CN112556917B - Method for measuring pressure by using pressure measuring device - Google Patents
Method for measuring pressure by using pressure measuring device Download PDFInfo
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- CN112556917B CN112556917B CN202110195990.9A CN202110195990A CN112556917B CN 112556917 B CN112556917 B CN 112556917B CN 202110195990 A CN202110195990 A CN 202110195990A CN 112556917 B CN112556917 B CN 112556917B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L13/00—Devices or apparatus for measuring differences of two or more fluid pressure values
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/06—Measuring arrangements specially adapted for aerodynamic testing
Abstract
The invention is suitable for the technical field of wind tunnel tests, and provides a method for measuring pressure by using a pressure measuring device, which comprises the following steps: installing the test model in an icing wind tunnel, enabling the icing wind tunnel to be in a static state, and calibrating the differential pressure sensor; the icing wind tunnel starts to wind to a target wind speed; after the wind speed in the icing wind tunnel is stable, adjusting the test model to a target elevation angle; and calculating the pressure of each measuring point on the test model. The invention can simultaneously ensure the pressure measurement safety and the measurement precision.
Description
Technical Field
The invention belongs to the technical field of wind tunnel tests, and particularly relates to a method for measuring pressure by using a pressure measuring device.
Background
The icing wind tunnel test mainly comprises an icing test and an anti-icing and anti-icing verification test, wherein the icing test is to utilize an icing wind tunnel to simulate different icing environment conditions so that the surface of an airplane component is iced and can be kept for a long time, then the characteristics of the icing appearance are extracted, analysis is carried out by combining the test conditions, and deep research is carried out, so that the icing wind tunnel test has important significance in the aspects of icing pneumatic analysis, icing protection design, icing flight operation, icing airworthiness verification and the like. However, in the icing test of the airfoil component, in the early test design process, the elevation angle obtained through simulation calculation is different from the elevation angle of a real test, and in order to obtain the ice shape meeting the requirements, an elevation angle matching step is required.
Currently, elevation matching is achieved by measuring the pressure distribution across the surface of the component. The specific operation is as follows: the elevation angle of the component is changed by utilizing the rotating mechanism, the pressure of continuous pressure measuring points on the same section of the upper surface and the lower surface of the component is measured at the same time, the pressure distribution of the section is obtained, and then the actual test elevation angle is determined by comparing the pressure distribution with the reference pressure distribution.
Therefore, in the prior art, a single-reference-end differential pressure type pressure measuring instrument is generally adopted for pressure measurement, but the structure of the airfoil component is generally asymmetric, and the pressure difference of pressure measuring points on the upper surface and the lower surface is very large along with the change of the elevation angle, so that the single-reference-end differential pressure type pressure measuring instrument with a large measuring range is required to be used in order to not damage the single-reference-end differential pressure type pressure measuring instrument; however, in order to make the surface pressure distribution of the measurement component approach the reference pressure distribution more accurately, the accuracy requirement of the icing wind tunnel test on pressure measurement is higher, and it is difficult to ensure the measurement accuracy by using a single-reference-end differential pressure type pressure measuring instrument with a larger range.
In summary, in the measurement in the prior art, it is difficult to simultaneously ensure the measurement safety and the measurement accuracy.
Disclosure of Invention
The invention aims to provide a method for measuring pressure by using a pressure measuring device, and aims to solve the technical problem that the pressure measuring safety and the measuring precision are difficult to guarantee simultaneously in the prior art.
In a first aspect, the present invention provides a method for measuring pressure by using a pressure measuring device, which includes the following steps:
step S10: installing the test model in an icing wind tunnel, enabling the icing wind tunnel to be in a static state, and calibrating the differential pressure sensor;
step S20: the icing wind tunnel starts to wind to a target wind speed;
step S30: after the wind speed in the icing wind tunnel is stable, adjusting the test model to a target elevation angle;
step S40: calculating the pressure of each measuring point on the test model;
the pressure measuring device comprises a differential pressure sensor, an absolute pressure sensor, a test model, a main three-way pipe, a first three-way pipe and a second three-way pipe;
the differential pressure sensor comprises a first row channel group and a second row channel group, wherein the first row channel group comprisesn+1A first channel, the second row of channel group comprisesm+1A second channel, wherein,nthe total number of pressure points on the upper surface of the test model,mthe total number of pressure points on the lower surface of the test model.
