Arrangement of dams in air data probe

Patent metadata

Field	Value
Publication number	US-10126320-B2
Application number	US-201715457912-A
Country	US
Kind code	B2
Filing date	Mar 13, 2017
Priority date	Mar 13, 2017
Publication date	Nov 13, 2018
Grant date	Nov 13, 2018

Abstract

An air data probe is provided. The air data probe includes a pitot probe having a mounting base or flange, support strut, and tube with a forward facing inlet that is configured to capture a total pressure of the surrounding air, at least three dams placed within the tube of the pitot probe for blocking the ballistic trajectory of water droplets or ice crystals from passing directly through the tube to a downstream pressure sensing element, and a heater element integrated into the tube of the pitot probe on the outside of the dams. The at least three dams are oriented within the tube of the pitot probe in such a way that the dam locations are configured for two or more installations of the air data probe.

First claim

What is claimed is:

1. An air data probe comprising:
a pitot probe having a mounting base or flange, support strut, and tube with a forward facing inlet that is configured to capture a total pressure of the surrounding air;
at least three dams placed within the tube of the pitot probe for blocking the ballistic trajectory of water droplets or ice crystals from passing directly through the tube to a downstream pressure sensing element;
a heater element integrated into the tube of the pitot probe on the outside of the dams; and
wherein the at least three dams are oriented within the tube of the pitot probe in such a way that the dam locations are configured for two or more installations of the air data probe.

2. The air data probe of claim 1 , wherein
at least one of the at least three dams is positioned to provide a barrier to the flow of water or ice crystals along the bottom of the pitot probe when the air data probe is installed in a first orientation, wherein the at least one of the dams has a shape that blocks some of the internal flow path of the pitot probe, and
at least one other of the at least three dams is positioned to provide a barrier to the flow of water or ice crystals along the bottom of the pitot probe when the air data probe is installed in a second, different orientation, wherein the at least one other of the at least three dams has a shape that blocks some of the internal flow path of the pitot probe.

3. The air data probe of claim 1 , and further including at least two drain holes, each of the at least two drain holes located in a position that is approximately in the bottom of the pitot probe for a respective installation of the air data probe.

4. The air data probe of claim 1 , wherein each dam of the at least three dams has a semicircular shape.

5. The air data probe of claim 1 , wherein the at least three dams comprises four dams with a first pair of dams configured for a first installation and a second pair of dams configured for a second installation.

6. The air data probe of claim 5 , wherein the first pair of dams includes a first forward dam that is located in a top half of the pitot probe and a first rear dam that is located in a bottom half of the pitot probe in the first installation.

7. The air data probe of claim 6 , wherein the second pair of dams includes a second forward dam that is located in a top half of the pitot probe and a second rear dam that is located in a bottom half of the pitot probe in the second installation.

8. The air data probe of claim 5 , wherein the first pair of dams is offset from the second pair of dams by approximately 90 degrees rotation within the pitot probe.

9. The air data probe of claim 7 , wherein the first and second forward dams are offset by approximately 90 degrees and the first and second rear dams are offset by approximately 90 degrees.

10. The air data probe of claim 5 , wherein the first pair of dams have a combined surface area that covers at least the cross sectional area of an internal flow path of the tube of the pitot probe.

11. A method for manufacturing an air data probe, the method comprising:
forming a pitot probe having a tube;
drilling two holes through the tube for insertion of a pair of dams, wherein at the holes are located on opposite sides of a plane that bisects the tube along a central axis of the tube;
drilling at least one additional hole through the tube at a different location from the first two holes for insertion of at least one additional dam so that the dams support at least two orientations of the air data probe;
inserting dams in each of the holes, wherein the dams are configured for blocking the ballistic trajectory of water droplets or ice crystals from passing directly through the tube to a downstream pressure sensing element;
wrapping the tube of the pitot probe with a heating coil that engages the tube of the pitot probe and each of the dams;
covering the tube of the pitot probe with a cover; and
attaching the pitot probe to a strut.

12. The method of claim 11 , wherein forming a pitot probe includes forming a channel in an exterior surface of the pitot probe to receive the heating coil.

13. The method of claim 11 , wherein drilling at least two holes and at least one additional hole comprises drilling four holes to receive two pair of dams, wherein each pair of dams is associated with a different installation of the air data probe.

14. The method of claim 13 , and further including drilling at least two drain holes in the tube of the pitot probe, each drain hole associated with one of two different installations of the air data probe.

15. The method of claim 13 , wherein drilling four holes includes:
drilling a first pair of holes for a first installation, the first pair of holes including a first upper hole and a first lower hole; and
drilling a second pair of holes for a second installation, the second pair of holes including a second upper hole and a second lower hole.

16. A pitot probe comprising:
a tube with a forward facing inlet that is configured to capture a total pressure of the surrounding air;
two pair of dams placed within the tube of the pitot probe for blocking the ballistic trajectory of water droplets or ice crystals from passing directly through the tube to a downstream pressure sensing element;
a heater element integrated into the tube of the pitot probe on the outside of the two pair of dams;
at least two drain holes formed in the tube to enable water to escape from the tube;
wherein a first pair of the two pair of dams is positioned to provide a barrier to the flow of water or ice crystals along the bottom of the tube when the pitot probe is installed in a first orientation, wherein one of the dams in the first pair of dams has a shape that blocks approximately half of the height of the internal flow path of the tube, and
wherein a second pair of the two pair of dams is positioned to provide a barrier to the flow of water or ice crystals along the bottom of the tube when the pitot probe is installed in a second, different orientation, wherein one of the dams in the second pair of dams has a shape that blocks approximately half of the height of the internal flow path of the pitot probe.

17. The pitot probe of claim 16 , wherein the first pair of dams is offset from the second pair of dams by approximately 90 degrees rotation within the tube.

18. The pitot probe of claim 16 ,
wherein the first pair of dams includes a first forward dam that is located in a top half of the tube and a first rear dam that is located in a bottom half of the tube in the first installation; and
wherein the second pair of dams includes a second forward dam that is located in a top half of the tube and a second rear dam that is located in a bottom half of the tube in the second installation.

19. The pitot probe of claim 16 , wherein the first pair of dams have a combined surface area that covers at least the cross sectional area of an internal flow path of the tube of the pitot probe.

20. The pitot probe of claim 16 , wherein each of the two drain holes located in a position that is approximately in the bottom of the tube for a respective orientation of the pitot probe.

Assignees

• Honeywell Int Inc

Inventors

• Anderson Morris G
• Payangapadan Murali Krishnan
• Venkatarayappa Narasimha Reddy
• Gordon Grant A
• Kandula Rama Sateesh Venkata

Classifications

• G01P5/165 Primary

  Arrangements or constructions of Pitot tubes · CPC title