Water supply structure for increasing starting speed of water ramjet engine

Abstract

The invention relates to the technical field of water ramjet engines, and discloses a water supply structure for improving the starting speed of a water ramjet engine, the water supply structure is used for a grain type water ramjet engine, the water supply structure comprises a water injection section connected between a charging section and a combustion chamber, the water injection section is composed of an inner-layer cylindrical structure and an outer-layer cylindrical structure, and an annular cavity is formed between the inner-layer cylindrical structure and the outer-layer cylindrical structure; a primary water injection structure and a secondary water injection structure are sequentially arranged in the inner-layer cylindrical structure in the direction towards the outlet of the spray pipe and are communicated with external water supply through the annular cavity; the water outlet direction of the primary water injection structure is perpendicular to the end face of a grain in the charging section, and the water outlet direction of the secondary water injection structure faces the interior of the combustion chamber. The starting speed of the water ramjet engine can be effectively increased.

Description

Technical Field

[0001] The invention relates to the technical field of water ramjet engines, and in particular to a water supply structure for improving the starting speed of a water ramjet engine. Background Art

[0002] Water ramjet engines use metal fuel as energy. The metal fuel undergoes an oxidation reaction with water to release energy, vaporizing part of the water. At the same time, the reaction generates a large amount of gas, and then the mixed gas is ejected at high speed through the nozzle to do work. Since the metal fuel itself has a very low oxidant content, and the oxidant mostly comes from seawater outside the mine, the metal fuel has a high energy density. Compared with solid rocket propellants, carrying the same volume of fuel, the water ramjet engine can provide a longer range, and is the best power choice for the cruise phase of ultra-high-speed vehicles.

[0003] Most water ramjet engines use a water supply structure similar to that of solid rocket ramjet engines. After starting, the grain does not burn completely to produce a certain gas-solid mixture. After the mixture moves to the combustion chamber, it fully reacts with excess water to produce gas and vaporize part of the water, which is ejected at high speed to do work. Since the oxidant content in the metal fuel grain is very low, the amount of reaction product gas after starting is small and the fluidity is poor. It takes a certain amount of time to wait for the gas-solid mixture generated by the burning surface of the grain to gradually fill the cavity between the end face of the grain and the water injection port, and the metal fuel can begin to fully react with water. At the same time, after the metal fuel grain is started, it can only rely on its own heat transfer ability to gradually burn the grain, which easily leads to the problem of slow starting speed of the water ramjet engine. Summary of the invention

[0004] In view of this, the present invention provides a water supply structure for improving the starting speed of a water ramjet engine, thereby effectively improving the starting speed of the water ramjet engine.

[0005] The present invention is achieved through the following technical solutions: a water supply structure for improving the starting speed of a water ramjet engine, which is used for a charge-type water ramjet engine, comprising a water injection section connected between a charge section and a combustion chamber, wherein the water injection section is composed of inner and outer cylindrical structures, and an annular cavity is formed between the inner and outer cylindrical structures; a primary water injection structure and a secondary water injection structure are sequentially arranged inside the inner cylindrical structure toward the nozzle outlet, and both are connected to the external water supply through the annular cavity; the water outlet direction of the primary water injection structure is perpendicular to the end face of the charge in the charge section, and the water outlet direction of the secondary water injection structure is toward the inside of the combustion chamber.

[0006] Furthermore, a water supply pipeline is provided on the inner wall of the inner cylindrical structure, which is connected to the annular cavity and extends radially inward; the primary water injection structure includes a water outlet pipeline and a plurality of annular structures, and the water outlet pipeline is coaxially connected to the water supply pipeline through a jacket; a plurality of annular structures are coaxially sleeved in the water injection section and are all connected and fixed to the water outlet pipeline, and each annular structure is provided with a plurality of water outlets on the side facing the medicine column.

[0007] Furthermore, the primary water injection structure also includes a flange fixedly connected to the water supply pipeline, the flange is coaxial with the annular structure, and the annular structure located at the outermost circle is evenly provided with a plurality of radial ribs, and the ribs are all fixedly connected to the flange.

[0008] Furthermore, the farther the water outlet of the annular structure is from the water outlet pipeline, the larger the diameter of the water outlet.

[0009] Furthermore, the water outlet of each annular structure is evenly distributed in a 170° fan-shaped area on both sides of the water outlet pipeline.

