CN114893327B - Method for detecting uniformity of liquid film on outer ring of pintle injector - Google Patents
Method for detecting uniformity of liquid film on outer ring of pintle injector Download PDFInfo
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- CN114893327B CN114893327B CN202210399663.XA CN202210399663A CN114893327B CN 114893327 B CN114893327 B CN 114893327B CN 202210399663 A CN202210399663 A CN 202210399663A CN 114893327 B CN114893327 B CN 114893327B
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- liquid film
- outer ring
- uniformity
- pintle injector
- injector
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- 239000007788 liquid Substances 0.000 title claims abstract description 110
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000006185 dispersion Substances 0.000 claims abstract description 39
- 238000001514 detection method Methods 0.000 claims abstract description 38
- 238000013461 design Methods 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 239000003380 propellant Substances 0.000 claims description 7
- 239000000945 filler Substances 0.000 claims description 6
- 238000000691 measurement method Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 9
- 230000007547 defect Effects 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- -1 polytetrafluoroethylene Polymers 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K9/00—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
- F02K9/96—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof characterised by specially adapted arrangements for testing or measuring
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention provides a device and a method for detecting the uniformity of the outer ring liquid film of a pintle injector, which are used for solving the problems that the uniformity of the outer ring liquid film of the pintle injector can only be qualitatively detected and can not be quantitatively detected in an observation mode. The invention replaces the traditional observation method, utilizes a simple detection device, divides the conical liquid film into a plurality of parts in the circumferential direction by expanding the outer liquid film, measures the quality and calculates the dispersion difference, quantitatively evaluates and detects the uniformity of the outer liquid film of the pintle injector, and effectively solves the quantitative measurement problem of the uniformity of the outer liquid film with low cost.
Description
Technical Field
The invention belongs to the technical field of liquid rocket engines, and particularly relates to a device and a method for detecting uniformity of liquid film on an outer ring of a pintle injector.
Background
The concept of a pintle injector has been proposed in the fifties of the twentieth century, and has been widely used because of its high structural reliability, ease of repeated use, and ease of achieving a wide range of variable thrust. The outer ring of a typical pintle injector is of a circular seam injection structure, and the uniformity of liquid film of the outer ring influences the combustion efficiency, the body cooling reliability and the service life of an engine. The outer ring liquid film is in a typical flowing state, the outer ring liquid film is converged towards the center, the circumferential uniformity of the liquid film is difficult to quantitatively measure by the existing detection means, and the uniformity of the outer ring liquid film needs to be measured in an effective mode so as to detect the machining quality of the pintle injector.
The uniformity of the liquid film on the outer ring of the pintle injector influences the combustion efficiency, the body cooling reliability and the service life of the engine, and the detection of the uniformity of the liquid film on the outer ring is extremely important. The flow state of the outer ring liquid film makes the quantitative detection of the uniformity of the liquid film extremely difficult, the uniformity of the liquid film of the outer ring is qualitatively checked in the conventional observation mode, the loss of the liquid rocket engine caused by the flight failure due to the quality defect is huge, and the quantitative detection of the uniformity of the liquid film of the outer ring of the pintle injector is very important and has wide application prospect.
Disclosure of Invention
The invention aims to solve the problems that the uniformity of the outer ring liquid film of the existing pintle injector is mainly detected qualitatively and not quantitatively by adopting an observation mode, and provides a device and a method for detecting the uniformity of the outer ring liquid film of the pintle injector.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the method for detecting the uniformity of the liquid film on the outer ring of the pintle injector is characterized by comprising the following steps of:
step 1, water is used for replacing propellant, a circular seam formed by a central cylinder of the needle bolt injector and a thrust chamber shell is injected through a filler neck under the design flow, and whether a liquid film on the outer ring of the needle bolt injector is absent or not is observed;
if yes, the uniformity of the liquid film at the outer ring of the pintle injector is not qualified; otherwise, enter step 2;
step 2, installing a detection device on a central cylinder of the pintle injector, and further detecting an outer ring liquid film of the pintle injector by using the detection device; water is used for replacing propellant, and is injected into the annular seam of the outer ring of the needle bolt injector through the filler neck under the design flow, so as to observe whether the liquid film of the outer ring of the needle bolt injector is partially absent;
if yes, repairing or replacing the detection device, and repeating the step 2; otherwise, entering a step 3;
step 3, dividing the conical liquid film into a plurality of parts in the circumferential direction by using a measuring tool, measuring the weight of each part, and calculating the weight dispersion difference of the liquid film;
step 4, rotating the detection device at different angles, repeating the measurement method of the step 3, and calculating the weight dispersion difference of the liquid film at different angles;
step 5, preliminarily judging whether the uniformity of the outer ring liquid film of the pintle injector meets the requirement according to the weight dispersion difference of the liquid film obtained in the step 3 and the step 4; step 6, changing the flow rate of the medium water, respectively according to the conditions of 1.1 times of design flow rate and 0.9 times of design flow rate, repeating the measuring methods of the step 3 and the step 4, and calculating the weight dispersion difference of the liquid film under different angles of different flow rates;
and 7, judging whether the weight dispersion differences of the liquid film obtained in the step 6 are smaller than a set dispersion difference threshold value, if yes, judging that the uniformity of the liquid film of the outer ring of the pintle injector meets the requirement, otherwise, judging that the uniformity of the liquid film of the outer ring of the pintle injector is not qualified, and finishing the detection of the uniformity of the liquid film of the outer ring of the pintle injector.
