CN111636966B - Engine and cooling system thereof - Google Patents
Engine and cooling system thereof Download PDFInfo
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- CN111636966B CN111636966B CN202010470910.1A CN202010470910A CN111636966B CN 111636966 B CN111636966 B CN 111636966B CN 202010470910 A CN202010470910 A CN 202010470910A CN 111636966 B CN111636966 B CN 111636966B
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- inlet
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- peripheral wall
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/12—Cooling of plants
- F02C7/16—Cooling of plants characterised by cooling medium
- F02C7/18—Cooling of plants characterised by cooling medium the medium being gaseous, e.g. air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention discloses an engine and a cooling system thereof, wherein the engine comprises a peripheral wall, a cooling channel which penetrates through the engine along the length direction of the peripheral wall is arranged in the peripheral wall, the peripheral wall is provided with a first inlet and a second inlet, the first inlet and the second inlet are communicated with the cooling channel, and the cooling system comprises: the device comprises a storage device, a first connecting pipe and a second connecting pipe, wherein the storage device is used for storing endothermic hydrocarbon fuel; one end of the first connecting pipe is communicated with the storage device, and the other end of the first connecting pipe is communicated with the first inlet, so that the heat absorption type hydrocarbon fuel can enter the cooling channel through the first connecting pipe and the first inlet; the other end of the second connecting pipe is communicated with the second inlet, so that the heat absorption type hydrocarbon material enters the cooling channel through the second connecting pipe and the second inlet; the first inlet and the second inlet are arranged at intervals in the length direction of the peripheral wall, and the engine performance can be improved and the safety of the aircraft is ensured.
Description
Technical Field
The invention relates to the technical field of aerospace thermal protection, in particular to a cooling system of an engine and the engine with the cooling system.
Background
The thermal load on the outer wall of the ramjet engine is very high and active thermal protection is required to protect the outer wall of the engine. In the related art, a cooling medium enters a cooling passage from one end of an outer wall of an engine, continuously absorbs heat in the process of flowing along the outer wall, simultaneously cools the outer wall of the engine, and finally flows out from the other end of the outer wall of the engine. However, the cooling methods in the related art are liable to affect engine performance and aircraft safety.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
To this end, an embodiment of the present invention provides a cooling system for an engine, which can improve the performance of the engine and ensure the safety of an aircraft.
Another embodiment of the present invention is directed to an engine.
According to an embodiment of a first aspect of the present invention, there is provided a cooling system for an engine including a peripheral wall in which a cooling passage penetrating the engine substantially in a longitudinal direction of the peripheral wall is provided, the peripheral wall being provided with a first inlet and a second inlet, the first inlet and the second inlet communicating with the cooling passage, the cooling system including: a reservoir for storing an endothermic hydrocarbon fuel; a first connection pipe, one end of which is connected to the reservoir and the other end of which is communicated with the first inlet, so that the endothermic hydrocarbon fuel can enter the cooling passage through the first connection pipe and the first inlet; a second connection pipe, one end of which is connected to the reservoir and the other end of which is communicated with the second inlet, so that the heat absorption type hydrocarbon material enters the cooling channel through the second connection pipe and the second inlet; the first inlet and the second inlet are arranged at an interval in the length direction of the peripheral wall, the second inlet is located downstream of the first inlet in the flow direction of the endothermic hydrocarbon fuel in the cooling passage, the endothermic hydrocarbon fuel entering the cooling passage from the first inlet has undergone a certain degree of thermal cracking chemical reaction when flowing to a position in the cooling passage corresponding to the second inlet, and the endothermic hydrocarbon fuel entering the cooling passage from the second inlet is instantaneously heated and undergoes thermal cracking chemical reaction.
