Propelling device based on jet flow noise reduction

Abstract

The invention provides a propulsion device based on jet flow noise reduction, and belongs to the field of aircraft propulsion, and the propulsion device comprises an annular step arranged on the inner wall of a guide pipe; the propeller is arranged in the guide pipe; spouts are formed in the surfaces of the spherical nozzles; a plurality of grooves are formed in the annular side surface of the step around the propeller; the spherical nozzles are embedded in the grooves, hemispheres on one sides of the spherical nozzles are arranged in the grooves, hemispheres on the other sides of the spherical nozzles are located outside the grooves, the nozzles are formed in the hemispheres, located outside the grooves, of the spherical nozzles, the spherical nozzles conduct spherical rotation relative to the guide pipe, and the included angle between the direction of the nozzles and the axial direction of the propeller is changed. The spherical nozzle is embedded in the guide pipe, the orientation of the nozzle is changed through rotation of the sphere of the spherical nozzle, the included angle between the jet flow direction and the water flow direction in the propeller is adjusted, the blade tip gap vortex condition is adjusted, and then the noise condition generated by the blade tip gap vortex is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of ship propulsion technology, and in particular to a propelling device based on jet flow noise reduction. BACKGROUND

[0002] The ducted propeller propeller is composed of a propeller and an externally installed cylindrical guide pipe, as a form of underwater propulsion, widely used in surface ships and underwater submersible vehicles and other fields. The small gap between the guide pipe of the ducted propeller and the blade tip is called tip gap. When the propeller is in operation, a suction area is formed in front of the blade, and a pressure area is generated behind the blade. Fluids pass through the tip gap along the blade tip under the action of pressure difference, and move to the suction area. After entering the suction area, the fluid interacts with the low-pressure fluid, producing high-intensity vortex, called tip gap vortex. This flow is called tip gap flow (TLV). There is complex flow in the tip gap of the ducted propeller, and various size vortices are alternately shed. This unstable tip gap vortex not only affects the efficiency of the propeller, but also easily causes erosion damage to the propeller itself. In addition, the existence of tip gap vortex is easy to cavitate in the vortex core low pressure area to form cavitation bubbles. After the cavitation bubbles are generated, the noise of the propeller during operation will be directly increased.

[0003] Chinese patent CN112360750A discloses a tip gap vortex elimination device, which sets a carbon sliding block at the top of the blade tip. When the propeller rotates, the carbon sliding block contacts the inner wall of the guide pipe, thereby completely eliminating the tip gap. However, the above theory does not take into account the pressure difference between the front and rear of the blade. Even if the tip gap is completely eliminated, the fluid will still transfer from the pressure area to the suction area through other positions of the propeller under the action of the pressure difference, thereby causing more complex and uncontrollable vortex flow, which will still have adverse effects on the propelling efficiency and noise of the propeller.

[0004] Therefore, how to weaken the adverse effects of tip gap vortex on propeller noise reduction is an important topic for the research and design of ducted propellers. SUMMARY

[0005] Therefore, the present application provides a propelling device based on jet flow noise reduction, which solves the problem that the current design of ducted propellers is difficult to weaken the adverse effects of tip gap vortex on propeller noise reduction.

[0006] The technical scheme of the present application is implemented as follows: the present application provides a propelling device based on jet flow noise reduction, comprising a guide pipe, the inner wall of which is provided with an annular step; a propeller, which is arranged in the guide pipe; and a plurality of spherical nozzles, the surface of each of which is provided with a nozzle opening; wherein a plurality of grooves are formed in the annular side surface of the step and surround the propeller; the plurality of spherical nozzles are embedded in the plurality of grooves, one side of each of the spherical nozzles is arranged in the groove and the other side is arranged outside the groove, the nozzle opening is arranged on the side of the spherical nozzle that is outside the groove, and the spherical nozzles rotate relative to the guide pipe and change the angle between the nozzle opening and the axial direction of the propeller.