Optionally, the step S40 includes the following steps:
step S41: reading absolute pressure sensor, and recordingP s ；
Step S42: calculating the pressure of each pressure measuring point on the upper surface of the test model;
step S43: and calculating the pressure of each pressure measuring point on the lower surface of the test model.
Optionally, the step S42 includes the following steps:
step S421: obtaining a differential pressure value of each first channel in the first row of channel groups, wherein the first row isiThe differential pressure value of the first channel is recorded as deltaP i ；
Step S422: testing the upper surface of the model (30)iThe pressure at each pressure measurement point is recorded asP i Then calculated by the following formulaP i ：
Optionally, the step S43 includes the following steps:
step S431: obtaining a differential pressure value of each second channel in the second row of channel groups, wherein the second row of channel groups isjThe differential pressure value of the second channel is recorded as deltaP j ；
Step S432: testing the lower surface of the modeljThe pressure at each pressure measurement point is recorded asP j Then calculated by the following formulaP j ：
Alternatively, the range of the differential pressure sensor is denoted by [ 2 ]-r,r]，rThe following conditions are satisfied:
r>|max(ΔP i )|and is andr>|max(ΔP j )|。
compared with the prior art, the invention at least has the following technical effects:
1. in the pressure measuring method, when the pressure difference of each measuring point is measured, the compared reference values are the pressure values of different reference ends, and the measurement is safe and high in precision;
2. in the pressure measuring method of the present invention, the adjacent reference end and the measurement end are communicated, so that the pressure at the upper and lower surface measuring points of the test model can be calculated in an accumulation manner when the pressure value at the measuring point is calculated, and thus, 1 to EiPressure difference value and 1E to E of first channeljThe differential pressure value of the second channel is not very large, so that the measuring range of the differential pressure sensor can be selected to be small, and the measuring precision is guaranteed;
3. in the pressure measuring method, the pressure of the upper surface measuring point and the lower surface measuring point of the test model is calculated in an accumulation mode, which is equivalent to indirectly distributing the pressure of the upper surface measuring point and the lower surface measuring point of the test model, so that the measurement safety is ensured more easily.
Drawings
FIG. 1 is a schematic diagram of a differential pressure sensor provided in accordance with an embodiment of the present invention;
FIG. 2 is a schematic diagram showing the distribution of pressure measurement points on the same cross section of the test model;
fig. 3 is a schematic view of a pressure measuring device according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a pressure measuring method according to a second embodiment of the present invention;
fig. 5 is a schematic diagram of an elevation matching method according to a third embodiment of the present invention.
Detailed Description
Aspects of the present invention will be described more fully hereinafter with reference to the accompanying drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to any specific structure or function presented throughout this disclosure. Rather, these aspects are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Based on the teachings herein one skilled in the art should appreciate that the scope of the present invention is intended to encompass any aspect disclosed herein, whether alone or in combination with any other aspect of the invention to accomplish any aspect disclosed herein. For example, it may be implemented using any number of the apparatus or performing methods set forth herein. In addition, the scope of the present invention is intended to cover apparatuses or methods implemented with other structure, functionality, or structure and functionality in addition to the various aspects of the invention set forth herein. It is to be understood that any aspect disclosed herein may be embodied by one or more elements of a claim.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The terms "comprises," "comprising," and the like, as used herein, specify the presence of stated features, steps, operations, and/or modes, but do not preclude the presence or addition of one or more other features, steps, operations, or modes.
All terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. It is noted that the terms used herein should be interpreted as having a meaning that is consistent with the context of this specification and should not be interpreted in an idealized or overly formal sense.
The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments.
Example one
As shown in FIG. 1, an embodiment of the present invention provides a differential pressure sensor 10 including a first bank of channels and a second bank of channels, the first bank of channels includingn+1A first channel, the second row of channel group comprisesm+1A second channel, wherein,nthe total number of pressure points on the upper surface of the test model 30,mthe total number of pressure points on the lower surface of the test model 30;
each first channel includes a first reference end and a first measurement end, and each second channel includes a second reference end and a second measurement end.
The solid circles in fig. 1 represent reference ends and the hollow circles represent measurement ends, and for the sake of distinction, the reference ends and the measurement ends in the first channel are referred to as first reference ends and first measurement ends, and the reference ends and the measurement ends in the second channel are referred to as second reference ends and second measurement ends.
