CN113028454A - High-frequency detonation combustion scheme based on regenerative cooling - Google Patents

High-frequency detonation combustion scheme based on regenerative cooling Download PDF

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CN113028454A
CN113028454A CN202110381966.4A CN202110381966A CN113028454A CN 113028454 A CN113028454 A CN 113028454A CN 202110381966 A CN202110381966 A CN 202110381966A CN 113028454 A CN113028454 A CN 113028454A
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cooling
detonation
liquid water
fuel
liquid
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CN113028454B (en
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王可
于潇栋
赵明皓
朱亦圆
张玉坤
夏家兴
范玮
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Northwestern Polytechnical University
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R7/00—Intermittent or explosive combustion chambers
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
    • C23C4/126—Detonation spraying
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02K—JET-PROPULSION PLANTS
    • F02K7/00—Plants in which the working fluid is used in a jet only, i.e. the plants not having a turbine or other engine driving a compressor or a ducted fan; Control thereof
    • F02K7/02—Plants in which the working fluid is used in a jet only, i.e. the plants not having a turbine or other engine driving a compressor or a ducted fan; Control thereof the jet being intermittent, i.e. pulse-jet

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  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
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  • Fluidized-Bed Combustion And Resonant Combustion (AREA)

Abstract

The invention provides a high-frequency detonation combustion scheme based on regenerative cooling, which comprises a pulse detonation combustion chamber and a high-frequency detonation combustion control method. The method is characterized in that a proper cooling jacket structure is adopted outside the detonation tube, liquid water or liquid water liquid fuel is used as a cooling medium, when the liquid water is used as the cooling medium, the liquid water firstly flows through the cooling jacket, forced convection cooling is carried out on the detonation tube from the outer side by utilizing the characteristics of small volume, large specific heat capacity, convenience, easiness in obtaining and the like of the liquid water, the cooling medium after absorbing heat is conveyed to the head of the detonation tube through a supply pipeline and is sprayed into the detonation tube through a spraying system arranged at the head to serve as an isolation medium, the purpose of isolating a combustion product of the previous cycle from a fresh reactant of the next cycle is achieved, and the detonation combustion failure caused by early ignition of the fresh reactant is prevented; when two kinds of liquid water and liquid fuel are used as cooling media, in addition to the advantages, the liquid fuel can be preheated, atomization and evaporation are promoted, and the initiation performance is improved. The invention can not only realize the effective cooling of the detonation tube, but also ensure the high-frequency stable work of the pulse detonation combustion chamber, and can be used in the fields of ship pulse detonation engines, thermal spraying, power generation and the like.

Description

High-frequency detonation combustion scheme based on regenerative cooling
Technical Field
The invention relates to the technical field of detonation combustion, in particular to a high-frequency detonation combustion scheme based on regenerative cooling.
Background
The detonation combustion is close to the isochoric combustion, the heat release rate is high, the self-pressurization can be realized, and the method has potential important application prospects in the field of jet propulsion. When a Pulse Detonation Combustor (PDC for short) runs for a long time, the temperature of the wall surface of the Detonation tube is rapidly increased by a large amount of heat released by Detonation combustion, so that the heat resistance limit of the material is exceeded to cause structural damage, and the heat causes large performance loss to reduce the heat efficiency; in addition, the hot tube walls can cause premature ignition of the reactants, rendering detonation combustion ineffective. Therefore, it is essential to find effective cooling measures to ensure stable operation of the PDC. The valveless isolation supply mode can not only get rid of the limitation of the mechanical valve on the working frequency of the PDC, but also avoid the occurrence of continuous combustion, and is a feasible high-frequency working mode of the PDC. The traditional valveless isolation mode requires an independent isolation medium supply system, which increases the overall system weight and complexity to some extent.
