CN109974962A - A kind of scaling method of the effective forced area of labyrinth seal - Google Patents
A kind of scaling method of the effective forced area of labyrinth seal Download PDFInfo
- Publication number
- CN109974962A CN109974962A CN201910339457.8A CN201910339457A CN109974962A CN 109974962 A CN109974962 A CN 109974962A CN 201910339457 A CN201910339457 A CN 201910339457A CN 109974962 A CN109974962 A CN 109974962A
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- tps
- labyrinth
- nacelle
- confined space
- propulsive thrust
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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
-
- 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
- G01M9/02—Wind tunnels
- G01M9/04—Details
-
- 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
-
- 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
- G01M9/065—Measuring arrangements specially adapted for aerodynamic testing dealing with flow
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
The invention discloses a kind of scaling methods of the effective forced area of labyrinth seal, are calculated using the axial force of pressure difference and balance measurement at labyrinth gland in confined space, obtain the effective forced area of labyrinth seal；The present invention combines the indirect measurement method of aerodynamic balance measuring by applying pressure difference in labyrinth seal two sides, can accurately obtain effective forced area of labyrinth gland, improve the accuracy of TPS propulsive thrust nacelle calibration test.
Description
Technical field
The present invention relates to wind tunnel test fields, and the side of forced area is set effective more particularly to a kind of calibration labyrinth seal
Method, for the forced area of the Accurate Calibration labyrinth gland in TPS propulsive thrust nacelle calibration test, so as to accurately calculate by
It is deducted in the additional load that labyrinth gland two sides are generated there are pressure difference, and from the full payload that wind-tunnel balance measures.
Background technique
TPS propulsive thrust experimental technique is the influence that engine reverse thrust device opening is studied in wind-tunnel to aircraft aerodynamic characteristic
A kind of experimental technique.The test of TPS propulsive thrust uses TPS propulsive thrust nacelle as the simulator of actual engine nacelle.TPS
Propulsive thrust nacelle thrust performance needs to obtain by special calibration test.In calibration test, to prevent propulsive thrust nacelle
Backward jet be forwarded to nacelle air inlet, sucked again by nacelle and damage expensive TPS unit, will reversely penetrated using partition
Stream partition；The thrust of nacelle is measured by reaction balance, and to prevent balance from being influenced by partition, labyrinth is used between partition and nacelle
Sealing device sealing, plays the effect for not only sealing but also avoiding power transmission.But due to the influence of jet stream, labyrinth seal two sides exist
Pressure difference to produce additional pressure action power, and is measured by balance, so that the accuracy of thrust measurement is affected, because
This, it is necessary to the pressure action power is deducted in balance measurement load.The pressure action power of labyrinth seal depend on pressure difference and by
Power area, wherein pressure difference can be measured by pressure sensor, and forced area then measures more difficult.Common method is straight
The geometric area of labyrinth gland is picked up as forced area, the major defect of this method is, since labyrinth seal is non-connects
Touch sealing, there are the leakage of certain air, there are certain deviations for geometric area and effective forced area, so that calculating
There are deviations between obtained pressure action power and true value.
Summary of the invention
The purpose of the present invention is overcoming existing method, one kind is provided and is accurately marked in TPS propulsive thrust calibration test
The method of labyrinth gland forced area is determined, to accurately obtain the pressure action power of labyrinth gland.
