An active thermal mixing infrared stealth structure

Abstract

The present invention provides an active thermal mixing flow infrared stealth structure, which mainly consists of a mixing flow heat exchanger, an active intake turbine, an infrared suppression housing, and a reflector; the mixing flow heat exchanger is composed of an inner cylinder, a boundary layer hybrid injector, a transition turbulent mixer, and an active air intake turbine; the boundary layer hybrid injector is composed of an exhaust gas inlet pipe, an intake cone pipe, end plate support A, a diversion nozzle, end plate support B, and a mixing flow inlet pipe; the transition turbulent mixer is composed of end plate support C, a diffuser, end plate support D, a spoiler, an exhaust cone pipe, and an exhaust pipe; a large amount of cold air in the environment is sucked into the device through active energy to mix and cool with the high-temperature exhaust gas, and the temperature of the engine exhaust gas is quickly reduced to eliminate the infrared characteristics and achieve the function of infrared hiding.

Description

Technical Field

[0001] The technology of the present invention relates to the field of infrared stealth technology, and particularly to an active thermal mixing infrared stealth structure. Background Art

[0002] With the extensive application of infrared detection technology and infrared precision guidance technology in the military field, and the development of various guided weapons and equipment, in order for various weapons and equipment on land, sea and air to have greater survivability in the battlefield environment, various stealth technologies including infrared stealth must be adopted to reduce the probability of being searched, tracked and locked. Especially for military logistics support vehicles on the ground, including motor vehicles, because of their relatively slow moving speed and low defense ability, hiding themselves is the most basic way to survive. Since the infrared system has higher resolution, better concealment than the radar system, and is not easily affected by electronic interference, and has the advantages of being able to recognize camouflage, working day and night, and being less affected by weather compared with the visible light system. Therefore, it is widely used in the military. However, at present, the infrared stealth technologies of various countries are mainly applied to aircraft and ships, and relatively few red stealth technologies suitable for ground military vehicles have been developed. Because of the high-speed flight of aircraft and the convenience of heat dissipation of watercraft, the heat dissipation means and heat dissipation effect of land motor vehicles are relatively limited, and it is impossible to quickly cool down the high temperature and high heat of the engine exhaust to eliminate the infrared signature. Summary of the Invention

[0003] The purpose of the technology of the present invention is to provide an active thermal mixing infrared stealth structure to solve the above-mentioned problems. By actively using energy to suck a large amount of cold air in the environment into the device and mix it with the high-temperature exhaust gas for cooling, the temperature of the engine exhaust gas can be quickly reduced to eliminate the infrared signature and achieve the function of infrared hiding.

[0004] To achieve the above purpose, the present invention provides the following technical solutions:

[0005] The present invention provides an active thermal mixing infrared stealth structure, which mainly consists of a mixing heat exchanger, an active intake turbine, an infrared suppression housing, and a reflector.