Aiming at the problems, the pulse detonation combustion chamber which can effectively cool the detonation tube and ensure high-frequency stable work is designed, and the pulse detonation combustion chamber is particularly important. The invention provides a high-frequency detonation combustion scheme based on regenerative cooling, which can meet the requirements and has practical value in the fields of ship pulse detonation engines, thermal spraying, power generation and the like.
Disclosure of Invention
Technical problem to be solved
Aiming at the problems of the current PDC valveless filling mode and the wall surface heat management, the invention provides a high-frequency detonation combustion scheme based on regenerative cooling. A proper cooling jacket structure is adopted outside the detonation tube, and liquid water or liquid water liquid fuel is used as a cooling medium. When liquid water is used as a cooling medium, the liquid water firstly flows through the cooling sleeve, and forced convection cooling is carried out on the detonation tube from the outer side by utilizing the characteristics of small volume, large specific heat capacity, convenience, easiness in obtaining and the like of the liquid water; the cooling medium after absorbing heat is conveyed to the head of the detonation tube through the supply pipeline and is sprayed into the detonation tube through the injection system arranged at the head to serve as an isolation medium, so that the purpose of isolating a combustion product of the previous cycle from a fresh reactant of the next cycle is achieved, and the detonation combustion failure caused by the early ignition of the fresh reactant is prevented. When two kinds of liquid water and liquid fuel are used as cooling media, in addition to the advantages, the liquid fuel can be preheated, atomization and evaporation are promoted, and the initiation performance is improved. The efficient cooling of the detonation tube can be realized, and the high-frequency stable work of the pulse detonation combustion chamber can be ensured. The invention can be used in the fields of ship pulse detonation engines, thermal spraying, power generation and the like.
In order to achieve the purpose, the invention adopts the technical scheme that:
a high-frequency detonation combustion scheme based on regenerative cooling comprises a pulse detonation combustion chamber and a high-frequency detonation combustion control method.
The pulse detonation combustion chamber is composed of a detonation tube, a cooling system, a supply and mixing system and an ignition system.
The detonation tube is as follows: the circular tube structure is closed at one end and opened at the other end, and the direction of the closed end is defined as the upstream, and the direction of the opened end is defined as the downstream.
The cooling system consists of a liquid water supply channel, a liquid fuel supply channel, a liquid water cooling jacket, a liquid fuel cooling jacket, a cooling medium (water) supply channel, a cooling medium (fuel) supply channel, a water vapor separation device, a pressure regulating device, a flow regulator and a cooling medium discharge channel. The liquid water cooling jacket is a main device for exchanging heat of the detonation tube and the cooling water, the liquid fuel cooling jacket is a main device for exchanging heat of the detonation tube and the liquid fuel, and an annular, radial ribbed, tube bundle-shaped or brazed cooling channel can be adopted in the liquid fuel cooling jacket; the cooling jacket at least covers the downstream of the ignition device to the tail end of the detonation tube, and an inlet and an outlet can be specifically designed according to actual conditions; the axial lengths of the liquid water cooling sleeve and the liquid fuel cooling sleeve can be specifically designed according to actual conditions; when the tail nozzle is installed at the tail part of the combustion chamber, the cooling sleeve can be prolonged to the tail nozzle according to specific conditions. Liquid water enters the liquid water cooling jacket through the liquid water supply channel, liquid fuel enters the liquid fuel cooling jacket through the liquid fuel supply channel, forced convection cooling is respectively carried out on the outer wall of the detonation tube, and then the liquid fuel flows to the outlet of the cooling jacket; the water vapor enters a cooling medium (water) supply channel and is sent to the head of the detonation tube, a water vapor separation device, a pressure regulating device and a flow regulator are arranged at the outlet of the channel, the water vapor with certain pressure and flow is sprayed into the tube through a head isolation medium injector to serve as an isolation medium, the rest cooling water is discharged through a cooling medium discharge channel, and the part of cooling water can be subjected to waste heat recovery and used for heating or other purposes.
