Device for improving jet cooling effect of TBCC combined engine

Abstract

A device for improving the jet cooling effect of a TBCC combined engine provides a jet cooling technical route of an engine air inlet channel in which a cooling medium is mixed with carbon powder, the device comprises a carbon powder supply mechanism and a mixed jet mechanism, and the carbon powder enters the mixed jet mechanism from the carbon powder supply mechanism and is mixed with the cooling medium to form carbon-containing liquid drop particles to realize jet. The method comprises the following steps: before the carbon powder is mixed with a cooling medium, pretreating the carbon powder with a surfactant to improve the wettability of the surface of carbon powder particles, then mixing the carbon powder with the cooling medium, and wrapping the carbon powder with the cooling medium to form carbon-containing liquid drop particles with larger particle sizes. Then the carbon-containing liquid drop particles are injected into a high-temperature air inlet channel of the engine at a high speed, the outer-layer cooling medium in the carbon-containing liquid drop particles is used for achieving the effect of enhancing heat exchange through phase change, and the remaining carbon powder particles in the carbon-containing liquid drop particles can enter a combustion chamber of the engine to serve as fuel for auxiliary combustion; and finally, the jet cooling effect of the TBCC combined engine is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of jet cooling of an engine intake duct, in particular to a device for improving the jet cooling effect of a TBCC combined engine. Background Art

[0002] At present, aircraft equipped with turbine engines can generally achieve a flight Mach number of 0 to 2, and aircraft equipped with ramjet engines can generally achieve a flight Mach number of 3 to 6. As a result, aircraft equipped with any single type of engine cannot meet the power requirements from low speed to hypersonic speed.

[0003] To this end, the TBCC (Turbine Based Combined Cycle) engine came into being. It is a new type of engine that combines the two technologies of turbine engine and ramjet engine. It further integrates the advantages of turbine engine and ramjet engine within their respective applicable flight Mach number ranges.

[0004] However, the existing TBCC combination engine still has the problem of modal conversion, and there is still an urgent need to achieve the continuity of modal conversion. At this stage, the problem is mainly solved through engine inlet jet cooling technology.

[0005] However, the existing engine intake duct jet cooling technology also has certain problems during application. When spraying cooling medium into the high-temperature intake duct of the engine, when the cooling medium jet flow is small, the cooling effect will not meet the expectations; when the cooling medium jet flow is large, an excessive amount of non-phase-changed cooling medium will remain, which will negatively affect the combustion process in the engine combustion chamber.

[0006] Furthermore, conventional coolant injection systems primarily minimize the size of coolant spray droplets by improving the structure of the jet nozzle, or by adding a combustion aid to the combustion chamber after coolant injection to improve combustion. However, these approaches significantly increase the complexity of engine structural design and impose stricter weight requirements on the engine itself, resulting in significant deficiencies in conventional coolant injection technology in terms of utilizing the evaporation potential of coolant droplets. Therefore, it is imperative to find a new method that can both achieve sufficient heat transfer from the coolant and assist combustion in the combustion chamber. Utility Model Content

[0007] In response to the problems existing in the prior art, the utility model provides a device for improving the jet cooling effect of a TBCC combination engine, and proposes a technical route for jet cooling of an engine intake duct in which a cooling medium is mixed with carbon powder. Before being mixed with the cooling medium, the carbon powder is first pretreated with a surfactant to improve the wettability of the surface of the carbon powder particles. The carbon powder is then mixed with the cooling medium, and the cooling medium can wrap the carbon powder to form carbon-containing liquid droplets with larger particle size. The carbon-containing liquid droplets are then sprayed into the high-temperature intake duct of the engine at high speed. The outer layer of the cooling medium in the carbon-containing liquid droplets undergoes phase change to achieve the effect of enhanced heat exchange, and the remaining carbon powder particles in the carbon-containing liquid droplets enter the engine combustion chamber as fuel for auxiliary combustion, ultimately achieving an improvement in the jet cooling effect of the TBCC combination engine.

