CN113433033A - Simulation device for flow and heat transfer characteristics of water-oil mixture in regenerative cooling channel - Google Patents
Simulation device for flow and heat transfer characteristics of water-oil mixture in regenerative cooling channel Download PDFInfo
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- CN113433033A CN113433033A CN202110760158.9A CN202110760158A CN113433033A CN 113433033 A CN113433033 A CN 113433033A CN 202110760158 A CN202110760158 A CN 202110760158A CN 113433033 A CN113433033 A CN 113433033A
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- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
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Abstract
The invention relates to a device for simulating the flow and heat transfer characteristics of a water-oil mixture in a regenerative cooling channel, belonging to the field of flow and heat transfer characteristic simulation. The invention is composed of a storage tank, a filter, a constant flow pump, a flowmeter, a tee joint, a preheating section, a cross joint, a secondary heating section, a cooling device, a filter, a back pressure valve, a kerosene recovery device, a gas-liquid separator, a wet gas flowmeter, a gas collecting device, a liquid collecting device, a measuring and controlling computer, a data collecting device, a temperature sensor, a wall temperature sensor, a pressure sensor and a high-pressure gas source. The functions of accurately inputting working media, mixing in sections, heating, separating and collecting products are realized, and the mixing and cracking of the kerosene and water mixture in the cooling channel of the scramjet engine can be simulated. The problem of obtaining the flow and heat transfer characteristics of the mixture of kerosene and water in the cooling channel of the scramjet engine is solved. The device has the advantages of convenience in use, stable work, accurate working condition, good safety and the like.
Description
Technical Field
The invention relates to a device for simulating the flow and heat transfer characteristics of a water-oil mixture in a regenerative cooling channel, belonging to the field of flow and heat transfer characteristic simulation.
Background
The temperature of the kerosene in the regenerative cooling channel of the scramjet engine is gradually increased after absorbing a large amount of heat, and when the temperature exceeds 500 ℃, the kerosene is thermally cracked. Thermal cracking can bring a plurality of benefits such as improving fuel heat sink, enhancing mixing effect and improving combustion performance, but the coking and carbon deposition phenomena generated therewith can block a cooling channel, influence the performance of an engine and threaten flight safety. The steam catalytic reforming can relieve the problem of coking and carbon deposition to a certain extent, and can effectively increase the heat absorption capacity of the fuel. However, since kerosene and water are difficult to be mutually soluble, it is still very difficult to study the flow and heat transfer characteristics of the mixture under laboratory conditions.
The current research on water-oil mixtures is mainly carried out in static containers. The characteristics of the mixed product were studied by adding the fuel and water simultaneously or in portions in a fixed vessel and heating them under pressure. This approach, while simple and convenient, is far from the actual operating conditions of a scramjet engine. Furthermore, the fuel in the regenerative cooling channel is flowing continuously, and the static characteristic is obviously not suitable for explaining the dynamic problem. In addition, although the cracked product after reaction in the static container is convenient for analysis and treatment, it is difficult to study the common characteristics such as pressure drop characteristic, thermoacoustic instability characteristic and heat transfer characteristic in the static container.
A few researchers have added a certain proportion of emulsifier to kerosene and water and stirred them to an emulsified state, and then introduced them into a stainless steel pipe to study their flow and heat transfer characteristics. However, the retention time of the emulsified fuel is very limited, and the property of the emulsifier after absorbing heat in the cooling channel is not clear, which greatly restricts the application range. To achieve the effect of adding water to the cooling channel of the scramjet engine to reduce the coking amount, the water and kerosene must be supplied separately in advance in a ground experiment to be closer to the working state of the engine, and the stability of the supply system is ensured.
Disclosure of Invention
In view of the above, the present invention provides a device for simulating the flow and heat transfer characteristics of a mixture of kerosene and water in a cooling channel of a scramjet engine, which draws water and kerosene at a constant volume flow rate, mixes and heats the water and kerosene, and collects the resulting mixture, so as to reliably, stably, conveniently and long-term simulate the flow and heat transfer characteristics of the mixture of kerosene and water in the cooling channel of the scramjet engine.
