Measuring and testing – Wind tunnel: aerodynamic wing and propeller study
Patent
1987-02-05
1988-09-13
Woodiel, Donald O.
Measuring and testing
Wind tunnel: aerodynamic wing and propeller study
73180, G01M 900
Patent
active
047700327
ABSTRACT:
A porous plug (10) is provided for the reduction or elimination of positive error caused by orifice (20) during static pressure measurements of airfoil (14). The porous plug (10) is press fitted into orifice (20), thereby preventing error caused either by fluid flow (30) turning into the exposed orifice (20) or by fluid flow (30) stagnating at the downstream edge (21) of orifice (20). In addition, porous plug (10) is flushed with the outer surface of airfoil (14), as by filing and polishing, to provide a smooth surface which alleviates error caused by imperfections in orifice (20). Porous plug (10) is preferably made of sintered metal, which allows air to pass through the pores, so that static pressure measurements can be made by remote transducers (not shown).
REFERENCES:
patent: 2448966 (1948-09-01), Fales
patent: 3327529 (1967-06-01), Bowles et al.
patent: 3559373 (1971-02-01), Garrett
Eves John W.
Gloss Blair B.
Plentovich Elizabeth B.
Stack John P.
Glenn Charles E. B.
Helfrich George F.
Manning John R.
The United States of America as represented by the Administrator
Woodiel Donald O.
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