CN112816219A - Direct-connected test bench air supply governing system - Google Patents
Direct-connected test bench air supply governing system Download PDFInfo
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- CN112816219A CN112816219A CN202110160408.5A CN202110160408A CN112816219A CN 112816219 A CN112816219 A CN 112816219A CN 202110160408 A CN202110160408 A CN 202110160408A CN 112816219 A CN112816219 A CN 112816219A
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- 238000012360 testing method Methods 0.000 title claims abstract description 78
- 230000007704 transition Effects 0.000 claims abstract description 54
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 20
- 230000001105 regulatory effect Effects 0.000 claims abstract description 11
- 239000011148 porous material Substances 0.000 claims abstract description 8
- 239000007789 gas Substances 0.000 claims description 27
- 238000001816 cooling Methods 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 12
- 230000003750 conditioning effect Effects 0.000 claims description 6
- 239000003570 air Substances 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims description 3
- 239000001257 hydrogen Substances 0.000 claims description 3
- 229910052739 hydrogen Inorganic materials 0.000 claims description 3
- 125000004435 hydrogen atom Chemical class [H]* 0.000 claims description 3
- 239000003350 kerosene Substances 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
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- 238000002485 combustion reaction Methods 0.000 abstract description 18
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- 238000010438 heat treatment Methods 0.000 abstract description 7
- 238000004378 air conditioning Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000005485 electric heating Methods 0.000 description 4
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- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
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Abstract
The invention discloses an air supply adjusting system of a direct-connected test bed, and particularly relates to the technical field of ground direct-connected tests of engines. A direct-connected test bed air supply regulating system comprises a mixing pipe, a flow stabilizing pipe, a flow dividing pipe, an overflow pipe, a transition pipe and an overflow Venturi, wherein the mixing pipe is communicated with a gas collecting ring, a cold air interface is arranged on the gas collecting ring, a gas collecting cavity is arranged in the mixing pipe, and a cold air mixing hole is formed in the gas collecting cavity; the shunt tubes are connected with the flow stabilizing tubes, one side of each shunt tube is composed of a main path outlet pipe and a bypass outlet pipe which are arranged in parallel, the main path outlet pipe is connected with the transition pipe, a first throttling pore plate is arranged between the transition pipe and the shunt tubes, the bypass outlet pipe is connected with the overflow pipe, and a second throttling pore plate is arranged in the overflow pipe. The technical scheme of the invention solves the problems that the components required in the existing overflow section are expensive and the flow measurement of the polluted air has errors, and can be used for the test working conditions of combustion heating test bed such as subsonic/supersonic speed, hypersonic speed and the like.
Description
Technical Field
The invention relates to the technical field of ground direct-connection type tests of engines, in particular to an air supply adjusting system of a direct-connection type test bed.
Background
In the ground direct-connected test, in order to simulate high-altitude high-speed working conditions, a test bed needs to provide high-temperature high-pressure air incoming flow for an engine inlet, and the supplied air is heated mainly in an electric heating or combustion heating mode. The electric heating direct-connected test bed is limited by electric heating element materials, and the total temperature of air at the outlet of the heater is generally less than 1100K; the combustion heating direct-connected test bed is limited by the combustion stability and the combustion efficiency of the heater, and the total temperature of air at the outlet of the heater is generally above 850K. Therefore, the electric heating direct-connected test bed usually carries out a sub/supersonic speed working condition test with the total temperature below 1100K, and the combustion heating direct-connected test bed usually carries out a hypersonic speed working condition test with the total temperature above 1100K.
In order to reduce the equipment construction cost and improve the use efficiency, a mixing section can be designed on the basis of the existing combustion heating direct-connected test bed, and the total temperature of air at the outlet of a combustion heater is reduced by mixing cold air, so that the test working condition range is widened, and the effect that one wind tunnel equipment can cover all test working conditions such as subsonic/supersonic speed, hypersonic speed and the like is realized.