[0010] Furthermore, the secondary water injection structure includes a plurality of nozzles uniformly arranged along the circumference of the inner cylindrical structure, the nozzles are all connected to the annular cavity, and the water outlet direction converges toward the axis of the combustion chamber.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. The water injection section of the present invention is provided with a primary water injection structure and a secondary water injection structure in sequence. The primary water injection structure supplies water to the burning surface of the charge. The water outlet direction of the primary water injection structure is perpendicular to the end surface of the charge. After the primary water contacts the burning surface of the charge, it reacts preliminarily with the ignited metal fuel, and can quickly form a gas-solid mixture with a certain speed, which moves toward the secondary water injection structure while reacting; it reaches the combustion chamber and further reacts with the secondary water to complete the starting process; and the problem of slow starting of the existing water ramjet engine is solved.

[0013] 2. The one-time water injection structure of the present invention is provided with a plurality of annular structures, each of which is provided with a plurality of water outlets. After the charge is ignited, the structure becomes loose, and the water outlet covers the burning surface of the charge relatively densely, and sprays a high flow of water, so that the burning surface of the charge is broken up in a small range over a large area, further expanding the burning surface, shortening the time for metal particles to contact the oxidant water, and accelerating the speed of generating a gas-solid mixture.

[0014] 3. The present invention connects the outer ring structure to the flange through the rib plate, thereby enhancing its anti-deformation force and avoiding deformation of the inner wall of the ring structure caused by water punching. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the general assembly of the present invention.

[0016] Figure 2 It is a cross-sectional view of the water injection section of the present invention.

[0017] Figure 3 This is a schematic diagram of the primary water injection structure of the present invention.

[0018] Among them, 1-charging section, 2-charge column, 3-water injection section, 4-combustion chamber, 5-primary water injection structure, 6-secondary water injection structure, 7-nozzle, 8-water inlet, 9-flange, 10-water supply pipeline, 11-water outlet pipeline. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0020] The present invention provides a water supply structure for improving the starting speed of a water ramjet engine, which is used for a charge-type water ramjet engine, such as Figure 1 As shown, the water supply structure includes a water injection section 3 connected between a charge section 1 and a combustion chamber 4. The charge section 1 is filled with a charge column 2, which is made of metal fuel. The end of the combustion chamber 4 is connected to a nozzle 7 for spraying the gaseous reactants in the combustion chamber 4 to generate thrust to propel the navigation body forward. Figure 2 As shown, the water injection section 3 is a double-layer structure, consisting of inner and outer cylindrical structures, and an annular cavity is formed between the inner and outer cylindrical structures; the outer cylindrical structure is provided with a water inlet 8 connected to an external water supply pump to provide water supply for the engine during operation.

[0021] A primary water injection structure 5 and a secondary water injection structure 6 are sequentially arranged inside the inner cylindrical structure toward the outlet of the nozzle 7, that is, the primary water injection structure 5 is close to the charge section 1, and the secondary water injection structure 6 is close to the combustion chamber 4; the water sprayed out of the primary water injection structure 5 is called primary water, and the water sprayed out of the secondary water injection structure 6 is called secondary water. Both the primary water injection structure 5 and the secondary water injection structure 6 are connected to the external water supply through the annular cavity; the water outlet direction of the primary water injection structure 5 is perpendicular to the end face of the charge column 2 in the charge section 1, and the water outlet direction of the secondary water injection structure 6 is toward the inside of the combustion chamber 4.

[0022] Specifically, a water supply pipeline 10 is provided on the inner wall of the inner cylindrical structure, and the water supply pipeline 10 is connected to the annular cavity and extends radially inward. As shown in 3, the primary water injection structure 5 includes a water outlet pipeline 11 and a plurality of annular structures, and the water outlet pipeline 11 is coaxially connected to the water supply pipeline 10 through a jacket; a plurality of annular structures are coaxially sleeved in the water injection section 3, and are all connected and fixed to the water outlet pipeline 11, and the axis of the annular structure and the water outlet pipeline 11 are perpendicular to each other, and each annular structure is provided with a plurality of circular holes as water outlets on the side facing the medicine column 2, which can provide the medicine column 2 with primary water with dense water column and large coverage area of ​​the medicine column. In order to ensure the consistency of the water flow rate of the annular structure, the farther the distance between the water outlet of the annular structure and the water outlet pipeline 11, the larger the diameter of the water outlet. The water outlet of each annular structure is evenly distributed in the 170° fan-shaped area on both sides of the water outlet pipeline 11.

[0023] The secondary water injection structure 6 includes a plurality of nozzles uniformly arranged along the circumference of the inner cylindrical structure. The nozzles are all connected to the annular cavity, and the water outlet direction converges toward the axis of the combustion chamber 4.

