CN117110178A - Aircraft erosion testing method - Google Patents
Aircraft erosion testing method Download PDFInfo
- Publication number
- CN117110178A CN117110178A CN202211431882.8A CN202211431882A CN117110178A CN 117110178 A CN117110178 A CN 117110178A CN 202211431882 A CN202211431882 A CN 202211431882A CN 117110178 A CN117110178 A CN 117110178A
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- Prior art keywords
- test
- erosion
- particle
- flow
- oxyacetylene
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- 230000003628 erosive effect Effects 0.000 title claims abstract description 35
- 238000012360 testing method Methods 0.000 title claims abstract description 34
- 239000002245 particle Substances 0.000 claims abstract description 41
- 239000000463 material Substances 0.000 claims abstract description 25
- QFXZANXYUCUTQH-UHFFFAOYSA-N ethynol Chemical group OC#C QFXZANXYUCUTQH-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000002679 ablation Methods 0.000 claims abstract description 12
- 238000010998 test method Methods 0.000 claims abstract description 8
- 239000007921 spray Substances 0.000 claims description 7
- 230000003247 decreasing effect Effects 0.000 claims description 4
- 238000004088 simulation Methods 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 19
- 238000010438 heat treatment Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 230000001133 acceleration Effects 0.000 abstract description 3
- 230000009977 dual effect Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 5
- 238000009991 scouring Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 241000533950 Leucojum Species 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000003380 propellant Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
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- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Ecology (AREA)
- Environmental & Geological Engineering (AREA)
- Environmental Sciences (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
The invention belongs to the technical field of aerospace, and relates to a test method capable of simultaneously simulating material aerodynamic heat and particle erosion. The method utilizes oxyacetylene to burn to generate high-temperature and high-speed gas, and the gas passes through N 2 Acceleration AL 2 O 3 The particles are introduced into oxyacetylene flame, the particle speed is adjustable, so that the air flow on the surface of the material can simulate the aerodynamic heat and the erosion effect of the particle flow on the material under the specified flight condition. The method is characterized in that oxyacetylene is utilized to burn to generate higher heat flow conditions, particle erosion is simulated by introducing particles into flame, test conditions are consistent with flight conditions, and finally the particles are acted on the surface of a test piece. The test method solves the problems that the arc heating method has high test cost, can not work for a long time, and the engine ablation method can not simulate the erosion effect of the external structure of the aircraft; the device has the capability of accurately simulating the dual effects of aerodynamic heat load and particle erosion of the material of the aircraft under different flight conditions, and provides test conditions for aerodynamic heat erosion design of the thermal protection material of the supersonic aircraft。
Description
Technical Field
The invention belongs to the technical field of aerospace, relates to a pneumatic thermal ablation test technology of a thermal protection material, and particularly relates to a method capable of simultaneously simulating the combined action of pneumatic heat and particle erosion.
Background
When flying at high speed, the aircraft can be subjected to strong aerodynamic heat influence and erosion of particles such as raindrops, ice crystals, snowflakes and the like. In order to comprehensively check the ablation resistance and the particle erosion resistance of the aircraft thermal protection material, the thermal protection material performance test must be performed before actual flight. At present, the method capable of simulating the aerodynamic heat of the material and carrying out particle erosion test mainly comprises an arc heating method and an engine ablation method which introduce particle action.
The arc heating method is to form arc heating gas between electrodes in an arc wind tunnel by utilizing an arc heater so as to simulate the pneumatic heat flow approaching to the flying state, and introduce particles into an accelerating section behind an arc spray pipe, so that the pneumatic heat environment and the particle erosion action on the surface of a test piece are both approximate to the real situation. The method has the defects of high cost of an arc wind tunnel test, short single test time, and incapability of repeated test and long-time working test. The engine ablation method uses a solid gas generator as a gas source, and realizes particle erosion by changing the content of propellant aluminum powder and simulating the erosion state of a spray pipe by using an engine test. The method has the disadvantage that the erosion effect of the external structure under the influence of aerodynamic heat in the high-speed flight process of the aircraft cannot be simulated. Therefore, the invention provides an aircraft erosion testing method.
Disclosure of Invention
The invention provides a method for generating high-temperature and high-speed gas by using oxyacetylene combustion and using N 2 (Nitrogen) flow acceleration AL 2 O 3 The (aluminum oxide) particles are introduced into oxyacetylene flame to form an ablation test method with high-speed particle flow scouring effect, so that the thermal environment and particle scouring conditions on the surface of the material are close to the actual flight state, and the problems that the electric arc heating method is high in cost and can not be tested for a long time, and the engine ablation method is difficult to simulate the scouring effect of the external structure of the aircraft are solved.
The technical scheme of the invention is as follows:
the aircraft erosion test method comprises simulating the combined action of the aerodynamic heat of a heat-resistant material and particle erosion;
the aerodynamic heat is a simulation materialCold wall heat flow q of surface 1 ；
The particle erosion is simulated that the surface of the material is subjected to high-speed AL 2 O 3 Erosion of particles;
the combined function is to simulate the cold wall heat flow q on the surface of the material 1 And high speed AL 2 O 3 Erosion of particles.
