A qcm experimental system capable of adjusting different working conditions and its adjustment method

An experimental system and adjustable technology, applied in the field of research on the characteristics of pollutants in wind tunnels, can solve the problems of changing aerodynamic data and increasing experimental costs, and achieve the effect of precise temperature adjustment and uniform heat conduction.

Active Publication Date: 2022-03-15
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In the prior art, there is no calibration for pollutants under this working condition. Due to low-temperature wind tunnel pollutants, especially water vapor frosting, the aerodynamic data changes caused by the surface inhomogeneity of the model device have caused huge experimental costs. Increase

Method used

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  • A qcm experimental system capable of adjusting different working conditions and its adjustment method
  • A qcm experimental system capable of adjusting different working conditions and its adjustment method
  • A qcm experimental system capable of adjusting different working conditions and its adjustment method

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Experimental program
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Embodiment

[0031] see figure 1 , the QCM experimental system capable of adjusting different working conditions in this embodiment includes a sealed cavity 10 , a pressure and composition adjustment unit, a temperature control unit, and a data acquisition unit 20 .

[0032] In the pressure and component adjustment unit, the high-purity gas tank 1 is used to output the gas source containing pressure flow through a secondary pressure reducing valve 2; Drainage through the four-way valve 4 to the gas chromatograph 9 for primary concentration analysis of the pressure gas; the middle branch carries out secondary concentration analysis of the pressure gas blended by the blending device 5; the back-end branch is connected to the electric heater 15 to The diverted gas from the high-purity gas tank 1 is preheated and guided to the heat exchanger 16 through the safety valve 14. The form of the heat exchanger 16 is not fixed. It is recommended to use a tube-fin heat exchanger to increase the heat ex...

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Abstract

The invention relates to a QCM experiment system capable of adjusting different working conditions and an adjusting method thereof, belonging to the technical field of wind tunnel pollutant characteristic research. It includes a sealed cavity for placing quartz crystal microbalance sensors, a pressure and composition adjustment unit, and a temperature control unit; the pressure and composition adjustment unit includes a high-purity gas tank, a desorption device, a blending device and a gas chromatograph, The desorption device removes impurities after receiving the gas from the high-purity gas tank, and divides it into three paths. The first path enters the blending device to adjust the required component concentration; the second path enters the gas chromatograph for analysis. Its gas composition; the third way introduces the temperature control unit; the temperature control unit includes a self-pressurized liquid nitrogen tank and a heat exchanger, and the heat exchanger performs a process of comparing the liquid nitrogen in the self-pressurized liquid nitrogen tank with the gas in the third way heat exchange, and lead to the bottom of the sealed cavity for heat exchange of the quartz crystal microbalance sensor.

Description

technical field [0001] The invention relates to the technical field of research on characteristics of wind tunnel pollutants, in particular to a QCM experimental system capable of adjusting different working conditions and an adjusting method thereof. Background technique [0002] Quartz Crystal Microbalance (QCM) is a new type of tiny mass detection instrument that emerged in the 1960s, and its core component is the QCM mass sensor. QCM mass sensor is a very sensitive mass sensor, its mass measurement can be accurate to the nanogram level, and it has been applied in the detection problems of physics, chemistry, biology, medicine and other disciplines. [0003] Under certain external conditions, when other substances are adsorbed on the surface of the quartz crystal oscillator, according to the principle that the frequency change of the quartz oscillator is proportional to the change in the quality of the substance attached to the crystal surface, the resonance frequency of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N5/02
CPCG01N5/02
Inventor 植晓琴胡虬钦邱利民漆映荷叶恒扬
Owner ZHEJIANG UNIV
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