CN105277291B - A kind of combustion chamber chamber wall temperature gradiometry module - Google Patents
A kind of combustion chamber chamber wall temperature gradiometry module Download PDFInfo
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- CN105277291B CN105277291B CN201410347169.4A CN201410347169A CN105277291B CN 105277291 B CN105277291 B CN 105277291B CN 201410347169 A CN201410347169 A CN 201410347169A CN 105277291 B CN105277291 B CN 105277291B
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Abstract
The invention belongs to technical field of temperature measurement, and in particular to a kind of Liquid Rocket Engine Combustion Chambers nozzle section chamber wall temperature gradiometry module.The module is loop configuration, including annular pressing plate, 5 thermocouple sensors, spring, catch, heat insulation housing, supporting sleeves；Disc catch is welded at every thermocouple sensor temperature-sensitive end, thermocouple sensor passes through supporting sleeve and spring in the one end on catch top, supporting sleeve is inserted in spring, is inserted in annular pressing plate together, and thermocouple sensor is penetrated with lower part in heat insulation housing in catch.The present invention can measure the cooling duct interior wall construction temperature in a certain cross section of combustion chamber nozzle section, so as to obtain the parameters such as local hot-fluid, gas wall temperature, outer wall temperature.
Description
Technical field
The invention belongs to technical field of temperature measurement, and in particular to a kind of Liquid Rocket Engine Combustion Chambers nozzle section locular wall
Temperature gradient measurement module.
Background technology
Working medium in Liquid Rocket Engine Combustion Chambers is the high-pressure gas of more than 3000K, in order to avoid locular wall is burnt
Erosion destroys, and is provided with milling grooved tunnels between wall and outer wall in the combustion chamber, introduces cryogen and chamber wall structure is cooled down.
The highest heat flow density of combustion chamber nozzle section locular wall can reach MW/m2 up to a hundred, and the temperature difference that structural material is born often reaches several
Hundred more than K, and it is violent along axially different position changes of heat flux, working environment is extremely severe, is that combustion chamber is easiest to fail
Position.Therefore, it is to carry out rational heat protection design so as to ensure the reliable work in combustion chamber to find out the indoor diabatic process of thrust
One of most important premise of work or even raising engine performance.
The approach of combustion chamber diabatic process research includes heat test and simulation calculation, and the two complements each other, and key is to pass
The valuable measurement data such as hot-fluid, gas wall temperature are obtained in heat test.And since the rib width of groove milling formula cooling structure, wall thickness are very thin
(rib width is usually 1~2mm, and wall thickness generally only has 0.6~1mm), it is difficult in the structure arrangement ordinary sensors to heat flow density,
The parameters such as gas wall temperature are directly measured.
Traditional calorimetric contracting can only obtain the mean heat flux in a certain section than combustion chamber, and be shunk by burning indoor type face
The influence of expansion, the variation of hot-fluid axially displaced section is violent, and hot-fluid axially displaced section is not quite similar, and results in putting down in this way
Equal hot-fluid can not accurately reflect practical geothermal heat flow of working as, and due to using sectioned water cooling body portion, coolant side structure, heat transfer conditions
Larger with full-scale phase difference, the application error of this method measured value is larger.It although can in the method that inner wall is immersioned thermocouple
Directly to measure gas wall temperature, but the depth of the processing shallow slot due to burying thermocouple commonly reaches more than 0.5, and in this depth side
Upward structure temperature variation may be to tens K, and the gas wall temperature value accuracy measured is less high.And due to being needed when being inserted into sensor
Through-hole is processed on inside and outside wall, it is also necessary to which inner wall shallow rooved face copper electroplating layer ensures sealing, not only complex process, and easily going out
Existing defect.The measurement of previous outer wall of combustion chamber temperature be by being measured in outside wall surface spot welded hot galvanic couple, according to the actual fact,
Influenced by factors such as extraneous thermal environment, vibration environments, measurement result usually occur there are burr, distortion the problems such as.
Invention content
The purpose of the present invention is to provide a kind of Liquid Rocket Engine Combustion Chambers nozzle section chamber wall temperature gradiometry moulds
Block can measure the cooling duct interior wall construction temperature in a certain cross section of combustion chamber nozzle section, so as to obtain locality
The parameters such as hot-fluid, gas wall temperature, outer wall temperature.