The supply and mixing system consists of a fuel supply channel, a fuel injector, an oxidant supply channel and an isolation medium injector. The isolation medium injector is positioned at the geometric center of the closed section of the detonation tube; the fuel and the oxidant respectively enter the front end of the detonation tube through the independent channels, the fuel and the oxidant are symmetrically distributed along the central axis of the detonation tube, the included angle between the fuel and the oxidant and the downstream direction of the central axis is 30-90 degrees, and the specific angle is smaller than or equal to the jetting half-cone angle of the isolation medium injector; extending the dotted lines of the fuel and oxidant supply channels close to the side wall surface of the head of the detonation tube to a junction, wherein the junction is overlapped with the position of an isolation medium nozzle; the inner diameters of the fuel and oxidant supply channels are designed according to actual conditions.
The ignition system is as follows: adopting a detonation mode that an ignition device ignites and is converted into detonation through slow combustion; the ignition device can adopt a spark plug; solid barriers or fluid barriers may be employed as the detonation enhancing means.
The high-frequency detonation combustion control method comprises the following steps: the fuel, the oxidant and the isolation medium are filled in a valveless mode, namely, the valve is in a normally open state in the pulse detonation cycle working process; the filling pressure of the isolation medium is controlled between the peak pressure of the head of the detonation tube and the pressure of the platform area, and the filling pressure of the fuel and the oxidant is controlled to be close to the pressure of the platform area and lower than the filling pressure of the isolation medium; when a detonation cycle starts, fuel and oxidant are filled into a detonation tube through a fuel supply channel, a fuel injector and an oxidant supply channel respectively; after the filling process is finished, the ignition device starts to ignite to form detonation waves; the method comprises the following steps that an isolation medium enters a detonation tube through a head isolation medium injector, the initial filling time is 0-1 ms later than the initial filling time of fuel and oxidant, the specific filling delay time is determined by the vaporization effect of the isolation medium, and when the vaporization effect is poor, the delay time can be properly shortened to enable the isolation medium to enter the detonation tube to be vaporized to form an isolation region as soon as possible; the detonation wave is transmitted to the opening end of the detonation tube, meanwhile, the detonation wave forms a section of high-pressure area at the head of the detonation tube, the pressure of the area is higher than the filling pressure of the fuel, the oxidant and the isolation medium, and a pneumatic valve is formed at the head of the detonation tube, so that the fuel, the oxidant and the isolation medium cannot enter the detonation tube, and the filling process is suspended; the continuous exhaust process of the combustion products enables the pressure at the head of the detonation tube to be reduced, when the pressure is reduced to be lower than the filling pressure of the isolation medium, the filling process of the isolation medium is recovered and enters the detonation tube first to form a section of isolation region, and the combustion products are isolated; the detonation tube head pressure continues to drop until the pressure drops below the fuel and oxidizer fill pressure, at which point the fuel and oxidizer fill process resumes and the next cycle begins.
Has the advantages that:
the invention provides a high-frequency detonation combustion scheme based on regenerative cooling.A proper cooling jacket structure is adopted outside a detonation tube, and liquid water or liquid water liquid fuel is used as a cooling medium. When liquid water is used as a cooling medium, the liquid water firstly flows through the cooling sleeve, and forced convection cooling is carried out on the detonation tube from the outer side by utilizing the characteristics of small volume, large specific heat capacity, convenience, easiness in obtaining and the like of the liquid water; the cooling medium after absorbing heat is conveyed to the head of the detonation tube through the supply pipeline and is sprayed into the detonation tube through the injection system arranged at the head to serve as an isolation medium, so that the purpose of isolating a combustion product of the previous cycle from a fresh reactant of the next cycle is achieved, and the detonation combustion failure caused by the early ignition of the fresh reactant is prevented. When two kinds of liquid water and liquid fuel are used as cooling media, in addition to the advantages, the liquid fuel can be preheated, atomization and evaporation are promoted, and the initiation performance is improved. The efficient cooling of the detonation tube can be realized, and the high-frequency stable work of the pulse detonation combustion chamber can be ensured. The invention can be used in the fields of ship pulse detonation engines, thermal spraying, power generation and the like.