The fired heater outlet air has not only a minimum total temperature limit, but also a minimum flow limit. At the minimum outlet flow, the lower the total temperature of the air required by the test working condition is, the larger the mixing amount of the cold air and the air flow after mixing are. When the air flow is larger than the flow required by the test working condition after mixing, an overflow device needs to be designed to discharge the redundant high-temperature air. Therefore, when the combustion heating direct-connected test bed is used for carrying out a test of working conditions with the total temperature below 1100K, the existing test bed needs to be modified, and a cold air mixing and overflow section is usually added.
At present, the design of a mixing section for widening the total temperature range of the test working condition by adding the mixing section on a combustion heating wind tunnel and a direct-connected test bed is common, but the design scheme of the mixing and overflowing section is rare. The main reason is that the scheme has the following two design difficulties: firstly, the flow of high-temperature gas entering a transition pipe is adjusted; secondly, the flow is accurately measured.
The high-temperature gas in the mixing section is divided into two paths, one path enters the test model through the transition pipe, and the other path is discharged through the overflow section. In order to meet the working condition requirements of different test models, an adjusting device needs to be designed in the overflow section to adjust the air flow entering the transition pipe, the air flow of the transition pipe after being shunted needs to be measured again, the air flow entering the transition pipe is indirectly adjusted, and the air flow of the transition pipe after being shunted needs to be measured again. Some existing solutions typically use a high temperature regulating valve to regulate the high temperature air flow and a high temperature orifice meter to measure the high temperature air flow. However, high temperature regulating valves and high temperature orifice meters are expensive and the latter need to be imported from foreign countries. For small, direct-connected test stands, this retrofit solution is costly. In addition, high temperature orifice flow meters are typically used for pure air flow measurements, and there is an error in measuring the contaminated air after the fired heater.
Disclosure of Invention
The invention aims to provide a direct-connected test bed air supply regulating system, which solves the problems that the components required in the existing overflow section are expensive and the flow measurement of polluted air has errors.
In order to achieve the purpose, the technical scheme of the invention is as follows: a direct-connected test bed air supply adjusting system comprises a mixing pipe, a flow stabilizing pipe, a flow dividing pipe, an overflow pipe, a transition pipe and an overflow Venturi which are detachably connected in sequence from left to right, wherein the cross section of the mixing pipe is horn-shaped, a gas collecting ring is communicated with the outside of the mixing pipe, a cold air interface is arranged on the gas collecting ring, a gas collecting cavity communicated with the gas collecting ring is arranged in the mixing pipe, and a plurality of cold air mixing holes are formed in the gas collecting cavity; the flow stabilizing pipe is an equal-diameter pipe, and the inner diameter of the flow stabilizing pipe is equal to the diameter of the widest part of the outlet of the mixing pipe; the inlet of shunt tubes is connected with the outlet of the flow stabilizing tube, the shunt tubes are composed of a main path outlet pipe and a bypass outlet pipe which are arranged in parallel, the main path outlet pipe is connected with a transition pipe, a first throttling pore plate is arranged between the transition pipe and the shunt tubes, the bypass outlet pipe is connected with an overflow pipe, a second throttling pore plate is arranged in the overflow pipe, and an overflow Venturi is arranged at the outlet of the overflow pipe.
The principle and the effect of the technical scheme are as follows: the hot-air of combustion heater export is connected to the mixing pipe in this scheme, and in the mixing air conditioning got into the gas collection ring through the air conditioning interface to in the air conditioning mixing hole injection mixing pipe, the gas collection chamber can carry out the hot-air of rectification back to the mixing pipe to air conditioning and mix the cooling. The cold air and the hot air in the mixing pipe enter the constant-diameter flow stabilizing pipe and are further mixed, so that the uniformity of a flow field is improved, and the temperature of each point in the constant-flow pipe is the same. The mixing air flowing through the flow stabilizing pipe respectively enters the main path outlet pipe and the bypass outlet pipe of the flow dividing pipe, and the mixing air flowing through the main path outlet pipe passes through the first throttling orifice plate and the transition pipe and then is connected with the test model to complete the test, so that the required high-temperature and high-pressure air inflow can be provided for the test model; and the mixing air flowing through the bypass outlet pipe and the overflow pipe can enter the overflow venturi after passing through the second throttling orifice plate, so that redundant mixing air is discharged into the atmosphere after the overflow flow is measured by the venturi, the measurement of the incoming flow of the mixing air entering the test model is indirectly realized, and meanwhile, the large-scale adjustment of the incoming flow of the air entering the test model is realized by the first throttling orifice plate and the second throttling orifice plate.