The technical scheme adopted by the invention is as follows:
a water-oil mixture flow and heat transfer characteristic simulator within a regenerative cooling passage, the simulator comprising: the system comprises a water-oil supply system, a two-stage heating system, a cooling recovery system, a cracking product acquisition system, a data acquisition system and a high-pressure air source;
the water-oil supply system comprises two groups of liquid supply devices which are respectively used for supplying water and kerosene; each set of liquid supply device is sequentially connected with a storage tank, a filter, a constant flow pump and a flowmeter through pipelines, and the two liquids are mixed by a tee joint and then flow into a two-stage heating system;
the two-stage heating system comprises a preheating section for preheating the mixed fluid and a two-stage heating section for completing liquid temperature rise, and the two heating pipelines are heated by thermocouples;
the cooling recovery system comprises a cooling device for cooling the pyrolysis product and a kerosene recovery device;
the cracking product collecting system comprises a gas-liquid separator, a wet gas flowmeter, a liquid collecting device and a gas collecting device;
the computer in the data acquisition system is connected with the temperature sensors and the pressure sensors which are positioned at the two four-way joints and the wall temperature sensor which is positioned at the secondary heating section through the data acquisition device, the temperature, the pressure and the wall temperature of the fluid are acquired and analyzed, and the acquired data are gathered in the computer;
a high-pressure gas cylinder filled with nitrogen in the high-pressure gas source is connected between the water-oil supply system and the two-stage heating system through a pipeline, so that blowing after an experiment is convenient;
all systems and all components of the simulation device are connected through pipelines, and the size of each pipeline is determined by specific test working conditions.
Optimally, two identical constant flow pumps are used in the water and oil supply system to respectively supply water and kerosene so as to ensure the stability of supply and the accuracy of flow.
Optimally, a cooling device in the cooling recovery system is provided with two stages of water tanks so as to ensure the stable water level of cooling water and enhance the cooling capacity of the cooling system.
Optimally, a filtering device is arranged in the cooling and recycling system to remove coke particles generated in the experiment and avoid blocking the experiment pipeline.
Optimally, a back pressure valve is arranged in the cooling recovery system to prevent the product from flowing back and ensure the safety of the experiment.
Optimally, the two-stage heating system uses a thermocouple for heating, and a four-way joint is arranged behind the heating position and is connected with a temperature sensor and a pressure sensor.
Optimally, the high-pressure gas cylinder is arranged for blowing off the test equipment, residual substances in the pipeline are removed after each test, and the interference of the residual substances with the next test is avoided.
Compared with the prior art, the invention has the beneficial effects that:
(1) the simulation effect is good. Compared with the static reaction container, the state of the flowing of the working medium in the regeneration cooling channel is closer; compared with emulsified kerosene, the fuel oil can better meet the application of scramjet engines.
(2) The research range is wide. Pressure drop, heat transfer, cracking, and thermoacoustic instability characteristics in the regeneration cooling channel can be studied with only the need to replace the sensor.
(3) The working time is long. The high-pressure constant flow pump is adopted as a supply system, and water and kerosene do not need to be treated at all, so that the working time can be kept longer.
(4) The supply state is stable. The flow of the fluid pumped by the high-pressure constant flow pump is basically kept constant, and the stability of water and kerosene supply in the test process is effectively ensured.
(5) The expansion capability is strong. The experimental facility can be convenient change connecting line and adjust test parameter to the needs of different operating modes of simulation.
Drawings
FIG. 1 is a schematic diagram of an experimental system.
The reference numbers illustrate:
1-Water oil supply System
11. 15-storage tank, 12, 16-filter, 13, 17-constant flow pump, 14, 18-flowmeter, 19-tee joint;
2-two stage heating system
21-preheating section, 22-four-way I, 23-secondary heating section and 24-four-way II
3-Cooling recovery System
31-cooling unit, 32-filter, 33-back pressure valve, 34-kerosene recovery unit
4-cracking product collection system
41-gas-liquid separator, 42-wet gas flowmeter, 43-gas collecting device and 44-liquid collecting device
5-data acquisition system
51-measurement and control computer, 52-data acquisition device, 53, 54-temperature sensor, 55-wall temperature sensor, 56, 57-pressure intensity
Sensor with a sensor element
6-high pressure gas source
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
The experimental system is shown in figure 1.
