The Optimum Curve of Centrifugal Fans and its Application
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A number of existing centrifugal fans’ aerodynamic sketches and dimensionless characteristics are investigated and evaluated by means of statistical method. Based on the statistical data, the optimum curve of centrifugal fans is replenished and amended. The paper also puts forward the relation curve between exit width of blade and diametral quotient, and discusses its application in fans’ design and calculation.Keywords:
Dimensionless quantity
Centrifugal fan
Centrifugal force
The effect of rotor blade dynamics on aerodynamic and structural loads is examined for a conventional, main- rotor helicopter using both a comprehensive rotorcraft analysis (CAMRAD) and night test data. The impact of blade dynamics on blade section lift-coefficient time histories is studied by comparing predictions from both a rigid blade analysis and an elastic blade analysis with helicopter flight test data. The elastic blade analysis better predicts high-frequency behavior of section lift. In addition, components of the blade angle of attack, such as elastic blade twist, blade nap rate, blade slope velocity, and inflow, are examined as a function of blade mode. Elastic blade motion affects the blade angle of attack by a few tenths of a degree, and up to the sixth rotor harmonic. A similar study of the influence of blade dynamics on bending and torsion moments was also conducted. The modal analysis of the predicted blade structural loads suggested that five elastic bending deg of freedom (four flap and one lag) and three elastic torsion deg of freedom contributed to calculations of the blade structural loads. However, when structural bending load predictions from several elastic blade analyses were compared with flight test data, an elastic blade model consisting of only three elastic bending modes (first and second flap, and first lag), and two elastic torsion modes was found to be sufficient for maximum correlation.
Blade element theory
Dynamics
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Multistage centrifugal fan with high performance and reliability will play a greater role in human life and production. Multistage centrifugal fan has become a trend and direction of the centrifugal fan development. This paper analyzes the multi-stage centrifugal fan, mainly to explore the multi-stage centrifugal fan design point.
Centrifugal fan
Centrifugal force
Centrifugal compressor
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Structure formation of blade is analyzed according to complex wing blade profile of centrifugal fan; the advanced three-dimensional design software Pro/ENGINEER is used to avoid shortcoming of low efficiency and big error for conventional fan blade hand -drawing design. Quick and exact modeling of fan blade is achieved; efficiency and precision of design is promoted.
Centrifugal fan
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The characteristics of the three-dimension flow field of the G4-73 centrifugal fan were numerically simulated based on the k-epsiv turbulence model with the Fluent, and then verified the simulating result by experiment. Taking the efficiency eta maximizing as a function goal, while the blade number and the angle of blade outlet as the variable quantities, the fan impeller parameters are optimized based on least squares method. The optimizing results showed that the performance of centrifugal fan was improved by lowering the energy loss which caused by the secondary flow vortex, the volute tongue, the wake-jet and the angle of attack. After the optimization, the total pressure and efficiency increased 3.7% and 0.5% respectively.
Centrifugal fan
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The blade shape design is one of the most important factor for improvement of efficiency or noise reduction of a centrifugal fan. However, it is not easy to analyze flow through impeller blades both theoretically and experimentally. This paper describes an experimental investigation of flow through impeller blades of a fundamental model of the centrifugal fan and a multi-blade fan by means of quantitative method of visualization. The results obtained show the instantaneous profiles of flow through blades.
Centrifugal fan
Slip factor
Fan-in
Internal flow
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The centrifugal fan is an important rotation part on the motor,which must have sufficient strength and rigidity to ensure the safe operation of the motor sustained and effective.With the increasing of capacity and the diameters of the fan,the fan needs higher requirements on its strength and stiffness.The traditional calculation method cannot have satisfied the requirements.Besides centrifugal force the fan blade high wind pressure which plays an important role on strengthe and stiffness of fan when the fan runs.Base on ANSYS fluid-structure interaction,the present paper analysis the centrifugal fan strength and stiffness respectively and made a detailed comparison of the results to prove the improtance of fluidstructure interaction in fan strength as well as stiffness desgin,and take a centrifugal fan of a certain variable speed constant frequency 1.5 MW wind power generator as an example.The results show that the flow field of centrifugal fan has a great influence on the strength and stiffness.This study is helpful for the design f centrifugal fan and for characterization of the strength and stiffness properties of centrifugal fan.
Centrifugal fan
Centrifugal force
Rigidity (electromagnetism)
Structural rigidity
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Centrifugal fan is one of the most familiar fans; it applies broadly in the field of country economy. Based on the test of the single centrifugal fan, suction characteristic of the centrifugal fan in series is carried out. The work conditions for the centrifugal fan in series and the relationship between the single fan and fans in series are pointed out .References are given for selecting the parameters of fans in series.
Centrifugal fan
Centrifugal force
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The aim of this paper is to obtain a higher flow rate and lower noise multi-blade centrifugal fan by employing a type of optimized bionic blade. The design of experiment with orthogonal array tables is used in the optimization process. The factors of the geometric parameters of the bionic blade which selected in the present study are leading edge curvature, leading edge thickness, the leading edge angle and pressure side surface curvature. The contribution of each factor to the performance of bionic blade is investigated numerically by solving Navier-Stokes equation and FW-H equation. The pressure side surface curvature of the blade is considered as the most effective factor. Compared with the original blade, the optimal bionic blade not only improve the flow rate of multi-blade centrifugal fan, but also suppress noise occurred on the blade surface effectively. The values of the flow rate and the A-weighted sound pressure level (SPL) for the fan with optimal bionic blade are 2.75m3/s, 44.9dB(A) respectively against the initial fan of 2.55m3/s, 52.4dB(A). The optimization results demonstrate considerable improvement of the multi-blade centrifugal fan in both flow rate and A-weighted SPL when the optimized bionic blade is used.
Centrifugal fan
Leading edge
Mechanical fan
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The concrete consideration of the hydrodynamical design method of multiblade centrifugal fans is stated on the basis of the theoretical results described in the lst Report, with special reference to the suitable blade arrangement and blade section for the fan. We see from the numerical results that the higher peripheral speed and accordingly the back-inclined blade would give higher efficiency. Two blade sections with given surface pressure distributions in the above suitable blade arrangement are calculated.
Centrifugal fan
Section (typography)
Centrifugal force
Basis (linear algebra)
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Using the commercial CFD software ANSYS-CFX,numerical simulations of a single stage,high speed centrifugal fan on variable conditions were conducted.The SST turbulence model was employed to obtain the detailed flow field of the centrifugal fan.The axial force calculation of the centrifugal fan with the traditional empirical formula method and the CFD integral method were compared and analyzed.The results show that the change of axial force is greater on variable conditions during operation.The accurate prediction of axial force has important significance for the stable operation of high speed centrifugal fan and the selection of thrust bearing.It can provide reference and guidance for the structural design of high speed centrifugal fan production and the study of axial force prediction.
Centrifugal fan
Centrifugal force
Mechanical fan
Axial Compressor
Internal flow
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