The aerodynamic thermal parameters and the particle erosion action parameters are adjusted according to the following steps:
1) According to GJB323A-96 oxyacetylene ablation test conditions, determining oxyacetylene premixed flame flow m 1 ；
2) Determination of AL based on test requirements 2 O 3 Particle flow m 2 ；
3) Let N be 2 Flow m 3 And carrying out flow field numerical simulation on the spray head 4 and the test section 5 by a fluid mechanics calculation method to obtain cold wall heat flow q on the surface of the material 3 to be tested 1 And AL 2 O 3 Particle erosion velocity v 1 ；
4) By increasing (or decreasing) N 2 Flow m 3 Increasing (or decreasing) AL 2 O 3 Particle erosion velocity v 1 Until AL 2 O 3 Particle erosion velocity v 1 Meets the test requirement.
The invention has the advantages that the invention can simulate the ablation and erosion of the material by aerodynamic heat and high-speed particle flow at the same time, and provides a test method for the ground test of the aircraft thermal protection material. Compared with the existing arc wind tunnel heating method, the method has the advantages of low test cost, simplicity and long-time work; compared with an engine ablation method, the aerodynamic thermal ablation analysis can be effectively performed on the aircraft exterior structural material. The invention has the advantages of simple and efficient technical scheme, quick test method and low cost.
Drawings
Fig. 1 (a) is a front cross-sectional view of an oxyacetylene flame spray head.
FIG. 1 (b) is a schematic view of the port surface of an oxyacetylene flame spray head.
FIG. 1 (c) is a schematic diagram of a flame flow erosion test method (1/8 of a showerhead).
FIG. 2 (a) is a flame temperature distribution diagram of the test section in example 1.
FIG. 2 (b) is a graph of the particle velocity profile of the test piece and the surface of the test material of example 1 with the abscissa being the length (mm).
FIG. 2 (c) is a graph of the cold wall heat flux distribution at the surface of the test material of example 1, with the abscissa being the length (mm).
In the figure: 1 is oxyacetylene flame nozzle; 2 is N 2 Acceleration AL 2 O 3 A particle spout; 3 is the surface of the material to be measured; 4, spray heads; and 5 is a test section heat flow and particle mixture.
Detailed Description
The following describes the embodiments of the present invention in detail with reference to the technical proposal.
Example 1:
the cold wall heat flow of the surface of the material to be tested is simulated to be 4000kW/m 2 、AL 2 O 3 The particle erosion rate was 65 m/s. The diameter of the oxyacetylene flame nozzle is 2mm, and the axial distance between the surface of the material to be measured and the oxyacetylene flame nozzle is 10mm.
1) Determining that the oxygen flow is 1512L/h and the pressure is 400kPa according to the test conditions; acetylene flow rate is 1116L/h, pressure is 95kPa, and the ratio of the two gas flows is 1.35;
2)AL 2 O 3 the diameter of the particle nozzle is 1mm, and the particle flow is 0.5g/s;
3) Let N be 2 Flow is 0.4g/s, flow field numerical simulation is carried out by using a hydrodynamic calculation method, and the cold wall heat flow of 4150kW/m on the surface of the material 3 to be measured is obtained 2 ，AL 2 O 3 The particle erosion speed is 30m/s, and the test requirement is not met;
4) Changing N 2 The flow rate is finally determined to be 0.8g/s, and the cold wall heat flow of 4000kW/m of the surface of the material 3 to be measured is obtained 2 ，AL 2 O 3 The particle erosion speed is 65m/s, and the test requirement is met.
Claims (1)
1. An aircraft erosion test method is characterized in that:
1) According to GJB323A-96 oxyacetylene ablation test conditions, determining oxyacetylene premixed flame flow m 1 ；
2) Determination of AL based on test requirements 2 O 3 Particle flow m 2 ；
3) Let N be 2 Flow m 3 And carrying out flow field numerical simulation on the spray head 4 and the test section 5 by a fluid mechanics calculation method to obtain cold wall heat flow q on the surface of the material 3 to be tested 1 And AL 2 O 3 Particle erosion velocity v 1 ；
4) By increasing (or decreasing) the oxyacetylene flow rate m 1 Up to the cold wall heat flow q of the surface of the material to be measured 3 1 The test requirement is met;
5) By increasing (or decreasing) N 2 Flow m 3 To increase (or decrease) AL 2 O 3 Particle erosion velocity v 1 Until AL 2 O 3 Particle erosion velocity v 1 Meets the test requirement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211431882.8A CN117110178A (en) | 2022-11-10 | 2022-11-10 | Aircraft erosion testing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211431882.8A CN117110178A (en) | 2022-11-10 | 2022-11-10 | Aircraft erosion testing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117110178A true CN117110178A (en) | 2023-11-24 |
Family
ID=88800817
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211431882.8A Pending CN117110178A (en) | 2022-11-10 | 2022-11-10 | Aircraft erosion testing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117110178A (en) |
-
2022
- 2022-11-10 CN CN202211431882.8A patent/CN117110178A/en active Pending
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