Drawings
FIG. 1 is a schematic diagram of a pulse detonation combustor configuration of the present invention (example 1, gaseous fuel);
FIG. 2 is a simplified schematic of a pulse detonation combustor configuration of the present invention (example 2, liquid fuel, single layer cooling configuration);
FIG. 3 is a simplified schematic of a pulse detonation combustor configuration according to the present invention (example 3, liquid fuel, inside and outside dual layer cooling configuration);
FIG. 4 is a schematic control timing diagram for a pulse detonation combustor in accordance with the present invention;
FIG. 5 is a graph of detonation tube head pressure versus time in accordance with the present invention;
in the above drawings, 1 is a detonation tube, 2 is a liquid water cooling jacket, 3 is an ignition device, 4 is an oxidant supply passage, 5 is a fuel supply passage, 6 is an isolation medium injector, 7 is a liquid water supply passage, 8 is a cooling medium (water) supply passage, 9 is a water vapor separation device, 10 is a pressure regulating device, 11 is a flow regulator, 12 is a cooling medium discharge passage, 13 is a control system, 14 is a liquid fuel cooling jacket, 15 is a liquid fuel supply passage, 16 is a cooling medium (fuel) supply passage, and 17 is a fuel injector.
Detailed Description
The invention is further described with reference to the accompanying drawings and the specific implementation process.
Referring to fig. 1, 2 and 3, the pulse detonation combustor is composed of a detonation tube 1, a cooling system (e.g., a liquid water supply passage 7, a liquid fuel supply passage 15, a liquid water cooling jacket 2, a liquid fuel cooling jacket 14, a cooling medium (water) supply passage 8, a cooling medium (fuel) supply passage 16, a water vapor separation device 9, a pressure regulating device 10, a flow regulator 11 and a cooling medium discharge passage 12), a supply and mixing system (e.g., a fuel supply passage 5, a fuel injector 17, an oxidizer supply passage 4, a separation medium injector 6), an ignition system (e.g., an ignition device 3) and a control system 13. The detonation tube 1 is of a circular tube-shaped structure with one closed end and one open end, and the direction of the closed end is defined as the upstream, and the direction of the open end is defined as the downstream. Liquid water enters the liquid water cooling jacket 2 through the liquid water supply channel 7, vapor after heat absorption and vaporization enters the cooling medium (water) supply channel 8 and is sent to the head of the detonation tube, a vapor separation device 9, a pressure regulating device 10 and a flow regulator 11 are installed at the outlet of the channel 8, the vapor with certain pressure and flow is sprayed into the tube through the head isolation medium injector to serve as isolation medium, and the rest cooling water is discharged through the cooling medium discharge channel 12. The isolation medium injector 6 is positioned at the geometric center of the closed end of the detonation tube 1, and isolation medium enters the detonation tube 1 through a cooling system; the fuel and the oxidant respectively enter the front end of the detonation tube 1 through a fuel supply channel 5 and an oxidant supply channel 4, the fuel and the oxidant are symmetrically distributed about the central axis of the detonation tube 1, the included angle between the fuel and the oxidant and the downstream direction of the central axis is 30-90 degrees, and the specific angle is smaller than or equal to the injection half-cone angle of the isolation medium injector 6; extending the dotted lines of the fuel supply channel 5 and the oxidant supply channel 4 close to the side wall surface of the head part of the detonation tube to a junction, wherein the junction is overlapped with the position of an isolating medium nozzle; the inner diameters of the fuel supply channel 5 and the oxidant supply channel 4 should be specifically designed by the actual circumstances. The ignition system adopts an initiation mode that an ignition device 3 ignites to convert from slow combustion to detonation, the ignition device can adopt a spark plug, and a solid barrier or a fluid barrier can be adopted as an initiation enhancing device.
