Influence of Rotation Speed on Flow Field and Hydraulic Noise in the Conduit of a Vertical Axial-Flow Pump under Low Flow Rate Condition

Yang, Fan; Jiang, Dongjin; Yuan, Ye; Lv, Yuting; Jian, Hongfu; Gao, Hui

doi:10.3390/machines10080691

Cited by 10 publications

(4 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Li [8] et al numerically simulated the noise induced by an underwater submarine and found that the streaming noise at the same frequency is higher than the flow noise, and the acoustic monitoring point closer to the solid boundary has a higher acoustic signal intensity. Yang [9] et al used a combination of CFD and CA to numerically solve the flow field and internal acoustic field in a pump unit and found that the runner is the main source of hydrodynamic noise inside the pump. Ren [10] et al numerically calculated the structural vibration noise of underwater vehicles and found that the hydrodynamic noise is mainly generated by the turbulent fluctuating pressure excitation, the dominant frequency is mainly concentrated in the low-frequency range, and the radiation intensity of the noise is in line with the intrinsic vibration characteristics of the machinery.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Analysis of the Correlation between Hydrodynamic Noise of Hydraulic Turbines and Defects in Runner Blades

Liu,

Yu,

Qian

et al. 2024

Water

View full text Add to dashboard Cite

To investigate the hydrodynamic noise characterization of hydraulic turbines with runner blade defects, this article establishes the intact machine model and three kinds of models with runner blade defects. Using the Computational Fluid Dynamic (CFD) and Computational Acoustic (CA) hybrid simulation computational methods, the hydrodynamic noise field of the hydraulic turbine is numerically simulated, and the results of the acoustic near field and acoustic far field are shown. 1. The double-row leaf grille and the runner are the primary sound source areas of the hydraulic turbine, and the intensity of sound radiation from these areas is positively correlated with the degree of runner blade defects. 2. As the runner blade defects develop, the sound power level (SWL) increases more significantly in the guide vanes near the nose of the spiral case in the double-row leaf grille. The most pronounced increase in the SWL is observed at the defective craters on the runner blades. 3. The frequency of the defective noise signal is primarily concentrated in the low-frequency band. The dominant frequency amplitude associated with runner blade defects increases and rises after the occurrence of defects. Secondary frequency changes are also observed, and the location of these changes varies at different receiving points.

show abstract

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Analysis of the Correlation between Hydrodynamic Noise of Hydraulic Turbines and Defects in Runner Blades

Liu,

Yu,

Qian

et al. 2024

Water

View full text Add to dashboard Cite

show abstract

“…The daily operating stability of a pump device is strongly impacted by pressure pulsation, and the major approach used by researchers nowadays is a combination of model test and numerical simulation. Yang et al 10,11 examined the variation law of internal flow pulsation and hydraulic noise of the axial flow pump device as the pump operating condition using a combination of model test and numerical simulation, and assessed the evolution law of the vortex structure and pulsation change in the conduit when the axial flow pump device is utilized as a turbine. The features of pressure pulsation at the pump sump were analyzed by Song et al 12 utilizing the method of combining exploratory method and theoretical foundations anchored on the theoretical of vortex dynamics.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of the internal biased flow mechanism of the siphon outlet pipe under the action of axial flow pump

Yang,

Sun,

Jin

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part A:

