CN101012646A - Convex bulkhead gate groove - Google Patents
Convex bulkhead gate groove Download PDFInfo
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- CN101012646A CN101012646A CN 200610098369 CN200610098369A CN101012646A CN 101012646 A CN101012646 A CN 101012646A CN 200610098369 CN200610098369 CN 200610098369 CN 200610098369 A CN200610098369 A CN 200610098369A CN 101012646 A CN101012646 A CN 101012646A
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- gate slot
- gate groove
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Abstract
The invention discloses a convex gate slot of plate gate, comprising flute and convex body on the side wall that is parallel with the main flow direction of water flow. Compared with prior technology, the invention is provided with following merits that (1) the construction is simple; (2) whirlpool cavitation in the gate slot is improved so as to decrease incipient cavitation number to gate slot of plate gate and improve the cavitation of gate slot. In hydraulic and hydroelectric engineering, the gate is the main composing part in emptying and diversion structure and it is vital for safe operation of project directly. The validity of invention has been validated by tests and the structure is simple and easy. Incipient cavitation number to gate slot of plate gate can be decreased efficiently and the cavitation of gate slot is improved. The safety of gate operation is improved.
Description
Technical field
The present invention relates to a kind of convex bulkhead gate groove, be mainly used in the cavitation erosion that prevents and alleviate Hydraulic and Hydro-Power Engineering outlet structure escape works middle plateform gate gate slot.
Technical background
In outlet structure escape works, bulkhgead gate is a kind of common door type, and it has simple in structure, arranges compactly, and the gate pier stress condition is good, and construction, advantage such as easy to maintenance are widely used on the deep hole in flood-relief channel, aqueduct, flood discharging tunnel and the dam of water conservancy project gate dam.But, when high-velocity flow passed through bulkhead gate groove, because current suddenly change on border, gate slot place and the diffusion of current, the current that form whirlpool and downstream in gate slot separated, make near inner and limit wall of gate slot or the base plate cavitation and cavitation erosion takes place, directly influence the safe operation of engineering.
Common gate slot flow cavitation form has divergence type cavitation and swirl type cavitation.Usually adopt the gate slot cavitation inception to count K
iWeigh the Cavitation Characteristics of gate slot.K
iBe worth for a short time, illustrate that the gate slot cavitation performance is good, is not easy to take place cavitation.The factor that influences gate slot cavitation inception number is a lot, and geometric parameter and current parameter two aspects are generally arranged.To satisfy gravity similarity similar with cavitation when experiment condition, and R in the experiment
eEnough big, then can think when current (A) are flowed through gate slot, the cavitation inception number of gate slot only with its breadth depth ratio W/D, wrong distance than Δ/W, ramp slope Δ/X, fillet than R/D with to choose geometric parameter such as angle θ relevant, referring to Fig. 1.
Research and engineering practice show, by adjusting the divergence type cavitation that geometric parameter can improve gate slot to a certain extent, and the whirlpool cavitation in the gate slot groove is a major issue of gate slot cavitation always, in recent years along with the high dam construction constantly develops, the working head of bulkhgead gate constantly increases, and the whirlpool cavitation problem in the bulkhead gate groove is more outstanding.
Summary of the invention
The present invention proposes a kind of new convex bulkhead gate groove, and it can effectively weaken the vertical shaft whirlpool that occurs in the gate slot groove, thereby suppresses and weakening swirl type cavitation, improves the Cavitation Characteristics of gate slot, reduces its cavitation inception number.
The present invention adopts following technical scheme;
A kind of convex bulkhead gate groove comprises groove, in inside grooves, is parallel on the limit wall of current main flow direction convex body is set.
Compared with prior art, the present invention has following advantage:
(1) construction is simple;
(2) improve the interior whirlpool cavitation of gate slot groove, obviously reduce the cavitation inception number of bulkhead gate groove, improve the Cavitation Characteristics of gate slot.
In Hydraulic and Hydro-Power Engineering, gate is the chief component in sluicing and the water diverting structure, and it is directly connected to the safe operation of engineering.The validity of this invention is verification experimental verification, and is simple for structure, can effectively reduce the cavitation inception number of bulkhead gate groove, improves the Cavitation Characteristics of gate slot, improves the safety of gate operation.
