CN116066257A - Mixed fuel supply device for liquid hydrocarbon fuel cracking gas carrying flow solid fuel - Google Patents
Mixed fuel supply device for liquid hydrocarbon fuel cracking gas carrying flow solid fuel Download PDFInfo
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- CN116066257A CN116066257A CN202310094666.7A CN202310094666A CN116066257A CN 116066257 A CN116066257 A CN 116066257A CN 202310094666 A CN202310094666 A CN 202310094666A CN 116066257 A CN116066257 A CN 116066257A
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- fuel
- storage chamber
- solid fuel
- supply device
- pyrolysis gas
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- 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
- F02K7/10—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 characterised by having ram-action compression, i.e. aero-thermo-dynamic-ducts or ram-jet engines
- F02K7/14—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 characterised by having ram-action compression, i.e. aero-thermo-dynamic-ducts or ram-jet engines with external combustion, e.g. scram-jet engines
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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
- F02C7/22—Fuel supply systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention relates to the technical field of ramjet engines, in particular to a mixed fuel supply device for carrying solid fuel with liquid hydrocarbon fuel pyrolysis gas, which comprises a fuel storage chamber, wherein a piston for pushing the solid fuel is slidably arranged in the fuel storage chamber, the fuel storage chamber is communicated with a gas collecting bin, the device is provided with the gas collecting bin, macromolecule hydrocarbon fuel pyrolysis gas enters a circumferential gas collecting chamber through three gas inlets, a flow guide circular table is arranged in the circumferential gas collecting chamber, the pyrolysis gas shears and flows the solid fuel in a radial centripetal manner through a slit between the flow guide circular table and an air outlet baffle, the carrying and mixing of the solid fuel are effectively realized through the shearing flow, the device is provided with an air inlet slit of the pyrolysis gas, the slit is composed of a flow guide table and the baffle, the slit distance is small, and even a small amount of pyrolysis gas still has a large speed to shear and carry the solid fuel through the slit.
Description
Technical Field
The invention relates to the technical field of ramjet engines, in particular to a mixed fuel supply device for a liquid hydrocarbon fuel pyrolysis gas carrying flow solid fuel.
Background
The solid-liquid mixed high Mach-number engine is a new concept engine, which adopts solid powder and liquid fuel as propellant. The working process principle is as follows: the liquid fuel cools the supersonic combustion chamber through the regenerative cooling channel to generate high-temperature and high-density fuel pyrolysis gas or steam, and the pyrolysis gas fluidizes, blends and sprays the solid powder fuel in a pneumatic conveying mode and enters the combustion chamber to burn, so that thrust is generated by using a jet propulsion principle.
The solid-liquid mixed high Mach ramjet engine with the new concept adopts high-energy metal or boron powder as a solid propellant, and has the advantages of adjustable thrust, flexible flow adjustment, high specific impulse, safe and reliable solid rocket ramjet engine, simple structure and the like. For a ramjet engine using powder fuel, the solid powder has no flow property, so that the flow controllability is poor, the heat protection of a combustion chamber depends on the passive heat protection of a high-temperature resistant material, meanwhile, the solid powder is not easy to ignite and burn in the combustion chamber, and the metal powder particles are used as fuel. The pyrolysis gas generated by using the liquid fuel through the regeneration cooling channel carries the solid powder particles, so that the solid powder particles obtain flow properties, and the flow controllability is greatly enhanced. The ignition combustion of the pyrolysis gas can be used as an ignition source of solid particles, so that the ignition combustion characteristic of the combustion chamber is improved. The endothermic nature of the fuel during pyrolysis can contribute to the thermal protection of the combustion chamber.
In the long-time running process of the engine, the mixed fuel needs to be continuously consumed, and the mixed fuel is mixed uniformly in a gas-solid two-phase region, and then is further mixed with the incoming air in a combustion chamber to be ignited and burnt.
Disclosure of Invention
The invention aims to provide a mixed fuel supply device of a solid-liquid mixed scramjet engine. The micron-level high-energy solid fuel is pushed by a piston, and under the shearing and flow carrying action of macromolecule hydrocarbon fuel pyrolysis gas, the flow property is obtained, and the flow property is adapted to the multi-working condition of the engine, so that the function of uniformly mixing the mixed fuel, the gas and the solid of the solid-liquid mixed scramjet engine is realized.
