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Analysis of Multi-blade Centrifugal Fan on CFD and Noise Prediction

Author: RanMiaoMiao
Tutor: WangJun
School: Huazhong University of Science and Technology
Course: Fluid Machinery and Engineering
Keywords: Multi-blade centrifugal fan Numerical calculation Unsteady flow field Aerodynamic noise
CLC: TH432
Type: Master's thesis
Year: 2007
Downloads: 420
Quote: 2
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Abstract


Flow coefficient , pressure coefficient coefficient is small size and relatively low noise multi-blade centrifugal fan , it is widely used in the air conditioning industry . In recent years , the use of more mature CFD commercial software Numerical analysis of the fan internal flow field , has become an important means of technology . The traditional design methods of the multi-blade centrifugal fan were analyzed and summarized , based on the use of four Bezier curve fan blade profile design . And based on deep understanding of large-scale commercial software FLUENT , combined with existing the parametric software design method , using object-oriented technology and database technology , a more complete modeling of multi-blade centrifugal fan parameterized software . Parameterized modeling software for multi-blade centrifugal fan internal flow field numerical simulation and analysis of the internal flow characteristics . The study showed that the internal flow field showing a very complicated three-dimensional characteristics of multi-blade centrifugal fan . Any change of the structural parameters of the multi-blade centrifugal fan , will affect the distribution of the internal flow field , causing the fan external performance changes . Relatively large impact structure parameters of the multi-blade centrifugal fan performance blades Import and Export install angle , number of blades , the current collector structure , motor shape . To study the impact of these parameters on the flow field in the fan to change the internal flow field changes , and fan losses caused to the analysis and discussion of the different structure parameters , draw some useful conclusions for future multi-blade centrifugal fan structural optimization designed to provide a reference . This paper presents a not directly solve the acoustic field analysis method was able to provide useful information for the centrifugal fan noise reduction . First, calculate the unsteady flow field of multi- blade centrifugal fan inside ; then , using the time domain and frequency domain analysis methods the convection venue static pressure pulsation intensity and frequency analysis ; Finally, determined in accordance with the basic theory of the acoustic fan internal the major aerodynamic noise source location and type of noise . Draw some useful conclusions for the future provide a useful reference for further analysis of the multi-blade centrifugal fan noise .

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