Purpose of the present invention, advantage and characteristics will illustrate by the non-limitative illustration of following preferential embodiment and explain that these embodiment only provide as an example with reference to accompanying drawing.
Description of drawings
Fig. 1 is a bulkhead gate groove geometric parameter schematic diagram.
Fig. 2 is the three-view diagram of classic flat-plate gate gate slot, and wherein, view I-I is the sectional view at slice location I place among Fig. 2, and II-II is the sectional view at slice location II place among Fig. 2, and III-III is the sectional view at slice location III place among Fig. 2.
Fig. 3 is a classic flat-plate gate gate slot geometric parameter schematic diagram.
Fig. 4 is the three-view diagram of convex bulkhead gate groove, and wherein, view I-I is the sectional view at slice location I place among Fig. 4, and II-II is the sectional view at slice location II place among Fig. 4, and III-III is the sectional view at slice location III place among Fig. 4.
Fig. 5 is a convex bulkhead gate groove geometric parameter schematic diagram.
Fig. 6 is classic flat-plate gate gate slot fluidised form figure.
Fig. 7 is convex bulkhead gate groove fluidised form figure.
Fig. 8 is certain engineering weir meter hole longitudinal plan.
Fig. 9 is certain engineering weir meter hole plan view.
Figure 10 is a scheme No.1 431.00m water level gate slot cavitation noise spectrogram.
Figure 11 is a scheme No.1 440.00m water level gate slot cavitation noise spectrogram.
Figure 12 is a scheme No.1 444.83m water level gate slot cavitation noise spectrogram.
Figure 13 is a scheme No.1 449.27m water level gate slot cavitation noise spectrogram.
Figure 14 is a scheme No.1 452.00m water level gate slot cavitation noise spectrogram.
Figure 15 is a scheme No.2 431.00m water level gate slot cavitation noise spectrogram.
Figure 16 is a scheme No.2 440.00m water level gate slot cavitation noise spectrogram.
Figure 17 is a scheme No.2 444.83m water level gate slot cavitation noise spectrogram.
Figure 18 is a scheme No.2 449.27m water level gate slot cavitation noise spectrogram.
Figure 19 is a scheme No.2 452.00m water level gate slot cavitation noise spectrogram.
Figure 20 is a scheme No.2 455.00m water level gate slot cavitation noise spectrogram.
Figure 21 is a scheme No.2 458.00m water level gate slot cavitation noise spectrogram.
Figure 22 is a structural representation of the present invention.
The specific embodiment
Embodiment
With reference to Figure 22, a kind of convex bulkhead gate groove, comprise groove 1,, be parallel on the limit wall of current main flow direction convex body 2 is set in inside grooves, convex body is for protruding from rectangular recess inside, the vertical direction chi is in the cylinder convex body much larger than other both direction size, and vertically, the convex body horizontal section area can remain unchanged, vertically, the convex body horizontal section area also can change.Above-mentioned convex body horizontal section is trapezoidal, rectangle, triangle or polygon.The boundary line of convex body horizontal section and flow action is the curve that combines of curve, ellipse and circular arc that circular arc, parabola, elliptic curve, normal distribution curve, parabola and circular arc combine or is other possible shape arbitrarily.
Fig. 2 and Fig. 3 are traditional bulkhead gate groove structural representation.When current (A) are flowed through gate slot,, in groove, form whirlpool because undergo mutation in the border and the intrinsic diffusion of current.When whirlpool center pressure was lower than saturated vapour pressure, cavity appearred in center of vorticity, formed the swirl type cavitation.This invention is set up convex body (seeing Fig. 4 and Fig. 5) in classic flat-plate gate gate slot groove.Convex body can suppress the formation of large scale whirlpool effectively, improves gate slot inside and downstream side wall pressure power state.
Classic flat-plate gate gate slot and convex bulkhead gate groove flow-shape of the present invention are seen Fig. 6 and Fig. 7 respectively.
Below in conjunction with accompanying drawing the present invention is made more detailed explanation:
As shown in Figure 4 and Figure 5, convex gate slot of the present invention, it comprises convex body 1 and rectangular recess.Convex body is to be positioned on the sidewall that rectangular channel is parallel to water (flow) direction specifically, and the vertical direction size is trapezoidal convex body much larger than other both direction sizes, horizontal cross sectional geometry.