[0006] The described mixed-flow heat exchanger consists of an inner cylinder, a boundary layer hybrid injector, a transition turbulent mixer, and an active air inlet turbine. Among them, the boundary layer hybrid injector is tightly sleeved at one end of the inner cylinder and is composed of an exhaust gas inlet pipe, an intake cone pipe, end plate bracket A, a diversion nozzle, end plate bracket B, and a mixed-flow inlet pipe. The rear end of the exhaust gas inlet pipe is connected to the small end of the intake cone pipe, the bottom of the intake cone pipe is connected to end plate bracket A, and the hollow and through-hole diversion nozzle connects the two end plate brackets through the relative through-holes on end plate bracket A and end plate bracket B, enabling the air flow to pass through unobstructed in the outer spaces on both sides of the two end plate brackets. There are also through-holes at other plate positions on end plate bracket B except for the through-hole connected to the diversion nozzle. The mixed-flow inlet pipe passes through the inner cylinder and is connected between the cavities formed by end plate bracket A and end plate bracket B of the boundary layer hybrid injector and is in communication with this space. The transition turbulent mixer is tightly sleeved at the other end of the inner cylinder and is composed of end plate bracket C, a diffuser, end plate bracket D, a spoiler, an exhaust cone pipe, and an exhaust pipe. The hollow and through-hole diffuser connects the two end plate brackets through the relative through-holes on end plate bracket C and end plate bracket D, enabling the air flow to pass through unobstructed in the outer spaces on both sides of the two end plate brackets. The contraction pipe end of the diffuser is connected to the through-hole of end plate bracket C, and the diffuser pipe end of the diffuser is connected to the through-hole of end plate bracket D. There are through-holes at other plate positions on end plate bracket D except for the through-hole connected to the diffuser pipe. A spoiler is arranged outside the through-hole on end plate bracket D connected to the diffuser pipe. The end of the inner cylinder is connected to the exhaust cone pipe, and the small end side of the exhaust cone pipe is connected to the exhaust pipe to communicate with the outside. The lowest part of the inner cavity of the mixed-flow heat exchanger formed by the boundary layer hybrid injector and the transition turbulent mixer and the inner cylinder is provided with a condensate chamber, and a water level limiting pipe is arranged above the bottom of the condensate chamber.

[0007] The described active air inlet turbine is arranged at the inlet end of the mixed-flow inlet pipe.

[0008] The described infrared suppression housing consists of a shielding layer outer shell and a composite shielding layer. The composite shielding layer closely covers the outer periphery of the mixed-flow heat exchanger for heat insulation and heat preservation. A shielding layer outer shell is further equipped on the outer periphery of the composite shielding layer as the protective housing of the technical structure of the present invention. The mixed-flow inlet pipe, exhaust gas inlet pipe, and exhaust pipe of the mixed-flow heat exchanger pass through the infrared suppression housing and are directly communicated with the outside.

[0009] The described reflector is installed on the upper part of the outer periphery of the infrared suppression housing, and its function is to reflect the remaining temperature radiation on the surface of the infrared suppression housing to the ground without radiating to the equipment or components close to the technical structure of the present invention.

[0010] Further, the flow guiding nozzle of the boundary layer hybrid injector is a hollow through pipe with a conical orifice at one end. The conical orifice is located on the side connected to the through hole of the end plate bracket B. The area range where the flow guiding nozzle is connected to the end plate bracket A does not exceed the bottom range of the intake cone pipe. Through holes are also provided at other plate surface positions on the end plate bracket B except for the through hole connected to the flow guiding nozzle.

[0011] Further, the contraction pipes and the diffuser pipes at both ends of the diffuser are conical pipes with different diameters, with the diameter increasing from small to large and the large opening facing outward.

[0012] Further, the boundary layer hybrid injector and the transition turbulent mixer are jointly and tightly sleeved inside the inner cylinder. The conical orifice end of the flow guiding nozzle of the boundary layer hybrid injector faces the contraction pipe end of the diffuser of the transition turbulent mixer. The center of the conical orifice of the flow guiding nozzle and the center of the contraction pipe of the diffuser are on the same axis. The numbers of both are the same and they are paired, and the minimum number of paired sets is one.

[0013] Further, through holes are densely distributed on the barrel body of the inner cylinder. The condensed water in the condensed water chamber at the bottom of the inner cavity of the mixed flow heat exchanger infiltrates onto the composite shielding layer through these through holes.

[0014] Further, the minimum number of the mixed flow intake pipes is one, and the active intake air turbine installed therein is matched with it, and the minimum number is one.

[0015] Further, the outlet direction of the exhaust pipe is perpendicular to the ground.

[0016] Further, the water level limiting pipe passes through the infrared suppression housing and communicates with the external environment, and the pipe orifice does not exceed the surface of the shielding layer housing.

[0017] Further, the material of the composite shielding layer is a flexible heat insulating material with high and low temperature resistance and water absorption and sound absorption functions.

