Patent ID: 6490510
Filing Date: 2002-12-03
Classification: G01P

Abstract:
A fixed multifunction probe for aircraft for measuring flow parameters of fluid flowing with respect to the probe, comprising:a body having symmetry of revolution about a longitudinal axis, closed by a rounded cap, the body being placed in the fluid flow, at least three pressure taps situated at specified positions of the body and distributed in plural sections so as to tap at least a first pressure, a second pressure, and a third pressure, pressure measurement means associated with the pressure taps for measuring at least as many pressures as pressure taps, calculation means for calculating a local angle of attack &agr; of the fluid flow by expressing a specified ratio of measured pressures as a function of the local angle of attack &agr; in a form: P1-P2P1+P2=A+B&CenterDot;cos&it;â€ƒ&it;2&it;â€ƒ&it;Î±+C&CenterDot;sin&it;â€ƒ&it;2&it;â€ƒ&it;Î±D+E&CenterDot;cos&it;â€ƒ&it;2&it;â€ƒ&it;Î±+F&CenterDot;sin&it;â€ƒ&it;2&it;Î±â€ƒA, B, C, D, E, F being constants dependent solely on coordinates of the pressure taps, the specified positions of the pressure taps being such that the specified ratio as a function of the local angle of attack &agr; is quasi linear, and the calculation means for calculating a total pressure Pt of the fluid flow at a level of the probe, a static pressure at upstream infinity of the probe Psâˆž, and dynamic pressure Ptâˆ’Psâˆž from pressure coefficients kP of the pressure taps.