Referring to fig. 4 and 5, in operation, the fuel, the oxidizer and the isolation medium are filled in a valveless mode, that is, the valve is in a normally open state during the pulse detonation cycle operation; filling pressure p of the isolating mediumpurgeControlling the peak pressure of the head of the detonation tube and the pressure p of the platform areaplateauOf fuel pfuelAnd an oxidizer filling pressure poxidizerControlling the pressure p in the plateau regionplateauNear, below the filling pressure p of the isolating mediumpurge(ii) a At the beginning of the detonation cycle, fuel and oxidant are valveless filled into the detonation tube 1 via the fuel supply channel 5 and the oxidant supply channel 4, respectively; after the end of the filling process, the ignition device 3 starts to igniteForming a detonation wave; the method comprises the following steps that an isolation medium enters a detonation tube through a head isolation medium injector, the initial filling time is 0-1 ms later than the initial filling time of fuel and oxidant, the specific filling delay time is determined by the vaporization effect of the isolation medium, and when the vaporization effect is poor, the delay time can be properly shortened to enable the isolation medium to enter the detonation tube to be vaporized to form an isolation region as soon as possible; the detonation wave propagates to the open end of the detonation tube, and the detonation wave forms a section of high pressure zone at the head of the detonation tube, the pressure zone being higher than the pressure of the fuel pfuelOxidant poxidizerAnd an isolation medium fill pressure ppurgeA pneumatic valve is formed at the head of the detonation tube, so that fuel, oxidant and isolation medium cannot enter the detonation tube, and the filling process is suspended; the continued venting of the combustion products causes the detonation tube head pressure to drop, dropping to the isolation media fill pressure ppurgeWhen the detonation tube is filled with the combustion products, the isolation medium is filled with the combustion products, and the detonation tube is filled with the isolation medium; the detonation tube head pressure continues to drop until the pressure drops to fuel pfuelOxidant filling pressure poxidizerThereafter, the fuel and oxidizer filling process is resumed and the next cycle is started.
Example 1:
referring to fig. 1, in the present example, the cooling system is composed of a liquid water supply passage 7, a liquid water cooling jacket 2, a cooling medium (water) supply passage 8, a water vapor separation device 9, a pressure regulating device 10, a flow regulator 11, and a cooling medium discharge passage 12. The liquid water cooling jacket 2 is a main device for exchanging heat between the detonation tube 1 and cooling water, and an annular, radial ribbed, tube bundle-shaped or brazed cooling channel can be adopted inside the liquid water cooling jacket. The liquid water cooling jacket 2 at least covers the downstream of the ignition device 3 to the tail end of the detonation tube, an inlet is positioned at the tail end of the detonation tube, and an outlet is positioned at the downstream position of the ignition device; when the tail part of the combustion chamber is provided with the tail nozzle, the liquid water cooling jacket 2 can be extended to the tail nozzle according to specific conditions; when the detonation tube works for a long time, the liquid water cooling jacket 2 can cover the whole detonation tube 1 according to specific conditions.
Example 2:
referring to fig. 2, in the present example, the cooling system is composed of a liquid water supply passage 7, a liquid fuel supply passage 15, a liquid water cooling jacket 2, a liquid fuel cooling jacket 14, a cooling medium (water) supply passage 8, a cooling medium (fuel) supply passage 16, a water vapor separation device 9, a pressure regulating device 10, a flow regulator 11, and a cooling medium discharge passage 12. The installation position of the liquid water cooling jacket 2 is upstream of the installation position of the liquid fuel cooling jacket 14, and at least covers a transition section from slow combustion to detonation; the axial lengths of the liquid water cooling jacket 2 and the liquid fuel cooling jacket 14 can be specifically designed according to actual conditions, and when the detonation tube 1 works for a long time, the liquid water cooling jacket 2 and the liquid fuel cooling jacket 14 can cover the whole detonation tube 1 according to specific conditions. The liquid water cooling jacket 2 is a main device for exchanging heat between the detonation tube 1 and cooling water, the liquid fuel cooling jacket 14 is a main device for exchanging heat between the detonation tube 1 and liquid fuel, and an annular, radial ribbed, tube bundle-shaped or brazed cooling channel can be adopted in the liquid fuel cooling jacket; when the tail pipe is installed at the tail part of the combustion chamber, the cooling jacket 14 can be extended to the tail pipe according to specific conditions. Liquid water enters the liquid water cooling jacket 2 through the liquid water supply channel 7, liquid fuel enters the liquid fuel cooling jacket 14 through the liquid fuel supply channel 15, forced convection cooling is respectively carried out on the outer wall of the detonation tube, and then the liquid fuel flows to the outlet of the cooling jacket; the water vapor enters the insulating medium injector 6 as an insulating medium, and the heat-exchanged fuel enters the detonation tube 1 via the cooling medium (fuel) supply passage 16, the fuel supply passage 5 and the fuel injector 17.
