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Hypersonic flow field pulsating density measuring system and method

A density measurement, hypersonic technology, used in measurement devices, aerodynamic tests, and testing of machine/structural components, etc., can solve the problems that the sensor is difficult to meet the thermal load and shock load, and the sensor response frequency cannot cover the frequency band, etc. The effect of high utilization rate, easy adjustment and compact system structure

Active Publication Date: 2020-12-18
INST OF MECHANICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The measurement method of pulsating pressure is limited by the response frequency of the sensor and cannot cover all important frequency bands, and when the total temperature of the flow field is high, the sensor is difficult to meet the requirements of thermal load and impact load

Method used

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  • Hypersonic flow field pulsating density measuring system and method
  • Hypersonic flow field pulsating density measuring system and method
  • Hypersonic flow field pulsating density measuring system and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Such as figure 1 As shown, a hypersonic flow field pulsation density measurement system includes a laser energy monitoring system, an interferometry system,

[0036] More specifically, it includes a laser, a fiber coupler, a Y-shaped fiber, a fiber connector, a fiber collimator, a photodetector and a signal collector, the laser is connected to the fiber coupler,

[0037] In the laser energy monitoring system, the fiber coupler is connected through the Y-shaped optical fiber 1A, the Y-shaped optical fiber 1C and the optical fiber connector a, and the optical fiber connector a is sequentially connected through the Y-shaped optical fiber 2A, the Y-shaped optical fiber 2C and the laser energy monitoring assembly;

[0038] The interferometric measurement system includes an interferometric reference optical path and an interferometric measurement optical path,

[0039] In the measurement optical path of the interference, the fiber coupler is connected to the fiber collimator...

Embodiment 2

[0061] On the basis of Example 1, different from Example 1, such as figure 2 As shown, the measurement range of the pulsating density is calibrated by a calibration device, which includes a glass pressure ring, a calibration tube, quartz glass, a pressure / temperature sensor, and a vacuum pump. The two ends of the calibration tube are respectively provided with a glass pressure ring and a quartz The glass and the middle of the calibration tube are respectively provided with pressure / temperature sensors and vacuum pumps at certain intervals, and the pressure / temperature sensors and vacuum pumps are arranged along the direction perpendicular to the axis of the calibration tube.

[0062] Quartz glass is installed on both sides of the calibration tube to simulate the measurement area; the pressure sensor is used to record the pressure in the calibration tube; the temperature sensor is used to record the temperature in the calibration tube; the vacuum pump is used to change the pres...

Embodiment 3

[0069] On the basis of Example 1, further, a calibration device is set between the fiber collimator a and the fiber collimator b, and the measurement range of the pulsation density is calibrated by a calibration device, and the calibration device includes a glass pressure ring, a calibration tube, quartz glass, pressure / temperature sensor, and vacuum pump. The two ends of the calibration tube are respectively provided with glass pressure rings and quartz glass, and the middle of the calibration tube is respectively provided with a pressure / temperature sensor and a vacuum pump at a certain distance. Both the sensor and the vacuum pump are arranged along a direction perpendicular to the axis of the calibration tube.

[0070] A hypersonic flow field pulsation density measurement method, using the hypersonic flow field pulsation density measurement system, specifically includes the following steps:

[0071] Laser energy monitoring: the laser is transmitted through Y-shaped optical...

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Abstract

The invention discloses a hypersonic flow field pulsating density measuring system and a measuring method, laser is transmitted through Y-shaped optical fibers 1A, 1C, 2A and 2C, the output end alignsthe laser with a photoelectric detector b through an optical fiber collimator d, and the intensity of the laser output by a laser device is monitored; the laser is transmitted through the Y-shaped optical fibers 1A and 1B, and a laser signal at the output end enters a flow field test area; the optical fiber collimator b on the other side collects a laser signal and then couples the laser signal again and transmits the laser signal through the Y-shaped optical fibers 3B and 3A to form an interference measurement optical path. According to the invention, the laser is transmitted through Y-shaped optical fibers 1A, 1C, 2A, 2B, 3C and 3A to form an interference reference light path, interference is generated after measurement light meets the reference light, and the output end of the Y-shapedoptical fiber 3A aligns the laser with a photoelectric detector a through an optical fiber collimator c to measure interference signals. The measurement result of the system is directly related to the pulsation density; the sensitivity is high and the anti-interference capability is high. In addition, the structure is compact, adjustment is simple, and laser light source utilization rate is high,and hundreds of megahertz response frequency can be realized.

Description

technical field [0001] The invention belongs to the technical field of measuring equipment in a hypersonic wind tunnel, and in particular relates to a hypersonic flow field pulsation density measurement system and a measurement method. Background technique [0002] Hypersonic pulsation characteristics are an important parameter to measure the dynamic quality of wind tunnel flow field, and also a key parameter to study turbulence model and transition mechanism. Hot wire anemometers are commonly used in subsonic wind tunnels to measure fluctuating velocities, but they cannot be used in hypersonic wind tunnels due to the limitation of hot wire strength and the interference it introduces to the flow field. In a hypersonic wind tunnel, the fluctuating pressure or fluctuating density is mainly measured. The measurement method of pulsating pressure is limited by the response frequency of the sensor and cannot cover all important frequency bands, and when the total temperature of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M9/06
CPCG01M9/067
Inventor 苑朝凯姜宗林
Owner INST OF MECHANICS - CHINESE ACAD OF SCI
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