CN-121997435-A - Design method of side water inlet and outlet of pumped storage power station based on minimum hydraulic loss

CN121997435ACN 121997435 ACN121997435 ACN 121997435ACN-121997435-A

Abstract

The invention relates to the technical field of side water inlets and outlets of pumped storage power stations, in particular to a design method of the side water inlets and outlets of the pumped storage power stations based on minimum hydraulic loss. By setting key body type parameters of a diffusion section and a vortex-proof beam section, designing middle piers and side piers to optimize flow distribution of each flow passage, respectively calculating the along-path hydraulic loss and the local hydraulic loss of each section, and then minimizing the total hydraulic loss coefficient of the whole flow passage as an optimization target.

Inventors

JIANG KUICHAO
CAO DAWEI
WANG YANFEI
WANG MI
WANG XUENING
SONG RUIXIANG
QIAN YUYING
LIANG JIANLONG
SHEN YAN
LIU XIAONAN
XU GUIBIN
LI BINYU

Assignees

中国电建集团北京勘测设计研究院有限公司

Dates

Publication Date: 20260508
Application Date: 20260130

Claims (10)

1. The design method of the side water inlet and outlet of the pumped storage power station based on the minimum hydraulic loss is characterized by comprising the following steps: S1, dividing a side water inlet and a side water outlet into a gradual change section, a diffusion section, an adjusting section and a vortex-proof beam section in sequence along the water flow direction, wherein the diffusion section comprises a front section, a middle section and a tail section; S2, setting a horizontal diffusion angle, a middle wall retreating distance and a top plate elevation angle of the diffusion section, setting the widths of the spacers of the middle section and the tail section of the diffusion section to be equal, and setting the beam number, the beam width and the beam spacing of the vortex-preventing beam section; S3, setting the shapes of the middle piers and the side piers to adjust the effective flow area of each flow passage, so that the flow distribution non-uniformity of each flow passage is controlled in a preset range; s4, respectively calculating the along-path hydraulic loss and the local hydraulic loss of the transition section, the diffusion section, the adjustment section and the vortex-preventing beam section; s5, the overall hydraulic loss coefficient of the overall runner of the side water inlet and outlet is minimized as an optimization target, and under the constraint that the existing engineering specifications are followed and the body type parameters of each section are in a reasonable design domain, the optimal combination of the body type parameters of each section is solved, and the overall hydraulic loss of the side water inlet and outlet comprehensive body type geometric parameters reaching the theoretical minimum value is determined.
2. The method for designing a side-entry and exit nozzle of a pumped storage power station based on minimum hydraulic loss according to claim 1, wherein the preset range of flow distribution non-uniformity is not more than 10%.
3. The design method of the side water inlet and outlet of the pumped storage power station based on the minimum hydraulic loss according to claim 1, wherein the horizontal diffusion angle of the diffusion section ranges from 25 degrees to 45 degrees.
4. The design method of the side water inlet and outlet of the pumped storage power station based on the minimum hydraulic loss according to claim 1, wherein the middle wall retreating distance of the diffusion section is 3-3.5 m or 1/2 of the inlet width of the side water inlet and outlet.
5. The design method of the side water inlet and outlet of the pumped storage power station based on the minimum hydraulic loss as set forth in claim 1, wherein the range of the elevation angle of the top plate of the diffusion section is [ [ ]。
6. The design method of the side water inlet and outlet of the pumped storage power station based on the minimum hydraulic loss according to claim 1, wherein the number of beams of the vortex-preventing beam section is 3-5, the beam width is 1.0-1.5 m, and the beam spacing is 0.8-1.5 m.
7. The design method of the side water inlet and outlet of the pumped storage power station based on the minimum hydraulic loss according to claim 1, wherein the width of the barrier is consistent among the middle section of the diffusion section, the end section of the diffusion section, the adjusting section and the vortex-preventing beam Duan Zhongbao.
8. The design method for the side water inlet and outlet of the pumped storage power station based on the minimum hydraulic loss according to claim 1, wherein the calculation mode of the hydraulic loss of each section along the way comprises the following steps: Along-travel hydraulic loss of transition section The formula of (2) is: Wherein, the For the length of the transition piece to be varied, To provide an along-the-path hydraulic loss factor (which varies with the pipe diameter of the flow channel), For the hydraulic diameter of the transition section, In order for the flow rate to be the same, Gravitational acceleration; along-travel hydraulic loss of the front section of the diffuser The formula of (2) is: Wherein, the For the length of the front end of the diffuser section, Is the pipe diameter of the middle two flow passages, Is the pipe diameter of two flow channels at two sides, In order to realize the hydraulic loss along the middle flow passage of the front section of the diffusion section, The hydraulic loss along the two side flow channels of the front section of the diffusion section; Along-path hydraulic loss of middle section of diffusion section The formula of (2) is: (intermediate flow passage) (Two-sided flow channel) Wherein L3 is the length of the middle section of the diffusion section, In order to realize the hydraulic loss along the middle flow passage in the middle section of the diffusion section, The hydraulic loss along the two side flow channels of the middle section of the diffusion section; Along-path hydraulic loss of diffuser L4 The formula of (2) is: wherein L4 is the length of the rear section of the diffusion section, For the intermediate runner of the diffuser section to lose hydraulic power along the way, The hydraulic loss along the two side flow channels of the diffusion section; adjusting the hydraulic loss of section L5 The formula of (2) is: Wherein, the Is the coefficient of the roughness of Manning, Is the hydraulic radius; the total along-path hydraulic loss is the sum of the along-path hydraulic losses of all parts The formula of (2) is: Wherein, the For the progressive layer L1 along-line hydraulic loss, For the hydraulic loss along the diffuser L2, For the hydraulic loss along the diffuser L3, For the hydraulic loss along the diffuser section L4, To adjust the hydraulic loss along the path of the segment L5.
9. The design method of the side water inlet and outlet of the pumped storage power station based on the minimum hydraulic loss according to claim 1, wherein the calculation mode of the local hydraulic loss of each section comprises the following steps: local hydraulic loss of transition L1 The formula of (2) is: Wherein, the As a local hydraulic loss coefficient, In order to achieve an average flow rate, Gravitational acceleration; Localized hydraulic losses at diffuser inlet The formula of (2) is: Wherein, the Is lost for the flow channels at the two sides, In order to achieve the loss of the intermediate flow channel, Is the horizontal diffusion angle of the glass fiber, Is the average flow rate; localized hydraulic losses in diffuser L2, diffuser L3, and diffuser L4 The formula of (2) is: Wherein, the As a local hydraulic loss coefficient, Is the average flow rate; localized hydraulic losses at diffuser exit The formula of (2) is: Local hydraulic loss of vortex-preventing beam section L6 The formula of (2) is: Wherein, the Is in the form of a coefficient of shape, Is the distance between the beams, For the width of the beam, Is the included angle between the vortex-preventing beam and the water flow direction; The total partial hydraulic loss is the sum of the partial hydraulic losses The formula of (2) is: Wherein, the For localized hydraulic losses at the transition L1, For localized hydraulic losses of the diffuser section L2, For localized hydraulic losses of the diffuser section L3, For localized hydraulic losses of the diffuser section L4, For localized hydraulic losses at the diffuser inlet, Is a localized hydraulic loss at the outlet of the diffuser.
10. The design method of the side water inlet and outlet of the pumped storage power station based on the minimum hydraulic loss according to claim 1, wherein the formula of the sum of the total hydraulic losses of the side water inlet and outlet is: Wherein, the Is the sum of the hydraulic losses of all parts along the way, Is the sum of the partial hydraulic losses of each part.

