CA3067651A1 - Method for improving inlet flow pattern of multihole inflow pump station - Google Patents
Method for improving inlet flow pattern of multihole inflow pump stationInfo
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- CA3067651A1 CA3067651A1 CA3067651A CA3067651A CA3067651A1 CA 3067651 A1 CA3067651 A1 CA 3067651A1 CA 3067651 A CA3067651 A CA 3067651A CA 3067651 A CA3067651 A CA 3067651A CA 3067651 A1 CA3067651 A1 CA 3067651A1
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- pump station
- pier
- beams
- partitioning
- forebay
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/22—Adaptations of pumping plants for lifting sewage
Abstract
The invention discloses a method for improving an inlet flow pattern of a multihole inflow pump station. An inlet box culvert is provided at an inlet end of a pump station forebay, and a combined rectifying device is provided in the pump station forebay. The combined rectifying device comprises a partitioning pier, beams and a flow directing plate. The partitioning pier is disposed along the center line of the pump station forebay; the beams are provided along the height direction of the partitioning pier and are close to the front end of the partitioning pier; the flow directing plate is connected to the side walls of the pump station forebay at both ends in the width direction of the pump station forebay.
Description
METHOD FOR IMPROVING INLET FLOW PATTERN OF MULTIHOLE
INFLOW PUMP STATION
BACKGROUND OF THE INVENTION
Field of the Invention The present invention relates to the field of municipal drainage of hydraulic engineering, and specifically, to a method for improving an inlet flow pattern of a multihole inflow pump station.
Description of Related Art As an important infrastructure in an urban drainage system, a drainage pump station is mainly responsible for urban flood control and drainage and is of important significance for efficient use of urban water resources, ensuring urban water safety, improving an urban water environment, and accelerating new urbanization construction in China. Limited by conditions such as urban planning, terrain, and a scale, an urban drainage pump station has a relatively small floor area, and a structure of a water inlet building is relatively compact. It is often difficult to perform arrangement in accordance with requirements in a good hydraulic condition according to conventional pump station design standards. Particularly, when a multihole inlet box culvert inflow form is adopted, adverse flow phenomena, such as a lateral flow, a high surface flow velocity, and a surface suction vortex, are likely to exist in a pump station forebay.
It is difficult to ensure that a pump unit has a good inflow condition, and consequently, safe and stable operation of the pump station is seriously affected.
SUMMARY OF THE INVENTION
Technical Problem An objective of the present invention is to provide a method for improving an inlet flow pattern of a multihole inflow pump station with regard to the foregoing problems.
Technical Solution To achieve the objective of the present invention, the following technical solutions are used:
A method for improving an inlet flow pattern of a multihole inflow pump station is provided. A combined rectifying device is disposed in a pump station forebay. The combined rectifying device includes a partitioning pier, beams, and a flow directing plate. The pump station forebay has a length of L and a width of W, a water inlet of the pump station forebay has a length less than the overall length L of the pump station forebay, the water inlet of the pump station forebay is in a shape of a flare toward an interior of the pump station forebay, which has an expansion section, and a length of the expansion section of the inlet of the forebay is L1=(0.4 to 0.7)L. An excessively large L I is not conducive to adjusting an inflow condition of a pump, an excessively small Li leads to an excessively large expansion angle, and 0.4 to 0.7 times the length of the pump station forebay is an optimal range obtained by the applicant through several experiments, so that not only the expansion angle can be conveniently controlled, but also an inflow condition of the pump can be easily adjusted.
An angle between a side wall of the expansion section and a central line of the pump station forebay is 13=0 to 25 . It is proved by the applicant through a plurality of experiments that an excessively large angle f3 is likely to cause a relatively large backflow on two sides of the forebay, which is not beneficial for the inflow of the pump station. The maximum operating level of the pump station forebay is HO from the bottom thereof.
The partitioning pier is disposed along a central line of the pump station forebay and is parallel to a main flow direction, a length L2 of the partitioning pier satisfies that L2=0.5L+tan(13/3)L, and a width D of the partitioning pier is the same as a width of a middle division pier between pump units. A length range and a width range of the partitioning pier are optimal ranges obtained by the applicant through several experiments. An excessively large width of the partitioning pier is likely to cause a relatively small overflow area of the forebay, and an excessively small width is unlikely to satisfy use requirements for structural strength. A height of the partitioning pier is H=(1.0 to 1.1)HO. The top of the partitioning pier is flush with or is slightly higher than the maximum operating level of the pump station forebay, so as to save manufacturing costs while ensuring its function. The front end of the partitioning pier is rounded to reduce an impact loss of a water flow. A distance L3 between the front end of the
INFLOW PUMP STATION
BACKGROUND OF THE INVENTION
Field of the Invention The present invention relates to the field of municipal drainage of hydraulic engineering, and specifically, to a method for improving an inlet flow pattern of a multihole inflow pump station.
Description of Related Art As an important infrastructure in an urban drainage system, a drainage pump station is mainly responsible for urban flood control and drainage and is of important significance for efficient use of urban water resources, ensuring urban water safety, improving an urban water environment, and accelerating new urbanization construction in China. Limited by conditions such as urban planning, terrain, and a scale, an urban drainage pump station has a relatively small floor area, and a structure of a water inlet building is relatively compact. It is often difficult to perform arrangement in accordance with requirements in a good hydraulic condition according to conventional pump station design standards. Particularly, when a multihole inlet box culvert inflow form is adopted, adverse flow phenomena, such as a lateral flow, a high surface flow velocity, and a surface suction vortex, are likely to exist in a pump station forebay.
It is difficult to ensure that a pump unit has a good inflow condition, and consequently, safe and stable operation of the pump station is seriously affected.
SUMMARY OF THE INVENTION
Technical Problem An objective of the present invention is to provide a method for improving an inlet flow pattern of a multihole inflow pump station with regard to the foregoing problems.
Technical Solution To achieve the objective of the present invention, the following technical solutions are used:
A method for improving an inlet flow pattern of a multihole inflow pump station is provided. A combined rectifying device is disposed in a pump station forebay. The combined rectifying device includes a partitioning pier, beams, and a flow directing plate. The pump station forebay has a length of L and a width of W, a water inlet of the pump station forebay has a length less than the overall length L of the pump station forebay, the water inlet of the pump station forebay is in a shape of a flare toward an interior of the pump station forebay, which has an expansion section, and a length of the expansion section of the inlet of the forebay is L1=(0.4 to 0.7)L. An excessively large L I is not conducive to adjusting an inflow condition of a pump, an excessively small Li leads to an excessively large expansion angle, and 0.4 to 0.7 times the length of the pump station forebay is an optimal range obtained by the applicant through several experiments, so that not only the expansion angle can be conveniently controlled, but also an inflow condition of the pump can be easily adjusted.