According to the cooling system of the engine provided by the embodiment of the invention, the first inlet and the second inlet which are arranged at intervals along the length of the cooling channel fully utilize the space effect of thermal cracking chemical reaction, the thermal cracking heat absorption performance of a cooling medium can be effectively improved, and the temperature and the cracking rate of hydrocarbon fuel are lower under the condition of the same thermal load, so that the coking amount can be reduced, the cooling channel is prevented from being blocked, the heat transfer capacity of the cooling channel is improved, the performance of the engine is improved, and the safety of an aircraft is ensured.
In some embodiments, the first inlet is disposed at the first end surface of the peripheral wall, and the distance between the second inlet and the first end surface of the peripheral wall is greater than the distance between the second inlet and the second end surface of the peripheral wall.
In some embodiments, the temperature of the endothermic hydrocarbon material flowing out of the cooling passage is a first preset temperature, the temperature of the endothermic hydrocarbon fuel entering the cooling passage from the first inlet is a second preset temperature when the endothermic hydrocarbon fuel flows to a position corresponding to the second inlet in the cooling passage, the second preset temperature is lower than the first preset temperature, and the difference between the first preset temperature and the second preset temperature is greater than or equal to 10 ℃ and less than or equal to 100 ℃.
In some embodiments, the cooling system of the engine further includes a first control valve provided on the first nipple to control a flow rate of the endothermic hydrocarbon fuel flowing from the first inlet into the cooling passage, and a second control valve provided on the second nipple to control a flow rate of the endothermic hydrocarbon fuel flowing from the second inlet into the cooling passage.
In some embodiments, the cooling system of the engine further comprises a measuring device for detecting a temperature of the endothermic hydrocarbon fuel at a position within the cooling passage corresponding to the second inlet.
In some embodiments, the temperature of the endothermic hydrocarbon fuel at a location within the cooling passage corresponding to the second inlet is maintained at the second preset temperature by adjusting at least one of the first control valve and the second control valve.
In some embodiments, the number of the cooling passages is plural, the plural cooling passages are arranged at intervals along the circumferential direction of the circumferential wall, the first inlets and the second inlets are plural respectively, the plural first inlets correspond to the plural cooling passages one to one, and the plural second inlets correspond to the plural cooling passages one to one.
In some embodiments, the peripheral wall of the engine is further provided with a third inlet, the third inlet being in communication with the cooling channel, the third inlet being located downstream of and spaced from the second inlet in the flow direction.
In some embodiments, the engine further includes a combustion chamber surrounded by the peripheral wall, the peripheral wall being provided with at least one of a jet plate and a cavity, and the endothermic hydrocarbon fuel flowing from the cooling passage is injected into the combustion chamber through the at least one of the jet plate and the cavity.
According to an embodiment of the second aspect of the present invention, there is provided an engine including a cooling system of the engine of the embodiment of the first aspect.
According to the engine provided by the embodiment of the invention, the engine cooling system fully utilizes the space effect of thermal cracking chemical reaction through the first inlet and the second inlet which are arranged at intervals along the length of the cooling channel, the thermal cracking heat absorption performance of a cooling medium can be effectively improved, and the temperature and the cracking rate of hydrocarbon fuel are lower under the condition of the same thermal load, so that the coking amount can be reduced, the cooling channel is prevented from being blocked, the heat transfer capacity of the cooling channel is improved, the performance of the engine is more stable, and the safety of an aircraft is ensured.
Drawings
Fig. 1 is a schematic configuration diagram of a cooling system of an engine according to an embodiment of the present invention.
FIG. 2 is a schematic illustration of an engine according to an embodiment of the present invention.
FIG. 3 is a mass fraction of endothermic hydrocarbon fuel within the cooling passages of the engine of the present invention.
Fig. 4 is a temperature distribution of the endothermic hydrocarbon fuel in the cooling passages of the engine of the present invention.
FIG. 5 is a mass fraction of an endothermic hydrocarbon fuel within a cooling gallery of a prior art engine.
Fig. 6 is a temperature distribution of endothermic hydrocarbon fuel in a cooling passage of a conventional engine.
