Dynamic Pressure Calibrator for Wind Tunnel Models

Current approaches to the calibration of dynamic pressure sensors used in wind tunnel testing either excite the sensor with a very low pressure level, or are not suitable for use once the sensor is installed on the test article. In this proposal, CSA describes the research and development of a portable dynamic pressure calibrator. The proposed system will enable the calibration of installed pressure sensors using realistic pressure levels and frequencies. The research will leverage a previous dynamic pressure calibration system development and apply advances in actuation, conditioning and control. CSA's proposed effort begins with requirements definition, and then proceeds to a feasibility study of two conceptual designs. In the first design, an electromagnetic actuator coupled to an acoustic cavity provides the dynamic pressure. The second design modulates the flow of compressed air using a valve and a rotating disc. The Phase I effort concludes with a prototype demonstration of the feasibility of the chosen conceptual design. In Phase II we perform the detail design, fabrication, and testing of a complete dynamic pressure calibration system. The finished system will result in more accurate data, quicker diagnostics of failed sensors, and overall reduced test costs to wind tunnel operators and users.