Furthermore, the cold air mixing holes are arranged in three rows, any row of cold air mixing holes are arranged on the sealing end face of the mixing pipe inlet, and the other two rows of cold air mixing holes are arranged on the inner wall of the mixing pipe inlet in a staggered mode.
Through the arrangement, the cold air can completely cover the inner wall of the mixing pipe, so that a cold air film is formed to prevent the hot air of the heater from ablating the wall surface of the mixing pipe.
Furthermore, the orifice plate is of a circular flat plate structure, and an orifice with the same diameter is formed in the center of the orifice plate.
Further, the air flow regulating formula in the transition pipe and the overflow pipe is as follows: assuming that the total air flow is
The transition duct has an air flow of
The overflow tube has an air flow of
Total pressure of the steady flow tube is P0wTotal temperature of T0The equivalent orifice area of the transition pipe (i.e., the first orifice plate) is AtestThe equivalent orifice area of the overflow pipe (i.e., the second orifice plate) is AoverThe formula of the choked flow can be obtained as follows:
further, the method for measuring the air flow in the overflow venturi comprises the following steps: total flow is measured on cold flow field of air, hydrogen, oxygen, kerosene and other supply pipelines of test bed
Calibrating; in the test and debugging stage, the flow passage of the transition pipe is firstly blocked by the baffle plate to lead the flow of all polluted air to flow
The total pressure P 'of the venturi is measured through a water-cooled venturi of the overflow pipeline'0venAccording to the flow formula:
can obtain constant term K of the heater and the polluted air in a mixed stateconta(ii) a During the formal test, the working condition and the mixing state of the heater are maintained, and then
KcontaAnd T0Opening the passage of the transition pipe when the parameters are unchanged, wherein the total pressure of the venturi pipe is measured at the moment0venThen, the flow of polluted air through the water-cooled venturi can be obtained as follows:
the polluted air flow entering the transition duct is then:
as can be seen from the formula (5), the method for measuring the overflow section water-cooling venturi combined with the cold flow calibration only needs to carry out more debugging times for completely blocking one transition pipe, and measures the total flow of the cold flow field of the supply pipeline
And total pressure P 'of water-cooled venturi for debugging train number'0venAnd then the total pressure P of the water-cooling venturi tube measured by formal test is combined0venThe flow rate of the polluted air of the transition pipe can be calculated by the formula (5)
Compared with the prior art, the beneficial effect of this scheme:
1. the mixing-overflowing structure of the scheme is simple, and the processing cost is low; compared with the existing high-temperature regulating valve, high-temperature orifice plate flowmeter and other finished products, the cost of the key technical scheme of adopting the double-orifice plate structure, the water-cooling venturi tube, the cold flow calibration method and the like is greatly reduced, and the measurement and control requirements on the test bed are also greatly reduced.
2. This scheme can accomplish the flow control and the accurate measurement of flow that get into the high temperature air of transition pipe simultaneously, and the very few debugging number of cars of accessible adjusts the incoming flow operating mode of the required temperature flow of test model with current combustion heater export air current fast, has the efficient advantage of regulation.
3. The mixing section of this scheme adopts wall aperture mixing mode, and mixing air conditioning can cover mixing section internal face completely, forms the cold air membrane of internal face before the complete mixing, need not to design water-cooling structure when experimental operating mode is less than 1000K, has advantages such as simple structure, low in processing cost, test time are long.
4. The double-throttling orifice plate structure can simultaneously adjust the air flow of the transition pipe and the overflow path, has the advantages of wide flow adjusting range and wide total pressure application range, and can meet the requirements of various sub/supersonic air flow working conditions. The existing high-temperature regulating valve has a limited flow regulating range and is only suitable for a certain total pressure range of air flow. And the orifice plate can realize high-precision flow regulation through a high-precision machining technology.