In order to achieve the above objectives, the technical solution used in the present invention is：
A kind of combustion chamber chamber wall temperature gradiometry module, which is loop configuration, including annular pressing plate, 5 thermoelectricity
Even sensor, spring, catch, heat insulation housing, supporting sleeve；Disc gear is welded at every thermocouple sensor temperature-sensitive end
Piece, thermocouple sensor pass through supporting sleeve and spring in the one end on catch top, and supporting sleeve is inserted in spring, is inserted in annular together
In pressing plate, thermocouple sensor is penetrated with lower part in heat insulation housing in catch.
The annular pressing plate is partial circle plank frame, and the both ends of partial circle are radially machined with horseshoe along annulus
V notch v, gap width n is bigger than stud outer diameter, and inner side is semi-cylindrical, two notch semi-cylindrical center angle αs, each
The tapped through hole of Md3 sizes is processed on the plate body of notch the same side；5 axis folders are evenly arranged between two horseshoe v notch vs
Angle is β, the radial blind holes of a diameter of Ф d1, blind hole depth Ld1, and the bottom of each blind hole corresponds to a coaxial a diameter of Ф
The small through hole of d2, and the straight slot of width d2 is processed perpendicular to blind hole axis direction to the side of plate；D2 is than the thermoelectricity that is assembled
Even sensor diameter is big, and d1 is bigger than spring outer diameter, and Ld1 need to be less than the length after spring-compressed；The stud first half is threaded,
Bottom end is inserted into the blind hole processed on outer wall of combustion chamber, and is welded and fixed, and the angle after stud welding is α, with annular pressing plate two
Notch semi-cylindrical center angle is identical.
Measured combustion chamber processes 5 countersunk head blind holes on nozzle section outer wall and inner wall, and the macropore in countersunk head blind hole is only
In outer wall；5 blind hole centerlines are β, correspond to the center of adjacent 5 fins on inner wall respectively；Blind hole depth
Control determines that L1, L2, L3, L4 are the arithmetic progression gradually increased according to distance L1~L5 of hole bottom distance internal face.
L1, L2, L3, L4 are the arithmetic progression gradually increased, take 0.4 in the case where ensureing that inner wall is not pierced~
The value of 0.8mm, L4 will ensure that the measurement end of corresponding thermocouple sensor is located at what temperature was changed linearly with radial position
Section, no more than 2mm.
Design of length of the thermocouple sensor below catch is long under L1~L4 corresponding aperture catch into two kinds of sizes
It spends for identical size, length is another size under L5 corresponding aperture catch
When temperature measurement module is installed, corresponding countersunk head on outer wall of combustion chamber is inserted at 5 thermocouple sensor temperature-sensitive ends first
In the aperture of blind hole, in heat insulation housing insertion macropore；Then thermocouple sensor is passed through in advance in spring more than narrower portion
Width on annular pressing plate is that the straight slot of d2 is penetrated in the through-hole of diameter Ф d2, then by thermocouple sensor in catch with top
Divide and be inserted in together in the blind hole Ф d1 on annular pressing plate, and firmly push annular pressing plate, spring is made to generate certain decrement, together
When stud is made to be each passed through the horseshoe v notch v at its both ends, be then screwed into stud using nut and push down annular pressing plate；Spring-compressed
The power generated afterwards, which acts on catch, makes the temperature-sensitive end of thermocouple sensor be contacted with the measured hole bottom surface on combustion chamber；To ensure to survey
Dose-effect fruit, spring compression force take 3~6N to be advisable, and decrement is controlled in 10~15mm, passes through annular pressing plate both ends horseshoe v notch v
Limiting is realized in the cooperation of inside semi-cylindrical and stud；It is screwed into the Md3 threaded holes at annular pressing plate both ends using housing screw, and
Compress stud.
