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A Method for Eliminating Vortex in the Tail Water of Francis Turbine Based on Variable Speed ​​Technology

A water turbine and Francis flow technology, applied in the field of water conservancy and power generation, can solve the problem that the draft tube vortex elimination technology cannot meet the requirements, etc., and achieve the effects of expanding the effective operating range, reducing the vibration area, and avoiding cavitation and cavitation erosion.

Active Publication Date: 2022-03-08
SICHUAN UNIV
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Problems solved by technology

However, the existing draft tube vortex elimination technology obviously cannot meet the requirements

Method used

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  • A Method for Eliminating Vortex in the Tail Water of Francis Turbine Based on Variable Speed ​​Technology
  • A Method for Eliminating Vortex in the Tail Water of Francis Turbine Based on Variable Speed ​​Technology
  • A Method for Eliminating Vortex in the Tail Water of Francis Turbine Based on Variable Speed ​​Technology

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Embodiment

[0034] A mixed-fluid turbine tail wool removal method based on variable speed technology, including the following steps: determining unit operating conditions, adjustment unit speed to the optimal speed under this working condition, so that the water flow of the turbine wheel outlet absolute speed is arbitrary Under the working conditions, it is always perpendicular to the circumferential speed of the turbine wheel outlet, avoiding the production of tail tube vortex strips, and fundamentally eliminates tail water repeater.

[0035] In another embodiment, the method of determining the optimum speed of the unit is as follows:

[0036] S1, set variable: running speed N, optimal speed N 0 (The tail water repeater disappears with the corresponding speed, changes with the working conditions), design the speed N r The unit operates the water head H. r The relative speed is The relative optimal speed is Relative to the water head

[0037] S2, determine the operating conditions of the u...

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Abstract

The invention discloses a method for eliminating the vortex in the tailwater of a Francis turbine based on variable speed technology. 0 The relationship model between the operating water head H of the unit: adjust the speed of the unit to the optimal speed under this working condition, so that the absolute speed of the water flow at the outlet of the turbine runner is always perpendicular to the peripheral speed of the outlet of the turbine runner under any working condition, avoiding Generation of draft tube vortex. The present invention can control the velocity circulation of the water flow at the outlet of the runner by controlling the optimum rotational speed of the Francis turbine under different water heads and different opening degrees, thereby avoiding the generation of the tail water vortex at the root.

Description

Technical field [0001] The present invention relates to the field of water conservancy power generation, and more particularly to a mixed-fluid turbine tailor tissue with a variable speed technology. Background technique [0002] The turbine is a key component of hydropower to achieve water energy utilization. The mixed flow turbine is widely used in high efficiency and wide application range. In addition to the power generation tasks in the power system, it is often necessary to bear the frequency modulation and peset task. Thus, it often deviates from the design conditions to operate, resulting in a tail water tube vortex, resulting in a decrease in performance, vibration, making the unit operating conditions deteriorate, threat the unit safe and stable operation, or even serious accidents, leading to major economic losses. [0003] Therefore, people have always tried to eliminate the effects of tail water repeats, and some improvement methods or devices have been proposed. [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F03B11/04F03B15/00F03B3/02
CPCF03B11/04F03B15/00F03B3/02Y02E10/20
Inventor 张昌兵王彤彤谢婷婷曹文哲
Owner SICHUAN UNIV
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