[0007] On the basis of the above technical scheme, preferably, the propelling device further comprises a stationary ring, a movable ring, a first liquid pipe and a second liquid pipe; a plurality of cavities are formed in the step, the cavities extend along the axial direction of the propeller at both ends, and one end of each of the cavities is connected to the groove; the stationary ring is arranged in the cavity and located in the middle of the cavity; the movable ring is coaxially arranged in the stationary ring and moves along the radial direction of the stationary ring; the first liquid pipe and the second liquid pipe are arranged in the cavity, one end of the first liquid pipe is connected to the surface of the spherical nozzle that faces the cavity and is connected to the nozzle opening, and the other end of the first liquid pipe is connected to the movable ring and is connected to the movable ring; one end of the second liquid pipe is connected to the movable ring and is connected to the movable ring, and the other end of the second liquid pipe extends outward from the guide pipe and extends to the outside, the end of the second liquid pipe that extends to the outside is connected to the first liquid pipe, the movable ring drives the spherical nozzle to rotate by the first liquid pipe when the movable ring moves relative to the stationary ring.

[0008] Further preferably, the propelling device further comprises at least three telescopic mechanisms, the telescopic mechanisms are arranged between the movable ring and the stationary ring and surround the movable ring, and the two ends of each of the telescopic mechanisms are hingedly connected to the outer wall of the movable ring and the inner wall of the stationary ring.

[0009] Further preferably, the propelling device further comprises at least three telescopic mechanisms, the telescopic mechanisms are arranged between the movable ring and the stationary ring and surround the movable ring, and the two ends of each of the telescopic mechanisms are hingedly connected to the outer wall of the movable ring and the inner wall of the stationary ring.

[0010] Further preferably, the propelling device further comprises at least three telescopic mechanisms, the telescopic mechanisms are arranged between the movable ring and the stationary ring and surround the movable ring, and the two ends of each of the telescopic mechanisms are hingedly connected to the outer wall of the movable ring and the inner wall of the stationary ring.

[0011] Further preferably, the propelling device further comprises a liquid ring, the liquid ring is coaxially arranged at one end of the guide pipe, the liquid ring is connected to the ends of the plurality of liquid channels that extend to the outside of the guide pipe, the liquid ring is connected to the plurality of liquid channels, and a liquid inlet pipe is arranged on the outer wall of the liquid ring.

[0012] Further preferably, the first liquid pipe and the second liquid pipe each comprise a main section and end sections arranged at both ends of the main section in the extension direction of the main section, the end sections being corrugated pipes; one end of the first liquid pipe connected to the moving ring is arranged as an end section, and both ends of the second liquid pipe are arranged as end sections; when the moving ring drives the end portions of the first liquid pipe and the second liquid pipe to move, the end sections are capable of stretching and bending.

[0013] Further preferably, the device further comprises a spring, the spring being sleeved on the first liquid pipe and connected to the side surface of the moving ring and the spherical surface of the spherical nozzle respectively.

[0014] On the basis of the above technical scheme, preferably, the propeller is provided with a blade; the conduit is provided with an inlet end and an outlet end at both ends respectively, and a step is arranged between the inlet end and the blade, and the nozzle sprays liquid flow towards the tip clearance of the blade.

[0015] Further preferably, the cross section of the annular side surface of the step along the axial direction of the conduit is trapezoidal, the long side of the trapezoid facing the outlet end, and the short side of the trapezoid facing the inlet end.

[0016] The propelling device based on jet flow noise reduction has the following beneficial effects relative to the prior art: (1) The device embeds a spherical nozzle in the conduit, changes the direction of the nozzle by rotating the spherical body of the spherical nozzle, adjusts the angle between the jet flow direction and the water flow direction inside the propeller, adjusts the vortex condition of the tip clearance, and further improves the noise condition caused by the vortex of the tip clearance.

[0017] (2) The device sleeves a moving ring between the two liquid pipes, changes the axial direction of the two liquid pipes by the relative displacement of the fixed moving ring, and drives the spherical nozzle to rotate the spherical body to adjust the jet flow direction.