The differential pressure value between the first measuring end and the first reference end in each first channel can be obtained by the differential pressure sensor 10, and the differential pressure value between the second measuring end and the second reference end in each second channel can also be obtained by the differential pressure sensor 10.
As shown in fig. 2, a distribution diagram of pressure measurement points on the same cross section of the test model 30 is shown, and the pressure measurement points include three parts: the pressure measuring points at the stagnation point, the pressure measuring points on the upper surface and the pressure measuring points on the lower surface are positioned at two sides of the pressure measuring points at the stagnation point, and the total number of the pressure measuring points on the upper surface and the total number of the pressure measuring points on the lower surface can be equal or unequal, and is determined according to the actual structural form of the test model 30.
By using the differential pressure sensor 10 and combining the pressure measurement method in the second embodiment, the pressure value of each measurement point on the test model 30 can be obtained.
Further, as shown in fig. 3, a first embodiment of the present invention further provides a pressure measuring device, which includes the differential pressure sensor 10 as described above, and further includes an absolute pressure sensor 20, a test model 30, a main three-way pipe 40, a first three-way pipe 50, and a second three-way pipe 60, wherein:
first, the1The first reference end of each first channel is connected to the first pipe of the main tee 40, the second1The second reference end of each second channel is connected with the second pipe of the main three-way pipe 40, the pressure measuring point at the stagnation point of the test model 30 is connected with the third pipe of the main three-way pipe 40, and the absolute pressure sensor 20 is connected to the third pipe of the main three-way pipe 40;
first, theiA first measuring end and a second measuring end of the first channeliThe first pipe connection of the three-way pipe I50i+1A first reference terminal and a second reference terminal of the first channeliSecond pipe connection of the three-way pipe 50, second of the upper surface of the test model 30iA pressure measuring point and the secondiThe third pipe of each tee pipe one 50 is connected, wherein,ithe serial numbers of the first channel, the upper surface pressure measuring point of the test model 30 and the three-way pipe I50 are more than or equal to 1i≤n；
First, thejA second measuring end of the second channel and a secondjThe first pipe of the three-way pipe II 60 is connected withj+1A second reference terminal and a second channeljSecond pipe connection of the three-way pipe 60, second of the lower surface of the test model 30jA pressure measuring point and the secondjThe third pipe of the second tee 60 is connected, wherein,jthe serial numbers of the second channel, the lower surface pressure measuring point of the test model 30 and the three-way pipe II 60 are more than or equal to 1j≤m。
Further, the differential pressure sensor system further comprises a differential pressure sensor host 70 and a pressure measuring host 80, wherein the differential pressure sensor 10 is in communication connection with the differential pressure sensor host 70, and the differential pressure sensor host 70 is in communication connection with the pressure measuring host 80.
The data in the differential pressure sensor 10 can be read by the differential pressure sensor host 70, and the data in the differential pressure sensor 10 can be digitized by the pressure measurement host 80, so that the pressure difference value between the first measuring end and the first reference end in each first channel can be obtained, and the pressure difference value between the second measuring end and the second reference end in each second channel can be obtained.
In the prior art, because only 1 reference end is provided, when the differential pressure of each measuring point is measured, compared reference values are pressure values of the same reference end, and the actual pressure of each measuring point is different, so that a larger measuring range is required to be selected for ensuring the measurement safety, and the larger measuring range inevitably reduces the measurement precision;
in the first embodiment of the present invention, each first channel includes a first reference end and a first measurement end, each second channel includes a second reference end and a second measurement end, and the first row of channels includesn+1A first channel, the second row of channel group comprisesm+1The second channel is used for measuring the pressure difference of each measuring point, compared reference values are pressure values of different reference ends, and the measurement is safe and high in precision;
and the adjacent reference end and the measuring end are communicated by means of the three-way pipe, so that when the pressure values of the measuring points are calculated, the pressures of the upper and lower surface measuring points of the test model can be calculated in an accumulation manner, and therefore, the 1 st to the up to the downiPressure difference value and 1E to E of first channeljThe differential pressure value of the second channel is not very large, so that the measuring range of the differential pressure sensor can be selected to be small, and the measuring precision is guaranteed; on the other hand, the pressure of the upper surface measuring point and the lower surface measuring point of the test model is calculated in an accumulation mode, which is equivalent to indirectly distributing the pressure of the upper surface measuring point and the lower surface measuring point of the test model, so that the measurement safety is ensured more easily.
