CN115017627B - Stilling basin structure, water delivery system and local resistance coefficient estimation method - Google Patents
Stilling basin structure, water delivery system and local resistance coefficient estimation method Download PDFInfo
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Abstract
The invention relates to a stilling pool structure, a water delivery system and a local resistance coefficient estimation method, wherein the stilling pool structure can effectively diffuse water flow entering a stilling pool by arranging non-equidistant longitudinal rectifying grids, the water flow is uniformly distributed along the transverse direction, the transverse berthing safety of a ship in a lock chamber is ensured, the water delivery system for concentrating water in the lock chamber adopting the stilling pool structure can effectively ensure the structural safety of the water delivery system by arranging a water outlet section of the lock chamber stilling pool and canceling the arrangement of dispersed water outlet branch holes of the lock chamber, the length of a connecting turning section of a valve section gallery and a main gallery section at the bottom of the lock is not reduced, the local resistance coefficient estimation method of the stilling pool structure is provided, the technical blank of the stilling pool local resistance loss estimation for concentrating water in the lock chamber in the design specification of the existing lock water delivery system can be made up, the local resistance coefficient determination of the stilling pool structure can be realized, and the hydraulic calculation of the design scheme of the lock chamber stilling pool water delivery system can be supported.
Description
Technical Field
The invention relates to the technical field of ship lock design, in particular to a stilling pool structure, a water delivery system and a local resistance coefficient estimation method.
Background
With the continuous progress of water transportation development in China, more and more navigation hubs enter the range of ultrahigh water heads. In order to ensure safe and efficient operation of the hub, a combined hub arrangement scheme is provided and becomes one of main schemes for building and expanding the hub, a typical combined arrangement is a series arrangement of a small ship lock, a navigation intermediate channel and a ship lift, wherein the ship lock is used as a part of a navigation building project, and the design requirements of special design scale, limited water delivery system spatial arrangement and high water delivery efficiency exist. The ship lock has the function of dispersing the total water head of the hub, the designed water head is more than 12m, the water delivery efficiency is about 8min, and the dispersed water delivery system is recommended to be selected when the type discrimination coefficient of the water delivery system is 2.3 according to the requirements of the current design specifications of the ship lock water delivery system.
However, taking a 1000-ton ship lock as an example, the effective length of the ship lock in the composite arrangement is limited by the arrangement space, and basically, the 1000-ton design is satisfied to represent safe berthing of the ship, and the effective length of the ship lock with a single ship type length of 63m is 70m, which is far less than the effective length of 180m specified in ship lock water delivery system design specifications. Guarantee water delivery system structure and operation safety, dispersion water delivery system contains inducer, valve corridor section, lock chamber main corridor section, goes out water branch hole section and export section, and the structure is complicated and the corridor overall length is longer, and less effective length can not satisfy complicated water delivery system and arrange the demand, needs urgently to provide a novel water delivery system and arranges the form.
Meanwhile, in the design process of the current ship lock water delivery system, a corridor local resistance coefficient estimation method specified in ship lock water delivery system design specifications is used for determining a water delivery system resistance coefficient and a flow coefficient, and hydraulic calculation of a water delivery system design scheme is completed. However, the local resistance to the effluence of the stilling pool in the lock chamber stilling pool water delivery system provided by the invention has no clear estimation method in the specification. Therefore, it is necessary to provide a method for estimating the water discharge resistance coefficient of the stilling pool.
Disclosure of Invention
In view of the above, the present invention aims to provide a stilling basin structure, a water delivery system and a local resistance coefficient estimation method, so as to solve the defects of the prior art, solve the problem of limited layout length, the problem of excessive longitudinal wave force induced by outflow in the first set of locks, and the problem that no clear estimation method exists in the ship lock water delivery system design specification for the local resistance of stilling basin outflow.
