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- W1600218572 abstract "The objective of this study was to acquire acoustic and flow data for numerical validation of impedance models that simulate bias flow through perforates. The impedance model is being developed by researchers at High Technology Corporation, Hampton, Virginia. This report documents normal incidence impedance measurements for a singular circular orifice with mean flow passing through it. All measurements are made within a 1.12 inch (28.5 mm) diameter impedance tube. The mean flow is introduced upstream of the orifice (with the flow and incident sound wave travelling in the same direction) with an anechoic termination downstream of the orifice. Velocity profiles are obtained upstream of the orifice to characterize the inflow boundary conditions. Velocity in the center of the orifice is also obtained. All velocity measurements are made with a hot wire anemometer and subsequently checked with mass flow measurements made concurrently. All impedance measurements are made using the Two-Microphone Method. Although the analysis of the data has been left to the developers of the impedance models that simulate bias flow through perforate, the initial examination by the authors indicates that these results follow the trends consistent with published theory on impedance of perforates with a steady bias flow." @default.
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- W1600218572 date "2000-12-01" @default.
- W1600218572 modified "2023-09-22" @default.
- W1600218572 title "Acoustic Absorption Characteristics of an Orifice With a Mean Bias Flow" @default.
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