[0018] The beneficial effect of the present invention is that when the engine works and discharges exhaust gas, a large amount of cold air is sucked in to form a negative pressure through the injection structure for mixing and cooling. Further cooling and noise reduction are carried out in the transition turbulence. At the same time, the latent heat of vaporization of the condensed water is fully utilized to help with cooling. Through multi-gradient cooling, the infrared concealment function is realized, which is suitable for solving the infrared concealment requirements of land motor vehicles and heat engine equipment. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 : It is a structural schematic diagram of the present invention;

[0021] Figure 2 : It is a schematic diagram of the airflow in the present invention;

[0022] The serial numbers in the figure represent the components as follows:

[0023] 01. Tail gas inlet pipe: Connect the exhaust port of the engine to introduce the engine tail gas;

[0024] 02. Intake conical pipe: Guide the high-temperature tail gas to be evenly distributed into the guide pipe;

[0025] 03. End plate support A: Fix the guide pipe;

[0026] 04. Guide nozzle: Shunt and accelerate the tail gas;

[0027] 05. End plate support B: Fix the guide pipe and form a cold air inlet cavity with end plate support A;

[0028] 06. End plate support C: Fix the diffuser to position the constricted nozzle;

[0029] 07. Constriction tube: The mixing area of air and tail gas;

[0030] 08. Diffuser: A component that makes up the transition turbulent mixer;

[0031] 09. Diffusion pipe: The transition turbulent area of the mixed gas

[0032] 10. End plate support D: Fix the diffuser to position the diffuser nozzle;

[0033] 11. Turbulence plate: Strengthen the turbulence intensity of the mixed gas and extend the heat exchange time;

[0034] 12. Exhaust conical pipe: Guide the discharge of the mixed gas;

[0035] 13. Exhaust pipe: Guide the discharge direction of the tail gas;

[0036] 14. Mixed flow inlet pipe: Introduce cold air in the environment;

[0037] 15. Active intake turbine: Actively introduce cold air in the environment to supplement the working range with insufficient suction;

[0038] 16. Condensate chamber: Collect and store condensate;

[0039] 17. Inner cylinder: Fix the boundary layer hybrid injector and the transition turbulent mixer;

[0040] 18. Shielding layer housing: Protect the shielding layer

[0041] 19. Composite shielding layer: Insulates and thermally insulates the mixed-flow heat exchanger.

[0042] 20. Reflective cover: Reflects the excess thermal radiation on the surface of the infrared suppression housing to the ground without spreading to the equipment or components near the technical structure of the present invention.

[0043] 21. Water level limit tube: Discharges the excessive condensed water into the external environment. Detailed implementation manners

[0044] To make the objectives, technical solutions and advantages of the technology of the present invention clearer, the technical solutions of the technology of the present invention will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other implementation manners obtained by those of ordinary skill in the art based on the embodiments of the technology of the present invention without creative efforts belong to the scope protected by the technology of the present invention.

[0045] As Figure 1 and Figure 2 shown, an active thermal mixed-flow infrared concealment structure mainly consists of a mixed-flow heat exchanger, an active intake turbine, an infrared suppression housing, and a reflective cover 20.

