Investigation Into the Phenomenon of Flow Deviation in the S-Shaped Discharge Passage of a Slanted Axial-Flow Pumping System

Wang, Chaoyue; Wang, Fujun; Tang, Yuan; Zi, Dan; Xie, Lihua; He, Chenglian; Zhu, Q. J.; Huang, Congbing

doi:10.1115/1.4045438

Cited by 21 publications

(21 citation statements)

References 15 publications

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“…And the low-frequency pressure fluctuation mechanism of pump unit under stall condition was revealed. Wang et al [8] investigated the flow deviation phenomenon in S-shaped flow passage in a slanted axial-flow pumping station, the 'unwinding' flow structure was discovered and the development of 'unwinding' structure in different locations of Sshaped discharge passage was revealed.…”

Section: Introductionmentioning

confidence: 99%

Analysis of flow loss characteristics of slanted axial-flow pump device based on entropy production theory

Yang

et al. 2022

R. Soc. open sci.

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Slanted axial-flow pump devices are widely applied in urban water supply, irrigation and drainage engineering fields. The second law of thermodynamics is applied to investigate the flow loss characteristics of the 30° slanted axial-flow pump model according to the flow loss analysis method of entropy production theory, so that the hydraulic loss characteristics can be revealed in internal flow process of the slanted axial-flow pump. The three-dimensional numerical simulation of the whole flow conduit in slanted axial-flow pump was conducted and the entropy production increased in the flow process was calculated. The location and distribution characteristics of the flow loss of the pump were qualitatively analysed. The results show that the entropy production in impeller is the highest among the pump components. With the increase of flow rate, the proportion of the entropy production in impeller in total value of the pump device increases continuously. The wall entropy production of impeller, guide vane and outlet conduit are lower than the mainstream entropy production, and the mainstream entropy production occupies the dominant position. As the flow rate grows, the proportion of turbulent dissipation entropy production decreases, and the proportion of wall dissipation entropy production increases. At 0.8 Q bep , the proportion of turbulent dissipation entropy production is close to 74%, which is about 2.8 times that of wall entropy production. Under 1.2 Q bep condition, the proportion of turbulent dissipation entropy production is just 5.5% higher than that of wall dissipation entropy production.

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Section: Introductionmentioning

confidence: 99%

Analysis of flow loss characteristics of slanted axial-flow pump device based on entropy production theory

Yang

et al. 2022

R. Soc. open sci.

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“…Domestic and foreign scholars have done a lot of research on the slanted axial-flow pump; for example, Zhang et al [1] numerically simulated the cavitation performance of the slanted axial-flow pump under different working conditions and explored the causes of the collapse of the cavitation performance of the slanted axial-flow pump. Wang et al [2] found that there was a flow deviation phenomenon in the S-shaped channel of the 15 • slanted axial-flow pump, and carried out numerical simulation research and field measurement on the test bench to clarify the mechanism of this phenomenon. Yang et al [3], based on Reynolds-averaged Navier-Stokes equations and RNG k-ε turbulence model, studied the three-dimensional fluid flow in a slanted axial-flow pump, analyzed the velocity distribution and stress distribution of the flow field in the slanted axial-flow pump under different working conditions, and found that they were in good agreement with the experimental study.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Pressure Pulsation in a Slanted Axial-Flow Pump Device under Partial Loads

Yang

Chang

et al. 2021

Processes

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The 30° slanted axial-flow pump device is widely used in agricultural irrigation and urban drainage in plains areas of China. However, during the actual operation process, the 30° slanted axial-flow pump device is prone to vibration, noise, cracks in the blades, and other phenomena that affect the safe and stable operation of the pump device. In order to analyze the flow pressure pulsation characteristics of the 30° slanted axial-flow pump device under different flow conditions, the time–frequency domain analysis method was used to analyze the pressure pulsation of each flow structure of the 30° slanted axial-flow pump device. The results showed that the internal pulsation law of the elbow oblique inlet flow channel is similar. At the 1.2 Qbep condition, the amplitude fluctuation of the pressure pulsation was small, and the main frequency is 4 times the rotating frequency. The monitoring points at the outlet of the elbow oblique inlet flow channel were affected by the impeller rotation, and the pressure pulsation amplitude was larger than that inside the elbow oblique inlet flow channel. The pressure fluctuation of each monitoring point at the inlet surface of the impeller was affected by the number of blades. There were four peaks and four valleys, and the main frequency was 4 times the rotating frequency. The amplitude of pressure fluctuation increased gradually from the hub to the rim. The main frequency of pressure fluctuation at each monitoring point of the impeller outlet surface was 4 times of the rotating frequency, and the low frequency was rich. The amplitude of pressure fluctuation was significantly lower than that of the impeller inlet. With the increase of flow rate, the peak fluctuation of pressure coefficient decreased gradually, and the amplitude of pressure fluctuation tended to be stable. Under 0.8 Qbep and 1.0 Qbep conditions, the large fluctuation of the pressure fluctuation amplitude on the outlet surface of the guide vane was mainly affected by the low-frequency fluctuation. Under the 1.2 Qbep condition, the pressure fluctuation amplitude changed periodically.

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“…Pump devices are generally divided into vertical, slanted and tubular pump devices according to the flow passage form. Due to the extensive use of axial flow pump devices, many experts have studied the optimization and design of various types of pump device [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Study on the Comparison of the Hydraulic Performance and Pressure Pulsation Characteristics of a Shaft Front-Positioned and a Shaft Rear-Positioned Tubular Pump Devices

Lü

Liu

et al. 2021

JMSE

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The shaft front-positioned tubular pump device has been widely used in practical engineering, but the shaft rear-positioned pump device is rarely used due to its low efficiency. To investigate the effect of the shaft position on the performance of a tubular pump device, the optimized shaft front-positioned and shaft rear-positioned pump devices were compared and studied. Both tubular pump devices adopt a TJ04-ZL-06 pump model. Three dimensional steady and unsteady numerical simulations combined with model tests were used to compare the difference of two pump devices. Meanwhile, three groups of pressure monitoring points were set at different positions of the pump device to collect pressure information and pressure pulsation was analyzed. The results show that, the highest efficiency of the shaft front and rear positioned pump device are 81.78% and 80.26%, respectively. The hydraulic performance of the two inlet passages is excellent, and the hydraulic loss is close to each other. Therefore, the hydraulic performance of the pump device depends mainly on the hydraulic performance of the outlet passage. The shaft is set in the outlet passage, which will increase the hydraulic loss and reduce efficiency. Under design conditions, the pressure pulsation amplitude at the impeller inlet is the largest, and the pressure pulsation amplitude increases from the hub to the shroud. The pressure pulsation amplitude of the shaft rear-positioned pump device is larger than that of the shaft front-positioned pump device. The pressure pulsation at the impeller inlet and outlet is greatly affected by the number of blades, and the main frequency is three times the RF. This study can provide practical and effective guidance for the design and optimization of the shaft front-positioned and rear-positioned tubular pump devices, which has theoretical value and application value.

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Investigation Into the Phenomenon of Flow Deviation in the S-Shaped Discharge Passage of a Slanted Axial-Flow Pumping System

Cited by 21 publications

References 15 publications

Analysis of flow loss characteristics of slanted axial-flow pump device based on entropy production theory

Analysis of flow loss characteristics of slanted axial-flow pump device based on entropy production theory

Numerical Study on Pressure Pulsation in a Slanted Axial-Flow Pump Device under Partial Loads

Study on the Comparison of the Hydraulic Performance and Pressure Pulsation Characteristics of a Shaft Front-Positioned and a Shaft Rear-Positioned Tubular Pump Devices

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