5. The high-temperature air flow measuring method combining the water-cooling venturi tube measurement and the cold flow calibration has the advantages of wide flow measuring range, high measuring precision, no influence of polluted air components and the like. The existing high-temperature orifice plate flowmeter generally has a certain flow and temperature measurement range, the measurement precision is influenced by the temperature of air flow, and a large error exists when the polluted air is measured. The high-temperature air flow measuring method provided by the invention can realize large-range flow measurement by processing low-cost water-cooling venturis with different throat diameters, and the measurement precision is not influenced by temperature and polluted air components.
Drawings
FIG. 1 is a front view of a direct test stand air supply conditioning system of the present invention;
fig. 2 is a cross-sectional view of a gas collection ring in a direct-connect test stand air supply conditioning system of the present invention.
Detailed Description
The present invention will be described in further detail below by way of specific embodiments:
reference numerals in the drawings of the specification include: the mixing device comprises a mixing pipe 1, a flow stabilizing pipe 2, an overflow pipe 3, a transition pipe 4, an overflow Venturi 5, a gas collecting ring 6, a cold air interface 7, a cold air pipe 8, a cold air mixing hole 9, a first throttling orifice plate 10, a second throttling orifice plate 11, a main path outlet pipe 12 and a bypass outlet pipe 13.
Examples
As shown in figures 1 and 2: a direct-connected test bed air supply regulating system comprises a mixing pipe, a flow stabilizing pipe, a flow dividing pipe, an overflow pipe, a transition pipe and an overflow Venturi tube which are sequentially connected through bolts from left to right, wherein the cross section of the mixing pipe is horn-shaped, the left side of the mixing pipe is wrapped with a first flange and a gas collecting ring positioned outside the first flange, the mixing pipe and a combustion heater can be fixedly connected together through the first flange, a plurality of cold air interfaces are circumferentially and equidistantly distributed on the outer side of the gas collecting ring, six cold air interfaces are adopted in the embodiment and are commonly connected with a cold air source, and the cold air source can be a cold air storage box or a cold air supply pipeline; a plurality of cold air pipes are communicated between the inner side of the gas collecting ring and the mixing pipe, the cold air pipes are circumferentially distributed outside the mixing pipe at equal intervals, and each cold air pipe penetrates through the first flange plate. The mixing pipe is internally provided with a gas collecting cavity communicated with a gas collecting ring, the gas collecting cavity is provided with three rows of cold air mixing hole groups, each row of cold air mixing hole group consists of a plurality of cold air mixing holes which are circumferentially arranged on the gas collecting cavity at equal intervals, one row of cold air mixing hole groups are arranged between the left side of the gas collecting cavity and the sealing end surface of the flange, two rows of cold air mixing hole groups which are arranged in a staggered mode are arranged between the inner side of the gas collecting cavity and the inner wall of the mixing pipe, and cold air passing through a cold air interface can form a cold air film along the inner wall of the mixing pipe by means of the gas collecting ring, the gas collecting cavity and the cold air mixing holes, so that the condition that the wall surface of the mixing pipe is ablated by hot air (.
The right side of mixing pipe and the left side of steady flow tube all are equipped with the same second ring flange to can be in the same place mixing pipe and steady flow tube fixed connection with the help of the second ring flange, steady flow tube adopts the equal diameter pipe, can strengthen the mixing effect of these two air currents of hot-air and air conditioning with the help of equal diameter pipe, has improved the homogeneity in flow field, and the internal diameter of steady flow tube equals with the diameter of mixing pipe export widest department. The shunt pipe and the overflow pipe are arranged at the right end of the flow stabilizing pipe in parallel up and down, so that redundant mixing flow is discharged under the condition of realizing set test inflow.
