CN113639953B - Point type heat flow sensor installation method for wind tunnel pneumatic heat test - Google Patents
Point type heat flow sensor installation method for wind tunnel pneumatic heat test Download PDFInfo
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- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
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Abstract
The invention discloses a point type heat flow sensor installation method for a wind tunnel aerodynamic heat test. The method establishes a numerical test model; calculating a heat flow value q0 of a typical region position point; setting a point type heat flow sensor mounting point; setting a mounting height error sequence of a mounting point of a point type heat flow sensor; calculating a pneumatic heat flow value sequence of a point type heat flow sensor mounting point; calculating a relative deviation sequence of the pneumatic heat flow value sequence of the mounting point of the point type heat flow sensor and the heat flow value q 0; calculating the maximum error h0 of the installation height of the point type heat flow sensor; and (4) checking the height installation error of the point type heat flow sensor of the physical test model, judging whether the installation is qualified, and rectifying and modifying until the installation is qualified. The method can reduce the installation error of the point type heat flow sensor and improve the measurement data precision of the wind tunnel pneumatic thermal test.
Description
Technical Field
The invention belongs to the technical field of ground wind tunnel test and test, and particularly relates to a point type heat flow sensor mounting method for a wind tunnel aerodynamic heat test.
Background
The accurate wind tunnel aerodynamic heat test measurement result not only provides support for aircraft thermal protection design, but also is a basis for verifying various theoretical calculation methods, but factors influencing the wind tunnel aerodynamic heat test measurement result are more, and the installation error of the heat flow sensor is one of important influence factors.
The point type heat flow sensor is arranged on the surface of the physical test model, so that the surface of the physical test model is inevitably damaged to a certain degree. Moreover, the difference in the level of the spot heat flux sensor mounting with respect to the surface of the prototype model always exists, so that the surface of the prototype model is always more or less convex or concave, that is, the mounting process error of the spot heat flux sensor causes the surface of the prototype model to have irregular roughness. The local airflow at the mounting point of the point type heat flow sensor is disturbed, the local flow field characteristic is changed, and therefore the heat flow rate of the surface of the physical test model is affected.
From the view of the flow in the boundary layer of the surface of the physical test model, each point type heat flow sensor is equivalent to a rough element, and certain disturbances are generated on the air flow, and the influence degree of the disturbances on the heat flow measurement result is closely related to the density degree of the arrangement of the point type heat flow sensors and the flow state of the flow field, and also is closely related to the height of the protrusion/depression/inclination of the point type heat flow sensors relative to the surface of the model. When the height of the point type heat flow sensor relative to the surface protrusion/recess/inclination of the model is small, disturbance attenuation is fast, and the influence on a flow field and a test result is avoided, but when the height of the point type heat flow sensor relative to the surface protrusion/recess/inclination of the model is increased to a specific height, disturbance is further amplified, and even a shunting vortex phenomenon occurs, so that the influence on a local flow field structure and a pneumatic thermal test result is avoided.
It is conceivable that the roughness caused by the mounting process error of the point type heat flow sensor has a large influence on the test result, so that not only the heat flow distribution fluctuates, but also the measured value of the heat flow value of each mounting point has a large difference from the true heat flow value of the undisturbed condition.
Currently, there is an urgent need to develop a point type heat flow sensor installation method for wind tunnel aerodynamic heat test, which can reduce installation errors.
Disclosure of Invention
The invention aims to provide a point type heat flow sensor installation method for a wind tunnel pneumatic heat test.