It is prepared by the following combustion chamber nozzle section and is tested the hot-fluid at position, gas wall temperature, outer wall temperature parameter：Pass through annular
Spring compression force is applied on the probe-type micro thermocouple sensor that 5 length differ by pressing plate, is allowed to be inserted into combustion chamber room
On wall in the blind hole of different depth, the temperature of bottom hole position is measured；Using the wall temperature data of the different depth directly measured, use
The gentle wall temperature of hot-fluid is calculated in Fourier law；From the point of view of Three-dimensional Heat-transfer Numerical Simulation Results, away from gas wall surface 2mm distances
Interior, rib central temperature increases linear reduce with the distance apart from gas wall surface；By 4 thermocouple sensor temperature-sensitive end arrangements herein
In linear change section and in different depth layers, one group of distance-temperature value (Li, Twi) (i=1,2,3,4) is obtained；Thus
Group data carry out linear fit and obtain formula Twx=aL+Tw0：When L is equal to 0, Tw0 is gas wall temperature；Fitting a straight line in formula
Slope be equal to temperature gradient, by Fourier law understand heat flow densityλ is solid wall material in formula
Thermal conductivity factor, measured value Tw5 is outer wall temperature value in temperature measurement module.
Having the beneficial effect that acquired by the present invention：
The present invention realizes the hot-fluid to a certain position of combustion chamber nozzle section, gas wall temperature and outside wall temperature by a module
The measurement of three parameters has the integration of height.Sensor is circumferentially arranged in combustion chamber by the present invention by annular pressing plate
In a certain cross section of axis, measurement result is not influenced by parameters such as hot-fluid, temperature along axis acute variation.This
Invention using spring compression force as thermocouple pressing force, can by controlling quantitative control of the decrement realization to pretightning force,
Ensure that thermocouple temperature sensitive end contacts good and test data stability with measured surface and has under heat test vibration environment
Effect property.Of the invention to use stud installation, screw lock, any sensor is detachable after damaging, and has simple in structure, maintenance
The advantages of facilitating.To being tested thrust chamber, the tiny blind hole of certain depth need to be only processed on the locular wall of combustion chamber, you can meet and survey
Amount requirement, the diabatic process and structural-load-carrying capacity influence on product are small, and cooling structure can be carried out fully according to true combustion chamber
Design, available for diabatic process research of the full-scale or contracting than combustion chamber.
Description of the drawings
Fig. 1 is combustion chamber chamber wall temperature gradiometry module 3-D view of the present invention；
Fig. 2 is combustion chamber chamber wall temperature gradiometry module annular pressing plate vertical view of the present invention；
Fig. 3 is combustion chamber chamber wall temperature gradiometry module annular pressing plate D-D sectional views of the present invention；
Fig. 4 installs rearview for combustion chamber chamber wall temperature gradiometry module of the present invention；
Fig. 5 is C direction views after combustion chamber chamber wall temperature gradiometry module of the present invention installation；
In figure：1st, nut；3rd, stud；4th, thermocouple sensor；5th, heat insulation housing；6th, housing screw；7th, supporting sleeve；
8th, spring；9th, catch；10th, annular pressing plate；11st, outer wall；12nd, inner wall.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
As shown in Figure 1, Liquid Rocket Engine Combustion Chambers nozzle section chamber wall temperature gradiometry module of the present invention is
Loop configuration, including 10,5 thermocouple sensors 4 of annular pressing plate, spring 8, catch 9, heat insulation housing 5, supporting sleeve 7, nut 1,
Stud 3, housing screw 6；Disc catch 9 is welded at every 4 temperature-sensitive end of thermocouple sensor, thermocouple sensor 4 exists
The one end on 9 top of catch passes through supporting sleeve 7 and spring 8, and supporting sleeve 7 is inserted in spring 8, is inserted in together in annular pressing plate 10, heat
Thermocouple sensor 4 is penetrated with lower part in heat insulation housing 5 in catch 9.
As shown in Figures 2 and 3, annular pressing plate 10 is partial circle plank frame, the both ends of partial circle along annulus radially
Horseshoe v notch v is machined with, gap width n is more slightly larger than 3 outer diameter of stud, and inner side is semi-cylindrical, two notch semi-cylindricals
Center angle α processes the tapped through hole of Md3 sizes on the plate body of each notch the same side.Between two horseshoe v notch vs
Even 5 axis angles of arrangement are β, the radial blind holes of a diameter of Ф d1, blind hole depth Ld1, and the bottom of each blind hole corresponds to one
The small through hole of a coaxial a diameter of Ф d2, and perpendicular to blind hole axis direction width m (being equal to d2) is processed to the side of plate
Straight slot.D2 is more slightly larger than 4 diameter of thermocouple sensor assembled, and d1 is more slightly larger than 8 outer diameter of spring, and Ld1 need to be compressed less than spring 8
Length afterwards.
