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Low-specific-speed mixed-flow water turbine with double-inlet volute

A low specific speed, double inlet technology, applied in the field of water turbines, can solve problems such as optimization of water inlet conditions, achieve good hydraulic performance and operating efficiency, enhance velocity components, and improve water flow conditions

Inactive Publication Date: 2020-08-14
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it only changes the cross-sectional shape of the volute, and does not optimize the water inlet conditions
[0004] In addition, the existing volutes are designed with one-way water inlet, and the section of the volute structure section gradually decreases to form the necessary circulation in front of the water guiding mechanism.

Method used

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  • Low-specific-speed mixed-flow water turbine with double-inlet volute
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  • Low-specific-speed mixed-flow water turbine with double-inlet volute

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Experimental program
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Effect test

Embodiment 1

[0107] The number of the fixed guide vanes 2 is set to 15-20. The number of the movable guide vanes 3 is set to 20-30.

Embodiment 2

[0109] Taking the application of the Francis turbine with double-inlet volute proposed by the present invention in a power station as an example, the water head of the power station is 76m, the design flood flow is 25500m3 / s, and the specific speed of the turbine is 196m·kW.

[0110] The parameters of the optimal design of the present invention are: the ratio of the long and short axes of the elliptical section of the volute structure section of the double inlet volute is 1.05:1; the number of fixed guide vanes is 12; the number of movable guide vanes is 24; the diameter of the runner inlet The outlet diameters are 5400mm and 6050mm respectively; the number of blades is 14; the draft tube adopts an elbow-shaped draft tube, the elevation angle of the top plate of the water outlet diffusion section is 11°, and the width of the middle pier is 2000mm.

Embodiment 3

[0112] The specific application process of the present invention is as follows: the pressurized water flow in the water inlet channel enters from the water inlets of the straight pipe sections at the two nose ends, and generates a center-symmetrical tangential flow in the circumferential direction of the double inlet volute, so that the water flow enters the water guide A sufficient circulation is generated before the mechanism, and the water flowing out of the water guiding mechanism enters the runner area, drives the runner to rotate and do work, and the potential energy and kinetic energy of the water flow are converted into mechanical energy. The water flow comes out from the runner and is discharged downstream through the draft tube.

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Abstract

The invention discloses a low-specific-speed mixed-flow water turbine with a double-inlet volute. An annular opening in the inner side of the double-inlet volute is provided with a connecting base ring; the inner periphery of the connecting base ring is provided with a circle of fixed guide vanes; the outer periphery of the connecting base ring is provided with a circle of movable guide vanes; aninner ring of the connecting base ring is sleeved with a rotating wheel; the lower portion of the connecting base ring is connected with the front end of a tail water pipe; the vanes in the rotating wheel are configured as X-type unequal-thickness distortional vanes; and the front surfaces and back surfaces of the vanes are smoothly connected from top to bottom by virtue of different-curvature curved surfaces. Two water inlets of the low-specific-speed mixed-flow water turbine disclosed by the invention are the uniformity of water flow in the circumferential direction of the volute is improvedand the velocity component of the water flow in the circumferential direction is enhanced, thereby effectively increasing the circular rector of the coming water flow, improving the condition of thewater flow entering a water guide mechanism, reducing hydraulic loss of the water guide mechanism and thus achieving good hydraulic performance and running efficiency of the low-specific-speed mixed-flow water turbine.

Description

technical field [0001] The invention relates to a low specific speed Francis water turbine with a double-inlet volute, belonging to the technical field of water turbines. Background technique [0002] The Francis turbine is currently the most widely used type of turbine, and its main components include a water diversion chamber, a seat ring, a water guide mechanism, a runner and a draft tube. As the water diversion part of the turbine, from the hydraulic point of view, its function is to make the water flow form a circulation, so as to ensure that the water flow can enter the seat ring and the movable guide vane at a small angle of attack, and reduce the hydraulic loss of the water guide mechanism. [0003] A water turbine in the prior art sets all cross-sections of the spiral structure section of the volute to be elliptical to effectively increase the diameter of the runner to increase the output of the unit. However, it only changes the cross-sectional shape of the volute...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F03B3/18F03B3/12F03B3/02
CPCF03B3/02F03B3/121F03B3/125F03B3/186Y02E10/20
Inventor 陈雅楠周大庆陈会向阚阚郑源苏文博邵煜
Owner HOHAI UNIV
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