[0046] The mixed-flow heat exchanger is composed of an inner cylinder 17, a boundary-layer hybrid injector, and a transition turbulent mixer. Among them, the boundary-layer hybrid injector is closely sleeved on one end of the inner cylinder 17 and consists of an exhaust gas inlet pipe 01, an intake cone pipe 02, an end plate bracket A03, a diversion nozzle 04, an end plate bracket B05, and a mixed-flow inlet pipe 14. The rear end of the exhaust gas inlet pipe 01 is connected to the small end of the intake cone pipe 02, the bottom of the intake cone pipe 02 is connected to the end plate bracket A03, and the hollow through-flow diversion nozzle 04 with a tapered hole connects the two end plate brackets through the relative through-holes on the end plate bracket A03 and the end plate bracket B05, making the spaces on both outer sides of the two end plate brackets communicate so that the air flow can pass through unobstructed. Through-holes are also provided at other plate surface positions on the end plate bracket B05 except for the through-hole connected to the diversion nozzle 04. The mixed-flow inlet pipe 14 passes through the inner cylinder 17 and is connected between the cavities formed by the end plate bracket A03 and the end plate bracket B05 of the boundary-layer hybrid injector and communicates with this space. The transition turbulent mixer is closely sleeved on the other end of the inner cylinder 17 and consists of an end plate bracket C06, a diffuser 08, an end plate bracket D10, a spoiler 11, an exhaust cone pipe 12, and an exhaust pipe 13. The diffuser 08 connects the two end plate brackets through the relative through-holes on the end plate bracket A03 and the end plate bracket B05, making the spaces on both sides of the two end plate brackets communicate so that the air flow can pass through unobstructed. The end of the contraction pipe 07 of the diffuser 08 is connected to the through-hole of the end plate bracket C06, and the end of the diffuser pipe 09 of the diffuser 08 is connected to the through-hole of the end plate bracket D10. Through-holes are provided at other plate surface positions on the end plate bracket D10 except for the through-hole connected to the diffuser pipe 09. A spoiler 11 is arranged outside the through-hole on the end plate bracket D10 connected to the diffuser pipe 09. The end of the inner cylinder 17 is connected to the bottom of the exhaust cone pipe 12, the small end side of the exhaust cone pipe 12 is connected to the exhaust pipe 13 and communicates with the outside, and the exhaust direction of the exhaust pipe 13 is perpendicular to the ground. The boundary-layer hybrid injector and the transition turbulent mixer are jointly and closely sleeved inside the inner cylinder 17. The tapered hole end of the diversion nozzle 04 of the boundary-layer hybrid injector faces the end of the contraction pipe 07 of the diffuser 08 of the transition turbulent mixer. The center of the tapered hole of the diversion nozzle 04 and the center of the contraction pipe 07 of the diffuser 08 are on the same axis, and the two are the same in number and are paired, and the minimum number of paired sets is one group. A condensate chamber 16 is provided at the bottom of the inner cavity of the mixed-flow heat exchanger composed of the boundary-layer hybrid injector, the transition turbulent mixer, and the inner cylinder 17. A water level limit pipe 21 is provided above the bottom of the condensate chamber 16 and communicates with the outside. The nozzle of the water level limit pipe 21 does not protrude from the surface of the shielding layer housing 18. The active intake air turbine 15 is arranged at the inlet end of the mixed-flow inlet pipe 14;The infrared suppression housing is composed of a shielding layer outer shell 18 and a composite shielding layer 19. The composite shielding layer 19 closely covers the periphery of the mixed-flow heat exchanger to insulate and heat it. The shielding layer outer shell 18 is then provided on the outer periphery of the composite shielding layer 19 as the protective housing of the technical structure of the present invention. The mixed-flow intake pipe 14, the tail gas intake pipe 01, and the exhaust pipe 13 of the mixed-flow heat exchanger penetrate outside the infrared suppression housing and are directly communicated with the outside; the reflector 20 is installed on the upper part of the outer periphery of the shielding layer outer shell 18, aiming to reflect the residual heat radiation on the surface of the infrared suppression housing to the ground without spreading to the equipment or components close to the technical structure of the present invention.;