Example 3:
referring to fig. 3, in this example, each part of the cooling system is the same as that in example 2, but the cooling jacket has an inner-outer double-layer cooling layout, specifically, the inner layer is provided with a liquid water cooling jacket 2, the outer layer is provided with a liquid fuel cooling jacket 14, or the inner layer is provided with the liquid fuel cooling jacket 14 according to actual conditions, and the outer layer is provided with the liquid water cooling jacket 2; in the long-term operation, the liquid water cooling jacket 2 and the liquid fuel cooling jacket 14 can cover the entire detonation tube 1 as the case may be.
While the present invention has been described in detail and with reference to the drawings and the detailed description thereof, it is not intended to limit the invention to the embodiment, but it is possible for those skilled in the art to make various changes and modifications without departing from the spirit of the invention.

Claims (7)

1. The high-frequency detonation combustion scheme based on regenerative cooling is characterized in that: the method is characterized in that a proper cooling jacket structure is adopted outside the detonation tube, liquid water or liquid water liquid fuel is used as a cooling medium, when the liquid water is used as the cooling medium, the liquid water firstly flows through the cooling jacket, forced convection cooling is carried out on the detonation tube from the outer side by utilizing the characteristics of small volume, large specific heat capacity, convenience, easiness in obtaining and the like of the liquid water, the cooling medium after absorbing heat is conveyed to the head of the detonation tube through a supply pipeline and is sprayed into the detonation tube through a spraying system arranged at the head to serve as an isolation medium, the purpose of isolating a combustion product of the previous cycle from a fresh reactant of the next cycle is achieved, and the detonation combustion failure caused by early ignition of the fresh reactant is prevented; when two liquid fuels are used as cooling media, the liquid fuels can be preheated to promote atomization and evaporation and improve the initiation performance in addition to the advantages; the efficient cooling of the detonation tube can be realized, and the high-frequency stable work of the pulse detonation combustion chamber can be ensured.
2. The regenerative cooling based high frequency detonation combustion scheme of claim 1 wherein: when liquid water is used as a cooling medium, the cooling system consists of a liquid water supply channel, a liquid water cooling jacket, a cooling medium (water) supply channel, a water vapor separation device, a pressure regulating device, a flow regulator and a cooling medium discharge channel; the cooling jacket can adopt annular, radial ribbed, tube bundle or brazed cooling channels; the cooling jacket covers the ignition device downstream to the detonation tube end, the inlet is located at the detonation tube end, the outlet is located at the ignition device downstream, when the tail nozzle is installed at the tail part of the combustion chamber, the cooling jacket is extended to the tail nozzle, and when the combustion chamber works for a long time, the cooling jacket covers the whole detonation tube.
3. The regenerative cooling based high frequency detonation combustion scheme of claim 2 wherein: liquid water enters the liquid water cooling sleeve through the liquid water supply channel, vapor after heat absorption and vaporization enters the cooling medium (water) supply channel and is sent to the head of the detonation tube, the outlet of the channel is provided with the vapor separation device, the pressure regulating device and the flow regulator, the vapor with certain pressure and flow is sprayed into the tube through the head isolation medium injector to serve as isolation medium, the rest cooling water is discharged through the cooling medium discharge channel, and the part of cooling water can be subjected to waste heat recovery and used for heating.
