Investigation into Influence of Wall Roughness on the Hydraulic Characteristics of an Axial Flow Pump as Turbine

Kan, Kan; Zhang, Qingying; Zheng, Yuan; Xu, Hui; Xu, Zhenshan; Zhai, Jianwei; Muhirwa, Alexis

doi:10.3390/su14148459

Cited by 7 publications

(5 citation statements)

References 31 publications

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“…ANSYS Fluent 2022R2 software is used to carry out stable numerical calculations. Based on the Navier-Stokes equation, the RNG k-ε model was chosen for flow analysis due to its greater precision in calculating high strain rate and intricate flows in PATs [29]. The impeller wall and adjacent chambers at the front and rear were identified as the rotating wall, while all other components were deemed static.…”

Section: Solution Parametersmentioning

confidence: 99%

Influence of Positive Guide Vane Geometric Parameters on the Head-Flow Curve of the Multistage Pump as Turbine

Wang,

Yang,

2023

Processes

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In order to reduce the impact of production changes on the performances of pumps as turbines (PATs) in the process industry, it is imperative to lessen head variations at different mass flow rates. This study established a relationship equation between theoretical head and geometric parameters for multistage PATs. The influence of these parameters on the flatness of the head-flow (H-Q) curve was determined through derivation methods. The original PAT was a two-stage pump, and 12 PAT models were designed by modifying the geometric parameters of the positive guide vanes. Fluent software was employed for numerical simulations. The study found that numerical calculations aligned well with theoretical derivations for the flat H-Q curve. Considering the geometric variations in the positive guide vane, increasing the outlet placement angle, blade number, and throat area or decreasing the base circle diameter was able to flatten the H-Q curve effectively; at the best efficiency point, the throat area had the most significant impact on a slope, followed by the outlet placement angle, blade number, and base circle diameter, respectively. The individual contributions to reducing the slope were 0.53, 0.24, 0.1, and 0.09. In terms of the best efficiency point (BEP) of PATs, increasing the throat area appropriately was able to improve the BEP of the PAT by around 1.65% and shifted its BEP towards higher flow rates. However, in other cases, the BEPs all decreased. Increasing the outlet placement angle of the positive guide vane by 3° led to the BEP being reduced by 0.79%. When the number of positive guide vane blades was increased from 8 to 10, the BEP decreased by 1.24%. When the diameter of the base circle of the positive guide vane was decreased, the BEP of the turbine decreased by 0.06%. This study provides theoretical support and can serve as a reference for the design of multistage hydraulic turbines with flatter H-Q curves.

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Section: Solution Parametersmentioning

confidence: 99%

Influence of Positive Guide Vane Geometric Parameters on the Head-Flow Curve of the Multistage Pump as Turbine

Wang,

Yang,

2023

Processes

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“…The AMSYS ICEM software is used to perform full hexahedral structured mesh division for the inlet and outlet pipe sections in the computational domain to ensure that the quality of the inlet and outlet pipes is greater than 0.6 to meet the calculation requirements [30,31]. The impeller and diffuser of the ESP are meshed in TurboGird, a special mesh generation software for turbomachinery, and the aspect ratio and orthogonality of the mesh are strictly limited.…”

Section: Meshing and Independence Verificationmentioning

confidence: 99%

The Effects of Meridian Surface Shape on the Pressure Pulsation of a Multi-Stage Electric Submersible Pump

Du¹,

Han

Xiao

et al. 2022

Sustainability

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The influence mechanism of the internal pressure fluctuation propagation law of multi-stage submersible electric pump (ESP) is still unclear, which has been a major problem restricting the stable exploitation of deep-sea oil and gas. In order to investigate the effect of different meridian profiles on the pressure pulsation characteristics of three-stage submersible electric pumps, the unsteady Reynolds-averaged Navier–Stokes (URANS) method is used to numerically investigate it. The results show that the lower the pressure pulsation amplitude in the pump caused by the meridional shape that is more in line with the flow law, has a positive effect on the operation stability. The change of the shape of the meridian greatly affects the pressure pulsation law in the secondary and final pumps. The rotor–stator interaction causes the pressure pulsation amplitude of the monitoring point in the middle of the pump chamber to reach a peak value. By using continuous wavelet transform analysis, it is found that the regularity of 1–2 times frequency conversion is complicated due to multiple pulsation sources and low frequency propagation coupling between stages. At 3–6 times frequency, it is basically close to the pulsation rule of the blade frequency. The above research provides a basis for improving the operation stability of the ESP.

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“…Multi-axis machining of complex shaped parts such as impellers, vanes and blades is an extremely important task [1][2][3][4][5]. In production conditions, difficulties are often encountered in the implementation of technological preparation for the production of such products.…”

Section: Introductionmentioning

confidence: 99%

A new algorithm for recreating the technological process of high-speed multicoordinate processing based on improving key indicators of image recognition

Pivkin,

Ershov,

Grechishnikov

et al. 2024

Optics, Photonics, and Digital Technologies for Imaging Applications VIII

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Solving the problem of reverse engineering as a key element of the production process and its technological preparation has a key role. This work demonstrates for the first time the possibility of preparing production and collecting key indicators, which allows you to recreate a digital twin of the technological process and display the technological aspects of the design as a result of collecting key indicators. Such indicators include the width of the cut layer, the cutting zone of a conical cutter during multi-axis positioning, obtained based on the results of processing a group of images of processed products. Actual technological indicators of the technological process can be identified and numerically formalized by assessing the shape of the helical surface on a class of parts obtained as a result of multi-coordinate processing, which proves the possibility of applied application of the method in the structure of the production process in real time. As a result, the use of a new algorithm will reduce the likelihood of receiving defective products and recreate the technological process based on processing a set of product images. The work constructs an analytical model for the automated creation of processing paths based on improved B-splines, which can significantly improve smoothness compared to numerical methods for generating paths. The actual technological indicators of the machining process can be identified and numerically formalized dependencies by determining the influence of the helical surface on the precise positioning of the end mill with compensation along each axis during 5-axis machining, obtained as a result of multi-axis machining, which proves the possibility of applied application of the method in the production process in the mode real time.

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Investigation into Influence of Wall Roughness on the Hydraulic Characteristics of an Axial Flow Pump as Turbine

Cited by 7 publications

References 31 publications

Influence of Positive Guide Vane Geometric Parameters on the Head-Flow Curve of the Multistage Pump as Turbine

Influence of Positive Guide Vane Geometric Parameters on the Head-Flow Curve of the Multistage Pump as Turbine

The Effects of Meridian Surface Shape on the Pressure Pulsation of a Multi-Stage Electric Submersible Pump

A new algorithm for recreating the technological process of high-speed multicoordinate processing based on improving key indicators of image recognition

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