[0008] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions: a device for improving the jet cooling effect of a TBCC combination engine, comprising a carbon powder supply mechanism and a mixed jet mechanism; the carbon powder supply mechanism comprises a carbon powder spiral input tube and a carbon powder output cylinder, the carbon powder spiral input tube is arranged at the carbon powder output cylinder; a conical compressed air jet port is provided at one end of the carbon powder output cylinder, and a Laval-shaped carbon powder outlet is provided at the other end of the carbon powder output cylinder; the mixed jet mechanism comprises a cooling medium flow channel, a conical cooling medium jet tube, a carbon powder particle surface treatment annular cavity, an active agent buffer annular cavity, a conical carbon powder jet tube, a carbon-containing liquid droplet particle forming tube and a flared carbon-containing liquid droplet particle injection tube; the Laval-shaped carbon powder outlet The opening is connected to the carbon powder particle surface treatment ring cavity; the conical cooling medium jet tube is arranged at the outlet end of the cooling medium flow channel; the carbon powder particle surface treatment ring cavity is arranged outside the cooling medium flow channel in the circumferential direction, the conical carbon powder jet tube is arranged at the outlet end of the carbon powder particle surface treatment ring cavity, and the conical cooling medium jet tube is located on the inner side of the conical carbon powder jet tube; the active agent buffer ring cavity is arranged outside the carbon powder particle surface treatment ring cavity in the circumferential direction, and an active agent nozzle is arranged between the active agent buffer ring cavity and the carbon powder particle surface treatment ring cavity; the carbon-containing droplet particle forming tube is arranged at the outlet end of the conical carbon powder jet tube; the flared carbon-containing droplet particle injection tube is arranged at the outlet end of the carbon-containing droplet particle forming tube.

[0009] A rotary carbon powder injection port is provided at the inlet end of the carbon powder particle surface treatment ring cavity. The number of the rotary carbon powder injection port is one or more, and when the number of the rotary carbon powder injection port is multiple, the multiple rotary carbon powder injection ports are evenly distributed along the circumferential direction.

[0010] A swirl guide blade is provided at the outlet end of the carbon powder particle surface treatment annular cavity. The number of the swirl guide blades is several and the swirl guide blades are evenly distributed along the circumferential direction.

[0011] A cooling medium swirl guide groove is provided on the inner surface of the outlet end of the cooling medium flow channel, and the rotation direction of the cooling medium swirl guide groove is opposite to the rotation direction of the swirl guide blade.

[0012] A carbon powder particle screen is provided inside the carbon powder particle surface treatment ring cavity and adjacent to the rotary carbon powder injection port. The mesh number of the carbon powder particle screen is determined according to the actual used particle size of the carbon powder particles.

[0013] An active agent input port is provided at the inlet end of the active agent buffer ring cavity, and an active agent impurity removal filter is provided inside the active agent buffer ring cavity adjacent to the active agent input port.

[0014] There are a number of active agent nozzles, which are arranged in two rows along the axial direction. The active agent nozzles in each row are evenly distributed along the circumferential direction, and the active agent nozzles in each row are staggered with each other.

[0015] The particle size of the carbon powder particles inputted by the carbon powder spiral input tube ranges from 2 μm to 100 μm.

[0016] The particle size of the carbon-containing liquid droplets formed in the carbon-containing liquid droplet particle forming tube ranges from 3 μm to 1000 μm, and the jet mass ratio of the carbon powder particles used to form the carbon-containing liquid droplets to the cooling medium is from 1% to 99%.

[0017] A method for improving the jet cooling effect of a TBCC combination engine, using the device for improving the jet cooling effect of a TBCC combination engine, specifically comprising:

[0018] First, carbon powder is introduced from the carbon powder spiral inlet pipe, compressed air is introduced from the conical compressed air jet port, cooling medium is introduced from the cooling medium flow channel, and activator is introduced from the activator inlet; when the carbon powder enters the carbon powder output cylinder through the carbon powder spiral inlet pipe, it will be mixed with the compressed air introduced from the conical compressed air jet port to be broken up and obtain an initial velocity, and then the carbon powder will be accelerated through the Laval-shaped carbon powder outlet and enter the carbon powder particle surface treatment ring cavity through the rotary carbon powder injection port, at this time, the carbon powder will swirl in the carbon powder particle surface treatment ring cavity; at the same time, after the activator enters the activator buffer ring cavity from the activator inlet, it will further enter the carbon powder particle surface treatment ring cavity through the activator nozzle, and the carbon powder particles will be captured by the activator to achieve pretreatment of the carbon powder particle surface; then the carbon powder particles that have completed the surface pretreatment will swirl, When the carbon powder particles pass through the swirl guide vanes, the swirl of the carbon powder particles will be further enhanced, and then the carbon powder particles enter the conical carbon powder jet tube; at the same time, when the cooling medium passes through the cooling medium swirl guide groove, the cooling medium will form a swirl, and then the cooling medium in the swirl state will pass through the conical cooling medium jet tube into the conical carbon powder jet tube to mix with the carbon powder particles in the opposite direction of the swirl, and further mix in the carbon-containing droplet particle formation tube to form carbon-containing droplet particles, and the carbon-containing droplet particles will be sprayed into the high-temperature intake duct of the engine through the flared carbon-containing droplet particle injection tube, the outer layer of the cooling medium in the carbon-containing droplet particles is cooled by heat exchange through phase change, and the remaining carbon powder particles in the carbon-containing droplet particles then enter the combustion chamber of the engine as fuel for auxiliary combustion, ultimately completing the improvement of the jet cooling effect of the TBCC combination engine.

[0019] Beneficial effects of the utility model:

[0020] The utility model discloses a device for improving the jet cooling effect of a TBCC combination engine, and proposes a technical route for jet cooling of an engine intake duct in which a cooling medium is mixed with carbon powder. Before being mixed with the cooling medium, the carbon powder is first pretreated with a surfactant to improve the wettability of the surface of the carbon powder particles. The carbon powder is then mixed with the cooling medium, and the cooling medium can wrap the carbon powder to form carbon-containing liquid droplets with a larger particle size. The carbon-containing liquid droplets are then sprayed into the high-temperature intake duct of the engine at a high speed. The outer layer of the cooling medium in the carbon-containing liquid droplets undergoes phase change to achieve the effect of enhanced heat exchange, and the remaining carbon powder particles in the carbon-containing liquid droplets enter the engine combustion chamber as fuel for auxiliary combustion, thereby ultimately achieving an improvement in the jet cooling effect of the TBCC combination engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of a device for improving the jet cooling effect of a TBCC combination engine according to the present invention;

[0022] In the figure, 1 is a carbon powder spiral input tube, 2 is a carbon powder output cylinder, 3 is a conical compressed air jet port, 4 is a Laval-shaped carbon powder outlet, 5 is a cooling medium flow channel, 6 is a conical cooling medium jet tube, 7 is a carbon powder particle surface treatment annular cavity, 8 is an active agent buffer annular cavity, 9 is a conical carbon powder jet tube, 10 is a carbon-containing droplet particle formation tube, 11 is a flared carbon-containing droplet particle injection tube, 12 is an active agent nozzle, 13 is a swirling carbon powder injection port, 14 is a swirl guide blade, 15 is a cooling medium swirl guide groove, 16 is a carbon powder particle screen, 17 is an active agent input port, and 18 is an active agent impurity removal filter. DETAILED DESCRIPTION