In order to achieve the purpose, one technical scheme provided by the invention is as follows: a stilling pool structure is applied to a water delivery system with a lock chamber for centralized water outlet, and comprises:
the water inlet section of the stilling pool;
at least five stilling pool water inlet section longitudinal rectification grids which are arranged on the stilling pool water inlet section in a non-equidistant mode;
the water outlet section at the top of the stilling pool;
at least three stilling pool top grids which are arranged on the cross section of the water outlet at the top of the stilling pool in a non-equidistant mode are used for eliminating the local water level choking in the middle of the stilling pool in the water outlet process;
the section of the water outlet of the stilling pool is opposite to the section of the water inlet of the stilling pool.
Furthermore, the net distance of the longitudinal rectifying grids on the section of the water inlet of the stilling pool is gradually increased from the center line of the section of the water inlet of the stilling pool to the two ends of the water inlet of the stilling pool, and the section of the water inlet of the stilling pool is divided into stilling pool non-equidistant water inlets which are symmetrically distributed along the center line of the section of the water inlet of the stilling pool and the areas of the six water inlets are gradually increased from the center of the section of the water inlet of the stilling pool to the two sides.
Furthermore, the cross section of the water outlet at the top of the stilling pool is divided into at least three stilling Chi Dingbu non-equidistant water outlets by the grid at the top of the stilling pool, and the net width of the stilling Chi Dingbu non-equidistant water outlets is gradually increased from the middle part to the two ends.
The invention provides another technical scheme which is as follows: a water delivery system with centralized water outlet of lock chambers is positioned in a ship lock, an upper lock head, a lock chamber and a lower lock head are arranged on the ship lock along the water flow direction, and the water delivery system comprises the stilling pool structure, wherein the stilling pool structure is arranged on a lock chamber bottom plate at the 2/3 position of the middle rear part of the lock chamber.
Furthermore, a water delivery system at the head of the upper gate is provided with a water inlet of the water delivery system and a water filling valve of the water delivery system;
the water delivery system at the lock chamber is provided with a long corridor at the lock bottom of the water delivery system;
the water delivery system at the head of the lower lock is provided with a water delivery system drain valve and a water delivery system drain opening.
Furthermore, a lock upstream gate located at the head of the upper lock and a lock downstream gate located at the head of the lower lock are further arranged in the lock.
The invention provides another technical scheme which is as follows: a method for estimating a local resistance coefficient of a stilling pool structure comprises the following steps.
S1, building the stilling pool structure in a water delivery system with a lock chamber for centralized water outlet, and filling water for operation;
s2, measuring the structural size of the stilling pool arranged in the water delivery system, and acquiring the cross-sectional area of the stilling poolw 1 ；
S3, measuring the size of the long corridor at the bottom of the water delivery system arranged by the water delivery system to obtain the sectional area of the long corridor at the bottom of the water delivery systemw 0 ；
S4, calculating the local resistance loss caused by sudden expansion of the cross section by taking the area of the cross section of the stilling pool as a calculated cross sectionξ pB ，The formula is as follows:
ξ pB =（w 1 / w 0 -1） 2 （1）；
s5, measuring the size of the stilling pool structure, including stilling Chi JingchangL p Force eliminating Chi JingkuanB p Height of stilling poolh p Obtaining the volume of the water body in the stilling poolV，The formula is as follows:
V=L p ×B p ×h p （2）
s6, calculating the maximum energy of the water flowE’，The formula is as follows:
E’=V/A 0 （3）
in the formula (I), the compound is shown in the specification,A 0 the value range is 0.09-0.13;
s7, obtaining the design water head difference of the water delivery system through the design parameters of the water delivery systemHTime of completion of water deliveryTWater area of lock chamberC；
S8, setting the opening time of the water filling valve of the water delivery systemt v ，Calculating the maximum energy of water flow in the irrigation process corresponding to the design parameters of the water delivery systemE max The formula is as follows:
when in usek v ≤0.25The method comprises the following steps:E max =313.9CH 2 (1-k v ) 3/[ T(2- k v ) 4] （4a）