The right side of the flow stabilizing tube and the left side of the flow dividing tube are both provided with a third flange plate, so that the flow stabilizing tube and the flow dividing tube can be fixedly connected together by virtue of the third flange plate; the shunt tubes are composed of a main path outlet pipe and a bypass outlet pipe which are arranged in parallel up and down, the main path outlet pipe is connected with the transition pipe, the bypass outlet pipe is connected with the drainage pipe, and redundant mixing flow is discharged under the condition of realizing the set test inflow.
The right side outlet of the main path outlet pipe and the left side inlet of the transition pipe are respectively provided with a fourth flange plate, the main path outlet pipe and the transition pipe can be connected together by means of the two fourth flange plates, and the moving directions of the main path outlet pipe and the transition pipe and the incoming flow direction of the air in the flow stabilizing pipe are kept on the same straight line. A first throttling pore plate is arranged between the transition pipe and the main path outlet pipe, the first throttling pore plate is connected to a fourth flange of the transition pipe through an inner screw, a fifth flange is arranged on the right side of the transition pipe, and the fifth flange is connected with the test model.
The outlet of the bypass outlet pipe and the inlet of the overflow pipe are respectively provided with a sixth flange plate, the bypass outlet pipe and the overflow pipe can be fixedly connected together by means of the two sixth flange plates, the left end of the overflow pipe is a bent pipe, the trend of the overflow pipe and the incoming flow direction of air in the flow stabilizing pipe are not on the same straight line, the overflow pipe in the embodiment is composed of two overflow pipelines in a shape like an L and a shape like a straight line, the joints of the two overflow pipes are respectively provided with a seventh flange plate, a second orifice plate is arranged in the overflow pipe and connected in the seventh flange plate through inner screws, the first orifice plate and the second orifice plate are both of circular flat plate structures with orifices in the centers, and screws used on the first orifice plate and the second orifice plate are high-temperature-resistant titanium alloy screws. First orifice plate and second orifice plate simple structure, easy dismounting through the orifice plate of the different throttle apertures of replacement, can realize air mass flow's regulation fast. Compared with a high-temperature regulating valve, the structure is simpler and more reliable, and the cost is greatly reduced.
And eighth flange discs are arranged at the joints of the right end of the overflow pipe and the overflow venturi, and the overflow pipe and the overflow venturi can be fixedly connected together by virtue of the two eighth flange discs. The overflow venturi is arranged at the right end of the overflow pipe and adopts a throat water cooling structure.
The working process of the scheme is as follows: the mixing pipe in the scheme is connected with hot air at the outlet of the combustion heater, cold air provided by a cold air source enters the air collecting ring through the cold air interface and is injected into the mixing pipe through the cold air mixing hole, and the air collecting cavity can be used for mixing and cooling the hot air of the mixing pipe after rectifying the cold air; the cooled mixed air flows through the flow stabilizing pipe and is further mixed uniformly. The mixing air flowing through the flow stabilizing pipe respectively enters the branch pipe and is divided into two paths of air of a main path outlet pipe and a bypass outlet pipe, the mixing air flowing through the main path outlet pipe passes through the first throttling orifice plate and the transition pipe and then is connected with the test model to complete the test, and the air incoming flow temperature of the test model is adjusted through the mixing flow of cold air in the mixing pipe. Under the condition that the temperature and the flow of hot air at the outlet of the combustion heater are not changed, the larger the mixing flow of cold air at the mixing section is, the lower the temperature of incoming air flow of the transition pipe is. Taking a certain oxyhydrogen combustion heater as an example, the total temperature of hot air at the outlet of the heater is about 1200K at the lowest, and the flow rate is 1.5kg/s at the lowest. When the flow rate of the blended cold air is 5 times (namely 7.5kg/s) of that of the hot air at the outlet of the heater, the total temperature of the blended incoming air flow can be reduced to 400K, and the total temperature index of all sub/supersonic speed working conditions can be basically covered. When the inner diameter of the inlet at the left side of the mixing pipe in the embodiment is 160mm, the cold air injection and the rapid mixing of more than 8kg/s can be realized, and the air flow requirement of most of the direct connection type tests of the engine combustion chamber at present can be covered. If the air flow demand of the direct connection type test is larger, the size of the blender can be correspondingly enlarged according to the structure.