Reference numerals:
the device comprises a storage 1, a pump 2, a first control valve 3, a second control valve 4, a third control valve 5, an oil injection controller 6, a peripheral wall 7, a cooling channel 8, a first inlet 9, a second inlet 10, a first connecting pipe 11, a second connecting pipe 12, a third inlet 13, a third connecting pipe 14, a combustion chamber 15, a material injection plate 16, a cavity 17 and a fourth connecting pipe 19.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
As shown in fig. 1 and 2, according to the cooling system of the engine of the embodiment of the present invention, the engine includes a peripheral wall 7, a cooling passage 8 penetrating the engine in a length direction of the peripheral wall 7 is provided in the peripheral wall 7, in other words, the cooling passage 8 is horizontally provided in a front-rear direction of the peripheral wall 7 and penetrates the engine, the peripheral wall 7 is provided with a first inlet 9 and a second inlet 10, the first inlet 9 and the second inlet 10 are communicated with the cooling passage 8, and the cooling system includes a reservoir 1, a first connection pipe 11, and a second connection pipe 12. The reservoir 1 is used to store endothermic hydrocarbon fuel.
One end of the first connecting pipe 11 is connected with the reservoir 1, and the other end of the first connecting pipe 11 is communicated with the first inlet 9, so that the heat absorption type hydrocarbon fuel can enter the cooling passage 8 through the first connecting pipe 11 and the first inlet 9.
One end of the second connection pipe 12 is connected to the reservoir 1, and the other end of the second connection pipe 12 is communicated with the second inlet 10, so that the heat absorption type hydrocarbon material enters the cooling passage 8 through the second connection pipe 12 and the second inlet 10.
The first inlet 9 and the second inlet 10 are arranged at intervals in the length direction of the peripheral wall 7, and the second inlet 10 is located downstream of the first inlet 9 in the flow direction of the endothermic hydrocarbon fuel in the cooling passage 8. As shown in fig. 1, the endothermic hydrocarbon fuel flows in the cooling passage 8 in the left-to-right direction, and the second inlet 10 is located on the right side of the first inlet 9.
The endothermic hydrocarbon fuel introduced into the cooling passage 8 from the first inlet 9 has undergone a certain degree of thermal cracking chemical reaction while flowing to the position in the cooling passage 8 corresponding to the second inlet 10, and the endothermic hydrocarbon fuel introduced into the cooling passage 8 from the second inlet 10 is instantaneously heated and starts undergoing thermal cracking chemical reaction.
According to the cooling system of the engine provided by the embodiment of the invention, the first inlet and the second inlet are arranged at intervals along the length direction of the cooling channel, the space effect of thermal cracking chemical reaction is fully utilized, the thermal cracking heat absorption performance of a cooling medium can be effectively improved, and the temperature and the cracking rate of hydrocarbon fuel are lower under the same thermal load condition, so that the coking amount can be reduced, the cooling channel is prevented from being blocked, the heat transfer capacity of the cooling channel is improved, the performance of the engine is improved, and the safety of an aircraft is ensured.
In some embodiments, as shown in fig. 1, the first inlet 9 is provided at a first end surface of the peripheral wall 7 (a left end surface of the peripheral wall 7 as shown in fig. 1), and the distance between the second inlet 10 and the first end surface of the peripheral wall 7 is greater than the distance between the second inlet 10 and a second end surface of the peripheral wall 7 (a right end surface of the peripheral wall 7 as shown in fig. 1).
In some embodiments, the temperature of the endothermic hydrocarbon material flowing out of the cooling passage 8 is a first predetermined temperature, the temperature of the endothermic hydrocarbon fuel entering the cooling passage 8 from the first inlet 9 flowing into the cooling passage 8 to a position corresponding to the second inlet 10 is a second predetermined temperature, the second predetermined temperature is less than the first predetermined temperature, and the difference between the first predetermined temperature and the second predetermined temperature is greater than or equal to 10 ℃ and less than or equal to 100 ℃. The values of the first preset temperature and the second preset temperature are different according to factors such as the specific type of the endothermic hydrocarbon fuel. For example, the endothermic hydrocarbon fuel is an endothermic hydrocarbon fuel having a density of 780kg/m3, the second predetermined temperature is 700 ℃, and the first predetermined temperature is in the range of 710 ℃ to 740 ℃.