As shown in figure 4, measured combustion chamber needs 5 countersunk head blind holes of processing on nozzle section outer wall 11 and inner wall 12,
In, the macropore in countersunk head blind hole is only positioned in outer wall 11.5 blind hole centerlines are β, correspond to the phase on inner wall 12 respectively
The center of adjacent 5 fins.Blind hole depth is controlled and is determined according to distance L1~L5 of hole bottom distance internal face, L1, L2, L3, L4
For the arithmetic progression gradually increased, L1 values are as small as possible, according to machining accuracy in the case where ensureing that inner wall is not pierced one
As take 0.4~0.8mm, the value of L4 will ensure that the measurement end of corresponding thermocouple sensor 4 is located at temperature and is in radial position
The section of linear change, generally no greater than 2mm.
3 first half of stud is threaded, and bottom end is inserted into the blind hole processed on outer wall of combustion chamber 11, and is welded and fixed,
Angle after stud 3 welds is α, identical with 10 liang of notch semi-cylindrical center angles of annular pressing plate.
Schematic diagram after annular temperature measurement module installation is shown in Fig. 4 and Fig. 5.As shown in figure 4, when temperature measurement module is installed, first by 5
4 temperature-sensitive end of branch thermocouple sensor is inserted on outer wall of combustion chamber 11 in the aperture of corresponding countersunk head blind hole, and heat insulation housing 5 is embedded in greatly
Kong Zhong.Then it is in advance the logical of d2 by the width on annular pressing plate 10 in more than 8 narrower portion of spring by thermocouple sensor 4
Slot is penetrated in the through-hole of diameter Ф d2, then by thermocouple sensor 4 at 9 above section of catch (including spring 8, supporting sleeve 7)
It is inserted in together in the blind hole Ф d1 on annular pressing plate 10, and firmly pushes annular pressing plate 10, spring 8 is made to generate certain compression
Amount, while stud 3 is made to be each passed through the horseshoe v notch v at its both ends, then stud 3 is screwed into using nut 1 push down annular pressing plate
10.The power that spring 8 generates after compressing acts on temperature-sensitive end and the measured hole bottom on combustion chamber that catch 9 makes thermocouple sensor 4
Face contacts.To ensure measurement effect, spring compression force generally takes 3~6N to be advisable, and decrement general control can lead in 10~15mm
It crosses 10 both ends shape of a hoof inner side semi-cylindrical of annular pressing plate and limiting is realized in the cooperation of stud 3.8 rigidity of spring can be according to upper
The requirement for stating compressing force and decrement determines.As shown in figure 5, to prevent the generation of nut 1 loosening during heat test from causing ring
Shape pressing plate 10 is shaken so as to cause temperature-sensitive end in contact bad, and the Md3 threaded holes at 10 both ends of annular pressing plate are screwed into using housing screw 6
In, and compress stud 3.
Thermocouple sensor 4 is mutually coordinated in length of the catch below 9 according to outer wall of combustion chamber 11 with the hole depth on inner wall 12,
It is designed to two kinds of sizes, length is identical size under L1~L4 corresponding aperture catch, and length is another size under L5 corresponding aperture catch.
Spring rate is selected as 0.335N/mm in this example, and amount of spring compression is controlled in 15mm, is thus inserted into the thermoelectricity of L1~L4 corresponding apertures
The maximum difference of amount of spring compression on even sensor 4 is in 1.2mm, and the difference of the compressing force of generation is 0.4N, stress basic one
It causes, and can realize that L1~L4 respective sensors are same specification.
Combustion chamber nozzle section is obtained by the following technical programs is tested the hot-fluid at position, gas wall temperature, outer wall temperature parameter：
Using annular temperature measurement module, 8 compressing force of spring is applied to by the probe-type that 5 length differ by annular pressing plate 10
On micro thermocouple sensor 4, it is allowed to be inserted into the temperature that bottom hole position in the blind hole of different depth, is measured on the locular wall of combustion chamber.