An angle between a side wall of the expansion section and a central line of the pump station forebay is 13=0 to 25 . It is proved by the applicant through a plurality of experiments that an excessively large angle f3 is likely to cause a relatively large backflow on two sides of the forebay, which is not beneficial for the inflow of the pump station. The maximum operating level of the pump station forebay is HO from the bottom thereof.
The partitioning pier is disposed along a central line of the pump station forebay and is parallel to a main flow direction, a length L2 of the partitioning pier satisfies that L2=0.5L+tan(13/3)L, and a width D of the partitioning pier is the same as a width of a middle division pier between pump units. A length range and a width range of the partitioning pier are optimal ranges obtained by the applicant through several experiments. An excessively large width of the partitioning pier is likely to cause a relatively small overflow area of the forebay, and an excessively small width is unlikely to satisfy use requirements for structural strength. A height of the partitioning pier is H=(1.0 to 1.1)HO. The top of the partitioning pier is flush with or is slightly higher than the maximum operating level of the pump station forebay, so as to save manufacturing costs while ensuring its function. The front end of the partitioning pier is rounded to reduce an impact loss of a water flow. A distance L3 between the front end of the
2 partitioning pier and an inlet side of the forebay satisfies that L=L2+L3, and the rear end of the partitioning pier is connected to a middle division pier on a central line in the width direction of the pump station forebay, with central lines of the two overlapping each other.
The beams are distributed along the height direction of the partitioning pier.
A
number of the beams ranges from 2 to 5. A relatively small number is not conducive to adjusting a flow pattern of a water flow, and a relatively large number causes an excessively large local hydraulic loss. The beams are close to the front end of the partitioning pier, and a spacing between the beams and the front end of the partitioning pier is L4=(0 to 0.05)L. An excessively large spacing between the two affects a flow rectifying effect of a combined beam. Each of the beams is connected to side walls of the pump station forebay at two ends in the width direction of the pump station forebay, so as to produce a flow rectifying effect on the whole forebay. A width of the beam is B1=(0.01 to 0.04)L, so that a material is saved as much as possible while ensuring the structural strength of the beam. The topmost end of the beam is flush with the top of the partitioning pier, and a height of each beam is H1=(0.1 to 0.3)HO. If the height is too small, the rectifying effect on a water flow is poor, and if the height is too large, an overflow cross-sectional area of the forebay is reduced. In addition, a vertical distance between two adjacent beams is H2=(0.05 to 0.15)H0, to produce a better rectifying effect.
The flow directing plate is a folded plate as a whole. The flow directing plate is connected to the side walls of the pump station forebay at two ends in the width direction of the pump station forebay. A thickness of the flow directing plate is B2=(0.005 to 0.03)L. If the thickness is too large, the flow directing plate occupies an excessive front pool volume. If the thickness is too small, the flow directing plate may have insufficient structural strength. The flow directing plate includes a vertical plate and an inclined plate. The vertical plate is closely placed against the front end of the middle division pier and is perpendicular to the bottom face of the pump station forebay, and a height of the vertical plate is H3=(0.4 to 0.7)H0. One end of the inclined plate of the flow directing plate is connected to the bottom end of the vertical plate, the other end of the inclined plate is connected to an inlet end of the pump, and an angle between the inclined plate and the horizontal plane is 0=25 to 45 , so as to ensure that the water flow is well transitioned to the inlet of the water pump.
The beams are distributed along the height direction of the partitioning pier.
A
number of the beams ranges from 2 to 5. A relatively small number is not conducive to adjusting a flow pattern of a water flow, and a relatively large number causes an excessively large local hydraulic loss. The beams are close to the front end of the partitioning pier, and a spacing between the beams and the front end of the partitioning pier is L4=(0 to 0.05)L. An excessively large spacing between the two affects a flow rectifying effect of a combined beam. Each of the beams is connected to side walls of the pump station forebay at two ends in the width direction of the pump station forebay, so as to produce a flow rectifying effect on the whole forebay. A width of the beam is B1=(0.01 to 0.04)L, so that a material is saved as much as possible while ensuring the structural strength of the beam. The topmost end of the beam is flush with the top of the partitioning pier, and a height of each beam is H1=(0.1 to 0.3)HO. If the height is too small, the rectifying effect on a water flow is poor, and if the height is too large, an overflow cross-sectional area of the forebay is reduced. In addition, a vertical distance between two adjacent beams is H2=(0.05 to 0.15)H0, to produce a better rectifying effect.
The flow directing plate is a folded plate as a whole. The flow directing plate is connected to the side walls of the pump station forebay at two ends in the width direction of the pump station forebay. A thickness of the flow directing plate is B2=(0.005 to 0.03)L. If the thickness is too large, the flow directing plate occupies an excessive front pool volume. If the thickness is too small, the flow directing plate may have insufficient structural strength. The flow directing plate includes a vertical plate and an inclined plate. The vertical plate is closely placed against the front end of the middle division pier and is perpendicular to the bottom face of the pump station forebay, and a height of the vertical plate is H3=(0.4 to 0.7)H0. One end of the inclined plate of the flow directing plate is connected to the bottom end of the vertical plate, the other end of the inclined plate is connected to an inlet end of the pump, and an angle between the inclined plate and the horizontal plane is 0=25 to 45 , so as to ensure that the water flow is well transitioned to the inlet of the water pump.
3 Preferably, the partitioning pier, the combined beam, and the flow directing plate of the present invention are metal structures or reinforced concrete structures, to ensure that the rectifying device can meet design, construction, and use requirements of the drainage pump station.