The invention discloses a point type heat flow sensor installation method for a wind tunnel aerodynamic heat test, which comprises the following steps:
s1, establishing a numerical test model;
establishing a numerical test model of the physical test model through CAD software;
s2, calculating a heat flow value q0 of a typical region position point;
under the condition of a wind tunnel test, calculating a flow field and an aerodynamic heat value of the numerical test model by a numerical simulation method, and obtaining flow field structure parameters of the numerical test model and a heat flow value q0 of a typical region position point on the surface of the numerical test model;
s3, setting a point type heat flow sensor mounting point;
setting a point type heat flow sensor mounting point at a typical area position point, wherein the diameter of the point type heat flow sensor mounting point is the same as the real diameter of the point type heat flow sensor;
s4, setting a mounting height error sequence of a mounting point of the point type heat flow sensor;
the mounting height error sequence of the mounting points of the point type heat flow sensor is { + -0.5 h, + -2 h, + -3 h, + -4 h, + -5 h, … }, and h is more than or equal to 0.1 and less than or equal to 0.3, wherein the sign + represents that the mounting points of the point type heat flow sensor protrude or incline upwards to be higher than the surface of the test model, and the sign represents that the mounting points of the point type heat flow sensor are sunken or incline downwards to be lower than the surface of the test model;
s5, calculating a pneumatic heat flow value sequence of a point type heat flow sensor mounting point;
calculating an aerodynamic heat flow value q corresponding to the point type heat flow sensor mounting point by a numerical simulation method according to the height error sequence to obtain an aerodynamic heat flow value sequence of the point type heat flow sensor mounting point;
s6, calculating a relative deviation sequence of the pneumatic heat flow value sequence of the mounting point of the point type heat flow sensor and the heat flow value q 0;
calculating the relative deviation B (h) = (q-q0)/q0 of the pneumatic heat flow value sequence of the installation point of the point type heat flow sensor and the heat flow value q0 according to the height error sequence to obtain the pneumatic heat flow relative deviation sequence of the installation point of the point type heat flow sensor;
s7, calculating the maximum mounting height error h0 of the point type heat flow sensor;
according to the height error sequence, calculating the absolute value abs (B (h)) of the pneumatic heat flow relative deviation of the point type heat flow sensor mounting point to obtain the pneumatic heat flow relative deviation absolute value sequence of the point type heat flow sensor mounting point, taking N which is more than or equal to 0.05 and less than or equal to 0.1, and when abs (B (h)) is more than or equal to N, taking the absolute value of the maximum value in the corresponding mounting height error sequence as the maximum mounting height error h 0;
s8, checking the height installation error of the point type heat flow sensor of the physical test model, judging whether the installation is qualified, and rectifying and modifying until the installation is qualified;
and according to the setting of the step S2, mounting a point type heat flow sensor on the surface of the material object test model, detecting the mounting error delta of the point type heat flow sensor by using a sensor mounting precision detector, wherein the point type heat flow sensor is mounted qualified when the absolute value abs (delta) of the mounting error is less than or equal to h0, and is mounted unqualified and is remounted until the point type heat flow sensor is mounted qualified.
Further, the numerical simulation method is to solve the NS equation set.
The invention discloses a point type heat flow sensor installation method for wind tunnel aerodynamic heat tests, which mainly analyzes the influence of installation errors of a point type heat flow sensor on an aerodynamic heat measurement result on a typical region position point of a numerical test model by a numerical simulation method, provides a maximum installation height error h0 of the point type heat flow sensor of the typical region position point, detects the installation height error delta of the point type heat flow sensor of the typical region position point by a sensor installation precision detector, and judges whether the installation of the point type heat flow sensor of the typical region position point is effective or not and whether the installation can be used for wind tunnel aerodynamic heat test measurement or not.
The point type heat flow sensor mounting method for the wind tunnel aerodynamic heat test can reduce mounting errors of the point type heat flow sensor and improve measurement data accuracy of the wind tunnel aerodynamic heat test.
