CN105275711A - Hydraulic design method for bent tail water pipe of hydraulic turbine device - Google Patents

Hydraulic design method for bent tail water pipe of hydraulic turbine device Download PDF

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Publication number
CN105275711A
CN105275711A CN201510679261.5A CN201510679261A CN105275711A CN 105275711 A CN105275711 A CN 105275711A CN 201510679261 A CN201510679261 A CN 201510679261A CN 105275711 A CN105275711 A CN 105275711A
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China
Prior art keywords
draft tube
hydraulic turbine
hydraulic
water pipe
tail water
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CN201510679261.5A
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Chinese (zh)
Inventor
朱荣生
陈宗良
付强
王秀礼
张亮亮
钟华舟
张本营
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Jiangsu University
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Jiangsu University
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Priority to CN201510679261.5A priority Critical patent/CN105275711A/en
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/20—Hydro energy

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  • Hydraulic Turbines (AREA)

Abstract

The invention relates to a hydraulic design method for a bent tail water pipe of a hydraulic turbine device. A design formula of the right cone pipe segment inlet diameter, the right cone pipe segment outlet diameter, the right cone pipe segment flare angle, the tail water pipe depth, the tail water pipe right cone pipe segment depth, the tail water pipe length, the tail water pipe bent segment outlet height, the tail water pipe bent segment length, the tail water pipe diffusion segment section width, the tail water pipe outlet height, the tail water pipe outlet buttress width and the tail water pipe outlet buttress inlet fillet radius of the bent tail water pipe of the hydraulic turbine device is given. According to the bent tail water pipe, designed through the design method, of the hydraulic turbine device, the internal flowing condition of the tail water pipe of a hydraulic turbine is improved, and the efficiency of the hydraulic turbine for recycling residual liquid energy and the unit stability are improved.