[0024] The number of annular structures can be determined according to the size of the engine, the number and diameter of the water outlets can be adjusted according to the end face of the charge 2, and the distance between the water outlet of the primary water injection structure 5 and the end face of the charge 2 can be adjusted according to the situation. The primary water injection structure 5 gives the charge 2 a primary water when the engine starts, and reacts with the ignited charge 2 at a certain speed, so that the charge 2 can be initially burned, and the charge 2 can quickly release a gas-solid mixture with a certain speed. The external water source has a certain pressure, so that the speed and flow rate of the water sprayed by the annular structure are stable. According to the diameter and number of the water outlets of the annular structure, the water output of the primary water is adjusted in advance, and quickly reacts with the metal fuel to achieve the purpose of increasing the starting speed of the water ramjet engine.

[0025] As an improvement, the primary water injection structure 5 further includes a flange 9 fixedly connected to the water supply pipeline 10, the flange 9 is coaxial with the annular structure, and the annular structure located in the outermost circle is evenly provided with a plurality of radial ribs, and the ribs are all fixedly connected to the flange 9. In other embodiments, the adjacent annular structures located in the inner circle can also be connected to each other through radial ribs. The ribs can effectively reduce the influence of water stamping on the inner wall of the annular structure and enhance its anti-deformation ability.

[0026] After the charge 2 is loaded and the water ramjet is assembled, the water ramjet starts to work, the charge 2 is ignited, and the external water supply pump is started to supply water to the inside of the water ramjet; the primary water injection structure 5 starts to discharge water, and each annular structure is provided with a plurality of water outlets to spray high-flow water, so that the primary water covers the burning surface of the charge 2 more densely, so that the loose structure of the burning surface of the charge 2 caused by combustion is impacted over a large area, the burning surface of the charge 2 is expanded, the time for the metal particles to contact the oxidant water is shortened, the metal fuel reacts quickly with water, and the speed of generating a gas-solid mixture is accelerated; the generated gas carries part of the incompletely reacted solid fuel to form a gas-solid mixture with a certain speed, and quickly passes through the water injection section 3, reaches the combustion chamber 4, and further reacts with the secondary water sprayed by the secondary water injection structure 6 in the combustion chamber 4, and the gas reactant is sprayed from the nozzle 7 at the end of the combustion chamber 4, generating thrust to push the navigation body forward.

[0027] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A water supply structure for improving the starting speed of a water ramjet engine, characterized in that: Used in a charge-type water ramjet engine, comprising a water injection section connected between a charge section and a combustion chamber, wherein the water injection section is composed of inner and outer cylindrical structures, and an annular cavity is formed between the inner and outer cylindrical structures; A primary water injection structure and a secondary water injection structure are arranged in sequence inside the inner cylindrical structure towards the nozzle outlet, and both are connected to the external water supply through an annular cavity; the water outlet direction of the primary water injection structure is perpendicular to the end face of the charge column in the charging section, and the water outlet direction of the secondary water injection structure is towards the inside of the combustion chamber.

2. The water supply structure for improving the starting speed of a water ramjet engine according to claim 1, characterized in that: A water supply pipeline is arranged on the inner wall of the inner cylindrical structure, and the water supply pipeline is communicated with the annular cavity and extends radially inward; The primary water injection structure includes a water outlet pipeline and several annular structures. The water outlet pipeline is coaxially connected to the water supply pipeline through a jacket; several annular structures are coaxially sleeved in the water injection section and are all connected and fixed to the water outlet pipeline. Each annular structure is provided with several water outlets on the side facing the medicine column.

3. The water supply structure for improving the starting speed of a water ramjet engine according to claim 2, characterized in that: The primary water injection structure also includes a flange fixedly connected to the water supply pipeline, the flange is coaxial with the annular structure, and the annular structure located at the outermost circle is evenly provided with a plurality of radial ribs, and the ribs are all fixedly connected to the flange.

4. The water supply structure for improving the starting speed of a water ramjet engine according to claim 3, characterized in that: The farther the water outlet of the annular structure is from the water outlet pipeline, the larger the diameter of the water outlet is.

5. The water supply structure for improving the starting speed of a water ramjet engine according to claim 2, characterized in that: The water outlet of each annular structure is evenly distributed in the 170° fan-shaped area on both sides of the water outlet pipe.

6. The water supply structure for increasing the starting speed of a water ramjet engine according to any one of claims 1 to 5, characterized in that: The secondary water injection structure comprises a plurality of nozzles uniformly arranged along the circumference of the inner cylindrical structure, the nozzles are all connected with the annular cavity, and the water outlet direction converges toward the axis of the combustion chamber.

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