Total air temperature sensors

Patent metadata

Field	Value
Publication number	US-9631985-B2
Application number	US-201414184290-A
Country	US
Kind code	B2
Filing date	Feb 19, 2014
Priority date	Oct 16, 2013
Publication date	Apr 25, 2017
Grant date	Apr 25, 2017

Abstract

A total air temperature probe includes a probe body extending from a probe base to an opposed probe tip along a longitudinal axis defining a leading edge and opposed trailing edge, an interior flow passage aligned with longitudinal axis defined in probe body with an inlet defined on probe tip for fluid communication with interior flow passage, and an outlet for exhausting fluid out from interior flow passage. A sloped surface on probe tip extends from leading edge to trailing edge. A temperature sensor is mounted within interior flow passage for measuring temperature of flow through interior flow passage to determine total air temperature. Sloped surface is flush with leading edge and set in from trailing edge with respect to longitudinal axis to define a lip proximate the trailing edge. The sloped surface and lip are configured to create a high pressure region proximate inlet of interior flow passage.

First claim

What is claimed is:

1. A total air temperature probe comprising:
a probe body extending from a probe base to an opposed probe tip along a longitudinal axis and defining a leading edge and opposed trailing edge;
an interior flow passage aligned with the longitudinal axis defined in the probe body with an inlet defined on the probe tip for fluid communication of fluid into the interior flow passage, and an outlet for exhausting fluid out from the interior flow passage;
a sloped surface on an exterior of the probe tip extending from the leading edge to the trailing edge, wherein the sloped surface is flush with the leading edge and set in from the trailing edge with respect to the longitudinal axis to define a lip proximate the trailing edge, wherein the sloped surface and the lip are configured to create a high pressure region proximate the inlet of the interior flow passage; and
a temperature sensor mounted within the interior flow passage for measuring temperature of flow through the interior flow passage to determine total air temperature.

2. A total air temperature probe as recited in claim 1 , wherein the probe body has a cross-sectional shape perpendicular to the longitudinal axis that is elliptical.

3. A total air temperature probe as recited in claim 1 , wherein the interior flow passage is cylindrical.

4. A total air temperature probe as recited in claim 1 , further comprising a mounting boss and a mounting flange, operatively connecting the probe body to an engine.

5. A total air temperature probe as recited in claim 4 , wherein the mounting boss has a diameter equal to or less than 0.75 inches (1.905 cm).

6. A total air temperature probe as recited in claim 1 , further comprising:
an impact port with a port inlet defined in the leading edge of the probe and a port passage defined in the probe in fluid communication with the port inlet;
a deicing heater disposed in the probe body aft the port inlet configured to heat the port inlet and port passage by forming a heated boundary region to reduce ice buildup in the port inlet and port passage; and
a bleed passage defined in the probe body between the leading edge and the interior flow passage aligned with the longitudinal axis with a bleed inlet defined on the probe tip for fluid communication of fluid into the bleed passage, and a bleed outlet for exhausting fluid out from the bleed passage, wherein the bleed passage is configured to reduce the heat from the heated boundary region reaching the temperature sensor.

7. A total air temperature probe as recited in claim 6 , wherein the temperature sensor is positioned to substantially avoid heat from the heated boundary region from the deicing heater for reduction of deicing heater error.

8. A total air temperature probe as recited in claim 6 , wherein the bleed inlet is chevron shaped and wherein the bleed passage has a cross-sectional shape perpendicular to the longitudinal axis of a chevron.

9. A total air temperature probe as recited in claim 6 , wherein the bleed outlet extends from the bleed passage in a plane perpendicular to the longitudinal axis and in a plane at a sixty degree angle and at a thirty degree angle with respect to a major axis and a minor axis, respectively, of the cross-section of the probe body.

10. A total air temperature probe as recited in claim 6 , further comprising a thermal shield disposed between the interior flow passage and the temperature sensor.

11. A total air temperature probe as recited in claim 10 , wherein thermal shield is cylindrical and there is clearance for fluid passage between the thermal shield and the interior flow passage.

12. A total air temperature probe comprising:
a probe body extending from a probe base to an opposed probe tip along a longitudinal axis and defining a leading edge and opposed trailing edge;
an interior flow passage aligned with the longitudinal axis defined in the probe body with an inlet defined on the probe tip for fluid communication of fluid into the interior flow passage, and an outlet for exhausting fluid out from the interior flow passage;
a sloped surface on the probe tip extending from the leading edge to the trailing edge, wherein the sloped surface is flush with the leading edge and set in from the trailing edge with respect to the longitudinal axis to define a lip proximate the trailing edge, wherein the sloped surface and the lip are configured to create a high pressure region proximate the inlet of the interior flow passage;
a temperature sensor mounted within the interior flow passage for measuring temperature of flow through the interior flow passage to determine total air temperature;
an impact port with a port inlet defined in the leading edge of the probe and a port passage defined in the probe in fluid communication with the port inlet;
a deicing heater disposed in the probe body aft the port inlet configured to heat the port inlet and port passage by forming a heated boundary region to reduce ice buildup in the port inlet and port passage; and
a bleed passage defined in the probe body between the leading edge and the interior flow passage aligned with the longitudinal axis with a bleed inlet defined on the probe tip for fluid communication of fluid into the bleed passage, and a bleed outlet for exhausting fluid out from the bleed passage, wherein the bleed passage is configured to reduce the heat from the heated boundary region reaching the temperature sensor.

13. A total air temperature probe as recited in claim 12 , wherein the temperature sensor is positioned to substantially avoid heat from the heated boundary region from the deicing heater for reduction of deicing heater error.

14. A total air temperature probe as recited in claim 12 , wherein the bleed inlet is chevron shaped and wherein the bleed passage has a cross-sectional shape perpendicular to the longitudinal axis of a chevron.

15. A total air temperature probe as recited in claim 12 , wherein the bleed outlet extends from the bleed passage in a plane perpendicular to the longitudinal axis and in a plane at a sixty degree angle and at a thirty degree angle with respect to a major axis and a minor axis, respectively, of the cross-section of the probe body.

16. A total air temperature probe as recited in claim 12 , further comprising a thermal shield disposed between the interior flow passage and the temperature sensor.

17. A total air temperature probe as recited in claim 16 , wherein thermal shield is cylindrical and there is clearance for fluid passage between the thermal shield and the interior flow passage.

18. A total air temperature probe comprising:
a probe body extending from a probe base to an opposed probe tip along a longitudinal axis and defining a leading edge and opposed trailing edge, wherein the probe body is shaped as an elliptical cylinder;
a cylindrical interior flow passage aligned with the longitudinal axis defined in the probe body with an inlet defined on the probe tip for fluid communication of fluid into the interior flow passage, and an outlet for exhausting fluid out from the interior flow passage;
a pitot port with a port inlet defined in the leading edge of the probe and a cylindrical port passage defined in the probe in fluid communication with the port inlet, wherein a plurality of deicing heaters are disposed aft the port inlet and are configured to heat the port inlet and port passage forming a heated boundary region to reduce ice buildup in the port inlet and port passage;
a temperature sensor mounted within the interior flow passage for measuring temperature o

Assignees

• Rosemount Aerospace Inc

Inventors

• Herman Chad J

Classifications

• G01K13/028 Primary

  for use in total air temperature [TAT] probes · CPC title