[0018] (3) The two liquid pipes of the device are provided with corrugated pipes at both ends, so that when the end portions of the two liquid pipes are sleeved in the moving ring and translate with the moving ring, the corrugated pipes can stretch and bend, the axial direction of the liquid pipes is adjusted, and the spherical nozzle is driven to rotate.

[0019] (4) The device provides a liquid ring at the end portion of the conduit to simultaneously connect a plurality of spherical nozzles, and simultaneously supplies liquid to the plurality of spherical nozzles. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical schemes in the embodiments of the present application or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0021] Figure 1A side view of the propelling device of the present application; Figure 2 A side view of the propelling device of the present application; Figure 1 An enlarged view of A in the propelling device of the present application; Figure 3 A side view of the propelling device of the present application; Figure 1 An enlarged view of another state of A in the propelling device of the present application; Figure 4 A perspective view of the conduit of the present application; Figure 5 A side view of the propelling device of the present application; Figure 4 An enlarged view of B in the propelling device of the present application; Figure 6 A front view of the fixed ring and the movable ring of the present application; Figure 7 A front view of another state of the fixed ring and the movable ring of the present application; Figure 8 A side view of the first liquid pipe of the present application; Figure 9 A rear view of the conduit of the present application.

[0022] In the figure: 1, conduit; 11, step; 12, interface; 101, groove; 102, cavity; 103, liquid channel; 104, inlet end; 105, outlet end; 2, propeller; 21, blade; 3, spherical nozzle; 301, nozzle; 4, fixed ring; 5, movable ring; 6, first liquid pipe; 61, main section; 62, end section; 7, second liquid pipe; 8, telescopic mechanism; 9, liquid ring; 91, liquid inlet pipe; 10, spring. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0024] As shown in the figure, in conjunction with the fixed ring 4, the movable ring 5 and the telescopic mechanism 8, the propelling device of the present application is a propelling device based on jet flow noise reduction, mainly referring to a conduit propeller, thus including the conduit 1, the propeller 2 and the spherical nozzle 3. Figure 1 Figure 2 Figure 3 As shown in the figure, in conjunction with the fixed ring 4, the movable ring 5 and the telescopic mechanism 8, the propelling device of the present application is a propelling device based on jet flow noise reduction, mainly referring to a conduit propeller, thus including the conduit 1, the propeller 2 and the spherical nozzle 3.

[0025] ​​The water flow enters one end of the conduit 1 and is ejected from the other end to form a propelling water flow. The inner wall of the conduit 1 is provided with an annular step 11 which protrudes into the interior of the conduit 1. A plurality of grooves 101 are formed in the annular side surface of the step 11 and surround the propeller 2. In this embodiment, the step 11 is annular, but in actual implementation, a plurality of steps 11 can be arranged axially around the conduit 1, and each step 11 is provided with a spherical nozzle 3.

[0026] The propeller 2 is arranged in the conduit 1. The propeller 2 generates a propelling force through rotation. The propeller 2 has a blade 21, and a gap exists between the blade tip of the blade 21 and the inner wall of the conduit 1, which is a blade tip gap. When the water flow enters the conduit 1 under the action of the propelling force generated by the rotation of the propeller 2 and flows through the blade tip gap, a complex tip gap vortex is generated at the position of the blade tip gap, and in turn, a large noise is generated.