The invention adopts the technical scheme that: the device comprises a plunger pump for pushing macromolecular liquid hydrocarbon fuel, a regeneration cooling channel for cracking the macromolecular liquid hydrocarbon fuel, and a fuel supply device for carrying and mixing solid fuel;
the fuel supply device comprises a fuel storage chamber, a piston for pushing solid fuel is slidably arranged in the fuel storage chamber, and the fuel storage chamber is communicated with a gas collecting bin.
Further, the fuel reservoir is divided into three parts, a reservoir straight section, a reservoir converging section and a thin straight section.
Further, baffles are arranged at two ends of the gas collection bin, a front baffle and a rear baffle are respectively arranged, an air inlet is arranged at the eccentric position of the front baffle, a diversion table is arranged at one end of the thin straight section of the storage chamber, which is far away from the contraction section of the storage chamber, and a slit is formed between the diversion table and the rear baffle.
Further, the air inlet holes are provided with three.
Further, a piston rod is arranged on the piston and is arranged at the output end of the motor.
Further, one end of the straight section of the storage chamber far away from the contraction end of the storage chamber is provided with a round table, one end of the straight section of the storage chamber far away from the contraction end of the storage chamber is provided with a baffle, and a piston rod is slidably arranged on the baffle.
Further, a sliding bearing is arranged between the baffle and the piston rod.
Further, the rear baffle plate is connected with the front baffle plate through bolts.
Further, a mixing tube is mounted on the tailgate.
Further, a flow regulating valve is arranged at the output position of the plunger pump.
The beneficial effects of the invention are as follows:
the device is provided with the gas collecting bin, macromolecule hydrocarbon fuel pyrolysis gas enters the circumferential gas collecting chamber through the three gas inlets, the flow guide circular table is arranged in the circumferential gas collecting chamber, the pyrolysis gas shears and flows the solid fuel in a radial centripetal way through the slit between the flow guide circular table and the gas outlet baffle, the solid fuel is effectively carried and mixed through the shearing flow, the device is provided with the gas inlet slit of the pyrolysis gas, the slit consists of the flow guide table and the baffle, the slit distance is small, even a small amount of pyrolysis gas still has a larger speed through the slit to shear and carry the solid fuel, and the solid fuel flow can be controlled by controlling the rotating speed of the motor; the control of the cracking gas flow can be controlled through a pipeline valve before splitting the cracking gas; the single-phase flow of the mixed fuel is respectively adjusted, the solid-gas ratio of the mixed fuel is wide in adjustable range, and the mixed fuel is matched with the operating condition of the engine type working condition.
Drawings
FIG. 1 is a schematic diagram of a mixed fuel supply device for a liquid hydrocarbon fuel pyrolysis gas carrying stream solid fuel according to the present invention;
FIG. 2 is a schematic view of a fuel supply according to the present invention;
FIG. 3 is a schematic cross-sectional view of a fuel supply apparatus according to the present invention;
in the figure: an oil storage tank 1; a plunger pump 2; a flow rate regulating valve 3; a regenerative cooling channel 4; a fuel supply device 5; a piston rod 51; a seal ring 52; a baffle 53; a piston 54; a fuel reservoir 55; a gas collection bin 56; a baffle 53; an air intake hole 57; a baffle 53; a diversion table 58; a blending tube 59; and a motor 6.
The specific embodiment is as follows:
example 1
Aiming at flight tasks with flight Mach numbers of 8-10, a high Mach number scramjet engine using liquid fuel pyrolysis gas carrying solid powder particles as fuel is provided, and the high Mach number scramjet engine is called a solid-liquid mixing scramjet engine. The fuel supply device of the engine is required to realize that liquid hydrocarbon fuel fluidizes and blends solid powder particles with each other and brings the solid powder particles into a fuel chamber for combustion. In the actual running of the engine, the liquid hydrocarbon fuel firstly flows through a regeneration cooling channel on the wall surface of the combustion chamber of the engine, under the high-temperature and high-pressure environment of the regeneration cooling channel, the liquid hydrocarbon fuel is cracked to be called as micromolecular fuel cracking gas, the cracking gas at the outlet of the cooling channel enters from an air inlet hole of a gas collecting bin 56, flows out from a slit of the gas collecting bin 56, shears and carries the solid fuel pushed by a piston 54, is mixed in a mixing pipe 59, and then enters into the combustion chamber of the engine for combustion.