In a preferable embodiment, the pump station forebay has a length L of 8.5 m and a width W of 18.3 m, the expansion section of the water inlet of the pump station forebay has a length Li of 5.3 m, an angle between a side wall of the expansion section and a central line of the pump station forebay is 13=24 , and the maximum operating level HO of the pump station forebay is 5.2 m. The partitioning pier has a length L2 of 5.45 m, a width D of 0.3 m, and a height H of 5.2 m, and a distance L3 between the front end of the partitioning pier and the water inlet of the forebay is 3.05 m. There are three beams, a spacing L4 between the beams and the front end of the partitioning pier is 0.4 m, a width B1 of a single beam is 0.3 m, a height HI of the single beam is 0.8 m, and a vertical distance H2 between two adjacent beams is 0.3 m. A thickness B2 of the flow directing plate is 0.2 m, a height H3 of the vertical plate of the flow directing plate is 3 m, and an angle 0 between the inclined plate of the flow directing plate and the horizontal plane is 300.
In another preferable embodiment, the pump station forebay has a length L of 8.5 m and a width W of 18.3 m, the expansion section of the water inlet of the pump station forebay has a length Li of 3.4 m, an angle between a side wall of the expansion section and a central line of the pump station forebay is 11=24 , and the maximum operating level HO of the pump station forebay is 5.2 m. The partitioning pier has a length L2 of 5.5 m, a width D of 0.3 m, and a height H of 5.46 m. A distance L3 between the front end of the partitioning pier and the water inlet of the forebay is 3 m. There are five beams, and a spacing L4 between the beams and the front end of the partitioning pier is 0.425 m. A width Bl of a single beam is 0.085 m, a height HI of the single beam is 0.52 m, and a vertical distance H2 between two adjacent beams is 0.26 m. A
thickness B2 of the flow directing plate is 0.255 m; and a height H3 of the vertical plate of the flow directing plate is 3.64 m, and an angle 0 between the inclined plate of the flow directing plate and the horizontal plane is 25 .
In another preferable embodiment, the pump station forebay has a length L of 8.5 m and a width W of 18.3 m, the expansion section of the water inlet of the pump station forebay has a length Li of 5.95 m, an angle 13 between a side wall of the expansion
In a preferable embodiment, the pump station forebay has a length L of 8.5 m and a width W of 18.3 m, the expansion section of the water inlet of the pump station forebay has a length Li of 5.3 m, an angle between a side wall of the expansion section and a central line of the pump station forebay is 13=24 , and the maximum operating level HO of the pump station forebay is 5.2 m. The partitioning pier has a length L2 of 5.45 m, a width D of 0.3 m, and a height H of 5.2 m, and a distance L3 between the front end of the partitioning pier and the water inlet of the forebay is 3.05 m. There are three beams, a spacing L4 between the beams and the front end of the partitioning pier is 0.4 m, a width B1 of a single beam is 0.3 m, a height HI of the single beam is 0.8 m, and a vertical distance H2 between two adjacent beams is 0.3 m. A thickness B2 of the flow directing plate is 0.2 m, a height H3 of the vertical plate of the flow directing plate is 3 m, and an angle 0 between the inclined plate of the flow directing plate and the horizontal plane is 300.
In another preferable embodiment, the pump station forebay has a length L of 8.5 m and a width W of 18.3 m, the expansion section of the water inlet of the pump station forebay has a length Li of 3.4 m, an angle between a side wall of the expansion section and a central line of the pump station forebay is 11=24 , and the maximum operating level HO of the pump station forebay is 5.2 m. The partitioning pier has a length L2 of 5.5 m, a width D of 0.3 m, and a height H of 5.46 m. A distance L3 between the front end of the partitioning pier and the water inlet of the forebay is 3 m. There are five beams, and a spacing L4 between the beams and the front end of the partitioning pier is 0.425 m. A width Bl of a single beam is 0.085 m, a height HI of the single beam is 0.52 m, and a vertical distance H2 between two adjacent beams is 0.26 m. A
thickness B2 of the flow directing plate is 0.255 m; and a height H3 of the vertical plate of the flow directing plate is 3.64 m, and an angle 0 between the inclined plate of the flow directing plate and the horizontal plane is 25 .
In another preferable embodiment, the pump station forebay has a length L of 8.5 m and a width W of 18.3 m, the expansion section of the water inlet of the pump station forebay has a length Li of 5.95 m, an angle 13 between a side wall of the expansion
4 section and a central line of the pump station forebay is 00, and the maximum operating level HO of the pump station forebay is 5.2 m. The partitioning pier has a length L2 of 4.25 m, a width D of 0.3 m, and a height H of 5.72 m. A distance L3 between the front end of the partitioning pier and the water inlet of the forebay is 4.25 m.
There are two beams, and the beams are flush with the front end of the partitioning pier. A
width B1 of a single beam is 0.34 m, a height HI of the single beam is 1.56 m, and a vertical distance H2 between two adjacent beams is 0.78 m. A thickness B2 of the flow directing plate is 0.0425 m; and a height H3 of the vertical plate of the flow directing plate is 2.08 m, and an angle 0 between the inclined plate of the flow directing plate and the horizontal plane is 45 .
Advantageous Effects Advantageous effects of the present invention are as follows:
In the method for improving an inlet flow pattern of a multihole inflow pump station of the present invention, a combined rectifying device is used to suppress lateral flow in the pump station forebay, reduce the surface flow velocity of the forebay, and increase the bottom flow velocity of the forebay, thereby effectively preventing generation of a surface suction vortex and ensure that the pump has a good inflow condition, which is of significance in ensuring safe, stable, and efficient operation of the pump station.
The combined rectifying device provided by the present invention has a simple structure and can be easily manufactured, and is particularly suitable for popularization and application in construction and transformation of municipal drainage pump station engineering in a multihole inflow form.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG.1 is a schematic diagram of an elevation arrangement of the present invention.
FIG.2 is a schematic diagram of planar structural dimensions according to an embodiment of the present invention.
FIG.3 is a schematic diagram of structural dimensions of an elevation of a rectifying device according to an embodiment of the present invention.
FIG.4 is a comparison diagram of flow rate distribution of inlet cross-sections of pumps before and after rectification according to an embodiment of the present invention, where FIG.4a is a comparison diagram of flow rate distribution of inlet cross-sections of pumps before rectification, FIG.4b is a comparison diagram of flow rate distribution of inlet cross-sections of pumps after rectification in Embodiment 1; and FIG.4c is a comparison diagram of flow rate distribution of inlet cross-sections of pumps after rectification in Embodiment 2; FIG.4d is a comparison diagram of flow rate distribution of inlet cross-sections of pumps after rectification in Embodiment 3.
DETAILED DESCRIPTION OF THE INVENTION
The present invention is further described below with reference to the accompanying drawings and embodiments.