[0027] The surface of the plurality of spherical nozzles 3 is provided with a nozzle 301. The spherical nozzle 3 can adopt a metal ball head nozzle commonly used in the current food and pharmaceutical industry. The plurality of spherical nozzles 3 are embedded in the plurality of grooves 101. A ball can be arranged on the inner wall of the groove 101 to enable the spherical nozzle 3 to rotate smoothly. One side of the spherical nozzle 3 is arranged in the groove 101, and the other side is arranged outside the groove 101. The nozzle 301 is arranged on the side of the spherical nozzle 3 outside the groove 101, so that the nozzle 301 has a large range of rotation when the spherical nozzle 3 rotates. Generally, the rotatable angle range of the spherical nozzle 3 is not greater than 45°. If the rotatable angle of the spherical nozzle 3 is too large, the jet flow generated by the nozzle 301 may not be directed to the tip clearance, but may adversely affect the propelling flow. The spherical nozzle 3 rotates relative to the duct 1 and changes the angle between the nozzle 301 and the axis of the propeller 2. Since the propelling device is mainly used in underwater vehicles, the nozzle 301 preferably sprays water. The principle of the scheme is as follows: first, the tip clearance area of the propeller 2 will generate a low pressure distribution due to the rotation of the propeller 2, and then a complex tip vortex will be generated, and then a tip vortex cavitation phenomenon will be formed. By spraying water into the tip clearance through the spherical nozzle 3, the jet flow will interact with the tip vortex flow, which can not only weaken the pressure difference and alleviate the development of the tip vortex, but also fill the tip vortex cavitation, thereby avoiding the generation of large noise by the tip vortex cavitation. Second, under different rotating speeds or working conditions of the propeller 2, the tip vortex and tip cavitation have great differences. Therefore, by rotating the spherical nozzle 3 to change the jet direction of the nozzle 301 and adjust the jet speed of the nozzle 301, the tip vortex development and tip cavitation development can be controlled, thereby improving the noise reduction of the propeller. It should be noted that the scheme is mainly designed for the mechanical structure of the propelling device based on jet noise reduction, and does not involve how to control the tip vortex and tip cavitation by adjusting the jet direction, jet flow and jet speed. Therefore, only the principle of controlling the tip clearance cavitation by the jet is described, and the jet control method is not described in detail.

[0028] In Figure 4 and Figure 5 In an optional embodiment shown in the drawings, in order to realize the spherical rotation function of the spherical nozzle 3, a stationary ring 4, a movable ring 5, a first liquid pipe 6 and a second liquid pipe 7 are further included.

[0029] The step 11 is internally provided with a plurality of cavities 102. In actual implementation, the step 11 can be arranged as a shell covering the inner wall of the duct 1, which helps to reduce the production and assembly difficulty. The cavities 102 extend along the axis of the propeller 2 at both ends, and one end of the cavity 102 is in communication with the groove 101.

[0030] The fixed ring 4 is arranged in the cavity 102 and located in the middle of the cavity 102, and is fixed relative to the step 11, but the position of the fixed ring 4 in the cavity 102 can be adjusted according to the type of propeller or the working condition requirement. For example, when the fixed ring 4 is closer to the spherical nozzle 3, the rotation angle of the spherical nozzle 3 will be larger when the first liquid pipe 6 is driven to rotate the spherical nozzle 3 by the same distance through the translation of the movable ring 5; otherwise, the rotation angle will be smaller.

[0031] The movable ring 5 is coaxially arranged in the fixed ring 4, and moves along the radial direction of the fixed ring 4 relative to the fixed ring 4. The movable range of the movable ring 5 is determined by the size of the inner diameter of the fixed ring 4 and the movable ring 5, and in turn determines the rotation angle range of the spherical nozzle 3.

[0032] The first liquid pipe 6 and the second liquid pipe 7 are arranged in the cavity 102. One end of the first liquid pipe 6 is connected to the surface of the spherical nozzle 3 facing the cavity 102 and communicates with the nozzle 301, and the other end of the first liquid pipe 6 is connected to the movable ring 5 and communicates with the movable ring 5. One end of the second liquid pipe 7 is connected to the movable ring 5 and communicates with the movable ring 5, and the other end of the second liquid pipe 7 extends outwardly away from the spherical nozzle 3 through the catheter 1, and the end portion extending to the outside world is inwardly supplied with liquid and sequentially passes through the second liquid pipe 7, the movable ring 5 and the first liquid pipe 6, and is sprayed out from the nozzle 301.

[0033] When the movable ring 5 moves relative to the fixed ring 4, the movable ring 5 drives the spherical nozzle 3 to rotate through the first liquid pipe 6. Specifically, the end of the first liquid pipe 6 and the second liquid pipe 7 is moved by the translation of the movable ring 5, and since the spherical nozzle 3 is arranged at the end of the cavity 102 and its relative position to the step 11 is fixed, the first liquid pipe 6 is offset at one end and fixed at the other end, which produces a lever effect, and in turn drives the spherical nozzle 3 to rotate.