Description

Design method of side water inlet and outlet of pumped storage power station based on minimum hydraulic loss Technical Field The invention belongs to the technical field of side water inlets and outlets of pumped storage power stations, and particularly relates to a design method of a side water inlet and outlet of a pumped storage power station based on minimum hydraulic loss. Background With the acceleration of global energy structures to clean low-carbon transformation, the large-scale grid connection of renewable energy sources has set unprecedented high requirements on the flexibility adjustment capability of a power system. The pumped storage power station plays a key role in peak regulation and valley filling, frequency modulation and phase modulation, accident standby and the like by virtue of the remarkable advantages of high capacity, long-time energy storage, quick response, mature technology and the like. The pumped storage power station generally comprises an upper reservoir, a lower reservoir, a water delivery system, a power plant and the like. Because the water flow direction, the flow speed and the distribution in the water inlet and outlet areas are subjected to severe changes (such as shrinkage, diffusion and steering), the areas become one of the most concentrated and obvious parts of the local head loss in the whole water delivery system, and the total hydraulic loss of the water inlet and the water outlet has an important influence on the benefit of the pumped storage power station. At present, in a pumped storage power station built at home and abroad, the design of a side water inlet/outlet is mostly limited by factors such as construction difficulty, local geology and the like, and hydraulic loss is difficult to minimize in the design process. Meanwhile, the hydraulic loss is often accompanied with poor flow state (such as vortex, backflow, flow removal and asymmetric flow), strong vortex can lead to air intake, unit vibration and efficiency reduction even cavitation damage are caused, and backflow and flow removal can lead to structural vibration and cavitation corrosion, so that the safe and stable operation of the power station is further influenced. In view of this, the present invention has been made. Disclosure of Invention In order to solve the technical problems in the prior art, the invention provides a design method of a side water inlet and outlet of a pumped storage power station based on minimum hydraulic loss, which is capable of improving the power generation output by more effectively utilizing an effective water head, reducing the energy consumption under the pumping working condition so as to convey water to the same height, further improving the working efficiency of the power station, optimizing the flow state by minimizing the hydraulic loss, and obviously reducing the safety risk brought by the bad flow state. In order to achieve the above purpose, the technical scheme of the invention is as follows: the design method of the side water inlet and outlet of the pumped storage power station based on the minimum hydraulic loss is characterized by comprising the following steps: S1, dividing a side water inlet and a side water outlet into a gradual change section, a diffusion section, an adjusting section and a vortex-proof beam section in sequence along the water flow direction, wherein the diffusion section comprises a front section, a middle section and a tail section; S2, setting a horizontal diffusion angle, a middle wall retreating distance and a top plate elevation angle of the diffusion section, setting the widths of the spacers of the middle section and the tail section of the diffusion section to be equal, and setting the beam number, the beam width and the beam spacing of the vortex-preventing beam section; S3, setting the shapes of the middle piers and the side piers to adjust the effective flow area of each flow passage, so that the flow distribution non-uniformity of each flow passage is controlled in a preset range; s4, respectively calculating the along-path hydraulic loss and the local hydraulic loss of the transition section, the diffusion section, the adjustment section and the vortex-preventing beam section; s5, the overall hydraulic loss coefficient of the overall runner of the side water inlet and outlet is minimized as an optimization target, and under the constraint that the existing engineering specifications are followed and the body type parameters of each section are in a reasonable design domain, the optimal combination of the body type parameters of each section is solved, and the overall hydraulic loss of the side water inlet and outlet comprehensive body type geometric parameters reaching the theoretical minimum value is determined. Further, the preset range of flow distribution non-uniformity is no more than 10%. Further, the horizontal diffusion angle of the diffusion section ranges from 25 degrees to 45 degrees. Further, the middle