when in usek v ＞0.25The method comprises the following steps:E max =9.3CH 2 /{ T [k v (2- k v )] 0.5} （4b）
in the formula (I), the compound is shown in the specification,k v the ratio of the opening time of a water filling valve of a set water delivery system to the completion time of water delivery is expressed by the formulak v =t v /T （5）；
S9, providing local resistance loss corresponding to the energy dissipation effect of the stilling pool with the grids according to the partial energy loss caused by the impact between the mass points of the fluid due to the local deformation of the channel when the fluid flowsξ pe ，The formula is as follows:
ξ pe = E’/ E max +∆ξ pe （6）
in the formulaξ pe The stilling basin is an additional resistance coefficient caused by the stilling basins Chi Dingbu non-equidistant water outlets, when the total area of the non-equidistant water outlets at the top of the stilling basin is 2 times larger than the cross-sectional area of the long gallery at the bottom of the gate of the water delivery system, the stilling basin outflow capacity is considered not to influence the flow coefficient of the water delivery system, and only plays a role in adjusting outflow flow distributionξ pe =0；Otherwise, Δξ pe ≠0，∆ξ pe The cross section shape of the grid bars of the grid at the top of the stilling pool, the total area of non-equidistant water outlets at the top of the pool and the cross section area ratio of the long corridor at the bottom of the water delivery system are in nonlinear correlation, and the additional resistance coefficient is determined through a model test;
s10, combining the novel water delivery system arrangement of the centralized water outlet of the lock chamber, wherein the local resistance loss of the stilling pool structure comprises two parts, the first part is the local resistance loss caused by sudden expansion of the section after the filling water flow enters the stilling pool from the long corridor at the bottom of the water delivery systemξ pB (ii) a The second part is the local resistance loss corresponding to the energy dissipation function of the stilling pool with the gridsξ pe Coefficient of resistance to water discharge from stilling basinξ p The formula is as follows:
ξ p =ξ pB +ξ pe （7）；
s11, calculating the local resistance loss caused by sudden expansion of the cross section in the step 4ξ pB Local drag losses corresponding to dissipation of energy in stilling ponds with gratingsξ pe The local resistance coefficient of the stilling pool structure is calculated by carrying out summation in the formula (7)ξ p 。
The beneficial effects of the invention are:
1. non-equidistant longitudinal rectification grids are arranged on the cross section of a water inlet of the stilling pool, and the net spacing of the grids is gradually increased from the center line of the inlet to the two ends of the cross section of the inlet, so that water flow entering the stilling pool can be effectively diffused and is uniformly distributed along the transverse direction.
2. Non-equidistant water outlets are arranged on the cross section of the water outlet on the top surface of the stilling pool, the clear width of the water outlet is gradually increased from the middle part to the two ends, the local water level in the middle part of the stilling pool is prevented from being blocked up in the water outlet process, and the transverse berthing safety of the ship in the lock chamber is ensured.
3. The water delivery system adopting the sluice chamber centralized water outlet structure has the advantages that the sluice chamber water outlet section is arranged, the arrangement of the sluice chamber dispersed water outlet branch holes is cancelled, the structural safety of the water delivery system can be effectively ensured, and the length of the connecting turning section of the valve section gallery and the main gallery section at the bottom of the sluice is not reduced, so that the burial depth is not required to be reduced.
4. The lock chamber water outlet mode is set as the lock chamber stilling pool concentrated water outlet, the local resistance coefficient caused by dispersed water outlet branch holes can be effectively reduced, the flow coefficient of the water delivery system is increased, and the water delivery efficiency of the water delivery system is greatly improved.
5. By providing the estimation method of the local resistance coefficient of the stilling pool structure, the technical blank of estimating the local resistance loss of the stilling pool for the lock chamber concentrated water outlet in the current ship lock water delivery system design specification can be made up, the determination of the local resistance coefficient of the stilling pool structure is realized, and the hydraulic calculation of the design scheme of the lock chamber stilling pool water delivery system is supported.