In some embodiments, the cooling system of the engine further includes a first control valve 3 and a second control valve 4, the first control valve 3 being provided on the first nipple 11 to control the flow rate of the endothermic hydrocarbon fuel flowing from the first inlet 9 into the cooling passage 8, the second control valve 4 being provided on the second nipple 12 to control the flow rate of the endothermic hydrocarbon fuel flowing from the second inlet 10 into the cooling passage 8.
Preferably, the first control valve 3 and the second control valve 4 in the present embodiment may be flow control valves or flow regulating valves, and it is understood that the type of the first control valve 3 and the second control valve 4 in the present application is not limited thereto as long as it can function as various control valves for controlling the inflow rate of the endothermic hydrocarbon fuel.
In some embodiments, the cooling system of the engine further comprises a measuring device (not shown) for detecting the temperature of the endothermic hydrocarbon fuel at a location within the cooling channel 8 corresponding to the second inlet 10.
Preferably, the measuring device can acquire data by installing a temperature sensor inside the cooling channel or by arranging an extension-type temperature probe in the cooling channel. It should be understood that the measuring device in the present application is not limited thereto, and the data collection manner and the installation manner of the measuring device in the present embodiment may be adaptively adjusted according to the type of the measuring device, as long as the temperature of the endothermic hydrocarbon fuel at the position corresponding to the second inlet 10 in the cooling passage 8 can be measured.
In some embodiments, the temperature of the endothermic hydrocarbon fuel at a location within the cooling passage 8 corresponding to the second inlet 10 is maintained at a second preset temperature by adjusting at least one of the first control valve 3 and the second control valve 4. In other words, the endothermic hydrocarbon fuel flow at the first inlet 9 and the second inlet 10 can be controlled by adjusting the first control valve 3 and/or the second control valve 4, thereby serving to adjust the second preset temperature. For example, the endothermic hydrocarbon fuel has a density of 780kg/m3The second preset temperature is maintained at about 700 c by adjusting the first control valve 3 and/or the second control valve 4.
In some embodiments, as shown in fig. 1, the cooling passage 8 is plural, the plural cooling passages 8 are arranged at intervals along the circumferential direction of the circumferential wall 7, the first inlet 9 and the second inlet 10 are plural respectively, the plural first inlets 9 correspond to the plural cooling passages 8 one by one, and the plural second inlets 10 correspond to the plural cooling passages 8 one by one. When the cooling passages 8 are plural, the cooling passages 8 are each disposed horizontally in the front-rear direction of the peripheral wall 7 and are arranged at intervals from each other, and adjacent cooling passages 8 are parallel to each other and penetrate through the peripheral wall 7 of the engine.
Preferably, as shown in fig. 1, the number of the first inlets 9, the second inlets 10 and the cooling passages 8 is kept uniform.
In some embodiments, the peripheral wall 7 of the engine is further provided with a third inlet 13, the third inlet 13 being in communication with the cooling channel 8, the third inlet 13 being located downstream of the second inlet 10 in the flow direction and being spaced from the second inlet 10. As shown in fig. 1, the third inlet 13 is located at the right side of the second inlet 9, and the endothermic hydrocarbon fuel entering the cooling channel 8 from the third inlet 13 can also be heated instantaneously and begin to undergo the thermal cracking chemical reaction, further improving the heat transfer capacity of the cooling channel.