[0023] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0024] like Figure 1 As shown, a device for improving the jet cooling effect of a TBCC combination engine includes a carbon powder supply mechanism and a mixed jet mechanism; the carbon powder supply mechanism includes a carbon powder spiral input tube 1 and a carbon powder output cylinder 2, and the carbon powder spiral input tube 1 is arranged at the carbon powder output cylinder 2; a conical compressed air jet port 3 is provided at one end of the carbon powder output cylinder 2, and a Laval-shaped carbon powder outlet 4 is provided at the other end of the carbon powder output cylinder 2; the mixed jet mechanism includes a cooling medium flow channel 5, a conical cooling medium jet tube 6, a carbon powder particle surface treatment annular cavity 7, an active agent buffer annular cavity 8, a conical carbon powder jet tube 9, a carbon-containing liquid droplet particle formation tube 10, and a flared carbon-containing liquid droplet particle injection tube 11; the Laval-shaped carbon powder outlet 4 and the carbon powder particle surface treatment annular cavity are connected. 7 are connected; the conical cooling medium jet tube 6 is arranged at the outlet end of the cooling medium flow channel 5; the carbon powder particle surface treatment annular cavity 7 is arranged on the outside of the cooling medium flow channel 5 in the circumferential direction, the conical carbon powder jet tube 9 is arranged on the outlet end of the carbon powder particle surface treatment annular cavity 7, and the conical cooling medium jet tube 6 is located on the inner side of the conical carbon powder jet tube 9; the active agent buffer annular cavity 8 is arranged on the outside of the carbon powder particle surface treatment annular cavity 7 in the circumferential direction, and an active agent nozzle 12 is arranged between the active agent buffer annular cavity 8 and the carbon powder particle surface treatment annular cavity 7; the carbon-containing droplet particle forming tube 10 is arranged at the outlet end of the conical carbon powder jet tube 9; the flared carbon-containing droplet particle injection tube 11 is arranged at the outlet end of the carbon-containing droplet particle forming tube 10.

[0025] Specifically, the cooling medium in this embodiment is pure water, which has a high latent heat. The purpose of pre-treating the carbon powder surface with an activator is to improve surface wettability. Because the activator molecule has a hydrophilic group at one end and a hydrophobic group at the other, the selective action of the groups reduces the surface tension between water and the carbon powder particles, allowing water to spread more easily on the surface of the carbon powder particles to form a water film, which wraps the carbon powder particles and ultimately forms carbon-containing droplets. Based on the carbon powder particle size range of 2μm to 100μm, the carbon-containing droplets can achieve a particle size range of 3μm to 1000μm. Because the carbon-containing droplets have a larger droplet size than the original droplets, their heat transfer area is also increased. This increased droplet size also reduces their ability to follow the main flow in the engine's high-temperature intake duct, thereby increasing the velocity difference between the carbon-containing droplets and the main flow. This increased velocity difference also increases the heat transfer coefficient, thereby enhancing the heat transfer effect. In addition, when the carbon powder particles have a particle size range of 2μm to 100μm, they can be burned quickly after entering the engine combustion chamber, further ensuring the stability of the combustion process. In addition to pure water, other fluids with high latent heat can also be used as the cooling medium.

[0026] A rotary carbon powder injection port 13 is provided at the inlet end of the carbon powder particle surface treatment ring cavity 7. The number of the rotary carbon powder injection port 13 is one or more, and when the number of the rotary carbon powder injection port 13 is multiple, the multiple rotary carbon powder injection ports 13 are evenly distributed along the circumferential direction.

[0027] A swirl guide blade 14 is provided at the outlet end of the carbon powder particle surface treatment annular cavity 7 . The swirl guide blades 14 are in a plurality and are evenly distributed along the circumferential direction.

[0028] A cooling medium swirl guide groove 15 is provided on the inner surface of the outlet end of the cooling medium flow channel 5 , and the rotation direction of the cooling medium swirl guide groove 15 is opposite to that of the swirl guide vane 14 .

[0029] Specifically, the purpose of the rotation direction of the cooling medium swirl guide groove 15 being opposite to the rotation direction of the swirl guide blade 14 is to make the swirl direction of the carbon powder particles opposite to the swirl direction of the cooling medium. During the mixing process of the carbon powder particles and the cooling medium, the opposite swirl direction can increase the relative speed between the carbon powder particles and the cooling medium, thereby making the contact between the carbon powder particles and the cooling medium more complete, further improving the mixing efficiency and uniformity.

[0030] A carbon powder particle screen 16 is provided inside the carbon powder particle surface treatment ring cavity 7 and adjacent to the rotary carbon powder injection port 13 . The mesh size of the carbon powder particle screen 16 is determined according to the actual particle size of the carbon powder particles.