The invention relates to a mixed fuel supply device for a liquid hydrocarbon fuel pyrolysis gas carrying flow solid fuel, which comprises a plunger pump 2 for pushing macromolecular liquid hydrocarbon fuel, wherein the plunger pump 3 pushes the macromolecular liquid hydrocarbon fuel in an oil storage tank 1 to a regeneration cooling channel 4 of a scramjet engine, the macromolecular liquid hydrocarbon fuel absorbs heat and is cracked into micromolecular pyrolysis gas, the pyrolysis gas at the outlet of the regeneration cooling channel 4 enters a fuel supply device 5, and the fuel supply device 5 realizes the function of carrying flow mixing of the solid fuel.
The fuel supply device 5 comprises a fuel storage chamber 55, solid fuel is positioned in the fuel storage chamber 55, a piston 54 for pushing the solid fuel is slidably mounted in the fuel storage chamber 55, the fuel storage chamber 55 is communicated with a gas collecting bin 56, the solid fuel is pushed into the gas collecting bin 56 through the piston 54, the fuel storage chamber 55 and the gas collecting bin 56 are coaxially arranged, a slit is formed in the gas collecting bin 56, and liquid hydrocarbon fuel pyrolysis gas enters the gas collecting bin 56 after being generated by the engine regeneration cooling channel 4 and flows out from a circumferential slit at an outlet of the gas collecting bin 56, so that the functions of shearing, carrying and blending the solid fuel are realized.
Macromolecular liquid hydrocarbon fuel: aviation kerosene RP-3 is widely used as fuel for aircraft engines, and has an average carbon content per unit molecule of about 10, and researchers generally use n-decane as a substitute. In chemical kinetics research, molecules with smaller carbon content are called small molecular hydrocarbon fuels, such as C1-C4, which are in the fuel gas state, and large molecular hydrocarbon fuels with higher carbon content, such as C10 and C11. The macromolecular hydrocarbon fuel is widely found in various documents, such as the left-turn frame of Harbin industrial university, the ultrasonic gas film is organized by using high-temperature gaseous macromolecular hydrocarbon fuel in the research of cooling and drag reduction characteristics of the hydrocarbon fuel gas film of a scramjet engine, and Chi Yicheng of hong Kong university in the research of high-precision theoretical thermochemical research of hydrogen-abstraction reaction of macromolecular branched paraffins CnH2n+2+ (H, OH, HO 2) is important for developing the high-precision chemical reaction mechanism of macromolecular hydrocarbon fuel and for developing the chemical reaction mechanism of aviation kerosene.
Endothermic cracking conditions and completion of working section: in the actual running of the scramjet engine, the core temperature of the combustion chamber can reach 2500K and far exceeds the melting point of engine materials, so that the wall surface of the combustion chamber of the engine needs to be cooled in the actual running process, the engine is prevented from being burnt, and the regenerative cooling is a widely used cooling mode. By casting the regeneration cooling channel 4 on the wall surface of the combustion chamber of the engine, the liquid fuel passes through the regeneration cooling channel 4 before entering the combustion chamber for combustion, and the wall surface is cooled by utilizing the physical heat sink and the chemical heat sink of the fuel. Because the inside of the combustion chamber is high-pressure, the outlet of the regeneration cooling channel 4 is communicated with the combustion chamber, the inside of the regeneration cooling channel is also high-pressure environment, meanwhile, the wall surface of the cooling channel is the wall surface of the combustion chamber of the engine, the temperature in the channel is very high, and when the macromolecular liquid hydrocarbon fuel passes through the regeneration cooling channel of the engine under the high-temperature and high-pressure environment, the macromolecular liquid hydrocarbon fuel can be cracked into micromolecular hydrocarbon fuel.
