On the basis of the spiral-like flow in the regenerative blower, with the panel method and the modeling method of flow field under propeller, a theoretical model is set up to calculate the aerodynamic load on the blade surface. Based on the FW-H equation, the regenerative blower’s shell is simplified. With the thin shell theory and the Lagrange energy method, a dynamic model of regenerative blower’s shell is set up. Using the boundary integral method, the theoretical calculation model of shell far field sound radiation is established. The distribution of sound radiation shows that the shell sound radiation is mainly in circumference, which is consistent with the test result. The calculation time is greatly reduced using the theoretical proposed by this paper than using the commercial software. According to the model, the influence of blade number, blade thickness, blade width and blade angle on shell sound radiation under the rotational noise excitation is studied at last. The sound pressure level (SPL) decreases with the increase of blade number. The blade thickness nearly has no effect on the SPL. With the increase of blade width, the SPL decreases at first and then increases. As the blade angle increases, the SPL of forward-curved blade increases and that of backward-curved blade decreases.
Key words
blade rotation noise /
thin shell theory /
shell sound radiation /
blade parameters
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Footnotes
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