CN103266584A

CN103266584A - Novel water conservancy project energy dissipater structure

Info

Publication number: CN103266584A
Application number: CN2013102215677A
Authority: CN
Inventors: 胡明; 彭志海; 毛舒娅; 曹辉
Original assignee: Sinohydro Bureau 7 Co Ltd
Current assignee: Sinohydro Bureau 7 Co Ltd
Priority date: 2013-06-05
Filing date: 2013-06-05
Publication date: 2013-08-28
Anticipated expiration: 2033-06-05
Also published as: CN103266584B

Abstract

The invention discloses a novel water conservancy project energy dissipater structure and particularly relates to a structural style of a water conservancy project energy dissipater. According to the novel water conservancy project energy dissipater structure, an upturned bucket is arranged behind a gate pier. The back end of the upturned bucket is connected with an absorption basin. The tail end of the absorption basin is provided with an absorption bucket. The novel water conservancy project energy dissipater structure is characterized in that a upstream face of the upturned bucket is a slope, the upper end of the upstream face is bent inward to form a jet angle, an included angle between the top end of the upstream face and a horizontal face forms a bank angle alpha1, an inclined face is formed on the outer side of the top end of the upturned bucket so that a falling bank in a diffusing shape is formed, the tail end of the absorption bank is provided with a slope, and an included angle between the slope and a base plate of the absorption basin forms an angle alpha2. The novel water conservancy project energy dissipater structure has the advantages that the upturned bucket is arranged behind the gate pier, the upper end of the upstream face is bent inward to form the jet angle, the falling bank in the diffusing shape, water flows out of a gate chamber and is stirred up by the upturned bucket to form a diffused transverse water tongue, the water tongue goes into the basin and is diffused to the whole fracture surface of the absorption basin after going through the falling bank in the diffusing shape, the water flows into the absorption basin with small discharge per unit width, submerged hydraulic jump is formed in the basin, the water flows slowly out of the basin, and the water surface is smooth and steady and is naturally connected with downstream tail water.

Description

A kind of novel hydraulic engineering energy dissipating construction

Technical field:

A kind of novel hydraulic engineering energy dissipating construction relates to hydraulic engineering energy dissipater's structural shape.

Background technology:

Middle and lower reaches in the river are built the power station, often are subjected to the dam site orographic condition, the restriction of flood discharge overcurrent width.The sluice discharge per unit width is big, head is relatively low, and these conditions make the flood-discharge energy-dissipating problem become one of governing factor of engineering hinge layout.Characteristics such as these class outlet structure escape works have that head is low, discharge per unit width is big, Froude number is low more, tailwater depth and level of tail water drop luffing are big, in addition from the operating expenses aspect also as can be seen energy dissipating erosion control facility accounted for sizable ratio.Therefore, the form of outlet structure escape works and reasonable Arrangement just become the important technological problems of a restriction.

Summary of the invention:

The problem to be solved in the present invention is exactly that a kind of novel energy dissipating construction pattern for low water head, big flow hydraulic engineering flood-discharge energy-dissipating is provided at above deficiency.Its technical scheme is as follows:

It arranges behind gate pier and chooses bank, chooses the bank rear end and is connected absorption basin, the terminal power bank that disappears that arranges of absorption basin.Its key technology is that the upstream face of choosing bank is domatic, and the upstream face upper end forms to invagination and chooses the angle, the angle formation bank angle α of upstream face top and horizontal plane ₁, there is an inclined-plane in the outside, top of choosing bank, forms the bank that falls of divergent contour build; The power that disappears bank tail end has a slope, and the angle of slope and absorption basin base plate constitutes α ₂The angle.

Compared with prior art the beneficial effect that has of the present invention is:

1, bank is chosen in setting behind gate pier, the upstream face upper end of choosing bank forms to invagination chooses the angle, falling bank is a kind of divergent contour build, less at discharge, when the downstream tailwater level was low, water flows out lock chamber provoked formation horizontal proliferation overflow through choosing bank, goes into the pond overflow and diffuse to whole absorption basin section after the divergent contour build falls bank, enter absorption basin with less discharge per unit width and form hydraulic jump, be similar to flip trajectory bucket.Observe through experimental study, overflow is the fan-shaped form of nearly 180 degree, the mid portion overflow is thick than both sides, and flow velocity is also big than both sides, and its place of entry is with respect to the close downstream of both sides divergent flow, the non-free trajectory nappe of whole overflow, under the overflow water layer backflow is arranged, form submerged hydraulic jump in the pond, go out the pond current and be unhurried current, the water surface is steady, is connected naturally with downstream tail water.