Therefore, the condition of cracking and heat absorption is that the high-temperature and high-pressure environment in the engine regeneration cooling channel 4 is completed in the regeneration cooling channel 4 on the wall surface of the combustion chamber, and the cooling on the wall surface of the combustion chamber of the engine is realized by utilizing the physical heat sink of macromolecular liquid hydrocarbon fuel and the chemical heat sink for cracking and heat absorption. The cracking reaction needs to be carried out under high temperature and high pressure conditions, and the regenerative cooling channel of the wall surface of the combustion chamber has the condition.
Example 2
In this embodiment, the fuel storage chamber 55 is divided into three parts, i.e., a straight storage chamber section, a shrinkage storage chamber section and a thin straight storage chamber section, the shrinkage storage chamber section is conical, the solid fuel is pushed by the piston 54, and the solid fuel sequentially passes through the shrinkage storage chamber section and the thin straight storage chamber section from the straight storage chamber section to enter the gas collection chamber 56, and the inner diameter of the fuel storage chamber 55 is gradually reduced during the pushing process of the solid fuel, so that the flow rate of the solid fuel is controlled, and the position of the solid fuel entering the gas collection chamber 56 is located at the center position of the gas collection chamber 56.
Example 3
Based on embodiment 2, in this embodiment, the gas collecting bin 56 is in a ring-shaped structure, two ends of the gas collecting bin 56 are respectively provided with a baffle 53, the baffle 53 is respectively in a shape of a front baffle and a rear baffle, the front baffle is sleeved on the outer wall of the contraction section of the gas collecting bin, a casting mode is selected for the installation mode (the known technical means such as crimping and welding can also be adopted), a sealing ring 52 is installed between the rear baffle and the gas collecting bin 56, the sealing function of the gas collecting bin 56 is realized through the two baffles 53, an air inlet 57 is arranged at the eccentric position of the front baffle, one end of the thin straight section of the gas collecting bin, which is far away from the contraction section of the gas collecting bin, is provided with a flow guiding table 58, the flow guiding table 58 is coaxially arranged on the outer wall of the contraction section of the gas collecting bin, a slit is formed between the flow guiding table 58 and the rear baffle, the flow guiding table 58 is in a ring-shaped structure, a buffer round corner is poured on an edge, and liquid hydrocarbon fuel cracking gas entering from the flow guiding table 58 is guided to the flow guiding table 58 through the flow guiding table 58, so that the liquid fuel cracking gas flows around the flow guiding table 58, thereby controlling the liquid fuel cracking gas to flow to the flow, and realizing the functions of mixing and carrying the solid fuel gas and the solid fuel.
Example 4
Based on embodiment 2, in this embodiment, three air inlets 57 are provided, and the three air inlets 57 are uniformly arranged along the circumferential direction of the front baffle, so as to increase the uniformity of gas phase distribution in the gas collecting bin 56, ensure the stability of the radial flow state of the gas at the slit, and realize the function of shearing and carrying flow for the solid fuel.
Example 5
Based on embodiment 1, in this embodiment, the piston 54 is provided with a piston rod 51, the piston rod 51 is mounted at the output end of the motor 6 and is driven by the motor 6, the flow of the solid fuel can be controlled by controlling the rotation speed of the motor 6, an annular groove is formed on the outer wall of the piston 54, a sealing ring is mounted between the annular groove and the inner wall of the straight section of the storage chamber, the sealing function is realized, and the solid fuel is prevented from seeping out from between the inner wall of the straight section of the storage chamber and the piston 54.
Example 6
Based on embodiment 2, in this embodiment, one end of the straight section of the storage chamber far from the shrinkage end of the storage chamber is provided with a circular truncated cone, the circular truncated cone is annular lamellar, one end of the straight section of the storage chamber far from the circular truncated cone is provided with a baffle plate, the baffle plate is circular lamellar, the baffle plate is connected with the circular truncated cone through a bolt, a hole is formed in the center position of the baffle plate and is cast with an annular boss, a piston rod 51 is installed in the annular boss, and the piston rod 51 can freely slide in the annular boss.
Example 7
On the basis of embodiment 6, in this embodiment, a sliding bearing is installed between the annular boss and the piston rod 51, and a ball is disposed in the sliding bearing, so that friction between the piston rod 51 and the sliding bearing is reduced.