Drawings
FIG. 1 is a flow chart of a point type heat flow sensor installation method for wind tunnel aerodynamic heat test according to the invention;
FIG. 2a is a cloud of local heat flow (0.05 mm protrusion) obtained in example 1;
FIG. 2b is a cloud of local heat flow (0.1 mm protrusion) obtained in example 1;
FIG. 2c is a local heat flux cloud (0.05 mm depression) obtained in example 1;
fig. 2d is a local heat flux cloud (0.1 mm depression) obtained in example 1.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
As shown in fig. 1, the method for installing a point type heat flow sensor for wind tunnel aerodynamic heat test of the present invention comprises the following steps:
s1, establishing a numerical test model;
establishing a numerical test model of the physical test model through CAD software;
s2, calculating a heat flow value q0 of a typical region position point;
under the condition of a wind tunnel test, calculating a flow field and an aerodynamic heat value of the numerical test model by a numerical simulation method, and obtaining flow field structure parameters of the numerical test model and a heat flow value q0 of a typical region position point on the surface of the numerical test model;
s3, setting a point type heat flow sensor mounting point;
setting a point type heat flow sensor mounting point at a typical area position point, wherein the diameter of the point type heat flow sensor mounting point is the same as the real diameter of the point type heat flow sensor;
s4, setting a mounting height error sequence of a mounting point of the point type heat flow sensor;
the mounting height error sequence of the mounting points of the point type heat flow sensor is { + -0.5 h, + -2 h, + -3 h, + -4 h, + -5 h, … }, and h is more than or equal to 0.1 and less than or equal to 0.3, wherein the sign + represents that the mounting points of the point type heat flow sensor protrude or incline upwards to be higher than the surface of the test model, and the sign represents that the mounting points of the point type heat flow sensor are sunken or incline downwards to be lower than the surface of the test model;
s5, calculating a pneumatic heat flow value sequence of a point type heat flow sensor mounting point;
calculating an aerodynamic heat flow value q corresponding to the point type heat flow sensor mounting point by a numerical simulation method according to the height error sequence to obtain an aerodynamic heat flow value sequence of the point type heat flow sensor mounting point;
s6, calculating a relative deviation sequence of the pneumatic heat flow value sequence of the mounting point of the point type heat flow sensor and the heat flow value q 0;
calculating the relative deviation B (h) = (q-q0)/q0 of the pneumatic heat flow value sequence of the installation point of the point type heat flow sensor and the heat flow value q0 according to the height error sequence to obtain the pneumatic heat flow relative deviation sequence of the installation point of the point type heat flow sensor;
s7, calculating the maximum mounting height error h0 of the point type heat flow sensor;
according to the height error sequence, calculating the absolute value abs (B (h)) of the pneumatic heat flow relative deviation of the point type heat flow sensor mounting point to obtain the pneumatic heat flow relative deviation absolute value sequence of the point type heat flow sensor mounting point, taking N which is more than or equal to 0.05 and less than or equal to 0.1, and when abs (B (h)) is more than or equal to N, taking the absolute value of the maximum value in the corresponding mounting height error sequence as the maximum mounting height error h 0;
s8, checking the height installation error of the point type heat flow sensor of the physical test model, judging whether the installation is qualified, and rectifying and modifying until the installation is qualified;
and according to the setting of the step S2, mounting a point type heat flow sensor on the surface of the material object test model, detecting the mounting error delta of the point type heat flow sensor by using a sensor mounting precision detector, wherein the point type heat flow sensor is mounted qualified when the absolute value abs (delta) of the mounting error is less than or equal to h0, and is mounted unqualified and is remounted until the point type heat flow sensor is mounted qualified.
Further, the numerical simulation method is to solve the NS equation set.
Example 1
The practical test model of the embodiment is a flat plate, and the incoming flow Mach number Ma∞=12.0, incoming flow unit reynolds number Re∞=4.03×106A typical area location point about 0.22m from the flat plate model head, a diameter of 2mm, a protrusion/depression height of 0.05mm and 0.1mm, and an angle of attack of 0 °. The obtained local heat flow cloud pictures are shown in fig. 2 a-2 d, and the obtained pneumatic heat flow value, the pneumatic heat flow value and the h0 value are shown in table 1.
As can be seen from fig. 2a to 2d, the plate is discontinuous due to the installation of the projection/recess of the analog point type heat flow sensor, so that the local heat flow has strong discontinuous distribution. It can be seen that, for the different heights of the sensor protrusion/recess, the b (h) value is obviously different, taking N =0.05, and comparative analysis shows that, when the protrusion is 0.05mm, abs (b (h)) is less than or equal to 0.05, h0=0.05mm in the area can be determined, then a sensor installation precision detector is used for detecting the installation error of the point type heat flow sensor of the flat plate in the area, and when the detection result delta is less than or equal to 0.05mm, the installation is qualified, and the method can be used for wind tunnel aerodynamic heat test measurement.
Although the embodiments of the present invention have been disclosed above, it is not limited to the applications listed in the description and the embodiments, and it can be fully applied to various hypersonic aerodynamic thermoground wind tunnel test technical fields suitable for the present invention. Additional modifications and refinements of the present invention will readily occur to those skilled in the art without departing from the principles of the present invention, and therefore the present invention is not limited to the specific details and illustrations shown and described herein without departing from the general concept defined by the claims and their equivalents.
