Papers by Keyword: Impeller

Abstract: The impeller has many characteristics, such as having thin wall, low rigidity, the quality of time-varying and it easy to produce deformation and vibration in process. In order to predict the flutter during processing, milling system dynamics model is established first, and then research three-dimensional flutter stability lobes of milling system by the fully discrete method. Finally analyzes the impeller machining allowance change on the influence of the flutter stability lobes and the milling parameters on the stability of the milling system dynamics.

Abstract: The processing technology of turbocharger impeller shaft involves shaft processing and Impeller processing two aspects of content. The design of casting impeller’s processing technology is based on reducing metal removal of the impeller dynamic balance. Casting impeller is an efficient method for the production of impellers, the dynamic balance of precision casting impeller itself can be used to achieve the use requirement of the impeller. It can meet the requirement of dynamic balance as the impeller rotation when the axis of impeller’s symmetry axis as locating datum in the process of machining. It means reduced the metal removal of dynamic balance. We Put the impeller axis symmetry as the processing benchmark, and then design a processing method of shaft and impeller. It can ensure concentricity of the two shafts when implement the processing technology of shaft and impeller after welding. At the same time achieve the requirements of the minimum Metal removal of Impeller shaft dynamic balance.

Abstract: In the same well water flooding process, solid particles contained in the fluid often result in the impeller submersible electric pump to erosion wear. We use Fluent software to establish the model of flow field,and use numerical simulation method to analyze the erosion wear. We use the erosion theory to calculate the erosion wear rate,and verify the correctness by the contrast between the results of numerical simulation and actual value.

Abstract: In order to study the matching optimization of the impeller and volute as well as the flow characteristics of double-channel with double-suction pump ,this paper based on CFD performance prediction method uses the same impeller to match the volute with different base diameters, guaranteeing the volute inlet width, flow cross-sectional area, and tongue position unchanged .The calculation results show that scheme A with the largest volute base diameter can not only achieve the excellent energy characteristics and the velocity-pressure uniform distributions, but also the exchange of the fluid energy is more sufficient in the volute. On one hand, a large clearance can not only make the movement interference intensity weaken between the impeller and volute, but also can decrease the high frequency components of the pressure pulsations .On the other hand, the big gap can maximum exert the pump effects to convey liquids containing solid suspended particles as well as the fibrous suspended matters. The research can not only provide some references to further study on matching optimization of the impeller and volute but also can contribute to the hydraulic design of the impeller and volute.

Abstract: The numerical simulation of internal flow field of a mixed-flow fan was carried out on the star-CD platform. Three-dimensional steady turbulent flow is calculated using the standard k-ɛ turbulence model, and the pressure distribution, velocity distribution and other important flow phenomenon inside the fan are obtained. The number of meshes has important influence on the result, meanwhile, fan inlet, impeller, outlet interact with each other. The results of numerical simulation can accurately analyze the fan flow field. The results of numerical simulation can accurately analyze the fan flow field structure, and provide guidance for further optimization and improvement of the fan.

Abstract: The high-specific-speed centrifugal pumps are very common in industrial factory for transporting fluids all day long. However, oversized pumps with low performance still could meet the purpose of fluid transporting. The aim of this study was to reduce the existed commercial impeller energy consumption by optimizing the performance of impeller through CAE processes. The impeller model was first generated by BladeGen software and analyzed by CFX in Turbo-mode. The optimized model then exported to machine center to cut the precise aluminum mold. A regular sand die casting processes were used to manufacture the impeller. The original pump which only impeller was replaced with the new one was tested with performance measurement system again. The results show that when the mass flow rate between 40-90kg/s the CFD software predicted very well pump heads and efficiencies with experimental data, which was called optimized impeller. But around the minimum and maximum flow rate region, the recirculation flow between blades and frictional loss model used still need further investigation to shrink the difference. Compare to the original impeller, the optimized one had increased efficiency 6% at the mass flow rate of 80kg/s. Also the high efficiency region (nearby of BEP) of the new impeller had broadened 50%. And the maximum mass flow rate increased 13% than the original one.

Abstract: The mode of the impeller of steam turbines vibration frequency is recorded by simulated experiment of the impellers vibration in the exciting method. And the main negative effects for the impeller of steam turbines vibration are analyzed through the simulated experiment, so the impellers vibration can be avoided through modulating the targeted elements. The accident during the steam turbines running caused by the impellers vibration can be decreased.

Abstract: By using the FINE software developed by NUMECA Company, the hydraulic performance of the impeller of a centrifugal pump with spatial guide vanes was numerically simulated. The S-A turbulent model was used to numerically calculate the three-dimensional flow field in the centrifugal pump under three different conditions. The flow analysis shows that the pressure gradient on the vane surface gradually reduces with the increasing of the flow rate; the position of axial vortex between vanes has nothing to do with the flow rate; the tangential flow gradient in the flow passage decreases with the increasing of the flow rate. Compared with the test results, it is obvious that this numerical simulation can accurately predicate the complicated three-dimensional flow and the hydraulic performance of the pump.

Abstract: The impeller is key element that brings about negative pressure adsorption. The efficiency of the impeller will determine the adsorption capacity of robot. In this paper, physical model is built based on the theory of fluid dynamics by taking a common high speed rotation of impeller as a research object. The basic parameters and boundary conditions are set and a 3D fluid dynamic simulation is done based on FloEFD. The factors such as blade curve, rotational speed and air inlet velocity which have effect on surface flow field impeller are investigated. Then the results are shown by figures and the study analysis is carried on.

Abstract: The Computational Fluid (CFD) technology has been successfully used in the numerical simulation of the turbulent flow of centrifugal pump.In this article , we carry on the experiment by using uses ANSYS software,based on the standard k-ε model, SST model and BSL model , to get the the flow field of the numerical simulationof the impeller .We found that the simulation results and the actual results are different under different turbulence models. Then we can draw out the Q-η curve and compare it with the actual test data.Compared with other turbulence models, The SST model is more suitable for the models of centrifugal pumps in the article.Furthermore,we list the pressure contours and velocity vectors for pumps discussed in the paper under the optimal model.The process can provide a theoretical reference for the optimization and further study of the centrifugal pump in the future.