CN111120461A - Underwater flow excitation cavity noise control device - Google Patents
Underwater flow excitation cavity noise control device Download PDFInfo
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- CN111120461A CN111120461A CN202010060593.6A CN202010060593A CN111120461A CN 111120461 A CN111120461 A CN 111120461A CN 202010060593 A CN202010060593 A CN 202010060593A CN 111120461 A CN111120461 A CN 111120461A
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- cavity
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- extension shaft
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
- F15D1/00—Influencing flow of fluids
- F15D1/002—Influencing flow of fluids by influencing the boundary layer
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
- F15D1/00—Influencing flow of fluids
- F15D1/002—Influencing flow of fluids by influencing the boundary layer
- F15D1/0025—Influencing flow of fluids by influencing the boundary layer using passive means, i.e. without external energy supply
- F15D1/0055—Influencing flow of fluids by influencing the boundary layer using passive means, i.e. without external energy supply comprising apertures in the surface, through which fluid is withdrawn from or injected into the flow
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- General Engineering & Computer Science (AREA)
- Hydraulic Turbines (AREA)
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Abstract
The invention discloses an underwater flow excited cavity noise control device which comprises a support, a driving unit and a shunt body, wherein the support is arranged on the upper surface of a cavity body, and the upper surface of the cavity body is provided with a cavity opening communicated with an inner cavity of the cavity body; the bracket is provided with the flow divider at a position corresponding to the cavity opening, the flow divider comprises a right triangular prism and an extension shaft arranged on the right triangular prism, and the extension shaft is arranged on at least one bottom surface; three side surfaces of the right triangular prism are respectively a diversion surface facing the incoming flow and facing the cavity body, a back flow surface deviating from the incoming flow and a flow guide surface connecting the diversion surface and the back flow surface; the extension shaft is connected with the driving unit and used for driving the right triangular prism to rotate around the axis of the extension shaft. The flow splitting body of the invention inhibits the boundary layer separation of the orifice on one hand, and reduces the velocity gradient of the orifice shear layer on the other hand, thereby effectively inhibiting the oscillation of the orifice shear layer and reducing the noise of the flow-induced cavity.
Description
Technical Field
The invention belongs to the technical field of hydrodynamic noise control, and particularly relates to a noise control device for an underwater flow excitation cavity.
Background
The cavity is widely arranged at the opening part of the underwater navigation body, when a turbulent boundary layer on the surface of the navigation body flows through the openings, a turbulent shear layer is formed at an opening (cavity opening), and the shear layer, a guide edge and a following edge of the cavity opening and the fluid in the cavity interact with each other to form violent self-sustaining oscillation at the cavity opening, so that larger speed and pressure pulsation are caused, and strong line spectrum noise, namely cavity noise, is radiated to seriously influence the concealment of the underwater navigation body.
The mechanism of cavity noise is very complex, and in general, typical cavity noise includes the following mechanism features: the turbulent boundary layer is separated at the cavity opening guide edge and forms shear flow with oscillation characteristics at the cavity opening, when the shear layer reaches the cavity opening trailing edge, the shear layer collides with the trailing edge and generates pressure pulsation, the pressure pulsation propagates upstream to the guide edge and further influences the boundary layer separation of the guide edge, when the feedback phase of the pressure pulsation is identical to the boundary layer separation phase, the shear layer is disturbed to form a closed acoustic feedback ring, namely, self-sustained oscillation of the cavity opening shear layer is generated, and the self-sustained oscillation can also generate coupling resonance in various forms with a cavity acoustic mode and a cavity elastic structure mode, so that strong line spectrum noise is radiated. Willam Blake states in his monograph "Mechanics of flow-Induced Noise": the most effective way to suppress cavity noise is to reduce or eliminate the development of the shearing layer of the orifice, followed by the destruction or blocking of the formation of the acoustic feedback loop (blank W K. mechanics of Flow Induced Sound and vibration [ M ]. Academic Press,1986: 130-. In the past, measures such as changing the shape of a cavity opening, installing a grating and the like are mainly adopted for controlling the noise of the underwater flow excited cavity, the control effect is not obvious, and the main reason is that the control measures do not weaken the development of a shear layer or destroy a cavity opening sound feedback ring.
In the field of pneumatic noise control, a Cavity noise suppression mode that a cylinder is arranged above a Cavity leading edge in a direction perpendicular to an incoming flow direction is proposed in the United states patent air Cavity Acoustic resource suppression System (US005699981), and a large number of shedding vortexes generated by cylindrical streaming collide with a Cavity mouth shear layer vortex to dissipate the turbulent kinetic energy of the shear layer, so that the development of the shear layer is weakened, and the Cavity noise is suppressed. The literature (Rona A. control of transduction flow stability by means of flow side air injection [ C ]//42nd AIAA Aerosapacesciences Meeting and inhibition.2004: 682.) describes a cavity noise suppression method of actively injecting fluid below the cavity leading edge, and by injecting external fluid, the velocity gradient of cavity mouth flow can be reduced, the development of a shear layer is slowed down, and the cavity noise is further reduced.
The two types of cavity noise control devices applied to air can be used for reference of water cavity noise control, but the improvement is still needed in the aspects of low self noise, high applicability, easy installation and use and the like.
