed Kaplan Turbine-Cascade Whose Perfomance Scarcely Changes with Cavitation Number
AU - Soyama, Hitoshi
AU - Narasaka, Tsutomu
AU - Oba, Risaburo
AU - Oshima, Ryoichro
AU - Satoh, Johshiro
AU - Tanabe, Seiichi
AU - Shimmei, Katsumasa
PY - 1992
Y1 - 1992
N2 - In order to find low-drag thin hydorfoils in cascades applicable to Kaplan turbines, we systematically investigate the subcavitating perfomance and the cavitation aspects around circular-shape hydrofoils for two cascade arrangements of various cavitation numbers and incidences. Our previous paper showed that the separation bubble near the leading edge, especially a long bubble, markedly increases the drag for thin hydrofoils in the cascade of present interest. Hence we investigate the behavior of the long bubble here. We try to suppress the long bubble, so that there is a marked increase in drag, by applying accelerating cascade effects of high-cambered hydrofoils effectively. We find a superior cascade hydorfoil, whose perfomance scarcely changes with cavitation number.
AB - In order to find low-drag thin hydorfoils in cascades applicable to Kaplan turbines, we systematically investigate the subcavitating perfomance and the cavitation aspects around circular-shape hydrofoils for two cascade arrangements of various cavitation numbers and incidences. Our previous paper showed that the separation bubble near the leading edge, especially a long bubble, markedly increases the drag for thin hydrofoils in the cascade of present interest. Hence we investigate the behavior of the long bubble here. We try to suppress the long bubble, so that there is a marked increase in drag, by applying accelerating cascade effects of high-cambered hydrofoils effectively. We find a superior cascade hydorfoil, whose perfomance scarcely changes with cavitation number.
KW - Blade
KW - Cascade
KW - Cavitation
KW - Separation
KW - Water Turbine
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U2 - 10.1299/kikaib.58.1361
DO - 10.1299/kikaib.58.1361
M3 - Article
AN - SCOPUS:85007689954
VL - 58
SP - 1361
EP - 1366
JO - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
JF - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
SN - 0387-5016
IS - 549
ER -