Using the wall temperature data of the different depth directly measured, the gentle wall temperature of hot-fluid is calculated with Fourier law：
From the point of view of Three-dimensional Heat-transfer Numerical Simulation Results, in away from gas wall surface 2mm distances, rib central temperature is with apart from gas wall surface
Distance increase linear reduce.Therefore, 44 temperature-sensitive end of thermocouple sensor arrangements in this linear change section and are located
In different depth layers, one group of distance-temperature value (Li, Twi) (i=1,2,3,4) is obtained.Data can thus be organized and carry out Linear Quasi
Conjunction obtains formula Twx=aL+Tw0：When L is equal to 0, Tw0 is gas wall temperature；The slope of fitting a straight line is equal to temperature in formula
Gradient understands heat flow density by Fourier lawλ is the thermal conductivity factor of solid wall material in formula.Thermometric mould
Measured value Tw5 is outer wall temperature value in block.
Claims (4)
1. a kind of combustion chamber chamber wall temperature gradiometry module, it is characterised in that：The module is loop configuration, including annular pressing plate
(10), 5 thermocouple sensors (4), spring (8), catch (9), heat insulation housing (5), supporting sleeve (7)；Every thermocouple sensing
Disc catch (9) is welded at device (4) temperature-sensitive end, thermocouple sensor (4) passes through support in the one end on catch (9) top
(7) and spring (8) are covered, supporting sleeve (7) is inserted in spring (8), is inserted in together in annular pressing plate (10), thermocouple sensor (4)
It is penetrated in heat insulation housing (5) with lower part in catch (9)；
The annular pressing plate (10) is partial circle plank frame, and the both ends of partial circle are radially machined with horseshoe along annulus
V notch v, gap width n are bigger than stud (3) outer diameter, and inner side is semi-cylindrical, two notch semi-cylindrical center angle αs, often
The tapped through hole of Md3 sizes is processed on the plate body of a notch the same side；5 axis are evenly arranged between two horseshoe v notch vs
Angle is β, the radial blind holes of a diameter of Ф d1, blind hole depth Ld1, the bottom of each blind hole correspond to one it is coaxial a diameter of
The small through hole of Ф d2, and the straight slot of width d2 is processed perpendicular to blind hole axis direction to the side of plate；D2 is than the warm assembled
Thermocouple sensor (4) diameter is big, and d1 is bigger than spring (8) outer diameter, and Ld1 need to be less than spring (8) compressed length；On stud (3)
Half portion is threaded, and bottom end is inserted into the blind hole processed on outer wall of combustion chamber (11), and is welded and fixed, after stud (3) welding
Angle be α, it is identical with (10) two notch semi-cylindrical center angle of annular pressing plate；
Measured combustion chamber processes 5 countersunk head blind holes on nozzle section outer wall (11) and inner wall (12), big in countersunk head blind hole
Hole is only positioned in outer wall (11)；5 blind hole centerlines are β, are corresponded to respectively in adjacent 5 fins on inner wall (12)
The heart；Blind hole depth control determined according to distance L1~L5 of hole bottom distance internal face, L1, L2, L3, L4 be gradually increase etc.
Difference series；
L1, L2, L3, L4 are the arithmetic progression gradually increased, and 0.4~0.8mm, L4 are taken in the case where ensureing that inner wall is not pierced
Value to ensure that the measurement end of corresponding thermocouple sensor (4) is located at the section that temperature is changed linearly with radial position,
No more than 2mm.
2. chamber wall temperature gradiometry module in combustion chamber according to claim 1, it is characterised in that：The thermocouple passes
Sensor (4) is in the following Design of length of catch (9) into two kinds of sizes, and length is identical size under L1~L4 corresponding aperture catch, L5
Length is another size under corresponding aperture catch.