Example 8
On the basis of embodiment 3, in this embodiment, a plurality of threaded holes are provided at eccentric positions of the rear baffle and the front baffle, and the front baffle of the rear baffle is connected by bolts, so as to fix the position of the rear baffle.
Example 9
On the basis of embodiment 3, the blending pipe 59 is installed on the tailgate in this embodiment, and the blending pipe 59 can be used to achieve uniform mixing of the gas and solid phases entering the combustion chamber.
Example 10
Based on embodiment 1, in this embodiment, the output position of the plunger pump 2 is provided with a flow regulating valve 3, and the flow of the macromolecular liquid hydrocarbon fuel can be controlled by using the flow regulating valve 3, so as to realize the adjustment of the flow of the macromolecular liquid hydrocarbon fuel, thereby realizing the gas-solid two-phase mixing solid-gas ratio.
Of course, the above description is not intended to limit the invention, but rather the invention is not limited to the above examples, and variations, modifications, additions or substitutions within the spirit and scope of the invention will be within the scope of the invention.
Claims (10)
1. The mixed fuel supply device of the cracking gas carrying flow solid fuel is characterized in that: the device comprises a plunger pump for pushing macromolecular liquid hydrocarbon fuel, a regeneration cooling channel for cracking the macromolecular liquid hydrocarbon fuel, and a fuel supply device for carrying and mixing solid fuel;
the fuel supply device comprises a fuel storage chamber, a piston for pushing solid fuel is slidably arranged in the fuel storage chamber, and the fuel storage chamber is communicated with a gas collecting bin.
2. The pyrolysis gas entrained flow solid fuel mixed fuel supply device according to claim 1, characterized in that: the fuel reservoir is divided into three parts, namely a reservoir straight section, a reservoir contracted section and a thin straight section.
3. The pyrolysis gas stream-carrying solid fuel mixed fuel supply device according to claim 2, characterized in that: the two ends of the gas collection bin are respectively provided with a front baffle and a rear baffle, an air inlet is arranged at the eccentric position of the front baffle, a flow guide table is arranged at one end of the thin straight section of the storage chamber, which is far away from the contraction section of the storage chamber, and a slit is formed between the flow guide table and the rear baffle.
4. The pyrolysis gas stream-carrying solid fuel mixed fuel supply device according to claim 2, characterized in that: the air inlet holes are three.
5. The pyrolysis gas entrained flow solid fuel mixed fuel supply device according to claim 1, characterized in that: the piston is provided with a piston rod, and the piston rod is arranged at the output end of the motor.
6. The pyrolysis gas stream-carrying solid fuel mixed fuel supply device according to claim 2, characterized in that: the end of the straight section of the storage chamber, which is far away from the contraction end of the storage chamber, is provided with a round table, the end of the straight section of the storage chamber, which is far away from the straight section of the storage chamber, is provided with a baffle, and a piston rod is slidably arranged on the baffle.
7. The pyrolysis gas stream-carrying solid fuel mixed fuel supply apparatus according to claim 6, wherein: and a sliding bearing is arranged between the baffle and the piston rod.
8. The mixed fuel supply apparatus for a pyrolysis gas entrained flow solid fuel according to claim 3, wherein: the rear baffle is connected with the front baffle through bolts.
9. The mixed fuel supply apparatus for a pyrolysis gas entrained flow solid fuel according to claim 3, wherein: the rear baffle is provided with a mixing pipe.
10. The pyrolysis gas stream-carrying solid fuel mixed fuel supply device according to claim 2, characterized in that: and a flow regulating valve is arranged at the output position of the plunger pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310094666.7A CN116066257A (en) | 2023-02-10 | 2023-02-10 | Mixed fuel supply device for liquid hydrocarbon fuel cracking gas carrying flow solid fuel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310094666.7A CN116066257A (en) | 2023-02-10 | 2023-02-10 | Mixed fuel supply device for liquid hydrocarbon fuel cracking gas carrying flow solid fuel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116066257A true CN116066257A (en) | 2023-05-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310094666.7A Pending CN116066257A (en) | 2023-02-10 | 2023-02-10 | Mixed fuel supply device for liquid hydrocarbon fuel cracking gas carrying flow solid fuel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116066257A (en) |
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2023
- 2023-02-10 CN CN202310094666.7A patent/CN116066257A/en active Pending
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