Description

A kind of hydraulic turbine installation flexure type draft tube Hydraulic Design Method
Technical field
The present invention relates to a kind of hydraulic turbine draft tube Hydraulic Design Method, particularly relate to a kind of hydraulic turbine installation flexure type draft tube Hydraulic Design Method.
Background technique
Pump is reversible rotating machinery, and hydraulic turbine is that operating turbine is made in pump reversion, realizes the recycling to highly pressurised liquid, is therefore also called pump and makes turbine (pumpasturbine, PAT).Hydraulic turbine has the advantages such as volume is little, structure is simple, cost is low, easy to maintenance, the field of energy-saving technology extensive application such as recovery and small water conservancy hydroelectric resources Application and Development of residual pressure liquid energy in chemical industry processing procedure.The unsteady pressure of hydraulic turbine interior flow field is one of key factor affecting unit operation stability.And existing mini hydraulic turbine installation selects existing pump usually, at the beginning of design, do not consider the vortex rope even cavity cavitation phenomenon of pump operation pump water inlet section and hydraulic turbine water exit end under reversing damped condition.The unsteady motion of vortex rope in draft tube can cause the vibration of unit.Moreover, fluid still keeps larger speed in outlet port after hydraulic turbine impeller, and especially in the hydraulic turbine unit of low water head, the kinetic energy of impeller outlet account for the great share of gross head.Compared to common right cone tubular type draft tube, flexure type draft tube conveniently has unique advantage at hydraulic performance.When ensureing that the main flow passage components of existing hydraulic turbine installation are substantially constant, reaching recovered energy by the structure improving draft tube and slowing down the object of unit vibration.
Summary of the invention
For solving the problem, the invention provides a kind of hydraulic turbine installation flexure type draft tube Hydraulic Design Method.By designing the several significant dimensions parameter of draft tube of hydraulic turbine installation and adopting flexure type draft tube, thus improve hydraulic turbine draft tube internal flow situation, improve hydraulic turbine and recycle the efficiency of residual liquid energy and the stability of unit.
Realize the design method that above-mentioned purpose adopts:
1. throat cone section inlet diameter
Throat cone section inlet diameter formula
D 3 = ( 1.25 + 0.0845 lg Q n 3 ) D j
In formula, D 3-throat cone section inlet diameter, mm;
Q-hydraulic turbine flow, m 3/ s;
D j-hydraulic turbine outlet diameter, mm;
N-hydraulic turbine rotating speed, r/min;
2. throat cone section outlet diameter
Throat cone section outlet diameter formula
D 4 = 1.35 1 + 0.7 n s - 0.658 D 3
In formula, D 4-throat cone section outlet diameter, mm;
D 3-throat cone section inlet diameter, mm;
N s-hydraulic turbine specific speed;
3. throat cone section angle of flare and height
Throat cone section angle of flare and high computational formula
β = arctan D 4 - D 3 2 ( H - H 1 - D 4 )
H 1 = ( 1 - 0.0689 1 ( n s / 100 ) 1.128 ) D 3 + D 4 2
In formula, β-throat cone section angle of flare, °;
D 4-throat cone section outlet diameter, mm;
D 3-throat cone section inlet diameter, mm;
The H-draft tube degree of depth, mm;
H 1-throat cone section the degree of depth, mm;
N s-hydraulic turbine specific speed;
4. the draft tube degree of depth and length
The draft tube degree of depth and length computation formula
H = 24.31 k ( n s 100 ) - 0.5 Q n 3 k = 0.9031 e 0.0004 n s
L＝(1.65～1.75)H
In formula, the H-draft tube degree of depth, mm;
K-draft tube adjusting for depth coefficient, k=0.925 ~ 1;
N s-hydraulic turbine specific speed;
Q-hydraulic turbine flow, m 3/ s;
N-hydraulic turbine rotating speed, r/min;
L-draft tube length, mm;
5. draft tube bending section length, outlet height
Draft tube bending section length, outlet height formula
h＝0.5(H-H 1)
l = ( 1 + 3.25 ( n s / 100 ) 1.128 ) D 4
In formula, h-draft tube bending section outlet height, mm;
The H-draft tube degree of depth, mm;
N s-hydraulic turbine specific speed;
H 1-throat cone section the degree of depth, mm;
D 4-throat cone section outlet diameter, mm;
L-draft tube bending section length, mm;
6. draft tube diffuser geomery
Draft tube diffuser adopts the structural type of rectangular cross section, and diffuser upper cover plate and substantially horizontal angle α meet following formula:
α≤8°
Section width B, draft tube outlet height h smeet following relation:
B＝(0.95～1.02)H
h s＝h+(L-l)tanα
Draft tube diffuser adopts single buttress, and buttress is arranged between two parties.Buttress length and the same length of diffusing tube, buttress inlet cavetto, all the other key dimensions meet following relation:
b / B = 0.1 ~ 0.15 R = ( 2 ~ 3 ) b
R＝(2～3)b
In formula, h-draft tube bending section outlet height, mm;
The H-draft tube degree of depth, mm;
B-draft tube diffuser section width, mm;
L-draft tube length, mm;
L-draft tube bending section length, mm;
H s-draft tube outlet height, mm;
B-draft tube outlet buttress width, mm;
R-draft tube outlet buttress inlet fillet radius, mm;
The invention has the beneficial effects as follows: the hydraulic turbine installation flexure type draft tube designed by the design's method improves hydraulic turbine draft tube internal flow situation, improve hydraulic turbine and recycle the efficiency of residual liquid energy and the stability of unit.
Accompanying drawing explanation
Fig. 1 is the draft tube cross-sectional view of one embodiment of the invention
Fig. 2 is the single line drawing of the draft tube of same embodiment
In figure: 1. throat cone section inlet diameter, 2. throat cone section outlet diameter, 3. throat cone section angle of flare, 4. the draft tube degree of depth, 5. the throat cone section degree of depth, 6. draft tube length, 7. draft tube bending section outlet height, 8. draft tube bending section length, 9. draft tube diffuser section width, 10. draft tube outlet height, 11. draft tube outlet buttress width, 12. draft tube outlet buttress inlet fillet radius.
Embodiment
Fig. 1 and Fig. 2 combination defines the shape of hydraulic turbine installation flexure type draft tube.It can improve hydraulic turbine draft tube internal flow situation, improves hydraulic turbine and recycles the efficiency of residual liquid energy and the stability of unit.The draft tube of hydraulic turbine installation adopts flexure type draft tube, facilitates casting, is beneficial to processing.Draft tube of the present invention is made up of right cone pipeline section, bending section, outlet diffuser, and the liquid flowed out from hydraulic turbine causes power vacuum when tail water Bottomhole pressure, can recovery section kinetic energy.The present invention determines tail throat cone section inlet diameter (1) of mini hydraulic turbine installation by following relation, tail throat cone section outlet diameter (2), throat cone section angle of flare (3), the draft tube degree of depth (4), the throat cone section degree of depth (5), draft tube length (6), draft tube bending section outlet height (7), draft tube bending section length (8), draft tube diffuser section width (9), draft tube outlet height (10), draft tube outlet buttress width (11), draft tube outlet buttress inlet fillet radius (12).
D 3 = ( 1.25 + 0.0835 lg Q n 3 ) D j ;
D 4 = 1.35 1 + 0.7 n s - 0.658 D 3 ;
β = arctan D 4 - D 3 2 ( H - H 1 - D 4 ) ;
H 1 = ( 1 - 0.0689 1 ( n s / 100 ) 1.128 ) D 3 + D 4 2 ;
H = 24.31 k ( n s 100 ) - 0.5 Q n 3 k = 0.9031 e 0.0004 n s ;
L＝(1.65～1.75)H；
h＝0.5(H-H 1)；
l = ( 1 + 3.25 ( n s / 100 ) 1.128 ) D 4 ;
α≤8°：
B＝(0.95～1.02)H；
h s＝h+(L-l)tanα；
b / B = 0.1 ~ 0.15 R = ( 2 ~ 3 ) b ;
Above, that makes with reference to embodiment for patent of the present invention illustrates, but the present invention is not limited to above-described embodiment, also comprises other embodiments in concept of the present invention or variation.

