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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  • 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 spe

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  • High-precision pressure measuring system with variable reference pressure
  • High-precision pressure measuring system with variable reference pressure
  • High-precision pressure measuring system with variable reference pressure

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0049] Example 1

[0050] Such as figure 1 As shown, the variable reference pressure high-precision pressure measurement system of the present invention includes a number of differential pressure sensors 001 to 004, a flow field bleed tube 10, a reference pressure bleed tube 20, a reference pressure chamber 30, a pressure regulating pump 40, and a regulator Pump stop 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 1 measuring air hole and 1 reference pressure air hole. The two air holes are respectively connected to flow field air pipe 10 and reference pressure air inlet. In the air pipe 20, the pressure measured by the differential pressure sensors 001 to 004 is the p...

Example Embodiment

[0061] Example 2

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

[0063] (1) The wind tunnel operating parameters deviate from the preset values, which will cause dP to be too large, resulting in a high absolute error of dP measurement, 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 through multiple working conditions, and the pumps, valves and other components of the present invention have a relatively long operating delay, and the reference pressure adjustment time is relatively long, which leads to having to extend the operating time of the wind tunnel, thereby increasing the experimental cost.

[0065] Such as figure 2 As shown, this embodiment is further improved on the...

Example Embodiment

[0067] Example 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 compressor inlet and outlet sections at the same time, multiple reference pressure chambers can be set. Now combined image 3 versus Figure 4 Explain the application of the scheme with two reference pressure chambers in a certain compressor experiment.

[0069] When the aerodynamic performance of the compressor is tested, the pressure distribution of the compressor inlet and outlet cross-sections need to be measured separately. The layout of the main measurement points can be seen Figure 4 The inlet pressure probe P1 and the outlet pressure probe P2 shown, these two types of probes correspond to the total compressor inlet pressure P 1t / Static pressure P 1s And total compressor outlet pressure P 2t / Static pressure P 2s . It can be measure...

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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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