Multi-objective shape optimization of siphon outlet in pumping station considering two-phase flow

Li, Zhixiang; Chen, Huixiang; Xu, Hui; Feng, Jiangang; Chen, Yaohui; Shi, Mige; Tong, Hongwei

doi:10.1177/09576509221113920

Cited by 4 publications

(4 citation statements)

References 30 publications

(47 reference statements)

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“…In the field of energy power generation, China currently mainly relies on thermal power generation and hydroelectric power generation, which account for more than 90% of the total power generation capacity. [1]Three quarters of the electricity comes from coal, and only China burns over 1.4 Gt of coal annually for power generation. In addition to fossil fuels such as coal, the Earth also has abundant renewable energy sources such as wind and solar energy.…”

Section: Introductionmentioning

confidence: 99%

“…During the development of wind power, there are often cases of major accidents such as malfunctions, shutdowns, and even fires caused by overheating of high-power components of wind turbines, such as generators, gearboxes, frequency converters, and control cabinets. [1]The development of new cooling technologies is not only of great help to the future development of wind power generation, but also has significant economic and social benefits. As a commonly used thermal management method, existing wind turbines mainly use air-cooled and liquid cooled technologies.…”

Section: Introductionmentioning

confidence: 99%

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Two phase flow evaporative cooling technology for wind turbine cabin group

Hu,

2024

Eighth International Conference on Energy System, Electricity, and Power (ESEP 2023)

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The thermal management of wind turbines is an important guarantee for their long-term stable and reliable operation. This article combines a new type of pump driven two-phase flow cooling system with the heat dissipation system of wind turbines, compares wind turbines using two-phase flow cooling systems, studies their system performance during simulated operation in a certain wind turbine cabin, and conducts fitting research and performance analysis on their thermal characteristics. The results indicate that a water cooling system with a flow rate of 3L/min can provide heat dissipation that can be achieved using only a two-phase flow cooling system with a flow rate of 0.05L/min. In transitional seasons and winter conditions, utilizing pneumatic heat pipe technology and fluorine pump technology for refrigeration, fully utilizing natural cooling sources, the annual energy efficiency ratio (AEER) reaches 8-10, and the new heat dissipation technology can ensure the long-term reliable and safe operation of future wind turbines.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Two phase flow evaporative cooling technology for wind turbine cabin group

Hu,

2024

Eighth International Conference on Energy System, Electricity, and Power (ESEP 2023)

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“…There may also be a large hydraulic loss of the flow channel during the siphon process, a high head during the pump operation, causing vibration of the unit, excessive noise, and other adverse hydraulic phenomena, which cause great harm to the safety and stability of the project. 1 The internal flow pulsation of the SOC under the hydraulic coupling of the pump and the flow conduit is thus of great theoretical relevance and engineering practical benefit.…”

Section: Introductionmentioning

confidence: 99%

“…In the actual pumping station project, if the design is not considered properly or the influence of external factors such as water level and flow rate, the SOC may take a long time to form a stable siphon flow or cannot realize the siphon. There may also be a large hydraulic loss of the flow channel during the siphon process, a high head during the pump operation, causing vibration of the unit, excessive noise, and other adverse hydraulic phenomena, which cause great harm to the safety and stability of the project 1 . The internal flow pulsation of the SOC under the hydraulic coupling of the pump and the flow conduit is thus of great theoretical relevance and engineering practical benefit.…”

Section: Introductionmentioning

confidence: 99%

Time–frequency signal analysis of flow pulsation in siphon outlet conduit based on HHT considering the pump‐conduit interaction

Yang

Lin

Ding

et al. 2023

Energy Science & Engineering

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The unsteady three‐dimensional numerical simulation calculation of the vertical axial flow pump device is performed based on CFD to examine the pressure pulsation and energy distribution features of the water flow within the siphon outlet conduit (SOC) under the hydraulic coupling of the pump and the flow conduit. The pressure pulsation signals (PPS) of monitoring points are decomposed using the Hilbert–Huang approach via empirical mode decomposition (EMD) and Hilbert spectrum analysis. The results show that the PPS of monitoring points of the SOC has no obvious periodicity. The low‐frequency range below 20 Hz serves as the primary frequency, and the energy ratio of the high‐frequency signal above 700 Hz is less than 1%. Under the condition of a small flow rate 0.3Qbep, there is obvious high‐frequency pulsation above 500 Hz at the inlet of the upstream section of the SOC, and there are periodic components distributed around 200 Hz. The energy of the pressure pulsation is primarily focused in the low‐frequency range below 40 Hz at the SOC outlet section. The PPS at the top and bottom monitoring points of the hump section are consistent, and the pressure pulsation energy (PPE) is mainly concentrated in the low frequency below 40 Hz. In both the big flow condition (1.2Qbep) and the optimal flow condition (1.0Qbep), the PPE of the monitoring points at the top of the hump section is distributed in the middle and low‐frequency band below 40 Hz, and the energy of monitoring points at the bottom of the hump section is concentrated in the low‐frequency band below 20 Hz, accounting for more than 70%. When the flow rate increases from 0.3Qbep to 1.2Qbep, the peak value of the pressure pulsation coefficient at the main frequency of each monitoring point at the top of the hump section changes little, and the peak value of the pressure pulsation coefficient at the main frequency of each monitoring point at the bottom increases first and then decreases. From the upstream section to the hump section of the SOC, the average frequency of each intrinsic mode function (IMF) of the PPS under different flow conditions shows an overall increasing trend. From the hump section of the SOC to its outlet, the average frequency of each IMF of the PPS decreases under the conditions of 1.0Qbep and 1.2Qbep, and there is no obvious change under the condition of 0.3Qbep.

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