In some embodiments, as shown in fig. 1, the engine further includes a combustion chamber 15 surrounded by the peripheral wall 7, at least one of a jet plate 16 and a cavity 17 is provided in the peripheral wall 7, and the endothermic hydrocarbon fuel flowing from the cooling passage 8 is injected into the combustion chamber 15 through at least one of the jet plate 16 and the cavity 17.
In some embodiments, as shown in fig. 2, the cooling system of the engine further includes a pump 2, a first opening of the pump 2 is connected to the reservoir 1, a second opening of the pump 2 is connected to a first connecting pipe 11 and a second connecting pipe 12, and the endothermic hydrocarbon fuel in the reservoir 1 is supplied to the first inlet 9 and the second inlet 10 through the first connecting pipe 11 and the second connecting pipe 12, respectively, by driving of the pump 2.
In some embodiments, the cooling system of the engine further comprises a third connecting pipe 14, one end of the third connecting pipe 14 is connected to the reservoir 1, and the other end of the third connecting pipe 14 is communicated with the third inlet 13, so that the endothermic hydrocarbon fuel can enter the cooling channel 8 through the third connecting pipe 14 and the third inlet 13.
Preferably, one end of the third connection pipe 14 is connected to the second opening of the pump 2, and the other end of the third connection pipe 14 is communicated with the third inlet 13. The endothermic hydrocarbon fuel in the reservoir 1 is supplied to the third inlets 13 through the third connection pipes 14, respectively, under the drive of the pump 2.
In some embodiments, the cooling system of the engine further includes a fourth connection pipe 19, the fourth connection pipe 19 collects the endothermic hydrocarbon fuel flowing from the cooling channel 8, the injection controller 6 is connected in series to the fourth connection pipe 19, and the injection controller 6 is respectively communicated with the injection plate 16 and the cavity 17, so that the endothermic hydrocarbon fuel flowing from the cooling channel 8 is injected into the combustion chamber 15 through at least one of the injection plate 16 and the cavity 17.
In some embodiments, the endothermic hydrocarbon fuel may be selected from the group consisting of RP-3 and JP-7, although the endothermic hydrocarbon fuel is not limited thereto.
Some specific exemplary engine cooling systems of the present invention are described below with reference to fig. 1 and 2.
As shown in fig. 1 and 2, the engine includes a peripheral wall 7, a cooling passage 8 is provided in the peripheral wall 7, the cooling passage 8 being horizontally provided in the front-rear direction of the peripheral wall 7 and penetrating through the left and right end faces of the engine, and a cooling medium (endothermic hydrocarbon fuel) in the cooling passage 8 flows in the left-to-right direction.
The peripheral wall 7 is provided with a first inlet 9, a second inlet 10 and a third inlet 13, the first inlet 9 is arranged on the left end face of the peripheral wall 7, the second inlet 10 is arranged on the right side of the first inlet 9, the distance between the second inlet 10 and the left end face of the peripheral wall 7 is larger than the distance between the second inlet 10 and the right end face of the peripheral wall 7, and the third inlet 13 is arranged on the right side of the second inlet 10.
The first inlet 9, the second inlet 10 and the third inlet 13 are all communicated with the cooling channel 8, the number of the cooling channels 8 is multiple, and the multiple cooling channels 8 are arranged at intervals along the circumferential direction of the circumferential wall 7. The number of the first inlets 9, the number of the second inlets 10, and the number of the third inlets 13 are plural, and the plural first inlets 9, the plural second inlets 10, and the plural third inlets 13 are all in one-to-one correspondence with the plural cooling passages 8.
The engine also comprises a combustion chamber 15 enclosed by the peripheral wall 7, the peripheral wall 7 is provided with a material injection plate 16 and a cavity 17, and the endothermic hydrocarbon fuel flowing out of the cooling channel 8 is injected into the combustion chamber 15 through the material injection plate 16 and the cavity 17.
The cooling system of the engine comprises a reservoir 1, a pump 2, a first connecting pipe 11, a second connecting pipe 12 and a third connecting pipe 14. The reservoir 1 is used to store endothermic hydrocarbon fuel as a cooling medium and fuel for the engine.