[0047] When the active thermal mixing infrared concealment structure is working, the high-temperature flowing engine exhaust gas enters the intake cone 02 through the exhaust intake pipe 01 and then passes through the guide nozzle 04. The exhaust gas is accelerated through the cone pipe mouth of the guide nozzle 04 and sprayed into the contraction tube 07 of the transitional turbulent mixer. At the same time, negative pressure is formed on the rear side of the cone pipe mouth to generate suction. The cold air in the environment is sucked into the cavity formed by the end plate bracket A03 and the end plate bracket B05 through the mixed flow intake pipe 14 connected to the outside world. The cold air entering the cavity absorbs a part of the exhaust heat flowing through the guide nozzle 04 and then enters the end plate bracket B05 and the end plate bracket C06 from the through hole of the end plate bracket B05. The exhaust gas flows through the diffuser 09 and enters the exhaust cone 12 from the diffuser 09. The spoiler 11 on the outside of the diffuser 09 mouth of the end plate bracket D10 further increases the turbulent state of the exhaust gas, causing the exhaust gas to be cooled for the third time. Finally, most of the exhaust gas with high-temperature infrared characteristics eliminated is discharged from the exhaust pipe 13 to the external environment to achieve infrared stealth. Shielding function; a small part of the exhaust gas flows back through the through holes on the end plate bracket D10 into the cavity formed by the end plate bracket D10 and the end plate bracket C06 to absorb heat from the mixed exhaust gas flowing through the diffuser 08 to help cool it down; the exhaust gas will produce condensed water in the three step cooling processes, and the condensed water will be collected in the condensed water chamber 16 at the bottom of the mixed flow heat exchanger. The condensed water first penetrates into the composite shielding layer 19 through the through holes on the body of the inner cylinder 17 to absorb heat and evaporate to help cool the composite shielding layer 19. The remaining condensed water stored in the condensed water chamber 16 continues to absorb a large amount of exhaust heat in the mixed flow heat exchanger in the form of latent heat of steam to form steam, and then is discharged from the exhaust with the exhaust gas. The condensed water is discharged from the air pipe 13. When the excess water level of the condensed water is too high, it is discharged through the water level limiting pipe 21 on the condensed water chamber 16. Because the pipe mouth of the water level limiting pipe 21 does not protrude from the shielding layer shell 18, the condensed water will overflow to the surface of the shielding layer shell 18 when it is discharged from the water level limiting pipe 21, and evaporate by absorbing the residual heat on the surface of the shielding layer shell 18, taking away the last heat together; when the exhaust gas flow rate entering the active hot mixed flow infrared concealment structure is too low and the suction force generated is not enough to inhale a sufficient amount of external cold air, the active air intake turbine 15 is started to input a large amount of external cold air into the mixing transition turbulent cooling cycle to achieve the infrared concealment purpose.