Example two
As shown in fig. 4, a second embodiment of the present invention provides a pressure measurement method, where the pressure measurement method uses a pressure measurement device to measure pressure, and the pressure measurement device includes a differential pressure sensor 10, an absolute pressure sensor 20, a test model 30, a main three-way pipe 40, a first three-way pipe 50, and a second three-way pipe 60, where:
the differential pressure sensor 10 includes a first bank of passages includingn+ 1A first channel, the second row of channel group comprisesm+1A second channel, wherein,nthe total number of pressure points on the upper surface of the test model 30,mthe total number of pressure points on the lower surface of the test model 30; each first channel includes a first reference end and a first measurement end,each second channel comprises a second reference end and a second measuring end;
first, the1The first reference end of each first channel is connected to the first pipe of the main tee 40, the second1The second reference end of each second channel is connected with the second pipe of the main three-way pipe 40, the pressure measuring point at the stagnation point of the test model 30 is connected with the third pipe of the main three-way pipe 40, and the absolute pressure sensor 20 is connected to the third pipe of the main three-way pipe 40;
first, theiA first measuring end and a second measuring end of the first channeliThe first pipe connection of the three-way pipe I50i+1A first reference terminal and a second reference terminal of the first channeliSecond pipe connection of the three-way pipe 50, second of the upper surface of the test model 30iA pressure measuring point and the secondiThe third pipe of each tee pipe one 50 is connected, wherein,ithe serial numbers of the first channel, the upper surface pressure measuring point of the test model 30 and the three-way pipe I50 are more than or equal to 1i≤n；
First, thejA second measuring end of the second channel and a secondjThe first pipe of the three-way pipe II 60 is connected withj+1A second reference terminal and a second channeljSecond pipe connection of the three-way pipe 60, second of the lower surface of the test model 30jA pressure measuring point and the secondjThe third pipe of the second tee 60 is connected, wherein,jthe serial numbers of the second channel, the lower surface pressure measuring point of the test model 30 and the three-way pipe II 60 are more than or equal to 1j≤m；
Which comprises the following steps:
step S10: installing the test model 30 in the icing wind tunnel, enabling the icing wind tunnel to be in a static state, and calibrating the differential pressure sensor 10;
step S20: the icing wind tunnel starts to wind to a target wind speed;
step S30: after the wind speed in the icing wind tunnel is stable, adjusting the test model 30 to a target elevation angle;
step S40: the pressure at each point on the test model 30 is calculated.
Further, the step S40 includes the following steps:
step S41: reading of the absolute pressure sensor 20 is taken and recordedP s ；
Will be firstiThe pressure value at the first reference end of the first channel is recorded asP ref1-i To be connected tojThe pressure value of the second reference end of the second channel is recorded asP ref2-j The pressure value of the pressure measurement point at the stationary point of the test model 30 is recorded asP z ；
Due to the fact that1The first reference end of each first channel is connected to the first pipe of the main tee 40, the second1The second reference end of each second channel is connected to the second pipe of the main tee 40, the pressure point at the stagnation point of the test model 30 is connected to the third pipe of the main tee 40, and the absolute pressure sensor 20 is connected to the third pipe of the main tee 40, so that the reading of the absolute pressure sensor 20 and the reading of the second pipe are detected1A pressure value of a first reference end of the first channelP ref1-1 The first step1Pressure value of second reference end of second channelP ref2-1 Pressure value of pressure measurement point at stagnation point of test model 30P z Are all equal, i.e. areP s =P ref1-1 =P ref2-1 =P z ；
Step S42: calculating the pressure of each pressure measurement point on the upper surface of the test model 30;
step S43: the pressure at each pressure measurement point of the lower surface of the test model 30 is calculated.