Adopt 1: 45 scale model of certain engineering, under identical test conditions, only change the structural shape of gate slot, verified validity of the present invention.
As Fig. 8 and shown in Figure 9, this project overfall dam is that open type is arranged, table hole port size 13.00m * 21.50m (wide * height), crest elevation 452.00m, weir crest elevation 418.50m.Spillwag chute curvilinear coordinate initial point is taken at weir crest O, and the three-arc curve is adopted in the upstream, and the WES curve is adopted in the downstream, and equation is: y=0.034x
1.85, establish flaring gate pier on the lower exit guide-wall.For creating the maintenance condition, before every fan Service gate, be provided with the Emergency Gate groove to Service gate.Emergency Gate is the planar slide pattern, is operated by auto clawing beam by dam crest door machine.
Each feature section pile No. is I-I:0-002.033; II-II:0+002.011; III-III:0+037.043; IV-IV:0+046.278.
Each characteristic level of water of engineering is level of dead water: 431.00m; Normal pool level: 440.00m; Design flood level: 444.83; Check flood level: 449.27.
Scheme No.1 gate slot three-dimensional-structure as shown in Figure 3.Gate slot width W=1665mm, depth D=900mm, breadth depth ratio W/D=1.85, wrong apart from Δ=90mm, downstream ramp gradient Δ/X=1/12, gate slot axis pile No. 0+002.011m.
Scheme No.2 gate slot three-dimensional-structure as shown in Figure 7.Promptly on the gate slot axis of scheme No.1, add height H
1=270mm, L goes to the bottom
1=900mm, the trapezoidal convex body of base angle θ=45 °, vertically height is identical with the gate slot height for it, and other parameters all remain unchanged.
For the Cavitation Characteristics of plan of survey No.1 and scheme No.2 table hole gate slot, in large-scale decompression cabinet, carried out cavitation test research.Under the similar condition of cavitation, adopt the special-purpose water conservancy project cavitation of NoiseA1.0 type Sound Surveillance System to scheme No.1 and scheme No.2 the noise spectrum under principal character water levels at different levels measure, see Figure 10-21.
Usually, when reservoir level lower, as this research when the characteristic level of water 431.00m, structure is in the non-cavitating state, resulting cavitation noise spectrum belongs to the non-cavitating situation, is called background noise, and the resulting cavitation noise of other water levels at different levels is composed background noise comparison therewith, if both sound pressure level SPL differences are the cavitation inception state greater than 6-10dB.The cavitation number that obtains is called the cavitation inception number.Cavitation inception is counted K
iBe calculated as follows:
H in the formula
∞ i, v
∞ iBe respectively the critical pressure and the critical flow velocity that are undisturbed section, H
VmBe water saturation steam pressure under the test water temperature, g is an acceleration of gravity.
Flow cavitation is counted K and is calculated as follows:
H in the formula
∞, v
∞Be respectively prototype and be undisturbed the absolute pressure of section and the mean flow rate of section, H
vBe water saturation steam pressure under the earial drainage condition, if the water intaking temperature is 10 ℃, H
v=0.13m.
To formula (2), be undisturbed section absolute pressure when calculating each side's case generation cavitation inception state according to Figure 10-21 and formula (1), the flow cavitation ordered series of numbers that is undisturbed prototype under the flow velocity of section and corresponding cavitation inception number and each characteristic level of water is in table 1 and table 2.Being undisturbed section in the calculating, to take from pile No. be 0+0.211m.
The flow cavitation of prototype is counted K result of calculation under each characteristic level of water of table 1
| Characteristic level of water H (m) | 431.00 | 440.00 | 444.83 | 449.27 |
| Flow cavitation is counted K | 3.43 | 2.35 | 2.05 | 1.71 |
Two scheme cavitation inceptions of table 2 are counted K
iThe prototype flow cavitation is counted K result of calculation during with 449.27m
| Scheme | H ∞i(m) | H vm(m) | v ∞i(m/s) | Cavitation inception is counted K i | Flow cavitation is counted K |
| No.1 | 0.94 | 0.43 | 2.40 | 1.73 | 1.71 |
| No.2 | 0.98 | 0.43 | 2.67 | 1.51 | 1.71 |
As seen from Table 2, for check flood level 449.27m, the gate slot cavitation inception K of scheme No.2
iLess than scheme No.1, and count K less than flow cavitation.Be that scheme No.2 has better Cavitation Characteristics than scheme No.1, engineering is safer.