A water-oil mixture flow and heat transfer characteristic simulator within a regenerative cooling passage, the simulator comprising: the system comprises a water-oil supply system 1, a two-stage heating system 2, a cooling recovery system 3, a cracking product acquisition system 4, a data acquisition system 5 and a high-pressure gas source 6;
the water-oil supply system comprises two groups of liquid supply devices which are respectively used for supplying water and kerosene; each set of liquid supply device is sequentially connected with storage tanks 11 and 15, filters 12 and 16, constant flow pumps 13 and 17 and flow meters 14 and 18 through pipelines, and the two liquids are mixed by a tee joint 19 and then flow into a two-stage heating system;
the two-stage heating system comprises a preheating section 21 for preheating the mixed fluid and a two-stage heating section 23 for completing liquid temperature rise, and the two sections of heating pipelines are heated by thermocouples;
the cooling recovery system comprises a cooling device 31 for cooling the cracked product and a kerosene recovery device 34;
the cracking product collecting system comprises a gas-liquid separator 41, a wet gas flowmeter 42, a gas collecting device 43 and a liquid collecting device 44;
the measurement and control computer 51 in the data acquisition system is connected with the temperature sensors 53 and 54 and the pressure sensors 56 and 57 positioned at the two four- way joints 22 and 24 and the wall temperature sensor 55 positioned at the secondary heating section through the data acquisition device 52, the temperature, the pressure and the wall temperature of the fluid are acquired and analyzed, and the acquired temperature and pressure data are summarized in the measurement and control computer;
the high-pressure gas cylinder 6 is connected between the water and oil supply system and the two-stage heating system through a pipeline, so that blowing after an experiment is convenient;
all systems and all components of the simulation device are connected through pipelines, and the size of each pipeline is determined by specific test working conditions.
Optimally, two constant flow pumps 13 and 17 with the same model are used in the water and oil supply system 1 to respectively supply water and kerosene so as to ensure the stability of supply and the accuracy of flow.
Optimally, the cooling device 31 in the cooling recovery system 3 is provided with two stages of water tanks to ensure the stable water level of the cooling water and enhance the cooling capacity of the cooling system.
Preferably, a filter 32 is provided in the cooling recovery system 3 to remove coke particles generated during the test and to avoid clogging the test lines.
Optimally, a back pressure valve 33 is arranged in the cooling and recovering system 3 to prevent the product from flowing back and ensure the safety of the experiment.
Optimally, the two-stage heating system 2 uses thermocouples for heating and is followed by four- way connections 22, 24 connecting temperature sensors 53, 54 and pressure sensors 56, 57.
Preferably, a high-pressure gas cylinder 6 filled with nitrogen is arranged for blowing off the test equipment, and residual substances in the pipeline are removed after each test so as to avoid interference with the next test.
Example (b):
in the experiment process, two constant flow pumps 13 and 17 respectively pump kerosene and water from storage tanks 11 and 15 through filters 12 and 16 at set volume flow rates, and the kerosene and the water are mixed at a tee joint 19 at an outlet of the water-oil supply system 1. During this process the flow meters 14, 18 measure the actual flow of the two fluids, respectively.
The mixed liquid is heated in a two-stage heating system 2. Where 21 is a preheating section to facilitate mixing of kerosene and water in the pipeline by preheating. And a temperature sensor and a pressure sensor which are arranged at the first four-way joint 22 measure the temperature and the pressure of the preheated mixed fluid. The pre-heated mixed fluid is heated in the secondary heating section 23 to the temperature required for the experiment. The heated fluid undergoes a second temperature pressure measurement at cross two 21.
The mixed fluid is cooled and recovered in the cooling and recovering system 3. The mixed fluid is sequentially cooled by a cooling device 31, coke particles in the cracking product are filtered by a filter 32, kerosene contained in the mixed fluid passes through a back pressure valve 33 and enters a kerosene recovery tank 34, and the rest experimental products enter a cracking product collection system 4.
The products entering the cracking product collection system 4 are subjected to gas-liquid separation by a gas-liquid separation device 41, the meteorological products enter a gas product collection device 43 by a wet gas flowmeter 42, and the liquid products enter a liquid product collection device 44.
In the experiment process, the measurement and control computer 51 collects experimental data and monitors working conditions through the data acquisition device 52, so that accidents are avoided.
After the test is finished, the filter element of the filter 32 is cleaned and blown off by using the high-pressure gas cylinder 6, so that residual cracking products and kerosene in the device are eliminated, and the interference of the residual cracking products and kerosene in the next test is avoided.