To achieve the goals above, the present invention adopts the following technical scheme:
A kind of scaling method of the effective forced area of labyrinth seal, comprising the following steps:
Step 1: will be arranged in test chamber after the sealing of TPS propulsive thrust nacelle air inlet, and short in TPS propulsive thrust
Confined space is formed between cabin air inlet front space and labyrinth seal；
Step 2: the pressure values P exported inside acquisition confined space with labyrinth sealf1And Pr1And the initial value B of balance1；
Step 3: extracting the atmosphere in confined space, so that the air pressure in confined space is lower than external pressure, and waits
Stable gas pressure in confined space acquires the pressure value P inside confined space with labyrinth seal outlet againf2And Pr2And balance
Current value B2,
Step 4: calculating the difference of pressure value, and labyrinth seal two sides pressure P is calculatedfAnd Pr, by PfAnd PrThe two takes
Difference obtains pressure difference Δ P；The reading difference of balance is obtained, balance LOAD FOR formula is substituted into, obtains balance axial force Fx；
Step 5: F is usedxDivided by Δ P, the effective forced area A of labyrinth seal is calculatedeff。
In the above-mentioned technical solutions, in the step 4 and step 5: Pf=Pf2-Pf1, Pr=Pr2-Pr1, Δ P=Pf-Pr,
Fx=K (B2-B1) g,
A kind of testing equipment for realizing scaling method, it is characterised in that including the partition being arranged in wind-tunnel, the partition
On be provided with protrusion and perforative bell-mouth structure of air, TPS propulsive thrust nacelle is arranged in bell-mouth structure of air, and the TPS is counter to be pushed away
Labyrinth gland, the TPS propulsive thrust nacelle branch being arranged on reaction balance are provided between power nacelle and horn mouth
Bar support, the air inlet of the TPS propulsive thrust nacelle are provided with inner sealing plate, it is bell-mouthed on be provided with external seal cover, it is described
External seal cover, inner sealing plate constitute confined space between labyrinth gland, are provided with air-extractor outside confined space and pass through pipe
Road is connected in confined space.
In the above-mentioned technical solutions, the partition is fixedly attached on wind-tunnel inner wall, is arranged between partition and wind-tunnel inner wall
There is sealing filler.
In the above-mentioned technical solutions, the external seal cover is hollow round table structure, and open end is connect by screw with partition,
Sealing filler is provided between open end and partition.
In the above-mentioned technical solutions, TPS propulsive thrust nacelle is by being contactless between labyrinth gland and horn mouth
Connection.
In the above-mentioned technical solutions, the outlet of labyrinth gland and inner sealing plate surface layout static bole.
In the above-mentioned technical solutions, before scaling method progress, balance is loaded by loading device, checks labyrinth
Whether contacted between sealing device, if checking discovery contact, reinstall device, until no longer being connect between labyrinth gland
Until touching.
In conclusion by adopting the above-described technical solution, the beneficial effects of the present invention are:
For the accuracy for improving the nacelle calibration test of TPS propulsive thrust, need accurately to obtain TPS propulsive thrust nacelle labyrinth seal
Effective forced area.Common method is directly to take the geometric area of labyrinth gland as forced area, but the area
There are deviations between effective forced area.The present invention combines aerodynamic balance measuring by applying pressure difference in labyrinth seal two sides
Indirect measurement method, can accurately obtain effective forced area of labyrinth gland, improve TPS propulsive thrust nacelle calibration
The accuracy of test.
Detailed description of the invention
Examples of the present invention will be described by way of reference to the accompanying drawings, in which:
Fig. 1 is the schematic diagram of the effective forced area caliberating device of labyrinth seal；
Wherein: 1 is test chamber hole wall, and 2 be partition, and 3 be the pressure tap of labyrinth seal outlet, and 4 be that TPS propulsive thrust is short
Cabin, 5 be strut, and 6 be reaction balance, and 7 be labyrinth gland, and 8 be inner sealing plate, and 9 be pressure tap on inner sealing plate, and 10 be outer
Seal closure, 11 be exhaust pipe, and 12 be air exhauster.
Specific embodiment
All features disclosed in this specification or disclosed all methods or in the process the step of, in addition to mutually exclusive
Feature and/or step other than, can combine in any way.
Any feature disclosed in this specification (including any accessory claim, abstract and attached drawing), except non-specifically chatting
It states, can be replaced by other alternative features that are equivalent or have similar purpose.That is, unless specifically stated, each feature is only
It is an example in a series of equivalent or similar characteristics.
In schematic diagram as shown in Figure 1, to complete scaling method, TPS propulsive thrust nacelle, partition, strut, reaction balance,
Inner sealing plate, external seal cover, exhaust pipe, air exhauster are the necessary equipment of rating test.