[0031] Specifically, the purpose of setting up the carbon powder particle screen 16 is because the carbon powder raw material will still contain a certain proportion of carbon powder particles with particle sizes exceeding the range. In order to prevent these carbon powder particles with particle sizes exceeding the range from entering the carbon powder particle surface treatment ring cavity 7, the carbon powder particle screen 16 is required to intercept the carbon powder particles with particle sizes exceeding the range, and only allow carbon powder particles that meet the particle size range to pass through the carbon powder particle screen 16 and enter the carbon powder particle surface treatment ring cavity 7.

[0032] An active agent input port 17 is provided at the inlet end of the active agent buffer annular cavity 8 , and an active agent impurity removal filter 18 is provided inside the active agent buffer annular cavity 8 adjacent to the active agent input port 17 .

[0033] There are a number of active agent nozzles 12 , which are arranged in two rows along the axial direction. The active agent nozzles 12 in each row are evenly distributed along the circumferential direction, and the active agent nozzles 12 in each row are staggered with each other.

[0034] In this embodiment, the particle size of the carbon powder particles inputted by the carbon powder spiral input tube 1 is in the range of 5 μm to 10 μm.

[0035] In this embodiment, the particle size of the carbon-containing liquid droplets formed in the carbon-containing liquid droplet forming tube 10 is in the range of 10 μm to 20 μm, and the jet mass ratio of the carbon powder particles used to form the carbon-containing liquid droplets to the cooling medium is 30%.

[0036] A method for improving the jet cooling effect of a TBCC combination engine, using the device for improving the jet cooling effect of a TBCC combination engine, specifically comprising:

[0037] First, carbon powder is introduced through the carbon powder spiral inlet pipe 1, compressed air is introduced through the conical compressed air jet port 3, cooling medium is introduced through the cooling medium flow channel 5, and activator is introduced through the activator inlet 17; when the carbon powder enters the carbon powder output cylinder 2 through the carbon powder spiral inlet pipe 1, it will be mixed with the compressed air introduced through the conical compressed air jet port 3 and be broken up and obtain an initial velocity, and then the carbon powder will be accelerated through the Laval-shaped carbon powder outlet 4 and enter the carbon powder particle surface treatment ring cavity 7 through the spiral carbon powder injection port 13, at this time, the carbon powder will move in a swirling flow in the carbon powder particle surface treatment ring cavity 7; at the same time, after the activator enters the activator buffer ring cavity 8 through the activator inlet 17, it will further enter the carbon powder particle surface treatment ring cavity 7 through the activator nozzle 12, and the carbon powder particles will be captured by the activator, realizing pretreatment of the carbon powder particle surface; then the carbon powder particles that have completed the surface pretreatment will be swirled The flow moves, and when the carbon powder particles pass through the swirl guide blades 14, the swirl of the carbon powder particles will be further enhanced, and then the carbon powder particles enter the conical carbon powder jet tube 9; at the same time, when the cooling medium passes through the cooling medium swirl guide groove 15, the cooling medium will form a swirl, and then the cooling medium in the swirl state will pass through the conical cooling medium jet tube 6 into the conical carbon powder jet tube 9 and mix with the carbon powder particles in the opposite direction of the swirl, and further mix in the carbon-containing liquid droplet particle forming tube 10 to form carbon-containing liquid droplet particles, and the carbon-containing liquid droplet particles will be sprayed into the high-temperature intake duct of the engine through the flared carbon-containing liquid droplet particle injection tube 11, and the outer layer of cooling medium in the carbon-containing liquid droplet particles is cooled by heat exchange through phase change, and the remaining carbon powder particles in the carbon-containing liquid droplet particles then enter the combustion chamber of the engine as fuel for auxiliary combustion, thereby finally completing the improvement of the jet cooling effect of the TBCC combination engine.

[0038] The solutions in the embodiments are not intended to limit the protection scope of the present invention. All equivalent implementations or changes that do not depart from the protection scope of the present invention are included in the protection scope of the present invention.