4. The regenerative cooling based high frequency detonation combustion scheme of claim 1 wherein: when two kinds of liquid water and liquid fuel are used as cooling media, the cooling system consists of a liquid water supply channel, a liquid fuel supply channel, a liquid water cooling jacket, a liquid fuel cooling jacket, a cooling medium (water) supply channel, a cooling medium (fuel) supply channel, a water vapor separation device, a pressure regulating device, a flow regulator and a cooling medium discharge channel; when a single-layer cooling layout is adopted, the installation position of the liquid water cooling jacket is arranged at the upstream of the installation position of the liquid fuel cooling jacket, and a transition section from slow combustion to detonation is required to be covered; when a double-layer cooling layout is adopted, the liquid water cooling jacket is arranged on the inner layer, the liquid fuel cooling jacket is arranged on the outer layer, the liquid fuel cooling jacket can also be arranged on the inner layer, and the liquid water cooling jacket is arranged on the outer layer; the axial length of the liquid water cooling jacket and the axial length of the liquid fuel cooling jacket can be specifically designed according to actual conditions, when the tail nozzle is installed at the tail part of the combustion chamber, the cooling jacket is prolonged to the tail nozzle, and the cooling jacket covers the whole detonation tube during long-time operation.
5. The regenerative cooling based high frequency detonation combustion scheme of claim 4 wherein: liquid water enters the liquid water cooling jacket through the liquid water supply channel, liquid fuel enters the liquid fuel cooling jacket through the liquid fuel supply channel, forced convection cooling is respectively carried out on the outer wall of the detonation tube, and then the liquid fuel flows to the outlet of the cooling jacket.
6. The regenerative cooling based high frequency detonation combustion scheme of claim 1 wherein: the isolation medium injector is positioned at the geometric center of the closed section of the detonation tube; the fuel and the oxidant respectively enter the front end of the detonation tube through the independent channels, and the fuel and the oxidant are symmetrically distributed about the central axis of the detonation tube, and form an included angle of 30-90 degrees with the downstream direction of the central axis and smaller than or equal to the jetting half-cone angle of the isolation medium injector; and the dotted lines of the fuel and oxidant supply channels close to the side wall surface of the head part of the detonation tube are extended to the junction, and the junction is coincided with the position of the isolating medium nozzle.
7. The regenerative cooling based high frequency detonation combustion scheme of claim 1 wherein: the high-frequency detonation combustion control method is characterized in that a fuel, an oxidant and an isolation medium all adopt a valveless filling mode, namely, in a pulse detonation cycle, a valve is in a normally open state; the filling pressure of the isolation medium is controlled between the peak pressure of the head of the detonation tube and the pressure of the platform area, and the filling pressure of the fuel and the oxidant is controlled to be close to the pressure of the platform area and lower than the filling pressure of the isolation medium; at the beginning of a detonation cycle, filling fuel and oxidant into a detonation tube through a fuel supply channel and an oxidant supply channel without a valve respectively; after the filling process is finished, the ignition device starts to ignite to form detonation waves; the isolation medium enters the detonation tube through the head isolation medium injector, the initial filling time is 0-1 ms later than the initial filling time of the fuel and the oxidant, and the vaporization effect of the isolation medium determines that the poorer the vaporization effect, the shorter the filling delay time of the isolation medium is, so that the isolation medium enters the detonation tube as soon as possible to be vaporized to form an isolation region.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115164235A (en) * 2022-07-25 2022-10-11 西北工业大学 Rotary detonation combustion chamber utilizing radial expansion of detonation waves
CN115218224A (en) * 2022-07-29 2022-10-21 西安热工研究院有限公司 Cooling structure suitable for pulse detonation combustion chamber

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