Above-mentioned design scheme is an embodiment among the present invention, employing is provided with the gate slot pattern of the trapezoidal convex body that vertically cross sectional shape is constant in gate slot inside, according to the difference of engineering actual conditions, the present invention can also adopt the convex body of other cross sectional shapes and the gate slot pattern of section area and change of shape vertically.
Above-mentioned design scheme adopts convex body and the gate slot pattern of rectangle fillet mistake apart from the slope combination, according to actual demands of engineering, and the gate slot pattern that the present invention can also adopt convex body and rectangle corner gate slot, rectangle fillet gate slot, rectangle mistake to make up apart from slope gate slot etc.
Claims (10)
1. a convex bulkhead gate groove comprises groove (1), it is characterized in that: in inside grooves, be parallel on the limit wall of current main flow direction convex body (2) is set.
2. convex bulkhead gate groove according to claim 1 is characterized in that: the convex body horizontal section is trapezoidal.
3. convex bulkhead gate groove according to claim 1 is characterized in that: the convex body horizontal cross sectional geometry is a rectangle.
4. convex bulkhead gate groove according to claim 1 is characterized in that: the convex body horizontal section is a triangle.
5. convex bulkhead gate groove according to claim 1 is characterized in that: the convex body horizontal section is a polygon.
6. convex bulkhead gate groove according to claim 1 is characterized in that: the boundary line of convex body horizontal section and flow action is a circular arc.
7. convex bulkhead gate groove according to claim 1 is characterized in that: the boundary line of convex body horizontal section and flow action is a parabola.
8. convex bulkhead gate groove according to claim 1 is characterized in that: the boundary line of convex body horizontal section and flow action is an elliptic curve.
9. convex bulkhead gate groove according to claim 1 is characterized in that: the boundary line of convex body horizontal section and flow action is a normal distribution curve.
10. convex bulkhead gate groove according to claim 1 is characterized in that: the boundary line of convex body horizontal section and flow action is the curve that parabola and circular arc combine.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100983696A CN100487200C (en) | 2006-12-15 | 2006-12-15 | Convex bulkhead gate groove |
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|---|---|---|---|
| CNB2006100983696A CN100487200C (en) | 2006-12-15 | 2006-12-15 | Convex bulkhead gate groove |
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| CN101012646A true CN101012646A (en) | 2007-08-08 |
| CN100487200C CN100487200C (en) | 2009-05-13 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102252108A (en) * | 2011-07-15 | 2011-11-23 | 浙江盾安阀门有限公司 | Novel hard seal gate valve |
| CN102607874A (en) * | 2012-04-01 | 2012-07-25 | 中交上海三航科学研究院有限公司 | Test bed for quasi-prototype structure of deepwater port project |
| CN112900373A (en) * | 2021-01-19 | 2021-06-04 | 扬州大学 | Gate slot with transition structure |
| CN112900372A (en) * | 2021-01-19 | 2021-06-04 | 扬州大学 | Gate slot structure for reducing water flow resistance |
-
2006
- 2006-12-15 CN CNB2006100983696A patent/CN100487200C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102252108A (en) * | 2011-07-15 | 2011-11-23 | 浙江盾安阀门有限公司 | Novel hard seal gate valve |
| CN102607874A (en) * | 2012-04-01 | 2012-07-25 | 中交上海三航科学研究院有限公司 | Test bed for quasi-prototype structure of deepwater port project |
| CN102607874B (en) * | 2012-04-01 | 2014-09-24 | 中交上海三航科学研究院有限公司 | Test bed for quasi-prototype structure of deepwater port project |
| CN112900373A (en) * | 2021-01-19 | 2021-06-04 | 扬州大学 | Gate slot with transition structure |
| CN112900372A (en) * | 2021-01-19 | 2021-06-04 | 扬州大学 | Gate slot structure for reducing water flow resistance |
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|---|---|
| CN100487200C (en) | 2009-05-13 |
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