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High-precision pressure measuring system with variable reference pressure

A technology of reference pressure and measurement system, applied in pressure difference measurement between multiple valves, measurement device, measurement of fluid pressure, etc., can solve problems such as slow response speed, unsuitable for measuring pressure parameters, etc. Solve the effect of low measurement accuracy and high measurement accuracy

Active Publication Date: 2018-04-27
INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Pressure is one of the most important measurements in wind tunnel experiments. It is usually measured by scanning valves or pressure sensors (absolute pressure or gauge pressure). However, high-precision scanning valves and sensors usually have slow response speeds and are not suitable for measuring dynamic changes. When the pressure parameters of the wind tunnel change in a large range, it may be necessary to replace the sensor to adapt to the change of parameters, which brings additional cost and workload to the experiment

Method used

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  • High-precision pressure measuring system with variable reference pressure

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Embodiment 1

[0050] Such as figure 1 As shown, the variable reference pressure high-precision pressure measurement system of the present invention includes several differential pressure sensors 001-004, a flow field air-inducing pipe 10, a reference pressure air-inducing pipe 20, a reference pressure chamber 30, a pressure regulating pump 40, and a regulating Pump cut-off valve 50, regulating pump exhaust pipe 55, pressure chamber exhaust valve 60, pressure chamber exhaust pipe 65, high-precision pressure gauge 70, data acquisition equipment 80, control equipment 90, etc.

[0051] The number and parameters of differential pressure sensors 001-004 can be adjusted according to actual needs. Each differential pressure sensor includes a measurement air hole and a reference pressure air hole. The two air holes are respectively connected to the flow field air pipe 10 and the reference pressure air hole. In the air pipe 20 , the pressure measured by each differential pressure sensor 001 to 004 is...

Embodiment 2

[0062] figure 1 In the implementation example 1, the pressure P in the reference pressure chamber ref The value of is preset through the control device 90. In actual operation, the following unfavorable situations may be encountered:

[0063] (1) There is a deviation between the wind tunnel operating parameters and the preset value, which will cause the dP to be too large, resulting in a high absolute measurement error of dP, resulting in a decrease in the overall measurement accuracy, and may also exceed the measurement range of the differential pressure sensor;

[0064] (2) The wind tunnel continuously blows multiple working conditions, but the pumps, valves and other components of the present invention have a relatively large operation delay, and the reference pressure adjustment time is relatively long, resulting in having to prolong the operation time of the wind tunnel, thereby increasing the cost of the experiment.

[0065] Such as figure 2 As shown, this embodiment ...

Embodiment 3

[0068] In order to measure the pressure distribution at different sections of the wind tunnel flow field at the same time, for example, in a compressor experiment, it is necessary to measure the pressure distribution of the inlet and outlet sections of the compressor at the same time, multiple reference pressure chambers can be set. Combine now image 3 and Figure 4 Describe the application of the scheme with two reference pressure chambers in a certain compressor experiment.

[0069] During the experimental test of the aerodynamic performance of the compressor, it is necessary to measure the pressure distribution of the inlet and outlet sections of the compressor respectively, and the layout of the main measuring points can be seen Figure 4 The inlet pressure probe P1 and the outlet pressure probe P2 are shown, these two types of probes correspond to the total inlet pressure P of the compressor respectively. 1t / static pressure P 1s and total compressor outlet pressure ...

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Abstract

The invention discloses a high-precision pressure measuring system with variable reference pressure. The high-precision pressure measuring system is mainly used for wind tunnel experiment measurement,and belongs to the technical field of gas pressure measurement. The high-precision pressure measuring system provides reference pressure Pref which is close to measured pressure P through a referencepressure cavity, the reference pressure Pref is measured by means of a high-precision steady-state pressure meter, and a difference value dP between P and Pref is measured by using a small-measuring-range dynamic differential pressure sensor, namely, the measured pressure is decomposed into stable reference pressure and dynamic pressure with a small absolute value, and the stable reference pressure and the dynamic pressure are measured by means of appropriate sensors and then are re-synthesized. The high-precision pressure measuring system can satisfy requirements for response frequency of dynamic pressure measurement, has high measuring precision, solves the problem of low measurement precision of a high-frequency dynamic pressure sensor, and can adjust the reference pressure to adapt toa wide measuring range scope, so as to reduce the quantity demand of the sensors.

Description

technical field [0001] The invention relates to a gas pressure measurement system, in particular to a pressure measurement system adopting a differential pressure measurement principle and with an adjustable reference pressure, which is mainly used for wind tunnel experimental measurement and belongs to the technical field of gas pressure measurement. Background technique [0002] Pressure is one of the most important measurements in wind tunnel experiments. It is usually measured by scanning valves or pressure sensors (absolute pressure or gauge pressure). However, high-precision scanning valves and sensors usually have slow response speeds and are not suitable for measuring dynamic changes. When the pressure parameters of the wind tunnel change in a large range, it may be necessary to replace the sensor to adapt to the change of parameters, which brings additional cost and workload to the experiment. [0003] The inventor noticed that the pressure tests of quite a few wind...

Claims

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Application Information

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IPC IPC(8): G01L13/00G01M9/06
CPCG01L13/00G01M9/06
Inventor 唐菲赵庆军周小勇王云飞赵巍
Owner INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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