Claims (6)

1. a hydraulic turbine installation flexure type draft tube Hydraulic Design Method, is characterized in that: the geometric parameter right cone pipeline section inlet diameter of hydraulic turbine installation flexure type draft tube structure is applicable to following relation:
In formula, D 3-throat cone section inlet diameter, mm;
Q-hydraulic turbine flow, m 3/ s;
D j-hydraulic turbine outlet diameter, mm;
N-hydraulic turbine rotating speed, r/min.
2. a kind of hydraulic turbine installation flexure type draft tube Hydraulic Design Method as claimed in claim 1, is characterized in that: the geometric parameter right cone pipeline section outlet diameter of hydraulic turbine installation flexure type draft tube structure is applicable to following relation:
In formula, D 4-throat cone section outlet diameter, mm;
D 3-throat cone section inlet diameter, mm;
N s-hydraulic turbine specific speed.
3. a kind of hydraulic turbine installation flexure type draft tube Hydraulic Design Method as claimed in claim 1, is characterized in that: the geometric parameter right cone pipeline section angle of flare of hydraulic turbine installation flexure type draft tube and highly applicable following relation:
In formula, β-throat cone section angle of flare, °;
D 4-throat cone section outlet diameter, mm;
D 3-throat cone section inlet diameter, mm;
The H-draft tube degree of depth, mm;
H 1-throat cone section the degree of depth, mm;
N s-hydraulic turbine specific speed.
4. a kind of hydraulic turbine installation flexure type draft tube Hydraulic Design Method as claimed in claim 1, is characterized in that: the geometric parameter degree of depth and the length of hydraulic turbine installation flexure type draft tube are applicable to following relation:
L＝(1.65～1.75)H
In formula, the H-draft tube degree of depth, mm;
K-draft tube adjusting for depth coefficient, k=0.925 ~ 1;
N s-hydraulic turbine specific speed;
Q-hydraulic turbine flow, m 3/ s;
N-hydraulic turbine rotating speed, r/min;
L-draft tube length, mm.
5. a kind of hydraulic turbine installation flexure type draft tube Hydraulic Design Method as claimed in claim 1, is characterized in that: the geometric parameter bending section length of hydraulic turbine installation flexure type draft tube, outlet height are applicable to following relation:
h＝0.5(H-H 1)
In formula, h-draft tube bending section outlet height, mm;
The H-draft tube degree of depth, mm;
N s-hydraulic turbine specific speed;
H 1-throat cone section the degree of depth, mm;
D 4-throat cone section outlet diameter, mm;
L-draft tube bending section length, mm.
6. a kind of hydraulic turbine installation flexure type draft tube Hydraulic Design Method as claimed in claim 1, is characterized in that: draft tube diffuser adopts the structural type of rectangular cross section, and diffuser upper cover plate and substantially horizontal angle α meet following formula:
α≤8°
Section width B, draft tube outlet height h smeet following relation:
B＝(0.95～1.02)H
h s＝h+(L-l)tanα
Draft tube diffuser adopts single buttress, and buttress is arranged between two parties; Buttress length and the same length of diffusing tube, buttress inlet cavetto, all the other key dimensions meet following relation:
In formula, h-draft tube bending section outlet height, mm;
The H-draft tube degree of depth, mm;
B-draft tube diffuser section width, mm;
L-draft tube length, mm;
L-draft tube bending section length, mm;
H s-draft tube outlet height, mm;
B-draft tube outlet buttress width, mm;
R-draft tube outlet buttress inlet fillet radius, mm.
CN201510679261.5A 2015-10-16 2015-10-16 Hydraulic design method for bent tail water pipe of hydraulic turbine device Pending CN105275711A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510679261.5A CN105275711A (en) 2015-10-16 2015-10-16 Hydraulic design method for bent tail water pipe of hydraulic turbine device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201510679261.5A CN105275711A (en) 2015-10-16 2015-10-16 Hydraulic design method for bent tail water pipe of hydraulic turbine device