[0048] The above is only a specific implementation method of the technology of the present invention, but the scope of protection of the present invention is not limited to this. Any technician familiar with this technical field can easily think of changes or replacements within the technical scope disclosed by the present invention, which should be covered by the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An active thermal mixing flow infrared concealment structure, characterized in that This structure includes a mixed-flow heat exchanger, an active intake turbine, an infrared suppression housing, and a reflector hood; The described mixed-flow heat exchanger consists of an inner cylinder, a boundary layer hybrid injector, a transition turbulent mixer, and an active air intake turbine; among them, the boundary layer hybrid injector is tightly sleeved at one end of the inner cylinder and is composed of an exhaust gas inlet pipe, an intake cone pipe, end plate support A, a diversion nozzle, end plate support B, and a mixed-flow inlet pipe. The rear end of the exhaust gas inlet pipe is connected to the small opening of the intake cone pipe, the bottom of the intake cone pipe is connected to end plate support A, and the hollow through-flow diversion nozzle connects the two end plate supports through the opposite through-holes on end plate support A and end plate support B, enabling the air flow to pass through unobstructed in the two outer spaces of the two end plate supports. Through-holes are also provided at other plate surface positions on end plate support B except for the through-hole connected to the diversion nozzle. The mixed-flow inlet pipe passes through the inner cylinder and is connected between the cavities formed by end plate support A and end plate support B of the boundary layer hybrid injector and communicates with this space; The described transition turbulent mixer is tightly sleeved at the other end of the inner cylinder and is composed of end plate support C, a diffuser, end plate support D, a spoiler, an exhaust cone pipe, and an exhaust pipe. The hollow through-flow diffuser connects the two end plate supports through the opposite through-holes on end plate support C and end plate support D, enabling the air flow to pass through unobstructed in the two outer spaces of the two end plate supports. The contraction tube end of the diffuser is connected to the through-hole of end plate support C, and the diffuser tube end of the diffuser is connected to the through-hole of end plate support D. Through-holes are provided at other plate surface positions on end plate support D except for the through-hole connected to the diffuser tube. A spoiler is provided outside the through-hole on end plate support D connected to the diffuser tube. The end of the inner cylinder is connected to the exhaust cone pipe, and the small opening side of the exhaust cone pipe is connected to the exhaust pipe to communicate with the outside; A condensate chamber is provided at the lowest side of the inner cavity of the mixed-flow heat exchanger formed by the boundary layer hybrid injector and the transition turbulent mixer and the inner cylinder, and a water level limiting tube is provided above the bottom of the condensate chamber; The described active air intake turbine is arranged at the inlet end of the mixed-flow inlet pipe; The described infrared suppression housing consists of a shielding layer outer shell and a composite shielding layer. The composite shielding layer closely covers the periphery of the mixed-flow heat exchanger for heat insulation and heat preservation, and a shielding layer outer shell is further equipped on the periphery of the composite shielding layer as a protective shell. The mixed-flow inlet pipe, exhaust gas inlet pipe, and exhaust pipe of the mixed-flow heat exchanger pass through the infrared suppression housing and directly communicate with the outside; The described reflector hood is installed on the upper part of the periphery of the infrared suppression housing; The described active thermal mixed-flow infrared concealment structure is characterized in that: the diversion nozzle of the boundary layer hybrid injector is a hollow through-pipe with a tapered hole at one end, and the tapered hole is located on the side connected to the through-hole of end plate support B. The area range where the diversion nozzle is connected to end plate support A does not exceed the bottom range of the intake cone pipe, and through-holes are provided at other plate surface positions on end plate support B except for the through-hole connected to the diversion nozzle; The described active thermal mixed-flow infrared concealment structure is characterized in that: through-holes are densely distributed on the barrel body of the inner cylinder, and the condensate in the condensate chamber at the lowest side of the inner cavity of the mixed-flow heat exchanger infiltrates onto the composite shielding layer through these through-holes.

2. The active thermal mixing flow infrared stealth structure according to claim 1, characterized in that: The contraction pipes and diffuser pipes at both ends of the diffuser are conical pipes with different diameters, with the diameter increasing from small to large and the large opening facing outward.

3. The active thermal mixing flow infrared stealth structure according to claim 1, characterized in that: The boundary layer hybrid injector and the transition turbulent mixer are jointly and tightly sleeved inside the inner cylinder. The conical orifice end of the diversion nozzle of the boundary layer hybrid injector is opposite to the contraction pipe end of the diffuser of the transition turbulent mixer. The center of the conical orifice of the diversion nozzle and the center of the contraction pipe of the diffuser are on the same axis. The numbers of both are the same and they are paired, and the minimum number of pairs is one group.

4. The active thermal mixing infrared stealth structure according to claim 1, characterized in that: The minimum number of the mixed-flow intake pipes is one, and the active intake turbine installed therein is matched with it, and the minimum number is one.

5. The active thermal mixing flow infrared stealth structure according to claim 1, characterized in that: The outlet direction of the exhaust pipe is perpendicular to the ground.

6. The active thermal mixing infrared stealth structure according to claim 1, characterized in that: The water level limit pipe passes through the infrared suppression housing and communicates with the external environment, and the pipe orifice does not exceed the surface of the shielding layer housing.

7. The active thermal mixing flow infrared stealth structure according to claim 1, characterized in that: The material of the composite shielding layer is a flexible heat-insulating material that is resistant to high and low temperatures and has the functions of water absorption and sound absorption.

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