As shown in FIG.! to FIG.3, the present invention relates to technical features such as a partitioning pier 1, beams 2, a flow directing plate 3, a forebay 4, an inlet box culvert 5, a pump unit 6, and a middle division pier 7.
In a method for improving an inlet flow pattern of a multihole inflow pump station, an inlet box culvert is disposed at an inlet end of a pump station forebay, a combined rectifying device is disposed in the pump station forebay, the pump station forebay has an overall length of L and a width of W, a water inlet of the pump station forebay has a length less than the overall length L of the pump station forebay, the water inlet of the pump station forebay is in a shape of a flare toward an interior of the pump station forebay, which has an expansion section, a length of the expansion section is L1=(0.4 to 0.7)L, an angle between a side wall of the expansion section and a central line of the pump station forebay is p=o to 250, and the maximum operating level of the pump station forebay is HO.
The combined rectifying device includes a partitioning pier, beams, and a flow directing plate. The partitioning pier 1 is disposed along a central line of the pump station forebay 4, and is parallel to a main flow direction of the inlet box culvert, a length of the partitioning pier 1 is L2=0.5L+tan(13/3)L, a width of the partitioning pier 1 is D=(0.02 to 0.1)W, and a height of the partitioning pier 1 is H=(1.0 to 1.1)HO. The front end of the partitioning pier 1 is rounded, a distance L3 between the partitioning pier 1 and an inlet side of the forebay 4 satisfies that L=L2+L3, and the rear end of the partitioning pier 1 is connected to a middle division pier 7 between pump units 6, with central lines of the two overlapping each other.
The combined beams 2 are distributed along the height direction of the partitioning pier and close to the front end of the partitioning pier, a number of the beams preferably ranges from 2 to 5, a spacing between the beams and the front end of the partitioning pier 1 is L4=(0 to 0.05)L, a beam at the top is flush with the top of the partitioning pier, a width of each beam is B1=(0.01 to 0.04)L, a height of each beam is H1=(0.1 to 0.3)HO, each of the beams is connected to side walls of the pump station forebay at two ends in the width direction of the pump station forebay, and a vertical distance between two adjacent beams is H2=(0.05 to 0.15)H0.
The flow directing plate 3 is a contracted folded plate, two ends of the flow directing plate 3 are connected to side walls on two sides of the pump station forebay 4, and the thickness of the flow directing plate 3 is B2=(0.005 to 0.03)L. The upper end of the flow directing plate 3 is a vertical plate that is perpendicular to the bottom face of the forebay 4 and the tail end of the partitioning pier 1 separately, where a height of the vertical plate is H3=(0.4 to 0.7)HO, and the lower end of the flow directing plate 3 is an inclined plate connected to an inlet end of the pump unit 6, where an angle between the inclined plate and the horizontal plane is 0=25 to 45 .
The partitioning pier 1, beams 2, and flow directing plate 3 as described above are metal structures or reinforced concrete structures, and may be welded or poured up at a construction or transformation site of urban drainage pump station engineering.
Embodiment 1 FIG. 2 and FIG. 3 show a schematic diagram of planar structural dimensions of a drainage pump station with a combined rectifying device of the present invention and a schematic diagram of structural dimensions of an elevation of the rectifying device, according to this embodiment.
A length of the pump station forebay 4 is L=8.5 m and a width thereof is W=18.3 m, a length of the expansion section of the inlet is L1=0.624L=5.3 m, an angle between a side wall of the expansion section and a central line of the forebay 4 is 13=24 , and a distance between the maximum operating level of the forebay 4 and the bottom thereof is H0=5.2 m. The pump station uses an inlet box culvert 5 with four inflow holes, and six pump units sequentially numbered a to f, where a flow rate of two pump units (c, d) is 2.04 m3/s, and a flow rate of the rest are 4.08 m3/s. The partitioning pier 1 is disposed along a central line of the pump station forebay 4, and is parallel to a main flow direction, a length of the partitioning pier 1 is L2=0.5L+tan(13/3)L=5.45 m, a width of the partitioning pier 1 is D=0.3 m, which is the same as a width of the middle division pier 7, and a height of the partitioning pier 1 is H=H0=5.2 m. The front end of the partitioning pier 1 is rounded, and a distance between the front end and an inlet side of the forebay 4 is L3=L¨L2=3.05 m. The combined beam 2 is formed by three beams distributed in the vertical direction, a spacing between the combined beam 2 and the front end of the partitioning pier 1 is L4=0.047L=0.4 m; the topmost beam 2 is flush with the top of the partitioning pier 1, a width of the beam 2 is B1=0.0353L=0.3 m, a height of the beam 2 is H1=0.154H0=0.8 m, and a vertical distance between two adjacent beams is H2=0.0577H0=0.3 m; the flow directing plate 3 is a contracted folded plate, and a thickness of the flow directing plate 3 is B2=0.0235L=0.2 m. The upper end of the flow directing plate 3 is a vertical plate that is perpendicular to the bottom face of the forebay 4 and the tail end of the partitioning pier 1 separately, where a height of the vertical plate is H3=0.577H0=3 m, and the vertical plate is flush with the end face of the middle division pier of the pump station. An angle between the inclined plate on the lower end of the flow directing plate 3 and the horizontal plane is 0=300.
The partitioning pier 1, the combined beam 2, and the flow directing plate 3 are made of reinforced concrete.
Embodiment 2 The combined rectifying device of this embodiment differs from Embodiment 1 in that: a length of an expansion section of an inlet of the pump station forebay 4 is L1=0.4L=3.4 m, and an angle between a side wall of the expansion section and a central line of the forebay 4 is 13=24 . A length of the partitioning pier 1 is L2=0.5L+tan(13/3)L=5.5 m, a height of the partitioning pier 1 is H=1.05H0=5.46 m, and a distance between the partitioning pier 1 and an inlet side of the forebay 4 is L3=L¨
L2=3 m. There are five beams, and a spacing of the beams and the front end of the partitioning pier 1 is L4=0.05L=0.425m. A width of the beams 2 is B1=0.01L=0.085 m, a height of the beams 2 is H1=0.1H0=0.52 m, and a vertical distance between two adjacent beams is H2=0.05H0=0.26 m. A thickness of the flow directing plate 3 is B2=0.03L=0.255 m, a height of the vertical plate of the flow directing plate 3 is H3=0.7H0=3.64 m, and an angle between the inclined plate at a lower end of the flow directing plate 3 and the horizontal plane is 0=25 .