And the mixing air flowing through the bypass outlet pipe of the shunt pipe can enter the overflow venturi after passing through the overflow pipe and the second throttling orifice plate, so that the overflow flow is measured by means of the water-cooling venturi and a cold flow calibration method, the measurement of the inflow flow of the mixing air of the test model is indirectly realized, and the redundant mixing air can be discharged.
The method used for flow regulation in this example is as follows: most of the existing design schemes only adjust the air flow on one pipeline, and the other pipeline adopts a fixed throat. Assuming a total air flow of
The transition duct has an air flow of
The overflow tube has an air flow of
Total pressure of the steady flow tube is P0wTotal temperature of T0The equivalent orifice area of the transition pipe (i.e., the first orifice plate) is AtestOrifice equivalent of the overflow pipe (i.e. second orifice plate)Area is AoverThe formula of the choked flow can be obtained as follows:
as can be seen from the above formula, if AoverAt constant total air flow
Adjusting the orifice area A of the transition pipe without changingtestThe air flow of the transition pipe is changed, the total pressure of the steady flow section is correspondingly changed, and the adjusting range is limited. With simultaneous adjustment of the orifice plates of this embodiment, i.e. AtestAnd AoverSimultaneously, and the trends are opposite, not only the regulation efficiency (A) is improvedover/AtestThe ratio of (A) is changed more quickly), and the total pressure of the steady flow section can be kept unchanged (A is kepttest+AoverConst may suffice). The applicable working condition range of the scheme is enlarged. The air flow required by the transition duct can be obtained by the double orifice plate regulation of this embodiment, but the air flow is also measured accurately to obtain accurate test parameters.
The existing high-temperature orifice plate flowmeter is complex in structure and high in cost, and has the problem that high-temperature and combustion pollution media affect measurement. The main measurement method is as follows: total flow is measured on cold flow field of air, hydrogen, oxygen, kerosene and other supply pipelines of test bed
Calibrating; in the test and debugging stage, the flow passage of the transition pipe is firstly blocked by the baffle plate to lead the flow of all polluted air to flow
The total pressure P 'of the venturi is measured through a water-cooled venturi of the overflow pipeline'0venAccording to the flow formula:
can obtain the constant term K of the polluted air passing through the water-cooling venturi tube under the condition of the heater and the mixing stateconta(ii) a During the formal test, the working condition and the mixing state of the heater are maintained, and then
KcontaAnd T0The isoparametric is not changed, and the ratio of the flow rate to the total pressure of the water-cooling venturi is also not changed. Opening the transition tube passage, wherein the total pressure of the venturi tube is measured as P0venThen, the flow of polluted air through the water-cooled venturi can be obtained as follows:
the contaminated air flow entering the transition duct and the test model is then:
as can be seen from the formula (5), the method for measuring the overflow section water-cooling venturi combined with the cold flow calibration only needs to carry out more debugging times for completely blocking one transition pipe, and measures the total flow of the cold flow field of the supply pipeline
And total pressure P 'of water-cooled venturi for debugging train number'0venAnd then the total pressure P of the water-cooling venturi tube measured by formal test is combined0venThe flow rate of the polluted air of the transition pipe can be calculated by the formula (5)
The method has the advantages of less required measurement parameters, simple calculation method, independence on polluted air components and the like.
The foregoing are merely examples of the present invention and common general knowledge of known specific structures and/or features of the schemes has not been described herein in any greater detail. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (5)
1. A direct-connected test bench air supply governing system which characterized in that: the mixing pipe is horn-shaped in cross section, a gas collecting ring is communicated outside the mixing pipe, a cold air interface is arranged on the gas collecting ring, a gas collecting cavity communicated with the gas collecting ring is arranged in the mixing pipe, and a plurality of cold air mixing holes are formed in the gas collecting cavity; the flow stabilizing pipe is an equal-diameter pipe, and the inner diameter of the flow stabilizing pipe is equal to the diameter of the widest part of the outlet of the mixing pipe; the inlet of shunt tubes is connected with the outlet of the flow stabilizing tube, the shunt tubes are composed of a main path outlet pipe and a bypass outlet pipe which are arranged in parallel, the main path outlet pipe is connected with a transition pipe, a first throttling pore plate is arranged between the transition pipe and the shunt tubes, the bypass outlet pipe is connected with an overflow pipe, a second throttling pore plate is arranged in the overflow pipe, and an overflow Venturi is arranged at the outlet of the overflow pipe.