Drawings
FIG. 1 is a schematic structural diagram of a stilling pool structure according to the present invention;
FIG. 2 is a schematic layout of a lock chamber centralized water output system employing a stilling basin configuration;
FIG. 3 is a floor plan of a ship lock water delivery system;
FIG. 4 is a sectional elevational view of a ship lock water delivery system 1-1;
FIG. 5 is a cross-sectional view of a ship lock water delivery system 2-2;
FIG. 6 is a cross-sectional view of a ship lock water delivery system 3-3;
FIG. 7 is a schematic view of a schematic diagram of a display devicek v And when =0.67, the water delivery system fills the hydraulic characteristic curve chart.
Wherein, 1, the section of the water inlet of the stilling pool; 2. a vertical rectification grid of the section of the water inlet of the stilling pool; 3. the absorption basin is provided with non-equidistant water inlets; 4. the water outlet section at the top of the stilling pool; 5. the grid at the top of the stilling pool, 6, stilling Chi Dingbu are not equidistant water outlets; 7. the section of the water outlet of the stilling pool; 8. an upper brake head; 9. a lock chamber; 10. a gate head is set; 11. a lock chamber floor; 12. a water inlet of the water delivery system; 13. a water filling valve of the water delivery system; 14. a long corridor at the bottom of the water delivery system; 15. a water delivery system drain valve; 16. a water outlet of the water delivery system; 17. a lock upstream gate, 18, a lock downstream gate; 19. a ship lock.
Detailed Description
For a better understanding of the present invention, reference is made to the following detailed description and accompanying drawings that illustrate the invention.
Example 1
As shown in fig. 1, a stilling basin structure for use in a water delivery system with lock chamber for collecting water, the structure comprises:
the absorption basin water inlet section 1 is used for introducing water in a long gallery 14 at the bottom of a water delivery system gate into the absorption basin;
at least five stilling pool water inlet section longitudinal flow-adjusting grids 2 which are arranged on the stilling pool water inlet section 1 in non-equidistant mode can effectively diffuse water flow entering the stilling pool and are uniformly distributed along the transverse direction.
Specifically, the net distance between the longitudinal rectifying grids 2 on the section of the water inlet of the stilling pool is gradually increased from the center line 1 on the section of the water inlet of the stilling pool to the two ends of the water inlet of the stilling pool, and the section 1 of the water inlet of the stilling pool is divided into two non-equidistant water inlets 3 of the stilling pool, which are symmetrically distributed along the center line 1 on the section of the water inlet of the stilling pool and the areas of the six water inlets are gradually increased from the center of the section 1 of the water inlet of the stilling pool to the two sides of the water inlet of the stilling pool.
The water outlet section 4 at the top of the stilling pool is used for leading water in the stilling pool out of the stilling pool and entering the lock chamber 9.
At least three stilling pool top grids 5 which are arranged on the stilling pool top water outlet section 4 in a non-equidistant mode avoid the local water level in the middle of the stilling pool from being high in a water outlet process, and ensure the transverse berthing safety of the ship in the lock chamber.
Specifically, the grid 5 at the top of the stilling pool divides the water outlet section 4 at the top of the stilling pool into at least three stilling forces Chi Dingbu non-equidistant water outlets 6, and the clear width of the non-equidistant water outlets 6 of the stilling pool Chi Dingbu is gradually increased from the middle part to two ends, so that the choking height of the local water level at the middle part of the stilling pool in the water outlet process is eliminated;
and the stilling pool water outlet section 7 is arranged opposite to the stilling pool water inlet section 1 and is used for leading water out of the stilling pool and then leading the water into the long gallery 14 at the bottom of the water delivery system.
Example 2
As shown in fig. 2, the water delivery system of the lock chamber centralized water outlet is positioned in a ship lock 19, the ship lock 19 is provided with an upper lock head 8, a lock chamber 9 and a lower lock head 10 along the water flow direction, the water delivery system comprises the above-mentioned stilling pool structure, the stilling pool structure is arranged on a lock chamber bottom plate 11 at the 2/3 position of the middle rear part of the lock chamber 9, the arrangement of the lock chamber stilling pool water outlet section and the lock chamber dispersed water outlet branch holes is cancelled, the structural safety of the water delivery system can be effectively ensured, and the requirements on the length of a turning section connected between a valve section gallery and a lock bottom main gallery section and the burial depth are not reduced; the lock chamber water outlet mode is set as the lock chamber stilling pool concentrated water outlet, the local resistance coefficient caused by dispersed water outlet branch holes can be effectively reduced, the flow coefficient of the water delivery system is increased, and the water delivery efficiency of the water delivery system is greatly improved.