Further, the step 5 specifically comprises:
judging whether the weight dispersion differences of the liquid films obtained in the step 3 and the step 4 are larger than a dispersion threshold value or not:
if the weight dispersion difference of all liquid films is larger than the dispersion threshold value, the uniformity of the liquid film at the outer ring of the pintle injector is not qualified;
if one of the weight dispersion differences of all the liquid films is larger than the dispersion difference threshold value, replacing the detection device, and repeating the step 3 and the step 4;
if the weight dispersion difference of all the liquid films is not larger than the dispersion difference threshold value, the uniformity of the liquid film at the outer ring of the pintle injector is preliminarily judged to meet the requirement, and the step 6 is entered.
Further, in step 4, the rotation detecting means is rotated at least 2 times, 90 ° and 180 °, respectively.
Further, in the step 5 and the step 7, the dispersion threshold is ±5%.
The invention provides a device for detecting uniformity of a liquid film on an outer ring of a pintle injector, which is characterized in that: the device comprises a positioning surface, a cylindrical section, an expansion cone section and a threaded rod penetrating through the center of the positioning surface, which are coaxially arranged in sequence from top to bottom; the upper end of the cylindrical section is used for being connected with the outlet of the central cylinder of the pintle injector; the lower end of the threaded rod is connected with the upper end face of the cylindrical section;
the upper end of the threaded rod is fixedly connected with the central cylinder of the pintle injector through a nut, and the positioning surface is used for coaxially positioning the detection device and the central cylinder.
Further, the fit clearance between the positioning surface and the inner hole of the central cylinder is not more than 0.01mm;
the coaxiality requirements of the positioning surface, the cylindrical section and the expansion cone section are not more than phi 0.01mm;
the diameter of the cylindrical section is larger than 0.01mm than the diameter of the outlet of the central cylinder;
the height of the cylindrical section is more than 10mm; the included angle alpha=60-90 degrees between the oblique side of the expansion cone section and the axis.
Further, the detection device is made of aluminum or polytetrafluoroethylene.
Compared with the prior art, the invention has the following beneficial technical effects:
the method for detecting the uniformity of the liquid film on the outer ring of the pintle injector replaces the traditional observation method, utilizes a simple detection device, divides the conical liquid film into a plurality of parts in the circumferential direction by using the outer ring liquid film to be stretched, measures the mass and calculates the dispersion difference, quantitatively evaluates and detects the uniformity of the liquid film on the outer ring of the pintle injector, and effectively solves the problem of quantitative measurement of the uniformity of the liquid film on the outer ring with low cost.
Drawings
FIG. 1 is a schematic diagram of an embodiment of a device for detecting uniformity of liquid film on an outer ring of a pintle injector according to the present invention;
reference numerals:
the device comprises a 1-filler neck, a 2-central cylinder, a 3-nut, a 4-shell, a 5-detection device, a 6-positioning surface, a 7-central cylinder outlet, an 8-cylindrical section, a 9-expansion cone section and a 10-threaded rod.
