CN104122030A - Method and system for measuring air flow pressure in test room - Google Patents

Abstract

The invention belongs to the technical field of metering and testing of aero-engine test beds, and relates to a method and a system for measuring air flow pressure in aero-engine test run. The method for measuring the air flow pressure in a test room comprises the following steps: acquiring the air flow pressure of a position to be measured by using a pressure probe; accessing the measuring end of a pressure scanning valve through an air guide tube; connecting the reference end of the pressure scanning valve to the output end of a pressure controller; regulating the output pressure of the pressure controller, wherein the pressure is determined in such a manner that the pressure scanning valve works in an optimal measuring range. The method and the system have the advantages that the problem concerned with the measurement of air flow pressure in an existing engine test room can be solved, the reference end pressure of the pressure scanning valve is kept constant, measured data are stable, high repeatability is realized, periodic fluctuation is prevented, and the pressure scanning valve can work in the optimal measuring range.

Description

The measuring method of stream pressure and system in a kind of test cell

Technical field

The invention belongs to aircraft engine test stand metrological testing technology field, relate to measuring method and the system of stream pressure in a kind of aeroengine test run.

Background technology

At present, in the time that aircraft engine test stand carries out test run, because a large amount of stream pressure parameters needs to measure, mostly select pressure scanning valve as measuring equipment; And carrying out between engine run inlet flow field while measuring, find that measured value has periodic variation, this is because the reference edge of pressure scanning is selected improper causing, the selection of conventional pressure scanning valve reference edge has the atmospheric pressure of pipeline enclosure, the atmospheric pressure of outside, test cell and the external pressure after surge tank, these several selections of evidence all can not obtain the most satisfied effect, because these several Reference pressures all can be along with changing to some extent in the process of test run.

Summary of the invention

The object of the invention is in order to solve between aeroengine test run in flow field survey, working pressure scanning valve is measured stream pressure the problem of fluctuation, proposes measuring method and the system of stream pressure in a kind of test cell.

The object of the invention is to be achieved through the following technical solutions.

Measuring method and the system of stream pressure in a kind of test cell the present invention relates to, comprise pressure probe (1), pressure scanning valve (2), pressure controller (3), the first pressure guiding pipe (4) and the second pressure guiding pipe (5); In described test cell, the use step of the measuring method of stream pressure and system is as follows:

Step 1: pressure probe (1) is fixed on to position to be measured in test cell, and working pressure probe (1) obtains stream pressure.

Step 2: the measuring junction that is incorporated into pressure scanning valve (2) with the stream pressure that the first pressure guiding pipe (4) obtains pressure probe (1).

Step 3: the reference edge of pressure scanning valve (2) is connected with the output terminal of pressure controller (3) with the second pressure guiding pipe (5).

Step 4: regulate the output pressure of pressure controller (3), definite principle of the output pressure of pressure controller (3) is: pressure scanning valve (2) is operated in its best range ability, is specially: P ∈ [P _bmin, P _bmax], wherein P is the output pressure of pressure controller (3); P _bminfor the lower limit of the best range ability of pressure scanning valve (2), can obtain by formula (1); P _bmaxfor the higher limit of the best range ability of pressure scanning valve (2), can obtain by formula (2).

$P_{B\min }=\frac{P_{\max }-P_{\min }}{3}---\left(1\right)$

Wherein, P _bminfor the lower limit of pressure scanning valve (2) range ability; P _bmaxfor the higher limit of pressure scanning valve (2) range ability.

$P_{B\max }=\frac{2\×(P_{\max }-P_{\min })}{3}---\left(2\right)$

Step 5: read the pressure signal of pressure scanning valve (2) output terminal, can obtain position to be measured stream pressure value in test cell.

Beneficial effect

In a kind of test cell that the present invention proposes, the measuring method of stream pressure and system compared with the prior art, have the following advantages:

1. the reference edge pressure that ensures pressure scanning valve remains unchanged, and measurement data is stable;

2. reproducible, aperiodicity fluctuation;

3. can allow pressure scanning valve be operated in its best range ability.

