Sistema de túnel de vento aplicado no monitoramento de pressão dinâmica.

Abstract

This paper reports the results of the design and manufacture of an automated instrumentation wind tunnel applied to dynamic pressure monitoring in aerodynamic models. To this end, a wind tunnel equipped with commercially available precision instruments was first developed to characterize airflow velocity through which it travels. Afterwards, a turbine was installed to generate a continuous air flow in the tunnel, so the measuring system installed in the test section collects the speed information. Data were collected by a PLC (Programmable Logic Controller) acquisition system, stored in a SQL Server database and presented in a supervision system. Pressure variations on the aerodynamic model were obtained using a sensitive thin layer deposited on the surface of the aerodynamic model, a technique known as Pressure Sensitive Paint (PSP). The sensitive layer is a PVC film doped with platinum Octaethylporphyrin PtOEP molecules, the dynamic pressure sensing was monitored by photoluminescent emission of the PtOEP molecules collected with a CMOS camera, thus images of the dynamic pressure distribution on the surface of the aerodynamic model. The system for dynamic pressure imaging consisted of a 380 nm laser source to excite the sensitive layer and the CMOS camera with an optical bandpass filter tuned to the photoluminescent emission range of the textit PtOEP molecules blocking the excitation light on CMOS camera.