Further, a water delivery system positioned at the upper lock head 8 is provided with a water delivery system water inlet 12 and a water delivery system irrigation valve 13;
the water delivery system at the lock chamber 9 is provided with a long corridor 14 at the lock bottom of the water delivery system;
the water delivery system at the lower lock head 10 is provided with a water delivery system drain valve 15 and a water delivery system drain opening 16.
Further, a lock upstream gate 17 located at the upper lock head 8 and a lock downstream gate 18 located at the lower lock head 10 are also provided in the lock 19.
The specific working process comprises the following steps:
step 1, during irrigation, opening an irrigation valve 13 of a water delivery system, enabling water flow to enter a stilling pool structure through the irrigation valve 13 of the water delivery system and a long corridor 14 at the bottom of a lock of the water delivery system from a water inlet 12 of the water delivery system, and then filling the water into a lock chamber to finish ship lock irrigation; five longitudinal rectifying grids 2 of the water inlet section of the stilling pool are arranged at non-equal intervals, the net spacing of the grids is gradually increased from the center line of the inlet to two ends of the inlet section, the water inlet section 1 of the stilling pool is divided into six non-equal-interval water inlets 3 of the stilling pool with different areas, which are symmetrically distributed along the center line of the inlet, the areas of the non-equal-interval water inlets 3 of the stilling pool are gradually increased from the center of the inlet to two sides, so that water flow can be effectively diffused along the transverse direction, the flow entering the stilling pool is transversely and uniformly distributed, the grids 5 at the top of the stilling pool divide the top of the stilling pool into three non-equal-interval water outlets 6 of the stilling pool Chi Dingbu, the net width of the water outlets is gradually increased from the middle part to two ends, the local water level in the stilling pool is prevented from being high in the water outlet process, and the transverse mooring safety of a ship in a lock chamber is ensured;
and 2, when the water draining is operated, opening a water delivery system water draining valve 15, enabling water flow to flow into the stilling pool structure from the lock chamber, enabling the water flow to flow into a long gallery 14 at the bottom of the water delivery system lock from a water outlet section 7 of the stilling pool, and enabling the water flow to a water delivery system water draining opening 16 through the water delivery system water draining valve 15, so that the water draining of the ship lock is completed.
Example 3
A method for estimating a local resistance coefficient of a stilling pool structure comprises the following steps:
s1, building the stilling pool structure in a water delivery system with a lock chamber for centralized water outlet, and filling water for operation;
s2, measuring the structural size of the stilling pool arranged in the water delivery system, and acquiring the cross-sectional area of the stilling poolw 1 ；
S3, measuring the size of the long corridor 14 at the bottom of the water delivery system arranged in the water delivery system, and acquiring the cross-sectional area of the long corridor 14 at the bottom of the water delivery systemw 0 ；
S4, calculating the local resistance loss caused by sudden expansion of the cross section by taking the area of the cross section of the stilling pool as a calculated cross sectionξ pB ，The formula is as follows:
ξ pB =（w 1 / w 0 -1） 2 （1）；
s5, measuring the size of the stilling pool structure, including stilling Chi JingchangL p Force eliminating Chi JingkuanB p Height of stilling poolh p Obtaining the volume of the water body in the stilling poolV，The formula is as follows:
V=L p ×B p ×h p （2）
s6, calculating the maximum energy of the water flow to be consumedE’，The formula is as follows:
E’=V/A 0 （3）
in the formula (I), the compound is shown in the specification,A 0 the value range is 0.09-0.13;
in particular, when the design form of the vertical rectifying grating 2 at the water inlet section of the stilling pool is more complex and the energy dissipation effect is better,A 0 the smaller value is taken:
s7, obtaining the design water head difference of the water delivery system through the design parameters of the water delivery systemHTime of completion of water deliveryTWater area of gate chamberC；
