| 摘要 |
This invention provides a single cascade multistage turbine that has a compact turbine structure having only a single cascade, and enables power to be extracted efficiently in the same way as a multistage turbine having multistage rotor vanes. The working fluid supplied through the supply duct 3 flows on one side of the single cascade of rotor vanes 2 to one part of the circumference direction of the rotor vanes 2 , and after passing through the rotor vanes 2 it passes through the circulation ducts 4 a and 4 b and returns to the former side of the rotor vanes 2 . The circulation ducts 4 a and 4 b consist of exhaust duct members 6 a and 6 b, return duct members 7 a and 7 b, and inflow duct members 8 a and 8 b. Using the circulation ducts 4 a and 4 b this circulation process is repeated at least once whereby the working fluid is again passed through the rotor vanes 2 at a slightly different position in the circumferential direction of the rotor vanes 2 . Each time the working fluid is passed through the rotor vanes 2 , the energy contained in the fluid can be efficiently extracted as torque of the rotor vanes 2.
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