A first opening of the pump 2 is connected to the reservoir 1, and a second opening of the pump 2 is connected to one end of the first adapter tube 11, one end of the second adapter tube 12, and one end of the third adapter tube 14.
The other end of the first nipple 11 communicates with the first inlet 9 so that the endothermic hydrocarbon fuel can enter the cooling passage 8 through the first nipple 11 and the first inlet 9. The first connection pipe 11 is further provided with a first control valve 3 for controlling the flow of the endothermic hydrocarbon fuel flowing from the first inlet 9 into the cooling passage 8.
The other end of the second connection pipe 12 is communicated with the second inlet 10 so that the heat absorption type hydrocarbon material enters the cooling passage 8 through the second connection pipe 12 and the second inlet 10. The second connection pipe 12 is also provided with a second control valve 4 for controlling the flow of the endothermic hydrocarbon fuel flowing from the second inlet 10 into the cooling channel 8.
The other end of the third adapter tube 14 communicates with the third inlet 13 so that the endothermic hydrocarbon fuel can enter the cooling passage 8 through the third adapter tube 14 and the third inlet 13. The third connection pipe 14 is also provided with a third control valve 5 for controlling the flow of the endothermic hydrocarbon fuel flowing from the third inlet 13 into the cooling passage 8.
The cooling system further comprises a fourth connecting pipe 19, the fourth connecting pipe 19 collects the endothermic hydrocarbon fuel flowing out of the cooling channel 8 together, the fourth connecting pipe 19 is further connected with the fuel injection controller 6 in series, and the liquid outlet end of the fuel injection controller 6 is respectively communicated with the fuel injection plate 16 and the cavity 17, so that the endothermic hydrocarbon fuel flowing out of the cooling channel 8 is injected into the combustion chamber 15 through at least one of the fuel injection plate 16 and the cavity 17.
The operation of the cooling system of some specific exemplary engines of the present invention will now be described with reference to fig. 1 and 2.
When cooling of the peripheral wall 7 of the engine is started, the heat-absorbing hydrocarbon fuel is pumped from the reservoir 1 by the pump 2 and enters the first connecting pipe 11, the second connecting pipe 12 and the third connecting pipe 14 through the first control valve 3, the second control valve 4 and the third control valve 5, the cooling medium entering from the first inlet 9 absorbs heat in the cooling passage 8 of the engine, the heat-absorbing hydrocarbon fuel rises in temperature, the thermal cracking chemical reaction gradually occurs, the thermal cracking chemical reaction has occurred to a certain extent when the heat-absorbing hydrocarbon fuel entering the cooling passage 8 from the first inlet 9 flows to a position corresponding to the second inlet 10, the heat-absorbing hydrocarbon fuel entering the cooling passage 8 from the second inlet 10 is instantaneously heated and starts the thermal cracking chemical reaction, the thermal cracking chemical reaction continues when the heat-absorbing hydrocarbon fuel entering the cooling passage 8 from the second inlet 10 flows to a position corresponding to the third inlet 13, the endothermic hydrocarbon fuel entering the cooling channel 8 from the third inlet 13 is heated instantaneously and starts to undergo a thermal cracking chemical reaction, continues to flow and absorb heat, and so on, finally flows out of the engine wall surface cooling channel 8 and enters the fourth connecting pipe 19, and the fourth connecting pipe 19 collects the endothermic hydrocarbon fuel flowing out of the cooling channel 8.
An injection controller 6 is connected in series to the fourth connection pipe 19, and the injection controller 6 is respectively communicated with the injection plate 16 and the cavity 17, so that the endothermic hydrocarbon fuel flowing out of the cooling passage 8 is injected into the combustion chamber 15 through at least one of the injection plate 16 and the cavity 17.
The advantageous effects of the cooling system of the engine of the present invention will be described below with reference to a specific embodiment.