Further, the step S42 includes the following steps:
step S421: obtaining a differential pressure value of each first channel in the first row of channel groups, wherein the first row isiThe differential pressure value of the first channel is recorded as deltaP i ；
Will be firstiThe pressure value at the first measuring end of the first channel is recorded asP mea1-i Then, the following relationship is satisfied: deltaP i =P mea1-i -P ref1-i ；
Step S422: test the second surface of the upper surface of the model 30iThe pressure at each pressure measurement point is recorded asP i Then pass throughCalculated by the following formulaP i ：
The derivation principle is as follows: due to the fact thatiA first measuring end and a second measuring end of the first channeliThe first pipe connection of the three-way pipe I50i+1A first reference terminal and a second reference terminal of the first channeliSecond pipe connection of the three-way pipe 50, second of the upper surface of the test model 30iA pressure measuring point and the secondiThe third pipes of the three-way pipe 50 are connected, and thus, the third pipe of the upper surface of the test mold 30iPressure of pressure measuring pointP i The first stepiPressure value of first measuring end of first channelP mea1-i The first stepi+1The pressure value at the first reference end of the first channel is recorded asP ref1-i+1 Are all equal, i.e. areP i =P mea1-i =P ref1-i+1 (ii) a And ΔP i =P mea1-i -P ref1-i That is to say that the first and second electrodes,P mea1-i =ΔP i +P ref1-i thus:
whileP ref1-1 =P s And therefore, the first and second electrodes are,
。
in the second embodiment of the present invention, the first surface of the test model 30 is calculatediWhen measuring the pressure of pressure points, the 1 st to the up to the downiThe differential pressure values of the first channels are accumulated, thus, 1 st to eiThe pressure differential value of each first channel is not very large, and the range of the differential pressure sensor 10 is smaller than the pressure differential value of each first channel, therefore, the range of the differential pressure sensor 10 in the present invention is smallCan be chosen smaller.
Further, the step S43 includes the following steps:
step S431: obtaining a differential pressure value of each second channel in the second row of channel groups, wherein the second row of channel groups isjThe differential pressure value of the second channel is recorded as deltaP j ；
Will be firstjThe pressure value at the second measuring end of the second channel is recordedP mea2-j Then, the following relationship is satisfied: deltaP j =P mea2-j -P ref2-j ；
Step S432: test the second surface of the lower surface of the model 30jThe pressure at each pressure measurement point is recorded asP j Then calculated by the following formulaP j ：
The derivation principle is as follows: first, thejA second measuring end of the second channel and a secondjThe first pipe of the three-way pipe II 60 is connected withj+1A second reference terminal and a second channeljSecond pipe connection of the three-way pipe 60, second of the lower surface of the test model 30jA pressure measuring point and the secondjThe third pipes of the three-way pipe two 60 are connected, and thus, the third pipe of the lower surface of the test model 30jPressure of pressure measuring pointP j The first stepjPressure value of the second measuring end of the second channelP mea2-j The first stepj+1The pressure value of the second reference end of the second channel is recorded asP ref2-j+1 Are all equal, i.e. areP j =P mea2-j =P ref2-j+1 (ii) a And ΔP j =P mea2-j -P ref2-j That is to say that the first and second electrodes,P mea2-j =ΔP j +P ref2-j thus:
whileP ref2-1 =P s And therefore, the first and second electrodes are,
。
in the second embodiment of the present invention, the first step of calculating the lower surface of the test model 30jWhen measuring the pressure of pressure points, the 1 st to the up to the downjThe differential pressure values of the second channels are accumulated, thus, 1 st to ejThe pressure differential value of each second channel is not very large, and the range of the differential pressure sensor 10 is smaller than the pressure differential value of each second channel, so the range of the differential pressure sensor 10 in the invention can be selected to be smaller.
Specifically, the range of the differential pressure sensor 10 is denoted by [ solution ]-r,r]，rThe following conditions are satisfied:
r>|max(ΔP i )|and is andr>|max(ΔP j )|。
in the present invention, the 1 st to up to one, because the pressure at the upper and lower surface measuring points of the test model is calculated by accumulationiPressure difference value and 1E to E of first channeljThe differential pressure value of the second channel is not very large, so that the measuring range of the differential pressure sensor can be selected to be small, and the measuring precision is guaranteed; on the other hand, the pressure of the upper surface measuring point and the lower surface measuring point of the test model is calculated in an accumulation mode, which is equivalent to indirectly distributing the pressure of the upper surface measuring point and the lower surface measuring point of the test model, so that the measurement safety is ensured more easily.
