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CN-224231123-U - Wind tunnel flow field total temperature measuring device and measuring system thereof

CN224231123UCN 224231123 UCN224231123 UCN 224231123UCN-224231123-U

Abstract

The utility model discloses a wind tunnel flow field total temperature measuring device and a measuring system thereof, wherein the measuring device comprises a stagnation chamber, a thermocouple assembly and a supporting part, a penetrating wiring channel is arranged in the supporting part, the stagnation chamber is of a cylindrical structure, one end of the stagnation chamber is an open end, the other end of the stagnation chamber is fixedly connected with the supporting part, overflow holes are circumferentially formed in the side wall, close to the supporting part, of the stagnation chamber, the thermocouple assembly comprises a first thermocouple wire and a second thermocouple wire which are different in material, the first thermocouple wire and the second thermocouple wire are arranged in channels, communicated with the wiring channel, one ends of the first thermocouple wire and the second thermocouple wire are connected to form a joint, the joint is arranged on an axis in the stagnation chamber between the open end and the overflow holes, the thermocouple assembly is fixed at the joint of the stagnation chamber and the supporting part through a fixing part, and one end of the fixing part, which is positioned in the stagnation chamber, is a closed end. The measuring device solves the technical problem that thermocouple wires are easy to damage in the prior art.

Inventors

  • LI YAO
  • ZHONG BEIJING

Assignees

  • 北京星煜空天科技有限公司

Dates

Publication Date
20260512
Application Date
20250610

Claims (10)

  1. 1. The wind tunnel flow field total temperature measuring device is characterized by comprising a stagnation chamber (1), a thermocouple assembly (2) and a supporting part (3), wherein a through wiring channel (301) is arranged in the supporting part (3); The stagnation chamber (1) is of a cylindrical structure, one end of the stagnation chamber (1) is an open end (101), the other end of the stagnation chamber (1) is fixedly connected with the supporting part (3), the stagnation chamber (1) is communicated with the wiring channel (301), and at least one overflow hole (102) is formed in the circumference of the side wall, close to the supporting part (3), of the stagnation chamber (1); The thermocouple assembly (2) comprises a first thermocouple wire (201) and a second thermocouple wire (202) which are made of different materials, and the first thermocouple wire (201) and the second thermocouple wire (202) are arranged in a channel which is communicated with the wiring channel (301) in the stagnation chamber (1); One ends of the first thermocouple wire (201) and the second thermocouple wire (202) are connected to form a joint (203), the joint (203) is arranged on the axis of the stagnation chamber (1) between the open end (101) and the overflow hole (102), and the outer ends of the first thermocouple wire (201) and the second thermocouple wire (202) are arranged along the wiring channel (301); the thermocouple assembly (2) is fixed at the joint of the stagnation chamber (1) and the supporting part (3) through the fixing part (4), and one end of the fixing part (4) positioned in the stagnation chamber (1) is a closed end.
  2. 2. The wind tunnel flow field total temperature measuring device according to claim 1, wherein the stagnation chamber (1) is a cylindrical structure, the inner diameter of the cylindrical structure is D 1 , and the distance between the joint (203) and the opening end (101) is L 1 ,L 1 ＝2D 1 ～3D 1 .
  3. 3. The wind tunnel flow field total temperature measuring device according to claim 2, wherein the distance between the overflow hole (102) and the fixing part (4) is L 2 ,L 2 ＝0.27D 1 ～0.4D 1 , and the distance between the overflow hole (102) and the joint (203) is L 3 ,L 3 ＝0.44D 1 ～0.58D 1 .
  4. 4. The wind tunnel flow field total temperature measuring device according to claim 3, wherein the overflow holes (102) are provided in a plurality, and the ratio of the sum of the areas of the overflow holes (102) to the inlet area of the open end (101) is 0.1-0.2.
  5. 5. The wind tunnel flow field total temperature measuring device according to claim 1, wherein the diameters of the first thermocouple wire (201) and the second thermocouple wire (202) are equal and are D 2 ,D 2 = 0.2-0.3 mm.
  6. 6. The wind tunnel flow field total temperature measuring device according to claim 5, wherein the diameter of the joint (203) is
  7. 7. The wind tunnel flow field total temperature measuring device according to claim 1, wherein the wall thickness of the stagnation chamber (1) is not more than 0.5mm.
  8. 8. The wind tunnel flow field total temperature measuring device according to claim 1, wherein the fixing portion (4) comprises an insulating tube (401), the insulating tube (401) is arranged in a joint of the stagnation chamber (1) and the supporting portion (3), the first thermocouple wire (201) and the second thermocouple wire (202) penetrate through the insulating tube (401), sealing glue (402) is filled in the penetrating position, and sealing glue (402) is filled between the outer wall of the insulating tube (401) and the stagnation chamber (1) and between the outer wall of the insulating tube (401) and the supporting portion (3).
  9. 9. The wind tunnel flow field total temperature measuring device according to claim 1, wherein the outer side wall of one end of the supporting part (3) connected with the stagnation chamber (1) is provided with a flow guide surface (302), the diameter of the flow guide surface (302) gradually increases along the direction away from the stagnation chamber (1), and the outer end part of the supporting part (3) is provided with a connecting piece (303).
  10. 10. The wind tunnel flow field total temperature measurement system comprises a wind tunnel device spray pipe and is characterized in that the wind tunnel flow field total temperature measurement device as claimed in any one of claims 1-9 is arranged in an outlet airflow uniform area of the wind tunnel device spray pipe, the axis of a stagnation chamber (1) is parallel to the axis of the wind tunnel device spray pipe, and the outer ends of a first thermocouple wire (201) and a second thermocouple wire (202) are connected with a data acquisition module.

