Publication Date:
2019-07-13
Description:
A nonreactive orifice in an infinite baffle is analyzed. The pressure difference delta across the orifice varies sinusoidally with amplitude 1.0 and average value -P. The orifice resistance, delta p is discontinuous at zero velocity and exhibits the constant values R sub + and R sub - for u 0 and u 0, respectively. The resultant velocity has power in all harmonics of the excitation frequency. A quasi-linear resistance is defined and found to be relatively insensitive to the presence or absence of a resonant backing cavity; however, it does vary from 1.33 R sub + to 0.67 R sub + for a resistance ratio R sub +/R sub - between 0.5 and 2.0.
Keywords:
FLUID MECHANICS AND HEAT TRANSFER
Type:
NASA-TM-X-72624
,
Meeting of the Acoust. Soc. of Amer.; Nov 08, 1974; St. Louis, MO; United States
Format:
application/pdf
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