[0034] In Figure 6In an optional embodiment shown, at least three telescopic mechanisms 8 are further included, which are preferably telescopic poles, and are arranged around the moving ring 5 between the moving ring 5 and the fixed ring 4, and are hingedly connected at both ends to the outer wall of the moving ring 5 and the inner wall of the fixed ring 4. In a specific implementation, in order to accurately control the rotation angle of the spherical nozzle 3 by controlling the translation distance of the moving ring 5, a displacement sensor can be arranged between the moving ring 5 and the fixed ring 4, and a three-dimensional Cartesian coordinate system is established with the center of the fixed ring 4 as the origin, for example, two mutually perpendicular diameters of the fixed ring 4 are taken as the x-axis and the outer circumference, and an axial line passing through the center of the fixed ring 4 is taken as the z-axis. At this time, the coordinates of the spherical nozzle 3 in the three-dimensional coordinate system are fixed, while the center of the moving ring 5 (i.e. the connecting end of the first liquid pipe 6 and the moving ring 5) moves on the xy plane of the three-dimensional coordinate system, and the xy direction displacement of the center of the moving ring 5 is related to the telescopic length of each telescopic mechanism 8, so the rotation angle of the spherical nozzle 3 can be calculated in combination with the above parameters.

[0035] In Figure 7 In an optional embodiment shown, there are eight telescopic mechanisms 8, and the hingedly connected parts of each adjacent two telescopic mechanisms 8 on the outer wall of the moving ring 5 are located at the same position, and the hingedly connected parts of each adjacent two telescopic mechanisms 8 on the inner wall of the fixed ring 4 are also located at the same position. When the initial lengths of the eight telescopic mechanisms 8 are the same, the eight telescopic mechanisms 8 form an equilateral octagon. Under this design, when the moving ring 5 moves in each direction, it will be subjected to the resultant force of two telescopic thrusts arranged in a triangle at the top of the triangle, so that the flexibility of the moving ring 5 is greater and the moving speed is faster; at the same time, the telescopic length of the telescopic mechanism 8 is greater than the displacement of the moving ring 5, so that the displacement of the moving ring 5 is more accurate.

[0036] In Figure 2 In an optional embodiment shown, a plurality of liquid channels 103 are arranged inside the pipe wall of the conduit 1, one end of the liquid channel 103 is connected to the end of the cavity 102 away from the groove 101, and the other end of the liquid channel 103 extends to the outside of the conduit 1. The end of the liquid channel 103 connected to the cavity 102 is provided with a connector 12, the connector 12 is connected to the end of the second liquid pipe 7 away from the moving ring 5, and the liquid channel 103 is connected to the second liquid pipe 7 in communication, and the liquid channel 103 is used to deliver liquid to the second liquid pipe 7. A plurality of liquid pumping devices can be arranged on the outer end surface of the conduit 1, and the plurality of liquid pumping devices are connected to the outer ends of the plurality of liquid channels 103, and the liquid pumping devices control the liquid flow delivery amount to regulate the jet flow amount and jet flow speed of the spherical nozzle 3. The liquid supply source of the liquid pumping device can be directly obtained from the water environment of the vehicle.

[0037] In Figure 9In an optional embodiment shown, a liquid ring 9 is coaxially arranged at one end of the duct 1, and the liquid ring 9 is connected to the ends of the liquid channels 103 extending out of the duct 1, and the liquid ring 9 is in communication with the liquid channels 103, and the liquid ring 9 is provided with an inlet pipe 91 on the outer wall. The liquid ring 9 can simultaneously deliver liquid flow to the liquid channels 103 and control the flow rate and velocity of the jet flow of the spherical nozzles 3, so that the flow rate and velocity of the jet flow of the spherical nozzles 3 are consistent. This design is more suitable for the jet flow control requirement under low speed working conditions, because under low speed working conditions, the jet flow direction control is the main control factor for adjusting the tip cavitation of the blade.