S8, setting the opening time of a water filling valve of a water delivery systemt v Calculating the maximum energy of water flow in the irrigation process corresponding to the design parameters of the water delivery system according to the estimation method of the maximum energy of water flow in irrigation provided by the ship lock water delivery system design specificationsE max The formula is as follows:
when in usek v ≤0.25The method comprises the following steps:E max =313.9CH 2 (1-k v ) 3/[ T(2- k v ) 4] （4a）
when in usek v ＞0.25The method comprises the following steps:E max =9.3CH 2 /{ T [k v (2- k v )] 0.5} （4b）
in the formula (I), the compound is shown in the specification,k v the ratio of the opening time of a water filling valve of a set water delivery system to the completion time of water delivery is expressed by the formulak v =t v /T （5）；
S9, according to the definition of local resistance loss, namely, when the fluid flows, the local deformation of the channel causes the impact between the mass points of the fluid to cause partial energy loss, and the local resistance loss corresponding to the energy dissipation effect of the stilling pool with the grating is providedξ pe ，The formula is as follows:
ξ pe = E’/ E max +∆ξ pe （6）
chinese medicine for treating chronic hepatitisξ pe The additional resistance coefficient caused by the non-equidistant water outlets 6 of the stilling pool Chi Dingbu is considered that the flow capacity of the stilling pool does not influence the flow coefficient of the water delivery system and only plays a role in adjusting the distribution of the outflow rate, when the total area of the non-equidistant water outlets 6 at the top of the stilling pool is 2 times larger than the area of the cross section of the long gallery 14 at the bottom of the water delivery systemξ pe =0; otherwise, Δξ pe ≠0，∆ξ pe The cross section shape of the grid bars of the grid 5 at the top of the stilling pool, the total area of the stilling Chi Dingbu non-equidistant water outlets 6 and the cross section area ratio of the long gallery 14 at the bottom of the water delivery system are in nonlinear correlation, and the additional resistance coefficient is determined through a model test;
s10, combining the novel water delivery system arrangement of the lock chamber centralized water outlet, the local resistance loss of the stilling pool structure comprises two parts, wherein the first part is the local resistance loss caused by sudden expansion of the section after the filling water flow enters the stilling pool from the long gallery 14 at the bottom of the water delivery systemξ pB (ii) a The second part is the local resistance loss corresponding to the energy dissipation function of the stilling pool with the gridsξ pe Coefficient of resistance to water discharge of stilling poolξ p The formula is as follows:
ξ p =ξ pB +ξ pe （7）；
s11, calculating the local resistance loss caused by the sudden expansion of the cross section in the S4ξ pB Local drag losses corresponding to dissipation of energy in stilling ponds with gratingsξ pe The local resistance coefficient of the stilling pool structure is calculated by carrying out summation in the formula (7)ξ p 。
Examples of the experiments
Referring to fig. 3 to 6, for example, in a ship lock project, in order to overcome a water level drop of 76m, a composite arrangement of a navigation building is adopted, namely a small ship lock, a navigation intermediate channel and a ship lift are arranged in series, wherein the effective dimension of the ship lock is 70 × 23 × 4.5m (length × width × sill water depth), a design water head is 11.5m, and a design water delivery completion time is 9min. In order to meet the design requirements of special design scale, limited spatial arrangement of a water delivery system and high water delivery efficiency of the ship lock, the water delivery system with the lock chambers for centralized water outlet in the embodiment 2 is adopted, and the water outlet section adopts the stilling pool structure in the embodiment 1. Meanwhile, hydraulic calculation is carried out for matching with a water delivery system design, wherein the local resistance coefficient of the stilling pool is calculated by adopting the estimation method of the local resistance coefficient of the stilling pool structure in the embodiment 3, as shown in table 1.
TABLE 1 local resistance coefficient calculation table for stilling pool structure
The local resistance coefficient and the on-way resistance coefficient of other parts of the water delivery system (irrigation) after conversion are shown in the table 2.
