A Francis turbine with long and short blades

A technology of long and short blades and water turbines, which is applied in the field of hydraulic machinery, can solve the problems of affecting the flow capacity of the runner, the complex structure of the blades, and the high cost of processing and installation, so as to improve efficiency and operation stability, reduce manufacturing costs, and improve operation. efficiency effect

Active Publication Date: 2020-04-07
NORTHWEST A & F UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent application 201710822929.6 discloses a double-click water turbine runner with long and short blades. The blade structure is simple and easy to operate and maintain, but there are obvious problems of unreasonable structural design, such as small water flow area and weak working ability.
Chinese patent application 201310704054.1 discloses a Francis pump-turbine, which uses three blades of different lengths to reduce the secondary flow loss. The flow capacity of the runner will further affect the output effect

Method used

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  • A Francis turbine with long and short blades
  • A Francis turbine with long and short blades
  • A Francis turbine with long and short blades

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Experimental program
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Embodiment

[0069] The runner includes 9 short blades 5 and 9 long blades 6 each, and the outflow diameter ratio of the long and short blades is 0.336, and the long blade wrap angle α=70°. The long blade 6 of the runner is a three-dimensional twisted curved surface, which is divided into four sections according to the bone line in the height direction of the blade, and the dotted line shows the profile line of each section blade.

[0070] The cross-section of the wrapping volute is elliptical, and the length ratio of each ellipse is equal to 1.618. The variation trend equation of the elliptical cross-sectional area of ​​the volute around the circumference is: y=-0.041x+0.239, and the wrapping angle is 318°.

[0071] 16 single-row negative curvature guide vanes are evenly distributed in the circumferential direction, and the diameter of the guide vane 3 distribution circle is D V With runner inlet diameter D I Ratio is 2.1916, guide vane 3 throat diameter D T With runner inlet diameter D...

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Abstract

The invention discloses a mixed flow type splitter blade water turbine. The overflowing area of the water turbine comprises a volute, a guide blade area, a rotating wheel and a draft tube which are connected in sequence, blades of the rotating wheel are formed by multiple long blades and short blades in a spaced manner, the length ratio of the oval cross section of the volute is the golden sectionproportion, the guide blade profile is in a negative curvature crescent shape, the blades of the rotating wheel are jointly formed by the long blades and the short blades, the inlet and outlet diameter difference ratio of the short blades and the long blades is 0.859, and rectifier plates are arranged in the conical draft tube. Efficient use of water flow energy is achieved, the running stabilityof a unit is improved while the work efficiency of the water turbine is improved, the water turbine has the wide application prospects and the popularization value, and the water turbine has the important significance in small hydropower station transformation and improving of the running stability of power plant units of the China at present.

Description

technical field [0001] The invention belongs to the technical field of hydraulic machinery, in particular to a mixed-flow water turbine with long and short blades. Background technique [0002] The environment is the basic prerequisite for the survival and development of human society. With the enhancement of human environmental awareness and the implementation of sustainable development strategies, thermal power generation is gradually restricted. On the other hand, immature new energy technologies hinder the development of wind power, solar energy and nuclear power. . Relatively speaking, hydropower with mature technology is favored, and water resources are renewable green energy. The key to hydropower generation lies in the performance of the unit. The main indicators include the utilization efficiency of water flow energy, which is related to the safe operation of the unit and the life stability and cavitation performance. In the final analysis, the reason affecting the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F03B3/12F03B3/02
CPCF03B3/02F03B3/121Y02E10/20
Inventor 毛秀丽陈帝伊李全武毛高强
Owner NORTHWEST A & F UNIV
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