The shape of partition is consistent with the cross sectional shape of wind-tunnel inner wall, and partition is fixedly attached on wind tunnel wall by frame,
Sealing filler is filled between partition and wind tunnel wall, wind-tunnel is divided into two spaces by partition.The centre bit of partition is equipped with one
A through-hole is set as the structure of cone machine hole to obtain better test effect at lead to the hole site so that the side of partition have it is convex
Frustum structure out, frustum center are perforations, so that entire frustum is bell-mouth structure of air.And TPS propulsive thrust nacelle is just arranged
In horn mouth, TPS propulsive thrust nacelle is attached with bell-mouthed interior edge by labyrinth gland, so that TPS propulsive thrust
Sealing is realized between nacelle and horn mouth, TPS propulsive thrust nacelle is attached by strut and reaction balance.TPS propulsive thrust is short
An external seal cover is arranged above bottom surface and is connected on partition towards bell-mouthed bottom surface for the air inlet in cabin, so that outer close
A closed space is constituted between sealing cover and labyrinth gland.In order to enable entire closed space is confined space, it is anti-in TPS
An inner sealing plate on the air-inlet cover of thrust nacelle, such external seal cover, labyrinth gland, between TPS propulsive thrust nacelle
Confined space is just constituted, is then connected to confined space with external air exhauster by a tracheae.Each closed position
It is provided with sealing ring.In labyrinth seal outlet and inner sealing plate surface layout static bole, by pressure-measuring pipe by pressure tap sense
The pressure received is transferred to pressure sensor, to measure its pressure values.
Realizing the effective forced area calibration of labyrinth seal using above structure, specific step is as follows:
Step 1: TPS propulsive thrust calibrating installation is mounted in test chamber, is added by loading device to balance
It carries, checks whether contact between labyrinth gland.If checking discovery contact, device is reinstalled, until labyrinth seal fills
Until no longer being contacted between setting；
Step 2: installing inner sealing plate at TPS propulsive thrust nacelle air inlet, and external seal cover is installed on partition, is formed
One include labyrinth seal, inner sealing plate, external seal cover opposite confined space, then by external seal cover exhaust pipe and
Air exhauster connection；
Step 3: the pressure tap that external seal cover and labyrinth seal export is connect by pressure-measuring pipe with pressure sensor；
Step 4: acquisition is arranged in the initial reading P of the pressure sensor of inner sealing plate and labyrinth seal outletf1And Pr1With
The initial reading B of balance1；
Step 5: opening air exhauster, will be evacuated in external seal cover lower than external atmosphere pressure, be then shut off air exhauster, until
Pressure in external seal cover is stablized；
Step 6: the final reading P of pressure sensor is acquiredf2And Pr2, balance final reading B2；
Step 7: subtracting initial reading for the final reading of pressure sensor, and labyrinth seal two sides pressure P is calculatedfAnd Pr,
The two subtracts each other to obtain pressure difference Δ P；By balance final reading B2Subtract initial reading B1, balance LOAD FOR formula is substituted into, balance is obtained
Axial force Fx；
Step 8: F is usedxDivided by Δ P, the effective forced area A of labyrinth seal is calculatedeff。
In step 4 and six, Pf1And Pf2The initial reading and final reading of pressure tap, P respectively on inner sealing plater1And Pr2Respectively
The initial reading and final reading of pressure tap are exported for labyrinth seal, unit is Pa；B1And B2For voltage value, unit is mV；
In step 7, Pf、Pr、ΔP、FxAccording to the following formula:
Pf=Pf2-Pf1(unit Pa)
Pr=Pr2-Pr1(unit Pa)
Δ P=Pf-Pr(unit Pa)
Fx=K (B2-B1) g (unit N)
K is balance coefficient, is obtained by balance calibration；G is acceleration of gravity.
In step 8, AeffIt is calculated as follows respectively:
The invention is not limited to specific embodiments above-mentioned.The present invention, which expands to, any in the present specification to be disclosed
New feature or any new combination, and disclose any new method or process the step of or any new combination.
