Small aircraft propeller noise with ducted propeller - CAFE Foundation

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Copyright© 1998, American Institute of Aeronautics and Astronautics, Inc.kV =>given<strong>with</strong> shroud, 6=45°Frequency (Hz)1500 2503BPF (OB, re:20 pPa)Figure 9. Spectrum Plot With Shroud(-75° rotational frequency of the <strong>propeller</strong>D => diameter of ductB=> number of rotor bladesnumber of stator bladesc=>speed of sound=> integerFor propagation of the tone to occur, On, has to begreater than Q, since Qis subsonic. The rotationalvelocity ofany particular mode is by,kV— (i)469
Copyright© 1998, American Institute of Aeronautics and Astronautics, Inc.are presented1 throughhaveductTable 1. CutoffmJ mf*m(Hz)frequencies for mode11.841214523.0542242m (hubtotip ratio =0, radial mode =0)34.201233245.317542056.415650767.501359278.577867789.6474762and can be rewritten as in Eq. 2 to determine values ofk.-8/3
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Small aircraft propeller noise with ducted propeller - CAFE Foundation

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