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Study of Aerofoil Optimization of Axial Ventilator

Author: LuFen
Tutor: ChenHuanXin
School: Huazhong University of Science and Technology
Course: Refrigeration and Cryogenic Engineering
Keywords: Axial ventilation fans Optimization Numerical Simulation Flow field distribution
CLC: TH432.1
Type: Master's thesis
Year: 2009
Downloads: 72
Quote: 0
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Abstract


Ventilation mechanical efficiency is not high , is the main cause of Ventilation for buildings energy consumption , Axial Ventilator also exists as a mechanical ventilation efficiency is not high , and the axial ventilation fan night continuous operation to produce larger noise exists problem, and the axial ventilator design technological backwardness is the main cause of these problems . Paper a model axial ventilator for the study , the axial ventilator model transformation, combined with computational fluid dynamics software FLUENT the flow field of the whole basin of the axial ventilation fans and its transformation model distribution was simulated and comparative analysis of the corresponding transformation by means of the pressure field of the fluid domain distribution, velocity field , the performance curve of results . Papers by numerical calculations were simulated pressure and velocity fields within the catchment of the axial ventilation fan before and after reconstruction . Simulation the axial ventilation fan machine model appropriate simplification, such as omitting a the hub complex internal structure , does not consider the actual model round . The axial ventilator machine watersheds k ? Epsilon model calculations ; energy conservation equation . The model used in all tetrahedral mesh , the larger arc of the blades at variable velocity field and pressure field gradient finer mesh . Axial ventilation fans to add the leading edge of the trailing edge of the boss model and blade inlet and outlet angle adjustment model numerical simulation results are analyzed in detail . The calculated results show Ventilator Axial flow field distribution before and after transformation and performance curves obtained before and after adding the transformation means , through comparative analysis , the inlet can effectively reduce the velocity gradient , inhibiting the flow separation line of the blade root , and to a certain extent to strengthen the stiffness of the blade to blade flutter is small , but the ventilation rate will decline ; installation angle change has some influence on the ventilation fan performance , and there is an optimum angle so that the fan the best performance , and relatively small manufacturing errors will impact performance, so in the manufacturing process to ensure the accuracy of production . The research demonstrates that the rehabilitation programs of the flow field played a positive or negative impact on the results of these experiences can provide a theoretical basis for the next step to optimize the design of axial ventilation fans .

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CLC: > Industrial Technology > Machinery and Instrument Industry > Gas compression and transportation machinery > Fan > Centrifugal ( radial flow ) > Axial
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