Embodiment 3 The combined rectifying device for improving an inlet flow pattern of a multihole inflow pump station of this embodiment differs from Embodiment 1 in that: a length of an expansion section of an inlet of the pump station forebay 4 is L1=0.7L=5.95 m, and an angle between a side wall of the expansion section and a central line of the forebay 4 is 13=00. A length of the partitioning pier 1 is L2=0.5L+tan(13/3)L=4.25 m, a height of the partitioning pier 1 is H=1.1H0=5.72 m, and a distance between the partitioning pier 1 and an inlet side of the forebay 4 is L3=L¨L2=4.25 m. There are two beams 2, the beams are flush with the front end of the partitioning pier 1, that is, L4=0 m. A thickness of the beam 2 is B1=0.01L=0.34 m, a height of the beam 2 is H1=0.3H0=1.56 m, and a vertical distance between two adjacent beams is H2=0.15H0=0.78 m. A
thickness of the flow directing plate 3 is B2 = 0.005L = 0.0425m, a height of the vertical plate of the flow directing plate 3 is H3=0.4H0=2.08 m, and an angle between the inclined plate at a lower end of the flow directing plate 3 and the horizontal plane is 0=25 .
As shown in FIG.4, a three-dimensional flow numerical simulation method is used to compare and analyze flow rate distribution of overflow cross-sections in front of inlets of pumps before or after rectification by using the combined rectifying device of the foregoing embodiments of the present invention. The rectifying apparatus of the present invention is not used in FIG. 4a. That is, FIG. 4a shows flow rate distribution of overflow cross-sections when no rectification is performed by using the rectifying device of the present invention. It can be found from the figure that flow rate distribution of the inlets of the pumps is very uneven, because adverse flow phenomena, such as lateral flow, a high surface flow velocity, and a surface suction vortex, exist in the pump station forebay. From FIG.4b, FIG.4c, and FIG.4d, it can be found that flow rate distribution of the inlets of the pumps after rectification by the present invention becomes relatively uniform, which proves that the combined rectifying device of the present invention can significantly improve an inflow condition of a water pump, so that flow rate distribution is relatively uniform, thereby ensuring safe, efficient, and stable operation of a pump station and a pump unit.
The embodiments of the present invention have been described in detail above with reference to the drawings, but the present invention is not limited to the described embodiments. Various changes, modifications, substitutions, and variations of the embodiments made by those skilled in the art within the principle and the technical idea of the present invention all fall within the protection scope of the present invention.
There are two beams, and the beams are flush with the front end of the partitioning pier. A
width B1 of a single beam is 0.34 m, a height HI of the single beam is 1.56 m, and a vertical distance H2 between two adjacent beams is 0.78 m. A thickness B2 of the flow directing plate is 0.0425 m; and a height H3 of the vertical plate of the flow directing plate is 2.08 m, and an angle 0 between the inclined plate of the flow directing plate and the horizontal plane is 45 .
Advantageous Effects Advantageous effects of the present invention are as follows:
In the method for improving an inlet flow pattern of a multihole inflow pump station of the present invention, a combined rectifying device is used to suppress lateral flow in the pump station forebay, reduce the surface flow velocity of the forebay, and increase the bottom flow velocity of the forebay, thereby effectively preventing generation of a surface suction vortex and ensure that the pump has a good inflow condition, which is of significance in ensuring safe, stable, and efficient operation of the pump station.
The combined rectifying device provided by the present invention has a simple structure and can be easily manufactured, and is particularly suitable for popularization and application in construction and transformation of municipal drainage pump station engineering in a multihole inflow form.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG.1 is a schematic diagram of an elevation arrangement of the present invention.
FIG.2 is a schematic diagram of planar structural dimensions according to an embodiment of the present invention.
FIG.3 is a schematic diagram of structural dimensions of an elevation of a rectifying device according to an embodiment of the present invention.
FIG.4 is a comparison diagram of flow rate distribution of inlet cross-sections of pumps before and after rectification according to an embodiment of the present invention, where FIG.4a is a comparison diagram of flow rate distribution of inlet cross-sections of pumps before rectification, FIG.4b is a comparison diagram of flow rate distribution of inlet cross-sections of pumps after rectification in Embodiment 1; and FIG.4c is a comparison diagram of flow rate distribution of inlet cross-sections of pumps after rectification in Embodiment 2; FIG.4d is a comparison diagram of flow rate distribution of inlet cross-sections of pumps after rectification in Embodiment 3.
DETAILED DESCRIPTION OF THE INVENTION
The present invention is further described below with reference to the accompanying drawings and embodiments.
As shown in FIG.! to FIG.3, the present invention relates to technical features such as a partitioning pier 1, beams 2, a flow directing plate 3, a forebay 4, an inlet box culvert 5, a pump unit 6, and a middle division pier 7.
In a method for improving an inlet flow pattern of a multihole inflow pump station, an inlet box culvert is disposed at an inlet end of a pump station forebay, a combined rectifying device is disposed in the pump station forebay, the pump station forebay has an overall length of L and a width of W, a water inlet of the pump station forebay has a length less than the overall length L of the pump station forebay, the water inlet of the pump station forebay is in a shape of a flare toward an interior of the pump station forebay, which has an expansion section, a length of the expansion section is L1=(0.4 to 0.7)L, an angle between a side wall of the expansion section and a central line of the pump station forebay is p=o to 250, and the maximum operating level of the pump station forebay is HO.
The combined rectifying device includes a partitioning pier, beams, and a flow directing plate. The partitioning pier 1 is disposed along a central line of the pump station forebay 4, and is parallel to a main flow direction of the inlet box culvert, a length of the partitioning pier 1 is L2=0.5L+tan(13/3)L, a width of the partitioning pier 1 is D=(0.02 to 0.1)W, and a height of the partitioning pier 1 is H=(1.0 to 1.1)HO. The front end of the partitioning pier 1 is rounded, a distance L3 between the partitioning pier 1 and an inlet side of the forebay 4 satisfies that L=L2+L3, and the rear end of the partitioning pier 1 is connected to a middle division pier 7 between pump units 6, with central lines of the two overlapping each other.