Detailed Description
In order to make the objects, advantages and features of the present invention more clear, the present invention provides a device and a method for detecting uniformity of liquid film on an outer ring of a pintle injector, which are described in further detail below with reference to the accompanying drawings and specific embodiments. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted", "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
As shown in FIG. 1, the device for detecting the uniformity of the liquid film on the outer ring of the pintle injector comprises a positioning surface 6, a cylindrical section 8, an expansion cone section 9 and a threaded rod 10 penetrating through the center of the positioning surface 6, which are coaxially arranged in sequence from top to bottom; the upper end of the cylindrical section 8 is used for being connected with a central cylinder outlet 7 of the pintle injector; the lower end of the threaded rod 10 is connected with the upper end face of the cylindrical section 8;
the upper end of the threaded rod 10 is fixedly connected with the central cylinder 2 of the pintle injector through the nut 3, the detection device 5 and the central cylinder 2 are coaxially arranged through the positioning surface 6, and the fit clearance between the positioning surface 6 and the inner hole of the central cylinder 2 is not more than 0.01mm.
The coaxiality requirements of the positioning surface 6, the cylindrical section 8 and the expansion cone section 9 are not more than phi 0.01mm, so that the outer ring liquid film is ensured not to deviate due to the detection device 5; the diameter of the cylindrical section 8 is more than 0.01mm larger than that of the outlet 7 of the central cylinder, so that the outer ring liquid film is prevented from directly striking the testing device, and the measuring result is not real.
The height of the cylindrical section 8 is larger than 10mm, so that the smooth transition of the liquid film on the wall of the cylindrical section to the expansion cone section 9 is ensured; the included angle alpha=60-90 degrees between the inclined edge of the expansion cone section 9 and the axis enables the outer ring liquid film to have certain expansion, is convenient for measurement, and can not obviously amplify the initial defect of the outer ring liquid film.
In order to avoid the detection device 5 from damaging the central cylinder 2, the detection device 5 can be made of materials with low hardness such as aluminum or polytetrafluoroethylene.
The outer ring propellant enters a circular seam formed by assembling the central cylinder 2 and the thrust chamber shell 4 through the filler neck 1, the outer ring liquid film flows out of the circular seam and forms a conical liquid film under the action of the expansion cone section 9, the conical liquid film can be measured by using a conventional detection tool, the conical liquid film is divided into a plurality of equal parts in the circumferential direction by the conventional detection tool, the weight of each part is measured, and the dispersion difference is not more than +/-5%.
The outer ring liquid film uniformity detection method of the needle bolt injector outer ring liquid film uniformity detection device 5 comprises the following steps:
step 1, water is used for replacing propellant, the pintle injector is injected through a circular seam formed by a central cylinder 2 of the pintle injector and a thrust chamber shell 4 under the design flow, and whether a liquid film on the outer ring of the pintle injector is absent or not is observed;
if the outer ring liquid film lacks the liquid film, the pintle injector is proved to be unqualified; if the outer ring liquid film is continuous, entering a step 2;
step 2, connecting the outer ring liquid film uniformity detection device of the pintle injector with a central cylinder of the pintle injector, and further detecting the outer ring liquid film of the pintle injector by using the detection device; injecting the water into the pintle injector under the designed flow by using the water to replace the propellant, and observing whether the liquid film on the outer ring of the pintle injector is partially absent;
if the liquid film is partially absent, checking whether the detection device has defects, repairing or replacing the detection device according to specific conditions, and ensuring that the liquid film of the outer ring is circumferentially and continuously distributed, wherein the situation of partial absence of the liquid film does not exist;
step 3, after installing a qualified detection device, injecting water into a pintle injector under the design flow, dividing a conical liquid film into a plurality of parts in the circumferential direction by using a conventional measurement tool, measuring the weight of each part, wherein the dispersion should be not more than +/-5%, and the measurement time is generally not less than 50s;
step 4, rotating the detection device for 180 degrees, and repeating the step 3 to measure the uniformity of the liquid film on the outer ring of the pintle injector;
step 5, if the liquid film dispersion difference is larger than +/-5% in the two measurement results of the step 3 and the step 4, judging that the uniformity of the liquid film of the outer ring of the pintle injector does not meet the requirement;
if the dispersion difference of the liquid film at one time in the two measurement results is more than +/-5%, the detection device is replaced, and the steps 3-4 are repeated;
if the dispersion difference of the liquid film in the two measurement results is not more than +/-5%, preliminarily judging that the uniformity of the liquid film at the outer ring of the pintle injector meets the requirement, and entering a step 6;
step 6, changing the flow of medium water, respectively measuring the uniformity of the outer ring liquid film of the detection device at 0 degrees and 180 degrees under the conditions of 1.1 times of design flow and 0.9 times of design flow, and measuring the weight of each part, wherein the dispersion should be not more than +/-5%, and the measuring time is generally not less than 50s;
if the dispersion difference of the liquid film is not more than +/-5% in all the measurement results, judging that the uniformity of the liquid film at the outer ring of the pintle injector meets the requirement, and finishing the detection of the uniformity of the liquid film at the outer ring of the pintle injector.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments may be modified or some or all of the technical features may be replaced equivalently, so any simple modification, equivalent variation and modification made to the foregoing embodiments according to the technical substance of the present invention will fall within the protection scope of the technical scheme of the present invention.