Claims

1. A device for improving the jet cooling effect of a TBCC combination engine, characterized by: The invention comprises a carbon powder supply mechanism and a mixed jet mechanism; the carbon powder supply mechanism comprises a carbon powder spiral input tube and a carbon powder output cylinder, the carbon powder spiral input tube is arranged at the carbon powder output cylinder; a conical compressed air jet port is provided at one end of the carbon powder output cylinder, and a Laval-shaped carbon powder outlet is provided at the other end of the carbon powder output cylinder; the mixed jet mechanism comprises a cooling medium flow channel, a conical cooling medium jet tube, a carbon powder particle surface treatment annular cavity, an active agent buffer annular cavity, a conical carbon powder jet tube, a carbon-containing liquid droplet particle forming tube and an expanded carbon-containing liquid droplet particle injection tube; the Laval-shaped carbon powder outlet is connected to the carbon powder particle surface treatment annular cavity; the conical cooling medium jet tube ... The carbon jet tube is arranged at the outlet end of the cooling medium flow channel; the carbon powder particle surface treatment annular cavity is arranged on the outside of the cooling medium flow channel in the circumferential direction, the conical carbon powder jet tube is arranged on the outlet end of the carbon powder particle surface treatment annular cavity, and the conical cooling medium jet tube is located on the inner side of the conical carbon powder jet tube; the active agent buffer annular cavity is arranged on the outside of the carbon powder particle surface treatment annular cavity in the circumferential direction, and an active agent nozzle is arranged between the active agent buffer annular cavity and the carbon powder particle surface treatment annular cavity; the carbon-containing droplet particle forming tube is arranged at the outlet end of the conical carbon powder jet tube; the flared carbon-containing droplet particle injection tube is arranged at the outlet end of the carbon-containing droplet particle forming tube.

2. The device for improving the jet cooling effect of a TBCC combination engine according to claim 1, characterized in that: A rotary carbon powder injection port is provided at the inlet end of the carbon powder particle surface treatment ring cavity. The number of the rotary carbon powder injection port is one or more, and when the number of the rotary carbon powder injection port is multiple, the multiple rotary carbon powder injection ports are evenly distributed along the circumferential direction.

3. The device for improving the jet cooling effect of a TBCC combination engine according to claim 1, characterized in that: A swirl guide blade is provided at the outlet end of the carbon powder particle surface treatment annular cavity. The number of the swirl guide blades is several and the swirl guide blades are evenly distributed along the circumferential direction.

4. The device for improving the jet cooling effect of a TBCC combination engine according to claim 1, characterized in that: A cooling medium swirl guide groove is provided on the inner surface of the outlet end of the cooling medium flow channel, and the rotation direction of the cooling medium swirl guide groove is opposite to the rotation direction of the swirl guide blade.

5. The device for improving the jet cooling effect of a TBCC combination engine according to claim 1, characterized in that: A carbon powder particle screen is provided inside the carbon powder particle surface treatment ring cavity and adjacent to the rotary carbon powder injection port. The mesh number of the carbon powder particle screen is determined according to the actual used particle size of the carbon powder particles.

6. The device for improving the jet cooling effect of a TBCC combination engine according to claim 1, characterized in that: An active agent input port is provided at the inlet end of the active agent buffer ring cavity, and an active agent impurity removal filter is provided inside the active agent buffer ring cavity adjacent to the active agent input port.

7. The device for improving the jet cooling effect of a TBCC combination engine according to claim 1, characterized in that: There are a number of active agent nozzles, which are arranged in two rows along the axial direction. The active agent nozzles in each row are evenly distributed along the circumferential direction, and the active agent nozzles in each row are staggered with each other.

8. The device for improving the jet cooling effect of a TBCC combination engine according to claim 1, characterized in that: The particle size of the carbon powder particles inputted by the carbon powder spiral input tube ranges from 2 μm to 100 μm.

9. The device for improving the jet cooling effect of a TBCC combination engine according to claim 1, characterized in that: The particle size of the carbon-containing liquid droplets formed in the carbon-containing liquid droplet particle forming tube ranges from 3 μm to 1000 μm, and the jet mass ratio of the carbon powder particles used to form the carbon-containing liquid droplets to the cooling medium is from 1% to 99%.

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