The combined beams 2 are distributed along the height direction of the partitioning pier and close to the front end of the partitioning pier, a number of the beams preferably ranges from 2 to 5, a spacing between the beams and the front end of the partitioning pier 1 is L4=(0 to 0.05)L, a beam at the top is flush with the top of the partitioning pier, a width of each beam is B1=(0.01 to 0.04)L, a height of each beam is H1=(0.1 to 0.3)HO, each of the beams is connected to side walls of the pump station forebay at two ends in the width direction of the pump station forebay, and a vertical distance between two adjacent beams is H2=(0.05 to 0.15)H0.
The flow directing plate 3 is a contracted folded plate, two ends of the flow directing plate 3 are connected to side walls on two sides of the pump station forebay 4, and the thickness of the flow directing plate 3 is B2=(0.005 to 0.03)L. The upper end of the flow directing plate 3 is a vertical plate that is perpendicular to the bottom face of the forebay 4 and the tail end of the partitioning pier 1 separately, where a height of the vertical plate is H3=(0.4 to 0.7)HO, and the lower end of the flow directing plate 3 is an inclined plate connected to an inlet end of the pump unit 6, where an angle between the inclined plate and the horizontal plane is 0=25 to 45 .
The partitioning pier 1, beams 2, and flow directing plate 3 as described above are metal structures or reinforced concrete structures, and may be welded or poured up at a construction or transformation site of urban drainage pump station engineering.
Embodiment 1 FIG. 2 and FIG. 3 show a schematic diagram of planar structural dimensions of a drainage pump station with a combined rectifying device of the present invention and a schematic diagram of structural dimensions of an elevation of the rectifying device, according to this embodiment.
A length of the pump station forebay 4 is L=8.5 m and a width thereof is W=18.3 m, a length of the expansion section of the inlet is L1=0.624L=5.3 m, an angle between a side wall of the expansion section and a central line of the forebay 4 is 13=24 , and a distance between the maximum operating level of the forebay 4 and the bottom thereof is H0=5.2 m. The pump station uses an inlet box culvert 5 with four inflow holes, and six pump units sequentially numbered a to f, where a flow rate of two pump units (c, d) is 2.04 m3/s, and a flow rate of the rest are 4.08 m3/s. The partitioning pier 1 is disposed along a central line of the pump station forebay 4, and is parallel to a main flow direction, a length of the partitioning pier 1 is L2=0.5L+tan(13/3)L=5.45 m, a width of the partitioning pier 1 is D=0.3 m, which is the same as a width of the middle division pier 7, and a height of the partitioning pier 1 is H=H0=5.2 m. The front end of the partitioning pier 1 is rounded, and a distance between the front end and an inlet side of the forebay 4 is L3=L¨L2=3.05 m. The combined beam 2 is formed by three beams distributed in the vertical direction, a spacing between the combined beam 2 and the front end of the partitioning pier 1 is L4=0.047L=0.4 m; the topmost beam 2 is flush with the top of the partitioning pier 1, a width of the beam 2 is B1=0.0353L=0.3 m, a height of the beam 2 is H1=0.154H0=0.8 m, and a vertical distance between two adjacent beams is H2=0.0577H0=0.3 m; the flow directing plate 3 is a contracted folded plate, and a thickness of the flow directing plate 3 is B2=0.0235L=0.2 m. The upper end of the flow directing plate 3 is a vertical plate that is perpendicular to the bottom face of the forebay 4 and the tail end of the partitioning pier 1 separately, where a height of the vertical plate is H3=0.577H0=3 m, and the vertical plate is flush with the end face of the middle division pier of the pump station. An angle between the inclined plate on the lower end of the flow directing plate 3 and the horizontal plane is 0=300.
The partitioning pier 1, the combined beam 2, and the flow directing plate 3 are made of reinforced concrete.
Embodiment 2 The combined rectifying device of this embodiment differs from Embodiment 1 in that: a length of an expansion section of an inlet of the pump station forebay 4 is L1=0.4L=3.4 m, and an angle between a side wall of the expansion section and a central line of the forebay 4 is 13=24 . A length of the partitioning pier 1 is L2=0.5L+tan(13/3)L=5.5 m, a height of the partitioning pier 1 is H=1.05H0=5.46 m, and a distance between the partitioning pier 1 and an inlet side of the forebay 4 is L3=L¨
L2=3 m. There are five beams, and a spacing of the beams and the front end of the partitioning pier 1 is L4=0.05L=0.425m. A width of the beams 2 is B1=0.01L=0.085 m, a height of the beams 2 is H1=0.1H0=0.52 m, and a vertical distance between two adjacent beams is H2=0.05H0=0.26 m. A thickness of the flow directing plate 3 is B2=0.03L=0.255 m, a height of the vertical plate of the flow directing plate 3 is H3=0.7H0=3.64 m, and an angle between the inclined plate at a lower end of the flow directing plate 3 and the horizontal plane is 0=25 .
Embodiment 3 The combined rectifying device for improving an inlet flow pattern of a multihole inflow pump station of this embodiment differs from Embodiment 1 in that: a length of an expansion section of an inlet of the pump station forebay 4 is L1=0.7L=5.95 m, and an angle between a side wall of the expansion section and a central line of the forebay 4 is 13=00. A length of the partitioning pier 1 is L2=0.5L+tan(13/3)L=4.25 m, a height of the partitioning pier 1 is H=1.1H0=5.72 m, and a distance between the partitioning pier 1 and an inlet side of the forebay 4 is L3=L¨L2=4.25 m. There are two beams 2, the beams are flush with the front end of the partitioning pier 1, that is, L4=0 m. A thickness of the beam 2 is B1=0.01L=0.34 m, a height of the beam 2 is H1=0.3H0=1.56 m, and a vertical distance between two adjacent beams is H2=0.15H0=0.78 m. A
thickness of the flow directing plate 3 is B2 = 0.005L = 0.0425m, a height of the vertical plate of the flow directing plate 3 is H3=0.4H0=2.08 m, and an angle between the inclined plate at a lower end of the flow directing plate 3 and the horizontal plane is 0=25 .
As shown in FIG.4, a three-dimensional flow numerical simulation method is used to compare and analyze flow rate distribution of overflow cross-sections in front of inlets of pumps before or after rectification by using the combined rectifying device of the foregoing embodiments of the present invention. The rectifying apparatus of the present invention is not used in FIG. 4a. That is, FIG. 4a shows flow rate distribution of overflow cross-sections when no rectification is performed by using the rectifying device of the present invention. It can be found from the figure that flow rate distribution of the inlets of the pumps is very uneven, because adverse flow phenomena, such as lateral flow, a high surface flow velocity, and a surface suction vortex, exist in the pump station forebay. From FIG.4b, FIG.4c, and FIG.4d, it can be found that flow rate distribution of the inlets of the pumps after rectification by the present invention becomes relatively uniform, which proves that the combined rectifying device of the present invention can significantly improve an inflow condition of a water pump, so that flow rate distribution is relatively uniform, thereby ensuring safe, efficient, and stable operation of a pump station and a pump unit.