TABLE 2 resistance coefficient and flow coefficient of water delivery system (irrigation system part)
As shown in fig. 7, the hydraulic characteristics of the water delivery system were calculated according to the design specifications of ship lock water delivery system based on the data shown in tables 1 and 2.
While one embodiment of the present invention has been described in detail, the present invention is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (5)
1. A stilling pool structure is characterized in that the structure is applied to a water delivery system with a lock chamber for collecting outlet water, and comprises:
a water inlet section (1) of the stilling pool;
at least five stilling pool water inlet section longitudinal rectification grids (2) which are arranged on the stilling pool water inlet section (1) in a non-equidistant mode;
a water outlet section (4) at the top of the stilling pool;
at least three stilling pool top grids (5) which are arranged on a water outlet section (4) at the top of the stilling pool in a non-equidistant mode are used for eliminating the choking of the local water level in the middle of the stilling pool in the water outlet process;
the stilling pool water outlet section (7) is arranged opposite to the stilling pool water inlet section (1);
the net distance of the longitudinal rectifying grating (2) on the section of the water inlet of the stilling pool is gradually increased from the central line of the section (1) of the water inlet of the stilling pool to the two ends of the longitudinal rectifying grating, and the section (1) of the water inlet of the stilling pool is divided into six non-equidistant water inlets (3) of the stilling pool, which are symmetrically distributed along the central line of the section (1) of the water inlet of the stilling pool and have the areas gradually increased from the center of the section (1) of the water inlet of the stilling pool to the two sides;
the grid (5) at the top of the stilling pool divides the water outlet section (4) at the top of the stilling pool into at least three stilling Chi Dingbu non-equidistant water outlets (6), and the net width of the stilling Chi Dingbu non-equidistant water outlets (6) is gradually increased from the middle part to two ends.
2. A water transfer system with lock chamber for concentrated water discharge, which water transfer system is located in a ship lock (19), said ship lock (19) being provided with an upper lock bow (8), a lock chamber (9) and a lower lock bow (10) in the direction of the water flow, characterized in that it comprises a stilling basin structure as claimed in claim 1, said stilling basin structure being arranged on the lock chamber floor (11) at the rear 2/3 of the lock chamber (9).
3. A lock chamber centralized water outlet water delivery system as claimed in claim 2, characterized in that the water delivery system at the upper lock head (8) is provided with a water delivery system water inlet (12) and a water delivery system water filling valve (13);
the water delivery system positioned at the lock chamber (9) is provided with a long corridor (14) at the lock bottom of the water delivery system;
the water delivery system positioned at the lower brake head (10) is provided with a water delivery system drain valve (15) and a water delivery system drain opening (16).
4. A lock chamber concentrated water delivery system according to claim 2, wherein the lock (19) is further provided with an upstream lock gate (17) at the upper lock bow (8) and a downstream lock gate (18) at the lower lock bow (10).