The length of the cooling channel 8 of the engine is 1.1m, the diameter of the cooling channel 8 is 2mm, and the heat flux density of the wall surface of the combustion chamber 15 is 170kW/m2The temperature at the inlet of the cooling channel 8 is 350 ℃.
In a conventional cooling configuration, the hydrocarbon fuel inlet is one. In the cooling structure of the present invention, the number of hydrocarbon fuel inlets is at least 2, the first inlet 9 is provided on the left end surface of the peripheral wall 7, and the distance between the second inlet 10 and the left end surface of the peripheral wall 7 is 0.8m, that is, the distance between the second inlet 10 and the right end surface of the peripheral wall 7 is 0.3 m.
In a conventional cooling structure, the flow rate of a hydrocarbon fuel inlet is 2.2 kg/h; in the cooling structure of the present invention, the flow rate at the first inlet 9 of the hydrocarbon fuel is 1.8kg/h, and the flow rate at the second inlet 10 is 0.4 kg/h.
The results of the numerical simulation are shown in fig. 3 to 6, and the outlet temperature of the hydrocarbon fuel is 990.1K and the cracking rate is 0.66 in the conventional cooling method. In the cooling method of the present invention, the outlet temperature of the hydrocarbon fuel was 984.4K, and the cracking rate was 0.62. It can be seen that the cooling method of the present invention has lower temperature and cracking rate of hydrocarbon fuel than the conventional cooling method under the same heat load condition, so that the coking amount can be reduced.
The engine according to the embodiment of the invention includes a cooling system that is a cooling system of the engine according to the embodiment of the invention.
According to the engine provided by the embodiment of the invention, the engine cooling system fully utilizes the space effect of thermal cracking chemical reaction through the first inlet and the second inlet which are arranged at intervals along the length of the cooling channel, the thermal cracking heat absorption performance of a cooling medium can be effectively improved, and the temperature and the cracking rate of hydrocarbon fuel are lower under the condition of the same thermal load, so that the coking amount can be reduced, the cooling channel is prevented from being blocked, the heat transfer capacity of the cooling channel is improved, the performance of the engine is more stable, and the safety of an aircraft is ensured.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A cooling system for an engine, the engine including a peripheral wall having a cooling passage therein extending through the engine generally along a length of the peripheral wall, the peripheral wall having a first inlet and a second inlet, the first and second inlets communicating with the cooling passage, the cooling system comprising:
a reservoir for storing an endothermic hydrocarbon fuel;
a first connection pipe, one end of which is connected to the reservoir and the other end of which is communicated with the first inlet, so that the endothermic hydrocarbon fuel can enter the cooling passage through the first connection pipe and the first inlet;
a second connection pipe, one end of which is connected to the reservoir and the other end of which is communicated with the second inlet, so that the heat absorption type hydrocarbon material enters the cooling channel through the second connection pipe and the second inlet;
the first inlet and the second inlet are arranged at an interval in the length direction of the peripheral wall, the second inlet is located downstream of the first inlet in the flow direction of the endothermic hydrocarbon fuel in the cooling passage, the endothermic hydrocarbon fuel entering the cooling passage from the first inlet has undergone a certain degree of thermal cracking chemical reaction when flowing to a position in the cooling passage corresponding to the second inlet, and the endothermic hydrocarbon fuel entering the cooling passage from the second inlet is instantaneously heated and undergoes thermal cracking chemical reaction.
2. The cooling system of an engine according to claim 1, wherein the first inlet is provided at a first end surface of the peripheral wall, and a distance between the second inlet and the first end surface of the peripheral wall is larger than a distance between the second inlet and a second end surface of the peripheral wall.
3. The cooling system for an engine according to claim 1, wherein a temperature of the endothermic hydrocarbon material when flowing out of the cooling passage is a first preset temperature, a temperature of the endothermic hydrocarbon fuel when flowing into the cooling passage from the first inlet to a position corresponding to the second inlet in the cooling passage is a second preset temperature, the second preset temperature is less than the first preset temperature, and a difference between the first preset temperature and the second preset temperature is 10 ℃ or more and 100 ℃ or less.