Brief description of the drawings

Fig. 1 is the system connection layout of the measuring system of stream pressure in the test cell in the specific embodiment of the invention;

Wherein, 1-pressure probe, 2-pressure scanning valve, 3-pressure controller, 4-the first pressure guiding pipe, 5-the second pressure guiding pipe.

Embodiment

For technical scheme of the present invention is better described, below by embodiment, the present invention will be further described.

In a kind of test cell that the present invention proposes, measuring method and the system of stream pressure, comprise pressure probe 1, pressure scanning valve 2, pressure controller 3, the first pressure guiding pipe 4 and the second pressure guiding pipe 5;

In test cell, the use step of the measuring method of stream pressure and system is as follows:

Step 1: pressure probe 1 is fixed on to position to be measured in test cell, and working pressure probe 1 obtains stream pressure.

Step 2: the measuring junction that is incorporated into pressure scanning valve 2 with the stream pressure that the first pressure guiding pipe 4 obtains pressure probe 1.

Step 3: the reference edge of pressure scanning valve 2 is connected with the output terminal of pressure controller 3 with the second pressure guiding pipe 5.

Step 4: regulate the output pressure of pressure controller 3, definite principle of the output pressure of pressure controller 3 is: pressure scanning valve 2 is operated in its best range ability, is specially: P ∈ [P _bmin, P _bmax], wherein P is the output pressure of pressure controller 3; P _bminfor the lower limit of pressure scanning valve 2 best range abilities, can obtain by formula (1); P _bmaxfor the higher limit of pressure scanning valve 2 best range abilities, can obtain by formula (2).

Step 5: read the pressure signal of pressure scanning valve 2 output terminals, can obtain position to be measured stream pressure value in test cell.

Main contents of the present invention have been done detailed introduction by above-mentioned preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.Read after foregoing those skilled in the art, for multiple amendment of the present invention and substitute will be all apparent.Therefore, protection scope of the present invention should be limited to the appended claims.

Claims (3)

1. a measuring system for stream pressure in test cell, is characterized in that: comprising: pressure probe (1), pressure scanning valve (2), pressure controller (3), the first pressure guiding pipe (4) and the second pressure guiding pipe (5); The stream pressure that the first pressure guiding pipe (4) obtains pressure probe (1) is incorporated into the measuring junction of pressure scanning valve (2); The second pressure guiding pipe (5) is connected the reference edge of pressure scanning valve (2) with the output terminal of pressure controller (3).

2. the measuring method of stream pressure and a system in test cell, is characterized in that: it uses step as follows:

Step 1: pressure probe (1) is fixed on to position to be measured in test cell, and working pressure probe (1) obtains stream pressure;

Step 2: the measuring junction that is incorporated into pressure scanning valve (2) with the stream pressure that the first pressure guiding pipe (4) obtains pressure probe (1);

Step 3: the reference edge of pressure scanning valve (2) is connected with the output terminal of pressure controller (3) with the second pressure guiding pipe (5);

Step 4: regulate the output pressure of pressure controller (3), definite principle of the output pressure of pressure controller (3) is: pressure scanning valve (2) is operated in its best range ability;

Step 5: read the pressure signal of pressure scanning valve (2) output terminal, can obtain position to be measured stream pressure value in test cell.

3. measuring method and the system of stream pressure in a kind of test cell as claimed in claim 2, it is characterized in that: described in its step 4, regulate the output pressure of pressure controller (3), the concrete control method that pressure scanning valve (2) is operated in its best range ability is:

P ∈ [P _bmin, P _bmax], wherein P is the output pressure of pressure controller (3); P _bminfor the lower limit of the best range ability of pressure scanning valve (2), can obtain by formula (1); P _bmaxfor the higher limit of the best range ability of pressure scanning valve (2), can obtain by formula (2);

$P_{B\min }=\frac{P_{\max }-P_{\min }}{3}---\left(1\right)$

Wherein, P _bminfor the lower limit of pressure scanning valve (2) range ability; P _bmaxfor the higher limit of pressure scanning valve (2) range ability;

$P_{B\max }=\frac{2\×(P_{\max }-P_{\min })}{3}.---\left(2\right)$