2. A direct connect test stand air supply conditioning system as claimed in claim 1, wherein: the cold air mixing holes are arranged in three rows, any one row of the cold air mixing holes is arranged on the sealing end face of the mixing pipe inlet, and the other two rows of the cold air mixing holes are arranged on the inner wall of the mixing pipe inlet in a staggered mode.
3. A direct connect test stand air supply conditioning system as claimed in claim 1, wherein: the orifice plate is of a circular flat plate structure, and the center of the orifice plate is provided with an orifice with the same diameter.
4. A direct connection test stand air supply conditioning system according to any one of claims 1-3, characterized in that: the air flow regulating formulas in the transition pipe and the overflow pipe are as follows: assuming that the total air flow is
The transition duct has an air flow of
The overflow tube has an air flow of
Total pressure of the steady flow tube is P0wTotal temperature of T0The equivalent orifice area of the transition pipe (i.e., the first orifice plate) is AtestThe equivalent orifice area of the overflow pipe (i.e., the second orifice plate) is AoverThe formula of the choked flow can be obtained as follows:
5. a direct connection test stand air supply conditioning system according to any one of claims 1-3, characterized in that: the method for measuring the air flow in the overflow venturi comprises the following steps: total flow is measured on cold flow field of air, hydrogen, oxygen, kerosene and other supply pipelines of test bed
Calibrating; in the test and debugging stage, the flow passage of the transition pipe is firstly blocked by the baffle plate to lead the flow of all polluted air to flow
The total pressure P 'of the venturi is measured through a water-cooled venturi of the overflow pipeline'0venAccording to the flow formula:
can obtain constant term K of the heater and the polluted air in a mixed stateconta(ii) a During the formal test, the working condition and the mixing state of the heater are maintained, and then
KcontaAnd T0Opening the passage of the transition pipe when the parameters are unchanged, wherein the total pressure of the venturi pipe is measured at the moment0venThen, the flow of polluted air through the water-cooled venturi can be obtained as follows:
the polluted air flow entering the transition duct is then:
as can be seen from the formula (5), the method for measuring the overflow section water-cooling venturi combined with the cold flow calibration only needs to carry out more debugging times for completely blocking one transition pipe, and measures the total flow of the cold flow field of the supply pipeline
And total pressure P 'of water-cooled venturi for debugging train number'0venAnd then the total pressure P of the water-cooling venturi tube measured by formal test is combined0venThe flow rate of the polluted air of the transition pipe can be calculated by the formula (5)
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| CN202110160408.5A CN112816219B (en) | 2021-02-05 | Direct-connected test bed air supply adjusting system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116067610A (en) * | 2023-04-06 | 2023-05-05 | 中国空气动力研究与发展中心空天技术研究所 | Cold and hot air flow mixing device capable of adjusting air flow temperature in wide range under low Mach number |
| CN117109930A (en) * | 2023-10-23 | 2023-11-24 | 中国空气动力研究与发展中心空天技术研究所 | Multipath parameter adjustment direct-connected test platform under low total temperature condition |
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| CN116067610A (en) * | 2023-04-06 | 2023-05-05 | 中国空气动力研究与发展中心空天技术研究所 | Cold and hot air flow mixing device capable of adjusting air flow temperature in wide range under low Mach number |
| CN116067610B (en) * | 2023-04-06 | 2023-06-02 | 中国空气动力研究与发展中心空天技术研究所 | Cold and hot air flow mixing device capable of adjusting air flow temperature in wide range under low Mach number |
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| CN117109930B (en) * | 2023-10-23 | 2023-12-26 | 中国空气动力研究与发展中心空天技术研究所 | Multipath parameter adjustment direct-connected test platform under low total temperature condition |
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