CN106777599A - A kind of aircraft radiation intensity similar based on yardstick calculates method - Google Patents
A kind of aircraft radiation intensity similar based on yardstick calculates method Download PDFInfo
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- CN106777599A CN106777599A CN201611094244.6A CN201611094244A CN106777599A CN 106777599 A CN106777599 A CN 106777599A CN 201611094244 A CN201611094244 A CN 201611094244A CN 106777599 A CN106777599 A CN 106777599A
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Abstract
Method is calculated the invention provides a kind of aircraft radiation intensity similar based on yardstick, initially set up M times that size is practical flight device of aircraft scale model, the temperature boundary condition and pressure boundary condition of the scale model are consistent with practical flight device, then calculate the similarity criterion formula that formula sets up radiation intensity by radiation intensityWherein Iλ,basicIt is the radiation intensity of practical flight device, Iλ,ratioIt is the radiation intensity of aircraft scale model, the radiation intensity I that formula calculates the scale model is calculated finally by radiation intensityλ,ratio, and substituted into the radiation intensity I that practical flight device is tried to achieve in the similarity criterion formulaλ,basic, the radiation intensity of practical flight device can be calculated quickly through the radiation intensity of scale model by the formula.
Description
Technical field
The present invention relates to technical field of aircraft design, more particularly to a kind of aircraft radiation intensity similar based on yardstick
Computational methods.
Background technology
At present, aircraft development only possesses simulation calculation and actual aircraft dynamic flying tests two kinds of design meanses, and
Lack the scale model measuring technology means that the schematic design phase is badly in need of, cause the radiation characteristic of aircraft can only be by true
The dynamic flying of aircraft is obtained.
The country, still in the exploratory stage, on research meanses, due to lacking checking, emulates in terms of aircraft radiation characteristic
The computational accuracy of software cannot also ensure.Because dynamic flying difficulty of test is big, spend high, efficiency low, 1 in ground test：1 mould
Type processing cost is higher, and the manufacturing cycle is more long, so less input.This causes that the development of aircraft has larger technology wind
Danger, once the radiation characteristic for finding aircraft is tested not by dynamic flying device in the Flight stage that aircraft develops the later stage
Index request can be met, no matter from time or cost, scheme change is required to pay huge cost.
The content of the invention
It is the defect for overcoming above-mentioned prior art to exist, the invention provides a kind of aircraft radiation similar based on yardstick
Strength calculation method, comprises the following steps：
Step one, sets up M times that size is practical flight device of aircraft scale model, i.e. M is to contract than ratio, the contracting
Temperature boundary condition and pressure boundary condition than model is consistent with practical flight device；
It should be noted that radiation transfer equation, boundary condition all same due to practical flight device and scale model, because
The solution of this radiation transfer equation of the rwo is also identical, it is known that the radiation on the correspondence position of practical flight device and scale model is bright
The spatial distribution of degree is identical；
Step 2, formula I is calculated by radiation intensityλ=Hλ·R2Set up the similarity criterion formula of radiation intensity：
λ is wavelength, I during radiation intensity calculates formulaλIt is radiation intensity, HλIt is radiant illumination, R is detection range, similar standard
Then I in formulaλ,basicIt is the radiation intensity of practical flight device, Iλ,ratioIt is the radiation intensity of aircraft scale model；
Formula, radiation intensity I are calculated from radiation intensityλTo square being directly proportional for detection range R, it may thus be appreciated that actual
There is the relation on dimension scale square, i.e. phase between the radiation intensity of aircraft and the radiation intensity of aircraft scale model
Like criterion formulas；
It should be noted that calculating formula by radiation intensity understands radiation intensity IλWith detection range R square in just
Than, it follows that there is one between the radiation intensity of practical flight device and the radiation intensity of scale model and put down on dimension scale
The relation of side, i.e., above-mentioned similarity criterion formula；
Step 3, the radiation intensity I that formula calculates the aircraft scale model is calculated by radiation intensityλ,ratio, and
By Iλ,ratioThe radiation intensity I of practical flight device is tried to achieve in substitution similarity criterion formulaλ,basic。
Preferably, the M values in step one are 0.5.
It should be noted that because temperature is high at the jet pipe of aircraft, therefore jet pipe is one of object of experiment, works as the present invention
When the object of the computational methods of offer is aircraft jet pipe, contracting is specially the jet size and practical flight of scale model than ratio M
The ratio between jet size of device.
The aircraft radiation intensity a kind of similar based on yardstick that the present invention is provided calculates method, is contracted by aircraft and compares mould
Type calculates the radiation intensity of practical flight device, solve condition existing for the radiation characteristic ground test of aircraft it is harsh,
The problems such as manufacture is difficult, cost is very high, checking and the iteration of scheme can be rapidly completed by similar accurate formula of surveying, and substantially reduced
Aircraft lead time and expense, improve aircraft and develop flow, reduce developing risk, are the Flight Design of schematic design phase
Technical support is provided.
