CN203284768U - Novel hydraulic engineering energy dissipater structure - Google Patents

Abstract

The utility model provides a novel hydraulic engineering energy dissipater structure, and relates to a structural style for a hydraulic engineering energy dissipater. A flip bucket is arranged behind a gate pier, wherein the rear end of the flip bucket is connected with a stilling pool, and the tail end of the stilling pool is provided with a baffle sill. The novel hydraulic engineering energy dissipater structure is characterized in that an upstream face of the flip bucket is a slope face, the upper end of the upstream face is bent inwards to form a jet angle, a sill angle alpha 1 is formed between the top end of the upstream face and the horizontal face, an inclined face is arranged on the outer side of the top end of the flip bucket, and a drop sill of a diffused type is formed; a slope is arranged at the tail end of the baffle sill, and an angle alpha 2 is formed between the slope and a base plate of the stilling pool. The novel hydraulic engineering energy dissipater structure has the advantages that the flip bucket is arranged behind the gate pier, the upper end of the upstream face is bent inwards to form the jet angle, the drop sill is of the diffused type, water flows out of a lock chamber and is stirred up through the flip bucket to form a transversely diffused nappe, the water enters a pool nappe through the drop sill of the diffused type to be diffused to the whole fracture surface of the stilling pool, the water enters the stilling pool with smaller unit discharge, submerge hydraulic jump is formed in the pool, and water flow out of the pool is slow, a water surface is stable to be 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, relate to hydraulic engineering energy dissipater's structural shape.

Background technology:

Middle and lower reaches in river are built 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 large, head is relatively low, and these conditions make the flood-discharge energy-dissipating problem become one of governing factor of engineering hinge layout.These class outlet structure escape works have that head is low, discharge per unit width is large, Froude number is low more, tailwater depth and the characteristics such as level of tail water drop luffing is large, can find out also from the operating expenses aspect that in addition energy dissipating erosion control facility has 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:

Problem to be solved in the utility model is exactly that a kind of New Type Energy Dissipator structural shape for low water head, large flow hydraulic engineering flood-discharge energy-dissipating is provided for above deficiency.Its technical scheme is as follows:

It arranges and chooses bank after gate pier, choose the bank rear end and be connected absorption basin, the absorption basin end setting power bank that disappears.Its key technology is that the upstream face of choosing bank is domatic, and the upstream face upper end forms and chooses angle to infolding, 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 forms α ₂Angle.

The beneficial effect that compared with prior art the utlity model has is:

1, arrange and choose bank after gate pier, the upstream face upper end of choosing bank forms and chooses angle to infolding, 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, enters 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 nearly 180 fan-shaped forms of degree, the mid portion overflow is thick than both sides, and flow velocity is also large 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 pond, go out the pond current and be unhurried current, the water surface is steady, with downstream tail water, naturally is connected.

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 absorption basin collide, springs up, aeration, generation horizontal proliferation and shearing, blending, 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 made the velocity flow profile homogenising.Observe through model testing, form complete submerged hydraulic jump in absorption basin, go out the pond current water surface a small amount of Bubble is arranged, under the overflow water layer, backflow is arranged, refluxes and upwards spring up in each hole divergent flow intersection, in springing up process with a large amount of aerations, go out the pond current water surface without falling, fluctuate less, let out under steadily, with downstream tail water, naturally be connected.

3, the Main Function of choosing angle is at discharge hour, makes overflow along cross directional stretch, longitudinal contraction, and current after choosing bank, enter absorption basin with less discharge per unit width and form hydraulic jump.Changed the hydraulic characteristic that enters current in 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 absorption basin the suitable depth of water under each operating mode, play the comprehensive function that low flow velocity is faced in reduction, while avoiding little discharge, trajectory nappe impacts the conjugate condition of absorption basin base plate and satisfied formation submerged hydraulic jump, the eddy structure that pool inner water stream forms is complicated, 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 to a certain extent each hydraulic parameters in absorption basin simultaneously.Its effect of energy dissipation is good, so that downstream rushes what is respond well.

6, in sum, the utility model is for the flood-discharge energy-dissipating problem with characteristics such as low water head, large flow, low Fo Shi number, dark tail water and level of tail water drop luffing are large, provide a kind of and littlely choose angle, fall bank, the form of shallow water pad absorption basin combined energy dissipation, solved preferably the unsettled problem of flow-shape in the energy dissipating of conventional low stream and absorption basin that adopts.

Description of drawings:

Fig. 1 is the utility model structural representation.

The specific embodiment:

Referring to Fig. 1, the utility model is chosen bank 2 in the rear setting of gate pier 1, chooses bank 2 rear ends and is connected absorption basins 5, the absorption basin 5 end settings power bank 7 that disappears.Its key technology is that the upstream face of choosing bank 2 is domatic, and the upstream face upper end forms and chooses angle 3 to infolding, 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 forms α with the angle of absorption basin 5 base plates ₂Angle.

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

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

Claims (3)

1. novel hydraulic engineering energy dissipating construction, arrange and choose bank (2) after gate pier (1), choose bank (2) rear end and be connected absorption basin (5), absorption basin (5) the end setting power bank (7) that disappears, the upstream face that it is characterized in that choosing bank (2) is domatic, the upstream face upper end forms and chooses angle (3) to infolding, 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) form α with the angle of absorption basin (5) base plate ₂Angle.

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

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

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