The embodiments of the present invention have been described in detail above with reference to the drawings, but the present invention is not limited to the described embodiments. Various changes, modifications, substitutions, and variations of the embodiments made by those skilled in the art within the principle and the technical idea of the present invention all fall within the protection scope of the present invention.
Claims (5)
1. A method for improving an inlet flow pattern of a multihole inflow pump station, an inlet box culvert being disposed at an inlet end of a pump station forebay, wherein a combined rectifying device is disposed in the pump station forebay, wherein the pump station forebay has an overall length of L and a width of W, a water inlet of the pump station forebay has a length less than the overall length L of the pump station forebay, the water inlet of the pump station forebay is in a shape of a flare toward an interior of the pump station forebay, which has an expansion section, a length of the expansion section is L1 =(0.4 to 0.7)L, an angle between a side wall of the expansion section and a central line of the pump station forebay is .beta.=0 to 25°, and maximum operating level of the pump station forebay is H0;
the combined rectifying device comprises a partitioning pier, beams, and a flow directing plate, wherein the partitioning pier is disposed along the central line of the pump station forebay and is parallel to a main flow direction of the inlet box culvert, a length of the partitioning pier is L2=0.5L+tan(.beta./3)L, a width D of the partitioning pier is the same as a width of a middle division pier between pump units, and a height of the partitioning pier is H=( 1.0 to 1.1)H0; front end of the partitioning pier is rounded, a distance L3 between the front end of the partitioning pier and the water inlet of the pump station forebay satisfies that L=L2+L3. and rear end of the partitioning pier is connected to the middle division pier on the central line in width direction of the pump station forebay, with central lines of the two overlapping each other;
a number of the beams ranges from 2 to 5, the beams are distributed along height direction of the partitioning pier and close to the front end of the partitioning pier, a spacing between the beams and the front end of the partitioning pier is L4=(0 to 0.05)L, top beam of the beams is flush with top of the partitioning pier, a width of each of the beams is B1=(0.01 to 0.04)L, a height of each of the beams is H1 =(0.1 to 0.3)H0, each of the beams is connected to side walls of the pump station forebay at both ends in the width direction of the pump station forebay, and a vertical distance between two adjacent beams of the beams is H2=(0.05 to 0.15)H0; and the flow directing plate is connected to the side walls of the pump station forebay at both ends in the width direction of the pump station forebay, a thickness of the flow directing plate is B2=(0.005 to 0.03)L, the flow directing plate comprises a vertical plate and an inclined plate, the vertical plate is closely placed against a front end of the middle division pier and is perpendicular to a bottom face of the pump station forebay, a height of the vertical plate is H3=(0.4 to 0.7)H0, and one end of the inclined plate of the flow directing plate is connected to a bottom end of the vertical plate, and the other end of the inclined plate is connected to an inlet end of a pump, and an angle between the inclined plate and horizontal plane is 0=25° to 45°.
the combined rectifying device comprises a partitioning pier, beams, and a flow directing plate, wherein the partitioning pier is disposed along the central line of the pump station forebay and is parallel to a main flow direction of the inlet box culvert, a length of the partitioning pier is L2=0.5L+tan(.beta./3)L, a width D of the partitioning pier is the same as a width of a middle division pier between pump units, and a height of the partitioning pier is H=( 1.0 to 1.1)H0; front end of the partitioning pier is rounded, a distance L3 between the front end of the partitioning pier and the water inlet of the pump station forebay satisfies that L=L2+L3. and rear end of the partitioning pier is connected to the middle division pier on the central line in width direction of the pump station forebay, with central lines of the two overlapping each other;
a number of the beams ranges from 2 to 5, the beams are distributed along height direction of the partitioning pier and close to the front end of the partitioning pier, a spacing between the beams and the front end of the partitioning pier is L4=(0 to 0.05)L, top beam of the beams is flush with top of the partitioning pier, a width of each of the beams is B1=(0.01 to 0.04)L, a height of each of the beams is H1 =(0.1 to 0.3)H0, each of the beams is connected to side walls of the pump station forebay at both ends in the width direction of the pump station forebay, and a vertical distance between two adjacent beams of the beams is H2=(0.05 to 0.15)H0; and the flow directing plate is connected to the side walls of the pump station forebay at both ends in the width direction of the pump station forebay, a thickness of the flow directing plate is B2=(0.005 to 0.03)L, the flow directing plate comprises a vertical plate and an inclined plate, the vertical plate is closely placed against a front end of the middle division pier and is perpendicular to a bottom face of the pump station forebay, a height of the vertical plate is H3=(0.4 to 0.7)H0, and one end of the inclined plate of the flow directing plate is connected to a bottom end of the vertical plate, and the other end of the inclined plate is connected to an inlet end of a pump, and an angle between the inclined plate and horizontal plane is 0=25° to 45°.
2. The method for improving the inlet flow pattern of the multihole inflow pump station according to claim 1, wherein the partitioning pier, the beams, and the flow directing plate are metal structures or reinforced concrete structures.
3. The method for improving the inlet flow pattern of the multihole inflow pump station according to claim 1, wherein the pump station forebay has the length L of 8.5 m and the width W of 18.3 m, the expansion section of the water inlet of the pump station forebay has the length L1 of 5.3 m, the angle between the side wall of the expansion section and the central line of the pump station forebay is .beta.=24°, and the maximum operating level H0 of the pump station forebay is 5.2 m; the partitioning pier has the length L2 of 5.45 m, the width D of 0.3 m, and the height H of 5.2 m, and the distance L3 between the front end of the partitioning pier and the water inlet of the pump station forebay is 3.05 m; the number of the beams is 3, the spacing L4 between the beams and the front end of the partitioning pier is 0.4 m, the width B1 of each of the beams is 0.3 m, the height HI of each of the beams is 0.8 m, and the vertical distance H2 between the two adjacent beams of the beams is 0.3 m; and the thickness B2 of the flow directing plate is 0.2 m, the height H3 of the vertical plate of the flow directing plate is 3 m, and the angle .theta. between the inclined plate of the flow directing plate and the horizontal plane is 30°.