Brief description of the drawings
Fig. 1 is the schematic flow sheet that radiation intensity calculates method；
Fig. 2 is testpieces surface thermocouple distribution map；
Fig. 3 is the distribution map before radiation intensity scaling of the testpieces under different search angles；
Fig. 4 is the distribution map after radiation intensity scaling of the testpieces under different search angles.
Specific embodiment
To make the purpose, technical scheme and advantage of present invention implementation clearer, below in conjunction with the embodiment of the present invention
Accompanying drawing, the technical scheme in the embodiment of the present invention is further described in more detail.In the accompanying drawings, identical from start to finish or class
As label represent same or similar element or the element with same or like function.Described embodiment is the present invention
A part of embodiment, rather than whole embodiments.Embodiment below with reference to Description of Drawings is exemplary, it is intended to used
It is of the invention in explaining, and be not considered as limiting the invention.Based on the embodiment in the present invention, ordinary skill people
The every other embodiment that member is obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
In the description of the invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", "front", "rear",
The orientation or position relationship of the instruction such as "left", "right", " vertical ", " level ", " top ", " bottom ", " interior ", " outward " are based on accompanying drawing institute
The orientation or position relationship for showing, are for only for ease of and describe of the invention and simplify description, signified rather than instruction or hint
Device or element with specific orientation, with specific azimuth configuration and operation, therefore it is not intended that must be protected to the present invention
Protect the limitation of scope.
Method is calculated to the aircraft radiation intensity a kind of similar based on yardstick that the present invention is provided below in conjunction with the accompanying drawings to enter
Row explanation.
As shown in figure 1, the invention provides a kind of aircraft radiation intensity calculating method similar based on yardstick, including with
Lower step：
Step one, sets up M times that size is practical flight device of aircraft scale model, i.e. M is to contract than ratio, the contracting
Temperature boundary condition and pressure boundary condition than model is consistent with practical flight device；
It should be noted that radiation transfer equation, boundary condition all same due to practical flight device and scale model, because
The solution of this radiation transfer equation of the rwo is also identical, it is known that the radiation on the correspondence position of practical flight device and scale model is bright
The spatial distribution of degree is identical；
Step 2, formula I is calculated by radiation intensityλ=Hλ·R2Set up the similarity criterion formula of radiation intensity：
λ is wavelength, I during radiation intensity calculates formulaλIt is radiation intensity, HλIt is radiant illumination, R is detection range, similar standard
Then I in formulaλ,basicIt is the radiation intensity of practical flight device, Iλ,ratioIt is the radiation intensity of aircraft scale model；
Formula, radiation intensity I are calculated from radiation intensityλTo square being directly proportional for detection range R, it may thus be appreciated that actual
There is the relation on dimension scale square, i.e. phase between the radiation intensity of aircraft and the radiation intensity of aircraft scale model
Like criterion formulas；
It should be noted that calculating formula by radiation intensity understands radiation intensity IλWith detection range R square in just
Than, it follows that there is one between the radiation intensity of practical flight device and the radiation intensity of scale model and put down on dimension scale
The relation of side, i.e., above-mentioned similarity criterion formula；
Step 3, the radiation intensity I that formula calculates the aircraft scale model is calculated by radiation intensityλ,ratio, and
By Iλ,ratioThe radiation intensity I of practical flight device is tried to achieve in substitution similarity criterion formulaλ,basic。
It should be noted that because temperature is high at the jet pipe of aircraft, therefore jet pipe is one of subjects, when the present invention is carried
When the object of the computational methods of confession is aircraft jet pipe, contracting is specially the jet size and practical flight device of scale model than ratio M
The ratio between jet size.
Below by specific embodiment, the present invention is described in further detail.
Specific embodiment：
By two stainless steel wing models as testpieces verify the present invention provide it is a kind of based on yardstick it is similar fly
Row device radiation intensity calculating method, a 1000mm*800mm full-scale test part for being to represent practical flight device, one is generation
The 500mm*400mm testpieces of table aircraft scale model, that is, it is 0.5, two geometries of wing testpieces to contract than ratio M
It is identical, as shown in Fig. 2 testpieces inner surface is divided into eight passages, i.e., eight regions, each region is disposed with for making
Testpieces reaches the heating wire of surface set temperature, is disposed with for measuring testpieces at some exemplary positions on testpieces surface
Whether the thermocouple of the temperature value of setting is reached.
Table one gives temperature, the setting value of wave-length coverage of full-scale test part and subscale test part, two examinations below
Test the temperature all same of part the same area, wave-length coverage also all same.
Temperature and wave-length coverage the setting table of the full-scale test part of table one and subscale test part
Table two gives the actual temperature value of the thermocouple measurement in each region of two testpieces below, and temperature survey is by temperature
Spend logging and computer to monitor this 8 temperature values of thermocouples feedback, after desired value is reached, thermocycling part can be carried out
Radiation intensity measurement.
