A methodology for precision additive manufacturing through compensation
Shukri AfazovAnnestacy OkiogaAdam HollowayWillem DenmarkAndrew TriantaphyllouSean-Anthony SmithLiam Bradley-Smith
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Distortion (music)
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The efficiency of a centrifugal pump is determined on the Hydraulic Model of impeller,disk friction loss of impeller is proportional to outlet diameter loss of 5-power,and reducing outlet diameter is an important method for improving efficiency of a pump.This paper uses impeller parameters to modify and optimize geometrical parameters of impeller blades,and calculate outlet angles of blade according to literature when outlet diameter of impeller is minimum.This approach maximizes the efficiency of impellers.
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Abstract The impeller is the most important part of the centrifugal pump because it determines the flow or efficiency of the pump. The design of the impeller and its diameter are very essential when considering pump efficiency. The capacity of the pump is determined from the impeller vanes and channels. The three types of impellers include open impeller, enclosed impeller and semi-open impeller are each designed for a specific application. Impellers are made of cast iron or carbon steel and special alloys depending on their application. The research involves the study of the application of impellers in the centrifugal pumps used by Rand Water Company in Johannesburg. The paper considers how variations in the impeller diameter affect the performance of the centrifugal pump. Simulations were conducted at different diameters of the impeller. The impeller was modelled using AutoCAD and simulated using ANSYS software to determine the performance of the centrifugal pump on different diameters. Calculations were done to compare the results of simulation of the different diameters of 2000mm, 2200mm, and 2400mm. The results show that changing the diameter of a pump impeller affects the flow, head and input brake horsepower of the pump in different proportions. The centrifugal pump gives a high flow rate as the diameter of the impeller increases.
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Rotodynamic pump
Specific speed
Horsepower
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Purpose To design and fabricate a wear testing rig for a water pump impeller and to select a parameter that can be used to determine the wear rates of slurry pump impeller. Design/methodology/approach A wear equipment was designed and fabricated in this study that of main rotating shaft, supported by two ball bearings, and main electric motor bully mechanism for the rotational speed torque needed. An impeller made of cast iron was selected. The wear medium selected consists of solid particles and water. The tests were conducted by letting the impeller to rotate in slurry. The wear data collection are divided into impeller's weight loss, impeller's diameter loss, impeller blade's thickness loss, impeller's blade height loss and impeller's thickness change. Findings The major type of wear that takes place in this experiment is erosion. The weight loss of the impeller is due to the material removal from the impeller as result of erosion wear. The diameter loss of the impeller is attributed to the impingement of solid particles on the surface area. The surface topography under the microscope indicates that the region near the center of impeller encounters less wear compared to the region at the rim of the impeller. Originality/value From this study, among all the parameters studied, the height loss of impeller blades encounters the highest percentage of wear. This is useful for determining the running hours before the complete failure of the impeller for slurry and impeller types used in this study.
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The CFD technology was applied in impeller designing,based on Navier-Stokes equations and the standard k - e Turbulent mode, geometric parameters of impeller designing are optimized according to the 3-D simulation results. So the flow patterns in the impeller are close with the ideal flow pattern and therefore ensure the good properties of the impeller.
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Specific speed
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Through numerical simulation was made on the impeller orientation angle(β),the number of the impeller(n) and the impeller length(L0) of the impeller of rotating jet bits for studying influence of impeller parameters of the bits on the jet flow field and its rules.The results show that when the impeller orientation angle is β=50~60°,the number of the impeller is n=4,the impeller length is L0 =20~25mm,the best impeller of rotating effect and energy transfer efficiency are achieved for fluid.In the three parameters,the impeller orientation angle plays a major role for the effect of the jet flow field,the number of the impeller is second,the impeller length is the minimum.
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As a result of the research, it was found that the blades of the working impellers of the pumps are eroded at the inlet and outlet. Based on software studies, the points of erosion caused by cavitation and sand particles at the entrance of the impeller and the points of operation of the impeller under heavy load have been determined. The operating points under heavy load are compared with working impellers in nature. After comparison with software developments, it is determined that they are compatible with working impellers in natural conditions. The following impeller model is recommended to reduce cavitation and erosion processes in the impeller (Figures. 6, 10). The recommended impeller is shown in the inlet of the impeller to free water entry, prevent water shortage, and reduce the level of cavitation. (Figures 6, 10, 11). The ingress of water into the impeller is freed, the continuous movement of water is restored, and the methods of preventing the processes of decay and holes formed in the impeller are given. Recommended methods of significantly reducing the level of wear in the input and output parts of the impeller are given.
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Economic shortage
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The non pre-stressing and pre-stressing modal analysis for impeller were computed by software ANSYS, and the unsteady flow for centrifugal fan was simulated by software CFX, at the same time the air pressure around the impeller was obtained. The results show that, the pre-stressing effect will improve the values of natural frequencies of impeller, but the increased values of the natural frequencies are different, the main frequency of air pressure fluctuation around the impeller is equal to the blade passing frequency of impeller, and it will not caused the danger of fatigue failure of impeller.
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Centrifugal fan
Natural frequency
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Centrifugal compressor
Slip factor
Diffuser (optics)
Tip clearance
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Taking the compressor impeller as the research object and the lightweight design as the research goal, a lattice filled lattice cell suitable for the application of rotating periodic symmetric structure is designed. Its purpose is to make the rigidity and strength of impeller adjustable and reduce the mass of impeller on the premise of meeting the design requirements. The analysis and comparison of unfilled impeller, solid impeller and lattice filled impeller with different diameters were carried out under the limit condition of 80,000 r/min. The results showed that the average circumferential deformation of lattice impeller tip with beam diameter of 0.2 mm, 0.4 mm and 1 mm was 4.84%, 3.49% and 3.71% lower than that of solid impeller. For the impeller with a lattice beam diameter of 0.4 mm, its weight can be reduced by 22.68% compared with the solid impeller. The average circumferential deformation of the tip of the lattice impeller lies between the unfilled impeller and the solid impeller. The results show that the impeller with lattice filling hub can not only reduce the weight effectively, but also improve the efficiency of the compressor.
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Lattice (music)
Centrifugal compressor
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In the case of design of impeller of compressor, the tuning of the geometry of the impeller is done keeping performance of the impeller. The frequency caused by rotation of the impeller also prohibit to coincident with characteristic frequency of the impeller. There are several line up of impellers for needs, and the tuning had been determined by designer who conducted many kind of examination for those impellers. Recently, response surface method utilizing design of experiments could estimate all of the geometry of impellers, and the method could find optimized geometry of the impeller satisfied with the operating conditions. In this study, we indicate effectiveness of response surface method utilizing design of experiments.
Centrifugal compressor
Slip factor
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