Claims (2)
1. A point type heat flow sensor mounting method for a wind tunnel aerodynamic heat test is characterized by comprising the following steps:
s1, establishing a numerical test model;
establishing a numerical test model of the physical test model through CAD software;
s2, calculating a heat flow value q0 of a typical region position point;
under the condition of a wind tunnel test, calculating a flow field and an aerodynamic heat value of the numerical test model by a numerical simulation method, and obtaining flow field structure parameters of the numerical test model and a heat flow value q0 of a typical region position point on the surface of the numerical test model;
s3, setting a point type heat flow sensor mounting point;
setting a point type heat flow sensor mounting point at a typical area position point, wherein the diameter of the point type heat flow sensor mounting point is the same as the real diameter of the point type heat flow sensor;
s4, setting a mounting height error sequence of a mounting point of the point type heat flow sensor;
the mounting height error sequence of the mounting points of the point type heat flow sensor is { + -0.5 h, + -2 h, + -3 h, + -4 h, + -5 h, … }, and h is more than or equal to 0.1 and less than or equal to 0.3, wherein the sign + represents that the mounting points of the point type heat flow sensor protrude or incline upwards to be higher than the surface of the physical test model, and the sign-represents that the mounting points of the point type heat flow sensor are sunken or incline downwards to be lower than the surface of the physical test model;
s5, calculating a pneumatic heat flow value sequence of a point type heat flow sensor mounting point;
calculating an aerodynamic heat flow value q corresponding to the point type heat flow sensor mounting point through a numerical simulation method according to the mounting height error sequence to obtain an aerodynamic heat flow value sequence of the point type heat flow sensor mounting point;
s6, calculating a relative deviation sequence of the pneumatic heat flow value sequence of the mounting point of the point type heat flow sensor and the heat flow value q 0;
calculating the relative deviation B (h) = (q-q0)/q0 between the pneumatic heat flow value sequence of the point heat flow sensor mounting point and the heat flow value q0 according to the mounting height error sequence to obtain the pneumatic heat flow relative deviation sequence of the point heat flow sensor mounting point;
s7, calculating the maximum mounting height error h0 of the point type heat flow sensor;
calculating the absolute value abs (B (h)) of the pneumatic heat flow relative deviation of the point type heat flow sensor mounting point according to the mounting height error sequence to obtain the pneumatic heat flow relative deviation absolute value sequence of the point type heat flow sensor mounting point, taking N which is more than or equal to 0.05 and less than or equal to 0.1, and when abs (B (h)) is more than or equal to N, taking the absolute value of the maximum value in the corresponding mounting height error sequence as the maximum mounting height error h 0;
s8, checking the height installation error of the point type heat flow sensor of the physical test model, judging whether the installation is qualified, and rectifying and modifying until the installation is qualified;
and according to the setting of the step S2, mounting a point type heat flow sensor on the surface of the material object test model, detecting the mounting error delta of the point type heat flow sensor by using a sensor mounting precision detector, wherein the point type heat flow sensor is mounted qualified when the absolute value abs (delta) of the mounting error is less than or equal to h0, and is mounted unqualified and is remounted until the point type heat flow sensor is mounted qualified.
2. The spot heat flow sensor installation method for wind tunnel aerodynamic heat test according to claim 1, wherein the numerical simulation method is to solve a system of NS equations, namely a system of Navier-Stokes equations with a chinese name of the system of Navier-Stokes equations.
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| SU1509635A1 (en) * | 1987-08-17 | 1989-09-23 | Предприятие П/Я В-2942 | Heat flow sensitive element |
| JP3522408B2 (en) * | 1995-09-18 | 2004-04-26 | 富士通株式会社 | Error estimation method for CFD analysis result, error estimation device for CFD analysis result, CFD analysis method, and CFD analysis device |
| JPH10160620A (en) * | 1996-11-29 | 1998-06-19 | Ishikawajima Harima Heavy Ind Co Ltd | Flow measuring device and flow distribution measuring device using it |
| CN101294857A (en) * | 2007-04-27 | 2008-10-29 | 西北工业大学 | Heat flow meter and measuring method thereof |
| CN102645449A (en) * | 2012-04-18 | 2012-08-22 | 天津大学 | Protective heat flow meter method thermal conductivity coefficient measuring instrument for realizing vacuum insulation and thickness measurement function |
| CN109186928B (en) * | 2018-09-21 | 2020-06-23 | 中国空气动力研究与发展中心超高速空气动力研究所 | Optimization method of arc wind tunnel semi-elliptical spray pipe |
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