PITOT-STATIC TUBE Russian patent published in 1998 - IPC

FIELD: determination of parameters of flight of flying vehicles or parameters of flow in wind tunnels. SUBSTANCE: pitot-static tube is made in form of two prismatic bodies located coaxially; their section has form of equilateral triangle with vertices shifted through angle of 60 deg; lateral faces of prisms are provided with inlet holes connected with pipe unions by means of pneumatic lines. Specific feature of this pitot-static tube consists in convex lateral faces of prisms at curvature radius R found from relationship R/r>1, where r is radius of circle drawn through vertices of triangle angles located in sections of prisms. Such construction of pitot-static tube makes it possible on one side to minimize effect of Reynolds number on pressure measurements and on other side to enhanced sensitivity of instrument due to rise of derivative of pressure being measured by downwash angle, thus considerably reducing instrument errors. EFFECT: reduction of instrument errors. 3 dwg , 1 tbl