Description

Wind tunnel flow field total temperature measuring device and measuring system thereof Technical Field The utility model belongs to the technical field of total air flow temperature measurement, and particularly relates to a wind tunnel flow field total air temperature measurement device and a wind tunnel flow field total air flow temperature measurement system. Background Because the working time of the high-speed pulse wind tunnel is very short, the total temperature of the flow field of the high-speed pulse wind tunnel is measured within 500ms in a short time, which is a difficult problem for calibrating the flow field of the wind tunnel. The response time of the traditional temperature sensor is generally in the second level, and can only measure the static temperature of the flow field, but can not meet the total temperature measurement requirement of the wind tunnel flow field. Chinese patent application publication No. CN108917963a discloses a head structure of a quick response high-precision total temperature thermocouple, which comprises a protective sleeve, an insulating layer, two wires made of different materials, and a coupling wire joint, wherein the windward side of the coupling wire joint comprises a plane or concave airflow stagnation structure. The invention takes the junction of the thermocouple wire as an inflow stagnation chamber, and when the thermocouple wire is installed, the thermocouple wire is perpendicular to high-temperature high-speed air flow. The thermocouple wires have larger stress area and are easy to damage in the use process. If thicker thermocouple wires are adopted to meet the strength requirement, the response time of the thermocouple wires is longer, and the use requirement is not met. Disclosure of utility model Aiming at the technical problems existing at present, the utility model aims to provide a wind tunnel flow field total temperature measuring device and a measuring system thereof, and the wind tunnel flow field total temperature measuring device can solve the technical problem that thermocouple wires are easy to damage in the prior art. In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows: A wind tunnel flow field total temperature measuring device is structurally characterized by comprising a stagnation chamber, a thermocouple assembly and a supporting portion, wherein a through wiring channel is formed in the supporting portion, the stagnation chamber is of a cylindrical structure, one end of the stagnation chamber is an open end, the other end of the stagnation chamber is fixedly connected with the supporting portion, the stagnation chamber is communicated with the wiring channel, at least one overflow hole is circumferentially formed in the side wall, close to the supporting portion, of the stagnation chamber, the thermocouple assembly comprises a first thermocouple wire and a second thermocouple wire which are different in material, the first thermocouple wire and the second thermocouple wire are arranged in the channel, in which the stagnation chamber is communicated with the wiring channel, one ends of the first thermocouple wire and the second thermocouple wire are connected to form a joint, the joint is arranged on the axis of the stagnation chamber between the open end and the overflow hole, the outer ends of the first thermocouple wire and the second thermocouple wire are arranged along the wiring channel, the thermocouple assembly is fixedly arranged at the joint of the stagnation chamber and the supporting portion through a fixing portion, and one end of the thermocouple assembly is located at the stagnation chamber. When the wind tunnel flow field total temperature measuring device is used, the measuring device is fixed in the uniform area of the air flow at the outlet of the wind tunnel equipment spray pipe, and the axial direction of the stagnation chamber is parallel to the axial direction of the wind tunnel equipment spray pipe. The outer ends of the first thermocouple wire and the second thermocouple wire are connected with a data acquisition module to form a closed loop, and the data acquisition module is an existing product and can adopt a temperature transmitter and the like. The high-speed and high-temperature air flow enters the stagnation chamber at the opening end and is discharged through the overflow hole. By the cooperation of the stagnation chamber and the overflow hole, the high-speed and high-temperature air flow forms shock waves to be stagnation at the junction position of the thermocouple wire, the air flow velocity at the stagnation position is basically 0, and the kinetic energy of the air flow is completely converted into internal energy (temperature) according to the law of conservation of energy. Because the materials of the first thermocouple wire and the second thermocouple wire are different, voltage is generated after temperature change is induced at the junction, a