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Air-breathing fiber-optic Perth total temperature probe and its measurement system

An air-breathing, fiber-optic technology, applied in the field of air-breathing fiber-optic total temperature probe and its measurement system, can solve the problems of large temperature sensing area of ​​the probe, difficulty in adapting to high-speed dynamic temperature measurement, and large heat capacity. Achieve the effects of reducing the force section, improving the temperature measurement speed and test accuracy, and high temperature response speed

Active Publication Date: 2022-06-07
CHONGQING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The temperature-sensing area of ​​the probe with this structure is relatively large, resulting in a large heat capacity, which makes it difficult to meet the needs of high-speed dynamic temperature measurement. Targeted improvements must be made to meet the test requirements of the above-mentioned special application environments.

Method used

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  • Air-breathing fiber-optic Perth total temperature probe and its measurement system
  • Air-breathing fiber-optic Perth total temperature probe and its measurement system
  • Air-breathing fiber-optic Perth total temperature probe and its measurement system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] This embodiment discloses an air-breathing fiber-optic Fa-Pert total temperature probe applied to an aero-engine inner flow channel, see Figure 1 to Figure 3 , including L-shaped pipe, fiber optic Faber sensor 3, Faber supporting steel pipe 4 and vacuum pump.

[0035] The L-shaped duct includes an air inlet 1 and an air intake pipe 2 .

[0036] The upper end of the air inlet 1 is open, and the air inlet 1 has a steady flow passage 101 , a converging passage 102 , a throat 103 and an expansion passage 104 in sequence from top to bottom.

[0037] The air intake pipe 2 is connected downstream of the intake port 1 and communicated with the expansion passage 104 of the intake port 1, and the two form an L-shaped pipe structure.

[0038] The head of the Faber supporting steel pipe 4 protrudes into the converging channel 102 of the air intake 1 , the lower end of which passes through the expanding channel 104 of the air intake 1 , and passes through the head of the air intak...

Embodiment 2

[0047] This embodiment provides a relatively basic implementation manner, an air-breathing fiber optic Faroese total temperature probe, see Figure 1 to Figure 3 , including L-shaped pipe, fiber optic Faber sensor 3, Faber supporting steel pipe 4 and vacuum pump.

[0048] The L-shaped duct includes an air inlet 1 and an air intake pipe 2 .

[0049] The upper end of the air inlet 1 is open, and the air inlet 1 has a steady flow passage 101 , a converging passage 102 , a throat 103 and an expansion passage 104 in sequence from top to bottom.

[0050] The air intake pipe 2 is connected downstream of the intake port 1 and communicated with the expansion passage 104 of the intake port 1, and the two form an L-shaped pipe structure.

[0051] The head of the Faber supporting steel pipe 4 extends into the converging channel 102 of the air inlet 1 , and the lower end protrudes from the bottom of the air inlet 1 .

[0052] The fiber optic Fa-Per sensor 3 is fixed on the Fa-Per support...

Embodiment 3

[0056] The main structure of this embodiment is the same as that of Embodiment 2. Further, refer to Figure 4 , the optical fiber Fa-Per sensor 3 includes a thermal etalon 301 , a reflective metal aluminum film 302 and an incident metal nickel film 303 .

[0057] The thermosensitive etalon 301 is a thermosensitive ZnSe etalon with a thickness of 1.5 μm, which has a high thermo-optic coefficient. The change of temperature will lead to the change of the refractive index of the etalon, which will lead to the optical path of light in the thermosensitive etalon 301 . The change.

[0058] The reflective metal aluminum film 302 is an opaque metal film with a thickness of 100 nm. The reflective metal aluminum film 302 is connected to the upper end of the thermal etalon 301 . The incident metal nickel film 303 is a semi-transparent metal film with a thickness of 10 nm. The incident metal nickel film 303 is connected to the lower end of the thermal etalon 301 .

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Abstract

The invention discloses an air-breathing fiber optic fiber optic total temperature probe and a measuring system thereof. The interior has a steady flow channel, a convergent channel, a throat and an expansion channel in sequence from top to bottom; the air induction pipe is connected to the lower end of the intake channel and communicates with the expansion channel of the intake channel; In the converging channel of the air inlet, the lower end passes through the bottom of the air inlet; the fiber optic FAP sensor is installed in the converging channel of the air inlet; when working, the air induction pipe is pumped by a vacuum pump, and the wind speed of the converging channel at the inlet of the air inlet In a relatively high-speed and stable state, when the convergent section reaches the supercritical state, the local convective heat transfer coefficient around the Fapp sensor increases to a stable value, and is not affected by the static pressure and flow velocity fluctuations of the incoming flow, thereby improving The temperature measurement speed, temperature measurement accuracy and stability of the total temperature probe.

Description

technical field [0001] The invention belongs to the technical field of temperature sensing and measurement, and in particular relates to an air-breathing optical fiber Faroese total temperature probe and a measurement system thereof. Background technique [0002] Transient temperature is an important parameter for thermodynamic analysis of high-temperature flow field and temperature-resistant devices in applications such as combustion and high-speed heat transfer. The high-speed dynamic and accurate measurement of transient temperature is useful in many fields of defense industry such as aerospace, gas turbines, and missile explosives. Crucial role. For example, in the development of aero-engines, it is necessary to conduct high-speed dynamic tests on the airflow temperature at the outlet of the intake port and between the rotor stages; in the research on weapons such as missile gas jets, ammunition explosions, and inner and outer walls of gun barrels, transient temperature ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K11/32G01K1/14G01K1/08
CPCG01K11/32G01K1/14G01K1/08
Inventor 刘显明单智超陈昱如章鹏雷小华候孟陈伟民
Owner CHONGQING UNIV
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