[0038] In Figure 8 In an optional embodiment shown, the first liquid pipe 6 and the second liquid pipe 7 each include a main section 61 and end sections 62 arranged at both ends of the main section 61 in the extension direction, and the end sections 62 are corrugated pipes; one end of the first liquid pipe 6 connected to the moving ring 5 is provided as an end section 61, and both ends of the second liquid pipe 7 are provided as end sections 61; when the moving ring 5 moves with the end portions of the first liquid pipe 6 and the second liquid pipe 7, the end sections 62 stretch, contract and bend. Since the positions of the joint 12 and the spherical nozzle 3 are fixed, when the connection ends of the first liquid pipe 6 and the second liquid pipe 7 move with the moving ring 5, the end portions of the first liquid pipe 6 and the second liquid pipe 7 need to bend accordingly, so the end section 61 is provided as a corrugated pipe; and the end of the first liquid pipe 6 connected to the spherical nozzle 3 drives the spherical nozzle 3 to rotate, so it does not need to bend and does not need to be provided as a corrugated pipe.

[0039] In Figure 3 In an optional embodiment shown, a spring 10 is sleeved on the first liquid pipe 6, and the spring 10 is connected to the side surface of the moving ring 5 and the spherical surface of the spherical nozzle 3 respectively. The spring 10 serves to pull the spherical nozzle 3 by its elastic rebound, so as to avoid the spherical nozzle 3 from being separated from the groove 101 when rotating in the groove 101.

[0040] In Figure 1 In an optional embodiment shown, the propeller 2 is provided with a blade 21; the duct 1 is provided with an inlet end 104 and an outlet end 105 at both ends, and the step 11 is arranged between the inlet end 104 and the blade 21, and the nozzle 301 sprays liquid flow towards the tip gap of the blade 21. The jet flow direction provided by the spherical nozzle 3 is substantially consistent with the direction of the propelling water flow generated by the propeller 2, so as to avoid the relative flow directions of the two to affect the jet flow noise reduction effect.

[0041] In Figure 1In an optional embodiment shown, the annular side surface of the step 11 has a trapezoidal shape in axial cross section of the conduit 1, the long side of the trapezoid facing the outlet end 105, and the short side of the trapezoid facing the inlet end 104, so that the annular side surface of the step 11 is a diverging taper, which facilitates the interaction of the advancing water flow with the jet issue as it flows through the tip gap along the taper.

[0042] The above description is only the preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A propulsion device based on jet noise reduction, characterized in that, include: The conduit (1) has an annular step (11) on its inner wall. A propeller (2) is disposed inside the duct (1); Several spherical nozzles (3) are provided with nozzles (301) on their surfaces; Among them, the annular side of the step (11) is provided with a number of grooves (101) around the propeller (2). Several spherical nozzles (3) are embedded in several grooves (101). One side hemisphere of the spherical nozzle (3) is located in the groove (101) and the other side hemisphere is located outside the groove (101). The nozzle (301) is located on the hemisphere of the spherical nozzle (3) located outside the groove (101). The spherical nozzle (3) rotates relative to the guide tube (1) and the angle between the nozzle (301) and the axis of the propeller (2) changes.