Self Cite

View full text Add to dashboard Cite

One of the often employed flow structures in vertical pumping stations is the siphon outlet pipe. It has a complicated geometric structure and internal flow field, which directly affects how effectively, safely, and steadily pumping stations operate. The entire flow conduit of the vertical axial flow pump device was adopted as the study object in order to elucidate the mechanism of the internal biased flow of the siphon outlet pipe caused by the axial flow pump under different flow conditions, and the three-dimensional unsteady flow field of the vertical axial flow pump device was numerically solved using the numerical simulation technique. Physical model tests were used to confirm the results of the numerical simulation. The findings demonstrate that there is a horizontal bias in the flow of the inlet surface and outlet surface of the elbow pipe of the siphon outlet pipe, and that when the flow rate rises, the degree of the horizontal bias in the flow gradually diminishes, and the ratio of biased flow gradually decreases. The flow in hump segment presents up-and-down flow, and when the flow rate increases, the ratios of biased flow first rises before falling. The major causes of the production of biased flow in the outlet pipe are residual velocity circulation at the guide vane's outlet, wall constraint at the elbow pipe, and flow inertia; Under various flow conditions, the morphologies of the vortex structures in the outlet pipe vary; the characteristics of the energy conversion of each part of the pump device are disclosed, with the inlet pipe having the lowest proportion of energy conversion. Under the optimal flow condition, the elbow-inlet pipe's proportion of energy conversion is only around 1.04%, and the proportions of the guide vane, 60° elbow pipe, and siphon outlet pipe's energy conversion are significant and fluctuate with time. The proportion of energy conversion in the elbow-inlet pipe and siphon outlet pipe steadily increases as flow rate rises, but the proportion in the guide vane and 60° elbow pipe drops initially before increasing.

show abstract

“…The internal flow of an axial flow pump during operation is a complex three-dimensional unsteady flow, often resulting in complex flow phenomena and inducing strong pressure pulsations and vibration noise [6]. The study of the internal flow characteristics of axial flow pumps under different parameter conditions is a prerequisite for suppressing the level of pulsation and vibration noise inside the pump [7,8]. Currently, computational fluid dynamics is a powerful method for analyzing the detailed flow field structure inside a water pump; when combined with experimental methods, it can be used to study the complex flow patterns inside an axial flow pump device.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Complex Three-Dimensional Flow Structure in the Circulation Pump of the Flow-Making System Based on Delayed Detached Eddy Simulation

et al. 2023

View full text Add to dashboard Cite

As the core component of the flow-making system, the circulating pump has differences in its internal flow structure under different operating conditions, which affects the flow quality of the environmental simulation test area and the authenticity of marine environmental simulation. To explore the internal flow characteristics and outlet evolution characteristics of the circulating pump, this paper uses the DDES (delayed detached eddy simulation) method for numerical simulation. This paper combines BVF (boundary vorticity flow) diagnosis and the limit streamline method to analyze the evolution characteristics of the unstable flow area on the blade surface; it uses the Q criterion to identify the vortex structure inside the pump and analyze its evolution and development laws. Additionally, a quantitative analysis of the flow state of the circulating pump using flow uniformity indexes is performed. The results show that the surface of impeller blades is uniform under 1.0 QN. At 0.7 QN, the evolution process of the blade suction surface BVF is periodic, with a corresponding period of about 2/9 T (0.02 s). At 1.0 QN, the strength and scale of the separated vortices inside the guide vanes are minimized compared to other flow rates, and the scale and strength of the vortices show a decreasing trend along the outer normal direction. The evolution period of the separation vortex on the pressure surface of the guide vane is about 1/3 T (0.033 s) under 1.1 QN and the evolution period of the suction surface of the guide vane is about 2/3 T (0.067 s) under 0.7 QN. The flow uniformity indexes value downstream of the pump outlet under 1.0 QN are very close to the ideal value; with a corresponding value of Ϛi = 0.023, θ¯ = 89.94°, γ = 0.95, λ = 97.9%, the outflow can be approximately regarded as axial uniform flow. The research results can provide theoretical support for the further optimization design of circulating pumps and lay the foundation for the implementation of real systems.

show abstract

Influence of Rotation Speed on Flow Field and Hydraulic Noise in the Conduit of a Vertical Axial-Flow Pump under Low Flow Rate Condition

Cited by 10 publications

References 39 publications

Numerical Simulation Analysis of the Correlation between Hydrodynamic Noise of Hydraulic Turbines and Defects in Runner Blades

Numerical Simulation Analysis of the Correlation between Hydrodynamic Noise of Hydraulic Turbines and Defects in Runner Blades

Numerical analysis of the internal biased flow mechanism of the siphon outlet pipe under the action of axial flow pump

Analysis of the Complex Three-Dimensional Flow Structure in the Circulation Pump of the Flow-Making System Based on Delayed Detached Eddy Simulation

Contact Info

Product

Resources

About