Reaction water turbine fixed guide vane resonance and crack prevention method

A technology for fixing guide vanes and water turbines, which is applied in the field of water turbines, can solve the problems of whistling, affecting the working stability of the hydraulic turbine, and fixing guide vanes cracks, etc. Effect

Inactive Publication Date: 2018-10-09
DONGFANG ELECTRIC MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The Karman vortex frequency at the outlet of the fixed guide vane on the seat ring is easy to coincide with the natural frequency of the fixed guide vane, resulting in hydraulic elastic resonance, resulting in cracks in the fixed guide vane, and the turbine produces howling noise, which affects the working stability of the turbine

Method used

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  • Reaction water turbine fixed guide vane resonance and crack prevention method
  • Reaction water turbine fixed guide vane resonance and crack prevention method
  • Reaction water turbine fixed guide vane resonance and crack prevention method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] see figure 1 and figure 2 , the method for preventing cracks from resonating on fixed guide vanes of an impact turbine comprises the following steps:

[0041] a. Determine the empennage 4 according to the geometric dimensions of the section of the fixed guide vane 3 on the seat ring of the impact turbine, and process the empennage 4 for standby;

[0042] b. Reserve a distance h between the upper end of the empennage and the upper ring plate 1 , reserve a distance h between the lower end of the empennage and the lower ring plate 2 , h 1 1% of fixed guide vane height h, h 2 1% of fixed guide vane height h;

[0043] c. Install the empennage 4 on the water outlet edge of the fixed guide vane 3 .

[0044] "a. Determine the empennage according to the geometric dimensions of the fixed guide vane section on the seat ring of the impact turbine, and process the empennage for use; b. Reserve a distance h between the upper end of the empennage and the upper ring plate 1 , r...

Embodiment 2

[0046] see figure 1 and image 3 , the method for preventing cracks from resonating on fixed guide vanes of an impact turbine comprises the following steps:

[0047] a. Determine the empennage 4 according to the geometric dimensions of the section of the fixed guide vane 3 on the seat ring of the impact turbine, and process the empennage 4 for standby;

[0048] b. Reserve a distance h between the upper end of the empennage and the upper ring plate 1 , reserve a distance h between the lower end of the empennage and the lower ring plate 2 , h 1 2% of fixed guide vane height h, h 2 2% of fixed guide vane height h;

[0049] c. Install the empennage 4 on the water outlet edge of the fixed guide vane 3 .

[0050] In the step c, the empennage 4 is welded to the water outlet edge of the fixed guide vane 3 by root cleaning and penetration.

[0051] The seat ring of the impact turbine includes an upper ring plate 1, a lower ring plate 2 and a plurality of fixed guide vanes 3 fixe...

Embodiment 3

[0054] see figure 1 and image 3 , the method for preventing cracks from resonating on fixed guide vanes of an impact turbine comprises the following steps:

[0055] a. Determine the empennage 4 according to the geometric dimensions of the section of the fixed guide vane 3 on the seat ring of the impact turbine, and process the empennage 4 for standby;

[0056] b. Reserve a distance h between the upper end of the empennage and the upper ring plate 1 , reserve a distance h between the lower end of the empennage and the lower ring plate 2 , h 1 3% of fixed guide vane height h, h 2 3% of fixed guide vane height h;

[0057] c. Install the empennage 4 on the water outlet edge of the fixed guide vane 3 .

[0058] In the step c, the empennage 4 is welded to the water outlet edge of the fixed guide vane 3 by root cleaning and penetration.

[0059] The seat ring of the impact turbine includes an upper ring plate 1, a lower ring plate 2 and a plurality of fixed guide vanes 3 fixe...

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Abstract

The invention discloses a reaction water turbine fixed guide vane resonance and crack prevention method and belongs to the field of water turbines. The method is characterized by comprising the following steps of a, determining tail vanes according to the geometric dimensions of the cross section of fixed guide vanes and machining the tail vanes for standby application; b, reserving a distance h1between the upper ends of the tail vanes and an upper ring plate, and reserving a distance h2 between the lower ends of the tail vanes and a lower ring plate, wherein h1 is 1-5% of the height h of thefixed guide vanes, and h2 is 1-5% of the height h of the fixed guide vanes; and c, installing the tail vanes to the water outlet edges of the fixed guide vanes. According to the method, the tail vanes are mounted on the fixed guide vanes of a water turbine, the excitation frequency of a karman vortex street can be increased, and exciting energy of the karman vortex street can be reduced, and thenthe frequency of the karman vortex street of outlets of the fixed guide vanes and the inherent frequency of the fixed guide vanes are staggered to prevent hydraulic elastic resonance, the fixed guidevanes are protected against cracks, the water turbine is protected again squealing, and the operating stability of the water turbine is guaranteed.

Description

technical field [0001] The invention relates to the field of water turbines, in particular to a method for preventing cracks from resonating on fixed guide vanes of counteraction water turbines. Background technique [0002] The fixed guide vane of the impact turbine has two functions, one is to guide the water flow from the volute of the turbine evenly into the movable guide vane as a flow-passing part; Transfer to concrete foundation. Due to the advancement of the hydraulic design technology of the reaction turbine, the fixed guide vane designed with the latest technology rarely has the problem of hydraulic elastic resonance. However, there are two reasons why this resonance phenomenon occasionally occurs in some impact turbines that have been put into operation. First, the existing hydraulic design technology is still difficult to accurately predict the frequency of the Karman vortex street at the outlet of the fixed guide vane; second. It is due to the increase in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F03B3/18F03B11/04F03B11/00
CPCF03B3/18F03B11/00F03B11/04Y02E10/20
Inventor 石清华龚莉龚英周小南刘辉
Owner DONGFANG ELECTRIC MACHINERY
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