Sensors for the Measurement of Flow Induced Surface Pressure Fluctuations: Calibration and Detection of Clipping

* Presenting author
Day / Time: 21.03.2018, 09:00-09:20
Room: MW 1050
Typ: Regulärer Vortrag
Abstract: Flow induced surface pressure fluctuations are thought to be the elementary sources of sound emitted from bodies subjected to a flow. In many direct high fidelity computational aeroacoustic simulations, the surface pressure fluctuations are obtained as an intermediate result and serve as an input for determining the acoustic field. It is therefore of utmost interest to reliably measure these quantities.The paper presents a study of how to select and calibrate sensors for the measurement of surface pressure fluctuations. Calibration methods are compiled and compared. A method for detecting clipping due to overload of a sensor is presented. Eventually, in an in-house built experimental setup, different tests of two types of miniature electret condenser microphones, flush-mounted in the trailing edge region of a wind turbine blade section, are carried out.