4. The method for improving the inlet flow pattern of the multihole inflow pump station according to claim 1, wherein the pump station forebay has the length L of 8.5m and the width W of 18.3 m, the expansion section of the water inlet of the pump station forebay has the length L1 of 3.4 m, the angle between the side wall of the expansion section and the central line of the pump station forebay is .beta.=24°, and the maximum operating level H0 of the pump station forebay is 5.2 m; the partitioning pier has the length L2 of 5.5 m, the width D of 0.3 m, and the height H of 5.46 m, and the distance L3 between the front end of the partitioning pier and the water inlet of the pump station forebay is 3 m; the number of the beams is 5, and the spacing L4 between the beams and the front end of the partitioning pier is 0.425 m; the width B1 of each of the beams is 0.085 m, the height H1 of each of the beams is 0.52 m, and the vertical distance H2 between the two adjacent beams of the beams is 0.26 m; the thickness B2 of the flow directing plate is 0.255 m; and the height H3 of the vertical plate of the flow directing plate is 3.64 m, and the angle .theta. between the inclined plate of the flow directing plate and the horizontal plane is 25°.
5. The method for improving the inlet flow pattern of the multihole inflow pump station according to claim 1, wherein the pump station forebay has the length L of 8.5 m and the width W of 18.3 m, the expansion section of the water inlet of the pump station forebay has the length L1 of 5.95 m, the angle between the side wall of the expansion section and the central line of the pump station forebay is .beta.=0°, and the maximum operating level H0 of the pump station forebay is 5.2 m; the partitioning pier has the length L2 of 4.25 m, the width D of 0.3 m, and the height H of 5.72 m, and the distance L3 between the front end of the partitioning pier and the water inlet of the pump station forebay is 4.25 m; the number of the beams is 2, and the beams are flush with the front end of the partitioning pier; the width B1 of each of the beams is 0.34 m, the height HI
of each of the beams is 1.56 m, and the vertical distance H2 between the two adjacent beams is 0.78 m; the thickness B2 of the flow directing plate is 0.0425 m; and the height H3 of the vertical plate of the flow directing plate is 2.08 m, and the angle .theta. between the inclined plate of the flow directing plate and the horizontal plane is 45°.
of each of the beams is 1.56 m, and the vertical distance H2 between the two adjacent beams is 0.78 m; the thickness B2 of the flow directing plate is 0.0425 m; and the height H3 of the vertical plate of the flow directing plate is 2.08 m, and the angle .theta. between the inclined plate of the flow directing plate and the horizontal plane is 45°.
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| CN201710636326.7 | 2017-07-28 | ||
| CN201710636326.7A CN107327010B (en) | 2017-07-28 | 2017-07-28 | A method of improving the porous pumping plant Inlet flow pattern that becomes a mandarin |
| PCT/CN2018/074280 WO2019019581A1 (en) | 2017-07-28 | 2018-01-26 | Method for improving inlet flow pattern of porous inflow pump station |
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| CN (1) | CN107327010B (en) |
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| CN107327010B (en) * | 2017-07-28 | 2019-06-07 | 河海大学 | A method of improving the porous pumping plant Inlet flow pattern that becomes a mandarin |
| CN107956249B (en) * | 2017-11-14 | 2019-07-05 | 河海大学 | A method of improving municipal sewage Boosting pumping station Inlet flow pattern |
| CN108149769B (en) * | 2017-12-06 | 2019-07-05 | 河海大学 | A method of improving Urban Waterlogging pumping plant side unit Inlet flow pattern |
| CN109235626B (en) * | 2018-10-31 | 2021-05-18 | 扬州大学 | Box-type bidirectional runner with built-in special-shaped thin plate type backflow eliminating device |
| CN109629507B (en) * | 2019-01-04 | 2020-01-17 | 河海大学 | Method for improving hydraulic flow state of diffusion type diversion pool |
| CN110185102B (en) * | 2019-05-17 | 2020-11-10 | 河海大学 | Circular pump station catch basin provided with uniform water distribution device |
| CN111075008B (en) * | 2020-01-08 | 2021-01-05 | 河海大学 | Can realize even mixed well of reposition of redundant personnel |
| CN113586143A (en) * | 2021-06-17 | 2021-11-02 | 广州市市政工程设计研究总院有限公司 | Deep drainage tunnel system drainage pump station |
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| JPH1113128A (en) * | 1997-06-23 | 1999-01-19 | Kubota Corp | Prerotation tank |
| JP4116228B2 (en) * | 2000-04-28 | 2008-07-09 | 株式会社荏原製作所 | Pump water intake path |
| KR101253062B1 (en) * | 2012-11-02 | 2013-04-10 | 장민수 | Rainwater discharging pumping facilities having rainwater room to elevate the pump efficiency |
| CN202899101U (en) * | 2012-11-09 | 2013-04-24 | 广东省水利水电科学研究院 | Novel rectification facility in water inlet runner of large pump station |
| CN103669278B (en) * | 2013-11-30 | 2016-05-25 | 浙江省电力设计院 | Rectification facilities and the construction method of a kind of power plant's System in Large Circulating Water Pump station forebay |
| CN104775393B (en) * | 2015-02-13 | 2017-03-01 | 水利部交通运输部国家能源局南京水利科学研究院 | A kind of special-shaped anti-step rectification energy dissipating method and stiling basin |
| CN106759833B (en) * | 2016-11-11 | 2018-12-25 | 河海大学 | A kind of combined type fairing improving urban rainwater pumping plant Inlet flow pattern |
| CN106759665B (en) * | 2016-11-30 | 2023-04-07 | 华北水利水电大学 | Combined hydraulic rectifying device under ultralow water level of pump station water inlet pool |
| CN106836456B (en) * | 2017-01-17 | 2019-02-12 | 河海大学 | A kind of fairing improving rainfall pumping station water outlet box culvert assignment of traffic uniformity |
| CN106930199B (en) * | 2017-02-24 | 2019-02-12 | 河海大学 | Improve the fairing of arc Box-shaped Drainage Culvert water outlet fluidised form |
| CN107327010B (en) * | 2017-07-28 | 2019-06-07 | 河海大学 | A method of improving the porous pumping plant Inlet flow pattern that becomes a mandarin |
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| CA3067651C (en) | 2020-09-08 |
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