Testpieces actual temperature value in table two is 0.92% with testpieces set temperature value worst error in table one, can be with
The measurement of radiation intensity is carried out, the measurement of radiation intensity is measured in different angles difference sensing point by fourier spectrometer
The radiation spectrum of the testpieces surface of aluminum plate with uniform temperature distribution, further integration is carried out to spectrum, and to obtain surface emissivity strong
Angle value.
The full-scale test part of table two and subscale test part actual temperature measurement result table
As shown in figure 3, radiation intensity of the measurement subscale test part under different search angles, it can be seen that although two testpieces
Temperature Distribution and temperature value all same, but the area of full-scale test part is bigger than the area of subscale test part, so two examinations
The radiation intensity value for testing part is unequal, but it is identical with the Changing Pattern of detection angle, and substantially meets cosine law,
Detection angle is detector and testpieces central point line and the angle of testpieces method phase.
Set than ratio from initial contracting, M is 0.5, then can by the similarity criterion formula of the radiation intensity set up
Know, the radiation intensity I of full-scale test partλ,basicIt is the radiation intensity I of subscale test partλ,ratio1/0.52Times, i.e., 4 times.
The radiation intensity that the aircraft scale model for measuring will finally be tested amplifies 4 times, then the spoke with full-scale test part
Penetrate intensity to be contrasted, as shown in Figure 4, it can be seen that after radiation intensity is scaled, the radiation intensity of two testpieces substantially can be again
It is combined together, illustrates that similarity criterion formula can be used for extrapolating subscale test part by the radiation intensity of full-scale test part
Radiation intensity.
The above, specific embodiment only of the invention, but protection scope of the present invention is not limited thereto, and it is any
Those familiar with the art the invention discloses technical scope in, the change or replacement that can be readily occurred in, all should
It is included within the scope of the present invention.Therefore, protection scope of the present invention should be with the scope of the claims
It is accurate.
Claims (2)
1. a kind of aircraft radiation intensity similar based on yardstick calculates method, it is characterised in that comprise the following steps：
Step one, sets up M times that size is practical flight device of aircraft scale model, the temperature boundary bar of the scale model
Part and pressure boundary condition are consistent with practical flight device；
Step 2, formula I is calculated by radiation intensityλ=Hλ·R2Set up the similarity criterion formula of radiation intensity：
λ is wavelength, I during radiation intensity calculates formulaλIt is radiation intensity, HλIt is radiant illumination, R is detection range, and similarity criterion is public
I in formulaλ,basicIt is the radiation intensity of practical flight device, Iλ,ratioIt is the radiation intensity of aircraft scale model；
Step 3, the radiation intensity I that formula calculates the scale model is calculated by radiation intensityλ,ratio, and substituted into described
The radiation intensity I of practical flight device is tried to achieve in similarity criterion formulaλ,basic。
2. the aircraft radiation intensity similar based on yardstick according to claim 1 calculates method, it is characterised in that step
M values in one are 0.5.
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| CN201611094244.6A CN106777599A (en) | 2016-11-30 | 2016-11-30 | A kind of aircraft radiation intensity similar based on yardstick calculates method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107798171A (en) * | 2017-09-28 | 2018-03-13 | 中南大学 | Train for collision experiment contracts than equivalent model construction method and its system |
| CN109977463A (en) * | 2019-02-15 | 2019-07-05 | 南京航空航天大学 | A kind of similar experiment method using scale model measurement Large-Scale Equipment infrared signature |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080249753A1 (en) * | 2006-12-11 | 2008-10-09 | U.S Of America As Represented By The Administrator Of The National Aeronautics &Space Administration | Apparatus, method and program storage device for determining high-energy neutron/ion transport to a target of interest |
| CN105806488A (en) * | 2016-03-25 | 2016-07-27 | 南京航空航天大学 | Similar experiment method for measuring infrared radiation features of large experiment through scale model |
-
2016
- 2016-11-30 CN CN201611094244.6A patent/CN106777599A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080249753A1 (en) * | 2006-12-11 | 2008-10-09 | U.S Of America As Represented By The Administrator Of The National Aeronautics &Space Administration | Apparatus, method and program storage device for determining high-energy neutron/ion transport to a target of interest |
| CN105806488A (en) * | 2016-03-25 | 2016-07-27 | 南京航空航天大学 | Similar experiment method for measuring infrared radiation features of large experiment through scale model |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107798171A (en) * | 2017-09-28 | 2018-03-13 | 中南大学 | Train for collision experiment contracts than equivalent model construction method and its system |
| CN107798171B (en) * | 2017-09-28 | 2020-12-15 | 中南大学 | Train scale equivalent model construction method and system for collision experiment |
| CN109977463A (en) * | 2019-02-15 | 2019-07-05 | 南京航空航天大学 | A kind of similar experiment method using scale model measurement Large-Scale Equipment infrared signature |
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Application publication date: 20170531 |