2. The propulsion device based on jet noise reduction according to claim 1, characterized in that: It also includes a fixed ring (4), a moving ring (5), a first liquid pipe (6), and a second liquid pipe (7); The step (11) has several cavities (102) inside. Both ends of the cavity (102) extend along the axial direction of the propeller (2). One end of the cavity (102) is connected to the groove (101). The fixed ring (4) is sleeved inside the cavity (102) and located in the middle of the cavity (102); The moving ring (5) is coaxially sleeved inside the fixed ring (4), and the moving ring (5) moves radially relative to the fixed ring (4); The first liquid pipe (6) and the second liquid pipe (7) are both disposed in the cavity (102). One end of the first liquid pipe (6) is connected to the surface of the spherical nozzle (3) facing the cavity (102) and communicates with the nozzle (301). The other end of the first liquid pipe (6) is connected to the moving ring (5) and communicates with the moving ring (5). One end of the second liquid tube (7) is connected to the moving ring (5) and communicates with the moving ring (5). The other end of the second liquid tube (7) extends outward through the conduit (1) in a direction away from the spherical nozzle (3). Liquid is transported inward from the end of the second liquid tube (7) extending to the outside and passes through the second liquid tube (7), the moving ring (5) and the first liquid tube (6) in sequence before being ejected from the nozzle (301). When the moving ring (5) moves relative to the fixed ring (4), the moving ring (5) drives the spherical nozzle (3) to rotate through the first liquid pipe (6).

3. The propulsion device based on jet noise reduction according to claim 2, characterized in that: It also includes at least three telescopic mechanisms (8), which are arranged around the moving ring (5) between the moving ring (5) and the fixed ring (4). The two ends of the telescopic mechanism (8) are respectively hinged to the outer wall of the moving ring (5) and the inner wall of the fixed ring (4).

4. The propulsion device based on jet noise reduction according to claim 3, characterized in that: There are eight telescopic mechanisms (8). The hinge connection of each two adjacent telescopic mechanisms (8) on the outer wall of the moving ring (5) is located at the same position. The hinge connection of each two adjacent telescopic mechanisms (8) on the inner wall of the fixed ring (4) is also located at the same position. When the initial lengths of the eight telescopic mechanisms (8) are the same, the eight telescopic mechanisms (8) form an equilateral octagon.

5. A propulsion device based on jet noise reduction according to claim 2, characterized in that: The conduit (1) has several liquid channels (103) inside its wall. One end of each liquid channel (103) is connected to the end of the cavity (102) away from the groove (101). The other end of each liquid channel (103) extends outside the conduit (1). The end of each liquid channel (103) connected to the cavity (102) is provided with an interface (12). The interface (12) is connected to the end of the second liquid tube (7) away from the moving ring (5), and the liquid channel (103) is connected to the second liquid tube (7). The liquid channel (103) is used to deliver liquid into the second liquid tube (7).

6. A propulsion device based on jet noise reduction according to claim 5, characterized in that: It also includes a liquid ring (9), which is coaxially disposed at one end of the conduit (1). The liquid ring (9) is simultaneously connected to the ends of several liquid channels (103) extending outside the conduit (1). The liquid ring (9) is simultaneously connected to several liquid channels (103). An inlet pipe (91) is provided on the outer wall of the liquid ring (9).

7. A propulsion device based on jet noise reduction according to claim 5, characterized in that: The first liquid pipe (6) and the second liquid pipe (7) each include a main section (61) and an end section (62). The end section (62) is located at the end of the main section (61) in the extension direction. The end section (62) is a corrugated pipe. The end of the first liquid pipe (6) connected to the moving ring (5) is set as the end section (61), and both ends of the second liquid pipe (7) are set as end sections (61). When the moving ring (5) drives the ends of the first liquid pipe (6) and the second liquid pipe (7) to move, the end section (62) extends, retracts and bends.

8. A propulsion device based on jet noise reduction according to claim 2, characterized in that: It also includes a spring (10), which is sleeved on the first liquid tube (6) and is connected to the side of the moving ring (5) and the spherical surface of the spherical nozzle (3).

9. A propulsion device based on jet noise reduction according to claim 1, characterized in that: The propeller (2) is provided with blades (21); the two ends of the guide tube (1) are respectively set as an inlet (104) and an outlet (105), the step (11) is set between the inlet (104) and the blade (21), and the nozzle (301) sprays liquid flow toward the blade tip gap of the blade (21).

10. A propulsion device based on jet noise reduction according to claim 9, characterized in that: The annular side of the step (11) has a trapezoidal cross-sectional shape along the axial direction of the guide tube (1), with the long side of the trapezoid facing the outlet (105) and the short side of the trapezoid facing the inlet (104).

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