Claims (8)
1. a kind of scaling method of the effective forced area of labyrinth seal, it is characterised in that the following steps are included:
Step 1: will be arranged in test chamber after the sealing of TPS propulsive thrust nacelle air inlet, TPS propulsive thrust nacelle air inlet
Confined space is formed between front space and labyrinth gland；
Step 2: the pressure values P inside acquisition confined space with labyrinth gland exitf1And Pr1And the initial value of balance
B1；
Step 3: extracting the atmosphere in confined space, so that the air pressure in confined space is lower than external pressure, and waits closed
Stable gas pressure in space acquires the pressure values P inside confined space with labyrinth gland exit againf2And Pr2And balance
Current value B2,
Step 4: calculating the difference of pressure values, and labyrinth seal two sides pressure P is calculatedfAnd Pr, by PfAnd PrThe two takes difference,
Obtain pressure difference Δ P；The reading difference of balance is obtained, balance LOAD FOR formula is substituted into, obtains balance axial force Fx；
Step 5: F is usedxDivided by Δ P, the effective forced area A of labyrinth seal is calculatedeff。
2. a kind of scaling method of the effective forced area of labyrinth seal according to claim 1, it is characterised in that the step
Rapid four and step 5 in: Pf=Pf2-Pf1, Pr=Pr2-Pr1, Δ P=Pf-Pr, Fx=K (B2-B1) g,
3. a kind of testing equipment for realizing scaling method as described in claim 1, it is characterised in that including being arranged in wind-tunnel
Partition, be provided on the partition protrusion and perforative bell-mouth structure of air, TPS propulsive thrust nacelle be arranged in bell-mouth structure of air
It is interior, labyrinth gland is provided between the TPS propulsive thrust nacelle and horn mouth, the TPS propulsive thrust nacelle setting exists
Strut support on reaction balance, the air inlet of the TPS propulsive thrust nacelle are provided with inner sealing plate, are provided on horn mouth outer
Seal closure, the external seal cover, inner sealing plate constitute confined space between labyrinth gland, and pumping is provided with outside confined space
Gas equipment passes through in piping connection to confined space.
4. testing equipment according to claim 3, it is characterised in that the partition is fixedly attached on wind-tunnel inner wall, partition
Sealing filler is provided between wind-tunnel inner wall.
5. testing equipment according to claim 3, it is characterised in that the external seal cover is hollow round table structure, open end
It is connect by screw with partition, sealing filler is provided between open end and partition.
6. testing equipment according to claim 3, it is characterised in that TPS propulsive thrust nacelle passes through labyrinth gland and loudspeaker
It is contactless connection between mouth.
7. testing equipment according to claim 6, it is characterised in that the outlet and inner sealing plate surface of labyrinth gland
Arrange static bole.
8. testing equipment according to claim 6, it is characterised in that before scaling method progress, by loading device to day
It is flat to be loaded, it checks whether contact between labyrinth gland, if checking discovery contact, reinstalls device, until fan
Until no longer being contacted between the sealing device of palace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910339457.8A CN109974962B (en) | 2019-04-25 | 2019-04-25 | Calibration method for effective stress area of labyrinth seal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910339457.8A CN109974962B (en) | 2019-04-25 | 2019-04-25 | Calibration method for effective stress area of labyrinth seal |
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| Publication Number | Publication Date |
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| CN109974962A true CN109974962A (en) | 2019-07-05 |
| CN109974962B CN109974962B (en) | 2023-10-13 |
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| CN201910339457.8A Active CN109974962B (en) | 2019-04-25 | 2019-04-25 | Calibration method for effective stress area of labyrinth seal |
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| CN113551866A (en) * | 2021-08-19 | 2021-10-26 | 中国空气动力研究与发展中心低速空气动力研究所 | Collision detection system and method and air intake and exhaust test detection system |
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| CN113551866A (en) * | 2021-08-19 | 2021-10-26 | 中国空气动力研究与发展中心低速空气动力研究所 | Collision detection system and method and air intake and exhaust test detection system |
| CN113551866B (en) * | 2021-08-19 | 2023-06-02 | 中国空气动力研究与发展中心低速空气动力研究所 | Collision detection system and method, and air intake and exhaust test detection system |
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| CN109974962B (en) | 2023-10-13 |
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