EXAMPLE III
As shown in fig. 5, a third embodiment of the present invention provides an elevation matching method, which uses the measurement device in the first embodiment to measure pressure, and includes the following steps:
step S10: installing the test model 30 in the icing wind tunnel, enabling the icing wind tunnel to be in a static state, and calibrating the differential pressure sensor 10;
step S20: the icing wind tunnel starts to wind to a target wind speed;
step S30: after the wind speed in the icing wind tunnel is stable, adjusting the test model 30 to a target elevation angle;
step S40: calculating the pressure of each measuring point on the test model 30;
step S50: the pressure at each measurement point on the test model 30 in step S40 is compared with the reference pressure distribution to determine the actual elevation angle of the test model 30.
Steps S10 to S40 in the third embodiment of the present invention are the same as steps S10 to S40 in the second embodiment of the present invention, and are not described herein again.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (2)
1. A method of measuring pressure using a pressure measuring device comprising a differential pressure sensor (10), an absolute pressure sensor (20), a test model (30), a main three-way pipe (40), a first three-way pipe (50), a second three-way pipe (60), wherein:
the differential pressure sensor (10) includes a first row of passages and a second row of passages, the first row of passages includingn+1A first channel, the second row of channel group comprisesm+1A second channel, wherein,nthe total number of pressure points on the upper surface of the test model (30),mthe total number of pressure points on the lower surface of the test model (30); each first channel comprises a first reference end and a first measuring end, and each second channel comprises a second reference end and a second measuring end;
first, the1The first reference end of each first channel is connected with a first pipe of a main three-way pipe (40)1The second reference end of each second channel is connected with the second pipe of the main three-way pipe (40), the pressure measuring point at the stagnation point of the test model (30) is connected with the third pipe of the main three-way pipe (40), and the absolute pressure sensor (20) is connected with the third pipe of the main three-way pipe (40)A third tube;
first, theiA first measuring end and a second measuring end of the first channeliThe first pipe connection of the three-way pipe I (50) isi+1A first reference terminal and a second reference terminal of the first channeliA second pipe connection of the three-way pipe I (50) and a second pipe connection of the upper surface of the test model (30)iA pressure measuring point and the secondiThe third pipe of the three-way pipe I (50) is connected, wherein,ithe serial numbers of the first channel, the upper surface pressure measuring point of the test model (30) and the three-way pipe I (50) are more than or equal to 1i≤n；
First, thejA second measuring end of the second channel and a secondjThe first pipe of the three-way pipe II (60) is connected withj+1A second reference terminal and a second channeljThe second pipe connection of the three-way pipe II (60) and the second pipe connection of the lower surface of the test model (30)jA pressure measuring point and the secondjThe third pipes of the three-way pipes II (60) are connected, wherein,jthe serial numbers of the second channel, the lower surface pressure measuring point of the test model (30) and the three-way pipe II (60) are more than or equal to 1j≤mThe method is characterized by comprising the following steps:
step S10: the method comprises the following steps of (1) installing a test model (30) in an icing wind tunnel, enabling the icing wind tunnel to be in a static state, and calibrating a differential pressure sensor (10);
step S20: the icing wind tunnel starts to wind to a target wind speed;
step S30: after the wind speed in the icing wind tunnel is stable, adjusting the test model (30) to a target elevation angle;
step S40: calculating the pressure of each measuring point on the test model (30);
the step S40 includes the following steps:
step S41: reading the absolute pressure sensor (20) and recording the readingP s ；
Step S42: calculating the pressure of each pressure measurement point on the upper surface of the test model (30);
step S43: calculating the pressure of each pressure measuring point on the lower surface of the test model (30);
the step S42 includes the following steps:
step S421: obtaining a differential pressure value of each first channel in the first row of channel groups, wherein the first row isiThe differential pressure value of the first channel is recorded as deltaP i ；
Step S422: testing the upper surface of the model (30)iThe pressure at each pressure measurement point is recorded asP i Then calculated by the following formulaP i ：
The step S43 includes the following steps:
step S431: obtaining a differential pressure value of each second channel in the second row of channel groups, wherein the second row of channel groups isjThe differential pressure value of the second channel is recorded as deltaP j ；
Step S432: testing the lower surface of the model (30)jThe pressure at each pressure measurement point is recorded asP j Then calculated by the following formulaP j ：
2. The method for measuring pressure using a pressure measuring device according to claim 1, wherein the measurement range of the differential pressure sensor (10) is designated by "[ solution ], [ solution ]-r,r]，rThe following conditions are satisfied:
r>|max(ΔP i )|and is andr>|max(ΔP j )|。
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