When the working condition is adjusted, parameters such as mass flow, water-oil ratio, pressure, heat flow density and the like of the mixture of kerosene and water in the experimental section can be adjusted by adjusting the constant flow pumps 13 and 17, the back pressure valve 33 and the secondary heating section 23; changing the size parameters of the pipeline at the experimental section by changing the length and the size of the pipeline at the experimental section; different fixing modes are adopted for the experimental section pipeline, and the influence of the flowing direction and the inclination angle of the pipeline on the experimental result can be researched. Further, the flow and heat transfer characteristics of the fuel or water can be separately studied with only the constant flow pump 13 or 17.
While the foregoing specification illustrates and describes embodiments of the invention in its application, it is to be understood that the invention is not limited to the precise form disclosed herein and that modifications and other embodiments are not to be considered as exclusive of other embodiments, but may be used in various other combinations, modifications and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A simulation apparatus for simulating a flow and heat transfer characteristic of a water-oil mixture in a regenerative cooling passage, the simulation apparatus comprising: the system comprises a water-oil supply system, a two-stage heating system, a cooling recovery system, a cracking product acquisition system, a data acquisition system and a high-pressure air source;
the water-oil supply system comprises two groups of liquid supply devices which are respectively used for supplying water and kerosene; each set of liquid supply device is sequentially connected with a storage tank, a filter, a constant flow pump and a flowmeter through pipelines, and the two liquids are mixed by a tee joint and then flow into a two-stage heating system;
the two-stage heating system comprises a preheating section for preheating the mixed fluid and a two-stage heating section for completing liquid temperature rise, and the two heating pipelines are heated by thermocouples;
the cooling recovery system comprises a cooling device for cooling the pyrolysis product and a kerosene recovery device;
the cracking product collecting system comprises a gas-liquid separator, a wet gas flowmeter, a liquid collecting device and a gas collecting device;
the computer in the data acquisition system is connected with the temperature sensors and the pressure sensors which are positioned at the two four-way joints and the wall temperature sensor which is positioned at the secondary heating section through the data acquisition device, the temperature, the pressure and the wall temperature of the fluid are acquired and analyzed, and the acquired data are gathered in the computer;
a high-pressure gas cylinder filled with nitrogen in the high-pressure gas source is connected between the water-oil supply system and the two-stage heating system through a pipeline, so that blowing after an experiment is convenient;
all systems and all components of the simulation device are connected through pipelines, and the size of each pipeline is determined by specific test working conditions.
2. The apparatus for simulating the flow and heat transfer characteristics of a water-oil mixture in a regenerative cooling passage according to claim 1, wherein two identical constant flow pumps are used in the water-oil supply system to supply water and kerosene, respectively, so as to ensure the stability of supply and the accuracy of flow rate.
3. The apparatus for simulating the flow and heat transfer characteristics of a water-oil mixture in a regenerative cooling passage according to claim 1, wherein two stages of water tanks are provided in the cooling apparatus in the cooling recovery system to ensure a stable water level of the cooling water and enhance the cooling capacity of the cooling system.
4. The apparatus for simulating the flow and heat transfer characteristics of a water-oil mixture in a regenerative cooling passage according to claim 1, wherein a filter is disposed in the cooling recovery system to remove coke particles generated during the test and to prevent the test line from being clogged.
5. The apparatus for simulating the flow and heat transfer characteristics of a water-oil mixture in a regenerative cooling passage as defined in claim 1, wherein a back pressure valve is provided in the cooling recovery system to prevent the backflow of the product and ensure the safety of the experiment.
6. The apparatus for simulating the flow and heat transfer characteristics of a water-oil mixture in a regenerative cooling passage as defined in claim 1, wherein the two-stage heating system uses a thermocouple for heating, and a cross is provided after the heating position to connect the temperature sensor and the pressure sensor.
7. The apparatus for simulating the flow and heat transfer characteristics of a water-oil mixture in a regenerative cooling passage as defined in claim 1, wherein a high-pressure gas cylinder is provided for blowing off the test equipment, and the residual substances in the pipeline are removed after each test to avoid interference with the next test.
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| CN202110760158.9A CN113433033A (en) | 2021-07-06 | 2021-07-06 | Simulation device for flow and heat transfer characteristics of water-oil mixture in regenerative cooling channel |
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| CN202110760158.9A CN113433033A (en) | 2021-07-06 | 2021-07-06 | Simulation device for flow and heat transfer characteristics of water-oil mixture in regenerative cooling channel |
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2021
- 2021-07-06 CN CN202110760158.9A patent/CN113433033A/en active Pending
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Application publication date: 20210924 |