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Publication Number Publication Date
CN105275711A true CN105275711A (en) 2016-01-27

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106874542A (en) * 2017-01-04 2017-06-20 滨州东瑞机械有限公司 A kind of hydraulic turbine impeller multi-state multi-objective optimization design of power method
CN107740781A (en) * 2017-09-28 2018-02-27 江苏大学 A kind of single tube vertical long multistage pump water-inlet horn pipe Hydraulic Optimizing Design method

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6166866A (en) * 1984-09-10 1986-04-05 Fuji Electric Co Ltd Draft tube for reaction water turbine
EP1570175B1 (en) * 2002-12-14 2006-07-19 Voith Siemens Hydro Power Generation GmbH & Co. KG Method and device for reducing pressure fluctuations in an induction pipe of a water turbine or water pump or water-pump turbine
JP2007291873A (en) * 2006-04-21 2007-11-08 Toshiba Corp Bent draft pipe for hydraulic machine
CN101158328A (en) * 2007-10-12 2008-04-09 杭州电子科技大学 Novel draft-tube and preparation method thereof
CN202108639U (en) * 2011-06-22 2012-01-11 山东森玛格德节能设备有限公司 Cylindrical and diffusion type tail water device of hydraulic turbine
CN102828884A (en) * 2012-08-03 2012-12-19 清华大学 Jet flow groove structure for inhibiting turbine draft tube cavitation vortex strip
CN102840079A (en) * 2011-06-22 2012-12-26 山东森玛格德节能设备有限公司 Cylindrical diffused tail water device of hydraulic turbine
CN103670882A (en) * 2013-11-21 2014-03-26 南通高盛机械制造有限公司 Tail water pipe
CN103726973A (en) * 2013-12-30 2014-04-16 浙江理工大学 Mixed-flow turbine draft tube improvement method based on energy gradient theory
CN104121138A (en) * 2014-07-28 2014-10-29 清华大学 Water turbine draft tube with vortex restraining function

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6166866A (en) * 1984-09-10 1986-04-05 Fuji Electric Co Ltd Draft tube for reaction water turbine
EP1570175B1 (en) * 2002-12-14 2006-07-19 Voith Siemens Hydro Power Generation GmbH & Co. KG Method and device for reducing pressure fluctuations in an induction pipe of a water turbine or water pump or water-pump turbine
JP2007291873A (en) * 2006-04-21 2007-11-08 Toshiba Corp Bent draft pipe for hydraulic machine
CN101158328A (en) * 2007-10-12 2008-04-09 杭州电子科技大学 Novel draft-tube and preparation method thereof
CN202108639U (en) * 2011-06-22 2012-01-11 山东森玛格德节能设备有限公司 Cylindrical and diffusion type tail water device of hydraulic turbine
CN102840079A (en) * 2011-06-22 2012-12-26 山东森玛格德节能设备有限公司 Cylindrical diffused tail water device of hydraulic turbine
CN102828884A (en) * 2012-08-03 2012-12-19 清华大学 Jet flow groove structure for inhibiting turbine draft tube cavitation vortex strip
CN103670882A (en) * 2013-11-21 2014-03-26 南通高盛机械制造有限公司 Tail water pipe
CN103726973A (en) * 2013-12-30 2014-04-16 浙江理工大学 Mixed-flow turbine draft tube improvement method based on energy gradient theory
CN104121138A (en) * 2014-07-28 2014-10-29 清华大学 Water turbine draft tube with vortex restraining function

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106874542A (en) * 2017-01-04 2017-06-20 滨州东瑞机械有限公司 A kind of hydraulic turbine impeller multi-state multi-objective optimization design of power method
CN106874542B (en) * 2017-01-04 2020-11-13 滨州东瑞机械有限公司 Multi-working-condition multi-target optimization design method for hydraulic turbine impeller
CN107740781A (en) * 2017-09-28 2018-02-27 江苏大学 A kind of single tube vertical long multistage pump water-inlet horn pipe Hydraulic Optimizing Design method

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