5. A method for estimating a local resistance coefficient of a stilling pool structure is characterized by comprising the following steps:
s1, building the stilling pool structure of claim 1 in a water delivery system with centralized water outlet of a lock chamber, and filling water for operation;
s2, measuring the structural size of the stilling pool arranged in the water delivery system, and acquiring the area of the section of the stilling poolw 1 ；
S3, measuring the size of the long corridor (14) at the bottom of the water delivery system gate arranged in the water delivery system, and acquiring the section area of the long corridor (14) at the bottom of the water delivery system gatew 0 ；
S4, calculating the local resistance loss caused by sudden expansion of the cross section by taking the area of the cross section of the stilling pool as a calculated cross sectionξ pB ，The formula is as follows:
ξ pB =（w 1 / w 0 -1） 2 （1）；
s5, measuring the size of the stilling pool structure, including stilling Chi JingchangL p Force eliminating Chi JingkuanB p Height of stilling poolh p Obtaining the volume of the water body in the stilling poolV，The formula is as follows:
V=L p ×B p ×h p （2）
s6, calculating the maximum energy of the water flow to be consumedE’，The formula is as follows:
E’=V/A 0 （3）
in the formula (I), the compound is shown in the specification,A 0 is a coefficient, and the value range is 0.09-0.13；
S7, obtaining the design water head difference of the water delivery system through the design parameters of the water delivery systemHTime of completion of water deliveryTWater area of gate chamberC；
S8, setting the opening time of the water filling valve of the water delivery systemt v ，Calculating the maximum energy of water flow in the irrigation process corresponding to the design parameters of the water delivery systemE max The formula is as follows:
when in usek v ≤0.25The method comprises the following steps:E max =313.9CH 2 (1-k v ) 3/[ T(2- k v ) 4] （4a）
when in usek v ＞0.25The method comprises the following steps:E max =9.3CH 2 /{ T [k v (2- k v )] 0.5} （4b）
in the formula (I), the compound is shown in the specification,k v the ratio of the opening time of a water filling valve of a set water delivery system to the completion time of water delivery is expressed by the formulak v =t v / T （5）；
S9, providing local resistance loss corresponding to the energy dissipation effect of the stilling pool with the grids according to the partial energy loss caused by the impact between the mass points of the fluid due to the local deformation of the channel when the fluid flowsξ pe ，The formula is as follows:
ξ pe = E’/ E max +∆ξ pe （6）
in the formulaξ pe The additional resistance coefficient caused by the stilling force Chi Dingbu non-equidistant water outlets (6) plays a role in adjusting the outflow flow distribution when the total area of the non-equidistant water outlets (6) at the top of the stilling pool is 2 times larger than the cross-sectional area of the long gallery (14) at the bottom of the water delivery system, and the Δξ pe =0; otherwise, Δξ pe ≠0，∆ξ pe And the top grid of stilling pool (5) The cross section shape of the grid, the total area of the non-equidistant water outlets (6) at the top of the pool and the cross section area ratio of the long gallery (14) at the bottom of the water delivery system are in nonlinear correlation, and the additional resistance coefficient is determined through a model test;
s10, combining the novel water delivery system arrangement of the lock chamber centralized water outlet, the local resistance loss of the stilling pool structure comprises two parts, wherein the first part is the local resistance loss caused by sudden expansion of the section after the filling water flow enters the stilling pool from the long gallery (14) at the bottom of the water delivery systemξ pB (ii) a The second part is the local resistance loss corresponding to the energy dissipation function of the stilling pool with the gridsξ pe Coefficient of resistance to water discharge of stilling poolξ p The formula is as follows:
ξ p =ξ pB +ξ pe （7）；
s11, calculating the local resistance loss caused by sudden expansion of the cross section in the step 4ξ pB Local drag losses corresponding to dissipation of energy in stilling ponds with gratingsξ pe The local resistance coefficient of the stilling pool structure is calculated by carrying out summation in the formula (7)ξ p 。
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| CN103806425A (en) * | 2014-03-12 | 2014-05-21 | 长江水利委员会长江科学院 | Dispersed water delivery system for high-water-head ship lock |
| CN106677150A (en) * | 2017-02-07 | 2017-05-17 | 中国电建集团华东勘测设计研究院有限公司 | Under-sill water delivery energy dissipation structure and construction method thereof |
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| CN101525876B (en) * | 2009-04-02 | 2011-02-02 | 水利部交通运输部国家能源局南京水利科学研究院 | Ship lock concentration and dispersion delivery system without calm section |
| CN204456047U (en) * | 2015-01-06 | 2015-07-08 | 中国电建集团华东勘测设计研究院有限公司 | A kind of water-carriage system with base plate gallery road, middle energy dissipating room |
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| CN103806425A (en) * | 2014-03-12 | 2014-05-21 | 长江水利委员会长江科学院 | Dispersed water delivery system for high-water-head ship lock |
| CN106677150A (en) * | 2017-02-07 | 2017-05-17 | 中国电建集团华东勘测设计研究院有限公司 | Under-sill water delivery energy dissipation structure and construction method thereof |
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