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Numerical Study on Characteristics of Pressure Fluctuation and Aerodynamic Noise of the Flow Field in a Counter-Rotating Axial Fan

Author: WangWeiBin
Tutor: ChenQingGuang
School: Shandong University of Science and Technology
Course: Fluid Machinery and Engineering
Keywords: Tornado aircraft Unsteady turbulent Pressure pulsation Aerodynamic noise Numerical Study
CLC: TH432
Type: Master's thesis
Year: 2009
Downloads: 128
Quote: 11
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Abstract


Compact the Tornado aircraft because of its structure, easy to install, as well as some of the advantages of pressure characteristics and anti-wind performance, and has been widely used in recent years in the field of mine ventilation, tunnel ventilation and boiler induced draft engineering. Tornado aircraft efficiency and noise reduction, and will bring considerable economic benefits and significant social benefits. With the improvement of computer performance and the development of numerical computing technology, numerical simulation method which has been widely used in the design and development process of turbomachinery. Diffuser exit flow field geometry model is imported into the Tornado aircraft from the current collector, and adaptable unstructured tetrahedral grid unit proper meshing using sliding mesh processing rotating domain with still domain between static and dynamic coupling; description of the cyclone inside the three-dimensional control of unsteady turbulent equations deduced using RNG k-ε turbulence model it closed, and discrete space domain and time domain ; to set a reasonable boundary conditions, SIMPLE algorithm to achieve the coupling between the velocity and pressure, fixed the Tornado aircraft design conditions run constant flow calculation, then steady flow calculation results as early completion of the non- given the steady flow calculation. This article computational fluid dynamics (CFD), computational aeroacoustics (CAA) and Fast Fourier Transform (FFT) method is a combination of the steady flow calculation based on the introduction of broadband sound source model based on the acoustic analogy theory, numerical prediction on Tornado aircraft aerodynamic noise parameters of acoustic power and intensity level distribution; unsteady flow calculation based on the time domain and frequency domain of air pressure pulsation fan passage components distribution, pursuant to which the fan internal airflow pressure pulsation frequency, intensity and variation within the fan. Given constant and the non regular flow of value calculated pressure, speed, vortex amount such as flow field parameters of the distribution law, through numerical simulation results and experimental results and the design parameters of contrast, to verify the accuracy of the numerical prediction results of; forecast results : two impeller of the Tornado aircraft and its nearby area is the area of ??most pressure pulsation in the flow field, moving - moving back and forth between the two impeller interference, moving between the front and rear stage impeller adjacent parts - static interference and The cycle of turbulent flow unsteady characteristics of the main causes of the Tornado aircraft aerodynamic noise generated. This paper the results of numerical studies to optimize the parameters of the Tornado aircraft and structural design to provide a reference, has important theoretical significance of the research and development of high performance fan and fan noise active control, to improve the overall performance of the Tornado aircraft and run security has important value in engineering.

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