Abstract
A multipurpose sound propagation analysis facility has been built at the Herrick Laboratories of Purdue University. The main purpose of this facility is to carry out basic studies related to the area of multiple pure-tone sound radiation from supersonic rotors. Spinning modes are generated by use of eight speakers, whose input is monitored to obtain a desirable phase relationship. Sound transmission, with or without flow, can be analyzed in the case of a hollow cylinder or various annular cylinders. The case of conversion from an annular to a hollow cylinder could also be studied. An anechoic termination simulates the very long duct case and it could be removed to study the finite-length case. Radial and axial traverses are used and correlation technique is used to obtain circumferential information. The test section could be lined with various absorbents. The paper also discusses possibilities of future modifications of the facility. [Work supported by NASA Lewis under Grant No. NAS 3-18010.]
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