Air data probe
An air data probe ( 10 ) and associated method of method of measuring air data is disclosed. The air data probe includes a plurality of air pressure sensors, and a body ( 14 ) that encloses a hollow interior cavity ( 16 ), where the body ( 14 ) has a generally symmetrical airfoil profile. The body ( 14 ) includes a plurality of projections ( 20 a - d ) extending beyond the generally symmetrical airfoil profile, each of the plurality of projections ( 20 a - d ) including an pressure port ( 22 a - d ) at a distal end ( 24 a - d ) that is in communication with the hollow interior cavity. Each of the pressure ports ( 22 a - d ) receives a corresponding air pressure sensor ( 12 a - d ) that is configured to collect static and dynamic air pressure data.
1. An air data probe comprising:
a plurality of air pressure sensors; and
a body that encloses a hollow interior cavity, wherein the body has a longitudinal axis and a generally axial-symmetrical airfoil profile about the longitudinal axis,
wherein the body includes a plurality of projections extending radially outwardly from an external surface of the body, each of the plurality of projections including a pressure port at a distal end that is in communication with the hollow interior cavity, and
wherein each of the pressure ports receives a corresponding air pressure sensor configured to collect local static and dynamic air pressure data,
wherein each of the projections has a rearwardly extending portion, the projection and the rearwardly extending portion forming a teardrop shape with a rounded portion at an upstream end and a tapered rear section that terminates at a point at a downstream end that is configured to minimize turbulence caused by the projections and drag of the body of the air data probe.
2. The air data probe of claim 1 ,
wherein the plurality of projections extend from the external surface of the body by a distance that is greater than or at least equal to the thickness of a boundary layer, and
wherein the distance allows measurement of the local static pressure that is induced by air flow velocity.
3. The air data probe of claim 1 , wherein distribution of the pressure ports is both equally around a circumference of the body and at an angle less than 90 degrees relative to the longitudinal axis of the air data probe.
4. The air data probe of claim 1 , wherein the generally axial-symmetrical airfoil profile includes a bulbous shaped front portion.
5. The air data probe of claim 1 ,
wherein the body further includes a front pressure port that receives a corresponding air pressure sensor configured to collect the local static and dynamic air pressure data.
6. The air data probe of claim 1 , further comprising:
a pressure sensor located inside the hollow interior cavity that is configured to measure freestream static air pressure to determine barometric altitude.
7. The air data probe of claim 1 , further comprising:
internal electronics configured to interpret the local static and dynamic air pressure data produced from each of the plurality of air pressure sensors.
8. The air data probe of claim 7 , further comprising:
an electric power supply configured to supply power to the internal electronics and the pressure sensors; and
a data transmission structure configured to transmit data to a flight computer or display devices within a cockpit of an aircraft.
9. The air data probe of claim 1 , wherein the plurality of projections are disposed equally around the circumference of the body.
10. The air data probe of claim 1 , further comprising:
a surface heating element configured to de-ice at least the body of the air data probe.
11. The air data probe of claim 10 , wherein the surface heating element is a microwave emitter.
12. The air data probe of claim 1 , wherein each of the plurality of air pressure sensors is sealed with an elastic material.
13. A method of measuring air data comprising:
providing an air data probe including a plurality of air pressure sensors and a body that generally encloses a hollow interior cavity, the body has a longitudinal axis and a generally axial-symmetrical airfoil profile about the longitudinal axis, wherein the body includes a plurality of projections extending radially outwardly from an external surface of the body and wherein each of the projections has a rearwardly extending portion, the projection and the rearwardly extending portion forming a teardrop shape with a rounded portion at an upstream end and a tapered rear section that terminates at a point at a downstream end, the rearwardly extending portion being configured to minimize turbulence caused by the projections and drag of the body of the air data probe; and
measuring local static and dynamic air pressure through pressure ports disposed in the plurality of projections using the plurality of air pressure sensors, wherein the projections extend from the external surface of the body by a distance that is greater than or at least equal to the thickness of a boundary layer, wherein the distance allows for measurement of the local static pressure that is induced by air flow velocity of an airfoil when the airfoil moves relative to air.
14. The method of claim 13 , wherein the measuring of the local static and dynamic air pressure utilizes the plurality of projections extending from external surface of the body that are both disposed equally around the circumference of the body and rotated by an angle less than 90 degrees from the longitudinal axis of the air data probe.