3. chamber wall temperature gradiometry module in combustion chamber according to claim 1, it is characterised in that：Temperature measurement module is installed
When, 5 thermocouple sensor (4) temperature-sensitive ends are inserted on outer wall of combustion chamber (11) in the aperture of corresponding countersunk head blind hole first,
In the embedded macropore of heat insulation housing (5)；Then thermocouple sensor (4) is passed through into annular in advance in spring (8) more than narrower portion
The straight slot that width on pressing plate (10) is d2 is penetrated in the through-hole of diameter Ф d2, then by thermocouple sensor (4) in catch (9)
Above section is inserted in together in the blind hole Ф d1 on annular pressing plate (10), and firmly pushes annular pressing plate (10), produces spring (8)
Raw certain decrement, while stud (3) is made to be each passed through the horseshoe v notch v at its both ends, then spiral shell is screwed into using nut (1)
Column (3) pushes down annular pressing plate (10)；The power generated after spring (8) compression, which acts on catch (9), makes the sense of thermocouple sensor (4)
Measured hole bottom surface contact on Wen Duanyu combustion chambers；To ensure measurement effect, spring compression force takes 3~6N to be advisable, decrement control
It makes in 10~15mm, limit is realized in the cooperation for passing through annular pressing plate (10) both ends shape of a hoof inner side semi-cylindrical and stud (3)
Position；It is screwed into using housing screw (6) in the Md3 threaded holes at annular pressing plate (10) both ends, and compresses stud (3).
4. chamber wall temperature gradiometry module in combustion chamber according to claim 1, it is characterised in that：It obtains by the following method
It obtains combustion chamber nozzle section and is tested the hot-fluid at position, gas wall temperature, outer wall temperature parameter：Spring (8) is compressed by annular pressing plate (10)
Power is applied on the probe-type micro thermocouple sensor (4) that 5 length differ, and is allowed to be inserted into different depth on the locular wall of combustion chamber
Blind hole in, measure the temperature of bottom hole position；Using the wall temperature data of the different depth directly measured, with Fourier law meter
Calculation obtains the gentle wall temperature of hot-fluid；From the point of view of Three-dimensional Heat-transfer Numerical Simulation Results, in away from gas wall surface 2mm distances, rib central temperature
Increase linear reduce with the distance apart from gas wall surface；By 4 thermocouple sensor (4) temperature-sensitive end arrangements in this linear change area
In and in different depth layers, obtain one group of distance-temperature value (Li, Twi) (i=1,2,3,4)；Thus group data into
Row linear fit obtains formula Twx=aL+Tw0：When L is equal to 0, Tw0 is gas wall temperature；The slope of fitting a straight line in formula
Equal to temperature gradient, heat flow density is understood by Fourier lawλ is the heat conduction system of solid wall material in formula
It counts, measured value Tw5 is outer wall temperature value in temperature measurement module.
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| CN108801487B (en) * | 2018-04-17 | 2021-01-08 | 李傲兰 | Metal test piece temperature measuring device and system |
| CN109012529A (en) * | 2018-06-05 | 2018-12-18 | 佛山科学技术学院 | Can stably measured temperature the cold well of light-catalyzed reaction instrument |
| CN112393815B (en) * | 2020-12-09 | 2023-06-09 | 太原理工大学 | Large-diameter hydraulic clutch friction surface transient temperature field testing method |
| CN113188155A (en) * | 2021-05-07 | 2021-07-30 | 南京航空航天大学 | Backflow combustion chamber for wall temperature distribution measurement based on thermocouple |
| CN113776846B (en) * | 2021-09-10 | 2023-06-27 | 西安航天动力研究所 | Real-time heat flux density measuring device and measuring method for wall surface of combustion chamber |
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| JP2001083019A (en) * | 1999-09-13 | 2001-03-30 | Yokogawa Electric Corp | Temperature measurement apparatus |
| CN2625876Y (en) * | 2002-12-30 | 2004-07-14 | 沈阳黎明航空发动机(集团)有限责任公司 | Rotary testing apparatus for temperature of engine combustion chamber temperature field |
| CN101608953B (en) * | 2008-06-19 | 2012-05-23 | 北京航空航天大学 | Method and device for measuring temperature and heat flow distribution on internal face of combustion chamber |
| CN101343676B (en) * | 2008-09-02 | 2010-06-02 | 内蒙古科技大学 | On-line detecting device and method for temperature of blast furnace chamber |
| CN102095515B (en) * | 2011-01-05 | 2012-07-04 | 北京航空航天大学 | Temperature-measuring device for cylindrical combustion chamber wall |
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