2, along with the increase of discharge, the level of tail water raises, going out water seal flows through and chooses bank and provoke, spread, produce with current in the absorption basin collide, springs up, aeration, generation horizontal proliferation and shearing, blending have prevented the formation of secondary hydraulic jump in absorption basin, strengthened effect of energy dissipation, make the part mechanical energy of current be converted into heat energy and leave, reduced and the pond flow rate of water flow, and make the velocity flow profile homogenising.Observe through model testing, in absorption basin, form complete submerged hydraulic jump, going out the pond current water surface has a small amount of bubble to separate out, under the overflow water layer backflow is arranged, refluxing upwards springs up in each hole divergent flow intersection, in springing up process with a large amount of aerations, going out the pond current water surface does not have and falls, it is less to fluctuate, and lets out under steadily, is connected naturally with downstream tail water.

3, the main effect of choosing the angle is at discharge hour, makes overflow along cross directional stretch, vertically shrink, and current are gone into absorption basin with less discharge per unit width and formed hydraulic jump after choosing bank.Changed the hydraulic characteristic that enters current in the absorption basin, current enter absorption basin with the fan spray form, make the flow velocity homogenising.

4, the effect of absorption basin is to guarantee to form in the absorption basin under each operating mode the suitable depth of water, play reduce face low flow velocity, trajectory nappe impacts the absorption basin base plate and satisfies the comprehensive function of the conjugate condition that forms submerged hydraulic jump when avoiding little discharge, the whirlpool complex structure that pool inner water stream forms, the collision blending is violent, strengthened effect of energy dissipation, effectively solve the secondary that produces when water flows out absorption basin and fall problem, thereby further alleviated current washing away underwater bed.

5, end arranges the slope power bank that disappears, and can adjust the velocity flow profile of pond current, can change each hydraulic parameters in the absorption basin simultaneously to a certain extent.Its effect of energy dissipation is good, so the downstream is respond well towards what.

6, in sum, the present invention is directed to the flood-discharge energy-dissipating problem of characteristics such as having low water head, big flow, low Fo Shi number, dark tail water and level of tail water drop luffing are big, provide a kind of and choose the angle for a short time, fall bank, the form of shallow water pad absorption basin combined energy dissipation, solved preferably and adopted flow-shape problem of unstable in the energy dissipating of conventional low stream and the absorption basin.

Description of drawings:

Fig. 1 is structural representation of the present invention.

The specific embodiment:

Referring to Fig. 1, the present invention arranges in gate pier 1 back and chooses bank 2, chooses bank 2 rear ends and is connected absorption basin 5, the absorption basin 5 terminal power banks 7 that disappear that arrange.Its key technology is that the upstream face of choosing bank 2 is domatic, and the upstream face upper end forms to invagination and chooses angle 3, the angle formation bank angle α of upstream face top and horizontal plane ₁, there is an inclined-plane in the top outside of choosing bank 2, and what form the divergent contour build falls bank 4; The power that disappears bank 7 tail ends have a slope 6, and slope 6 constitutes α with the angle of absorption basin 5 base plates ₂The angle.

Described α ₁The angle at angle is at 0 °～45 °.Under identical hydrologic condition, high d is littler for bank, bank angle α ₁Bigger, the boundary depth of water required when a certain fluidised form of mixed flow occurring is lower, but the high influence of bank generally should be arranged to low bank greater than Kan Jiao as far as possible, to guarantee to occur high sequence fluidised form, the bank height is that benchmark calculates with the riverbed average height, Kan Jiao can select between 0 °～45 °, and general bank angle should be counted Fr with Fo Laode and is directly proportional, and the Fr value is littler, Kan Jiao is littler, is appropriate but generally should get than the Da Kan angle.

Described α ₂The angle at angle is 30 °～90 °.To adjust the velocity flow profile of pond current.

Claims

1. novel hydraulic engineering energy dissipating construction, choose bank (2) in the setting of gate pier (1) back, choose bank (2) rear end and be connected absorption basin (5), the terminal power bank (7) that disappears that arranges of absorption basin (5), the upstream face that it is characterized in that choosing bank (2) is domatic, the upstream face upper end forms to invagination and chooses angle (3), and the angle of upstream face top and horizontal plane forms bank angle α ₁, there is an inclined-plane in the top outside of choosing bank (2), and what form the divergent contour build falls bank (4); The power that disappears bank (7) tail end has a slope (6), and slope (6) constitute α with the angle of absorption basin (5) base plate ₂The angle.

2. according to the described novel hydraulic engineering energy dissipating construction of claim 1, it is characterized in that α ₁The angle at angle is 0 °～45 °.

3. according to the described novel hydraulic engineering energy dissipating construction of claim 1, it is characterized in that α ₂The angle at angle is 30 °～90 °.