Claims (4)
1. The method for detecting the uniformity of the liquid film on the outer ring of the pintle injector is characterized by comprising the following steps of:
step 1, water is used for replacing propellant, a circular seam formed by a central cylinder of the needle bolt injector and a thrust chamber shell is injected through a filler neck under the design flow, and whether a liquid film on the outer ring of the needle bolt injector is absent or not is observed;
if yes, the uniformity of the liquid film at the outer ring of the pintle injector is not qualified; otherwise, enter step 2;
step 2, installing a detection device on a central cylinder of the pintle injector, and further detecting an outer ring liquid film of the pintle injector by using the detection device; water is used for replacing propellant, and is injected into the annular seam of the outer ring of the needle bolt injector through the filler neck under the design flow, so as to observe whether the liquid film of the outer ring of the needle bolt injector is partially absent;
if yes, repairing or replacing the detection device, and repeating the step 2; otherwise, entering a step 3;
step 3, dividing the conical liquid film into a plurality of parts in the circumferential direction by using a measuring tool, measuring the weight of each part, and calculating the weight dispersion difference of the liquid film;
step 4, rotating the detection device at different angles, repeating the measurement method of the step 3, and calculating the weight dispersion difference of the liquid film at different angles;
step 5, preliminarily judging whether the uniformity of the outer ring liquid film of the pintle injector meets the requirement according to the weight dispersion difference of the liquid film obtained in the step 3 and the step 4; step 6, changing the flow rate of the medium water, respectively according to the conditions of 1.1 times of design flow rate and 0.9 times of design flow rate, repeating the measuring methods of the step 3 and the step 4, and calculating the weight dispersion difference of the liquid film under different angles of different flow rates;
and 7, judging whether the weight dispersion differences of the liquid film obtained in the step 6 are smaller than a set dispersion difference threshold value, if yes, judging that the uniformity of the liquid film of the outer ring of the pintle injector meets the requirement, otherwise, judging that the uniformity of the liquid film of the outer ring of the pintle injector is not qualified, and finishing the detection of the uniformity of the liquid film of the outer ring of the pintle injector.
2. The method for detecting the uniformity of the liquid film on the outer ring of the pintle injector according to claim 1, wherein the step 5 is specifically:
judging whether the weight dispersion differences of the liquid films obtained in the step 3 and the step 4 are larger than a dispersion threshold value or not:
if the weight dispersion difference of all liquid films is larger than the dispersion threshold value, the uniformity of the liquid film at the outer ring of the pintle injector is not qualified;
if one of the weight dispersion differences of all the liquid films is larger than the dispersion difference threshold value, replacing the detection device, and repeating the step 3 and the step 4;
if the weight dispersion difference of all the liquid films is not larger than the dispersion difference threshold value, the uniformity of the liquid film at the outer ring of the pintle injector is preliminarily judged to meet the requirement, and the step 6 is entered.
3. The method for detecting the uniformity of the liquid film on the outer ring of the pintle injector according to claim 2, wherein the method comprises the following steps of: in step 4, the rotation detecting means is rotated at least 2 times, 90 ° and 180 °, respectively.
4. A method for detecting uniformity of liquid film on an outer ring of a pintle injector according to any one of claims 1-3, which is characterized in that: in the step 5 and the step 7, the dispersion threshold value is +/-5%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210399663.XA CN114893327B (en) | 2022-04-15 | 2022-04-15 | Method for detecting uniformity of liquid film on outer ring of pintle injector |
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| CN202210399663.XA CN114893327B (en) | 2022-04-15 | 2022-04-15 | Method for detecting uniformity of liquid film on outer ring of pintle injector |
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| CN114893327B true CN114893327B (en) | 2023-12-26 |
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| CN114893327A (en) | 2022-08-12 |
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