4. The cooling system of the engine according to claim 3, further comprising a first control valve provided on the first nipple to control a flow rate of the endothermic hydrocarbon fuel flowing from the first inlet into the cooling passage, and a second control valve provided on the second nipple to control a flow rate of the endothermic hydrocarbon fuel flowing from the second inlet into the cooling passage.
5. The cooling system of the engine according to claim 4, further comprising a measuring device for detecting a temperature of the endothermic hydrocarbon fuel at a position corresponding to the second inlet in the cooling passage.
6. The cooling system of the engine according to claim 5, wherein at least one of the first control valve and the second control valve is adjusted to maintain the temperature of the endothermic hydrocarbon fuel at a position within the cooling passage corresponding to the second inlet at the second preset temperature.
7. The cooling system of an engine according to any one of claims 1 to 6, wherein the cooling passage is plural, the plural cooling passages are arranged at intervals in a circumferential direction of the peripheral wall, the first inlet and the second inlet are plural respectively, the plural first inlets correspond to the plural cooling passages one by one, and the plural second inlets correspond to the plural cooling passages one by one.
8. The cooling system of the engine according to any one of claims 1 to 6, wherein a third inlet is further provided on a peripheral wall of the engine, the third inlet communicating with the cooling passage, the third inlet being located downstream of and spaced from the second inlet in the flow direction.
9. The cooling system for an engine according to any one of claims 1 to 6, wherein said engine further comprises a combustion chamber surrounded by said peripheral wall, said peripheral wall being provided with at least one of a jet plate and a cavity, and said endothermic hydrocarbon fuel flowing from said cooling passage is injected into said combustion chamber through said at least one of said jet plate and said cavity.
10. An engine, characterized by comprising a cooling system of the engine according to any one of claims 1-9.
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| JP2007120316A (en) * | 2005-10-25 | 2007-05-17 | Japan Aerospace Exploration Agency | Regenerative cooling system of combined cycle engine |
| CN104989550A (en) * | 2015-07-22 | 2015-10-21 | 北京航空航天大学 | Liquid-nitrogen cooling system of scramjet engine |
| EP3591210A1 (en) * | 2017-04-10 | 2020-01-08 | Mitsubishi Heavy Industries, Ltd. | Regenerative cooler for ramjet engine, and method for manufacturing same |
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| CN105295992B (en) * | 2015-12-04 | 2017-01-11 | 天津大学 | Active cooling agent containing aircraft engine fuel and method for cooling aircraft engine by adopting active cooling agent |
| CN109630314B (en) * | 2018-12-13 | 2020-06-30 | 西安航天动力研究所 | Cold start system and cold start method for air-breathing engine |
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| JPH06249070A (en) * | 1993-02-22 | 1994-09-06 | Natl Aerospace Lab | Method and apparatus for cooling gas film in high temperature section |
| EP1022456A2 (en) * | 1999-01-21 | 2000-07-26 | Otkrytoe Aktsionernoe Obschestvo Nauchno-Proizvodstvennoe Obiedinenie "Energomash", Imeni Akademika V.P. Glushko, Russian Fed. | Coating for a liquid-propellant rocket combustion chamber |
| JP2007120316A (en) * | 2005-10-25 | 2007-05-17 | Japan Aerospace Exploration Agency | Regenerative cooling system of combined cycle engine |
| CN104989550A (en) * | 2015-07-22 | 2015-10-21 | 北京航空航天大学 | Liquid-nitrogen cooling system of scramjet engine |
| EP3591210A1 (en) * | 2017-04-10 | 2020-01-08 | Mitsubishi Heavy Industries, Ltd. | Regenerative cooler for ramjet engine, and method for manufacturing same |
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| CN111636966A (en) | 2020-09-08 |
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