Disclosure of Invention
In view of the above defects or improvement needs of the prior art, the present invention provides an underwater flow cavity noise control device with low self-noise, high applicability and easy installation and use, which can significantly reduce the flow cavity noise at the opening part of the underwater vehicle.
To achieve the above object, according to one aspect of the present invention, there is provided an underwater flow excitation cavity noise control device, comprising a bracket, a driving unit, and a flow dividing body, wherein,
the support is arranged on the upper surface of the cavity body, the upper surface of the cavity body is provided with a cavity opening communicated with the inner cavity of the cavity body, and the driving unit is arranged in the support in a sealing mode;
the bracket is provided with the flow divider at a position corresponding to the cavity opening, the flow divider comprises a right triangular prism and an extension shaft arranged on the right triangular prism, the right triangular prism is provided with two bottom surfaces which are parallel to each other, three side surfaces and three side edges which are positioned between the two bottom surfaces, the extension shaft is arranged on at least one bottom surface, the extension shaft is horizontally arranged and is vertical to the horizontal incoming flow direction, and the side edges of the right triangular prism are parallel to the extension shaft;
three side surfaces of the right triangular prism are respectively a diversion surface facing the incoming flow and facing the cavity body, a back flow surface deviating from the incoming flow and a flow guide surface connecting the diversion surface and the back flow surface, the height of the diversion surface is gradually reduced along the same direction as the incoming flow direction, and the side edge with larger height on the diversion surface is positioned above the cavity opening;
the extension shaft is connected with the driving unit to drive the right triangular prism to rotate around the axis of the extension shaft, so that the driving unit adjusts the distance h between the lateral edge of the diversion surface of the right triangular prism, which is far away from the upper surface of the cavity body, and the upper surface of the cavity body according to the flow rate of incoming flow.
Preferably, the device further comprises a sealing bearing, and the protruding shaft is mounted on the bracket through the sealing bearing.
Preferably, the upper surface of the cavity body is parallel to the incoming flow.
Preferably, the cavity opening is a rectangular opening, two inner walls of the cavity opening perpendicular to the incoming flow direction are respectively a cavity opening guide edge and a cavity opening following edge, the upstream inner wall is a cavity opening guide edge, and the downstream inner wall is a cavity opening following edge, so that the cavity opening guide edge and the cavity opening following edge are both parallel to the extension shaft;
when the incoming flow is at the design point speed, the flow guide surface is parallel to the upper surface of the cavity body, the side edge with the larger height on the flow distribution surface is flush with the cavity opening guide edge of the cavity opening, the side edge with the smaller height on the flow distribution surface is flush with the upper surface of the cavity body, and the distance h between the side edge with the larger height on the flow distribution surface and the upper surface of the cavity body is (1/10-1/2) delta, wherein delta is the boundary layer thickness.
Preferably, the included angle between the flow dividing surface and the flow guide surface is 10-15 degrees.
Preferably, the stent takes the shape of a streamlined body and is subjected to a sealing treatment.
Preferably, the driving unit comprises a power device, a push rod, a pin shaft and a connecting rod, wherein the push rod is horizontally arranged and is perpendicular to the extension shaft, the power device is connected with one end of the push rod to be used for pushing the push rod to move longitudinally along the push rod, the other end of the push rod is connected with the pin shaft, one end of the connecting rod is fixedly connected to the extension shaft, a long hole is formed in the connecting rod, and the pin shaft penetrates through the connecting rod from the long hole to be used for sliding in the long hole.
Preferably, one end of the connecting rod is fixedly connected with the protruding shaft through a key.
Preferably, the flow guiding surface is perpendicular to the back flow surface.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
1) the flow splitting body inhibits the boundary layer separation of the cavity opening guide edge, destroys the formation of the cavity opening acoustic feedback ring, reduces the velocity gradient of the cavity opening shear layer, effectively inhibits the oscillation of the cavity opening shear layer and reduces the noise of the flow-induced cavity; meanwhile, the driving unit enables the shunting body to automatically adjust the posture along with the incoming flow speed according to the external flow speed, and adjusts the shunting quantity by driving the shunting body to rotate in a certain angle range, so that the effective action speed range of the shunting body is obviously enlarged, and the cavity noise control device has a stable cavity noise control effect in a larger speed range.
2) The shunt body can effectively eliminate or weaken self-sustained oscillation of the cavity, particularly line spectrum noise, has a simple structure, can be directly installed at the hole opening part of the underwater vehicle, and is flexible to install.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic cross-sectional view of the present invention;
FIG. 3 is a schematic diagram of the working principle of the present invention;
fig. 4 is a schematic view of a drive unit in the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1 to 4, a noise control device for an underwater flow cavity comprises a bracket 2, a driving unit 3 and a flow dividing body 1, wherein,
the support 2 is arranged on the upper surface 5.4 of the hollow cavity body 5, the upper surface 5.4 of the hollow cavity body 5 is provided with a cavity opening communicated with the inner cavity 5.5 of the hollow cavity body 5, and the driving unit 3 is arranged in the support 2 in a sealing way; the stent 2 of the present invention is preferably provided in two and symmetrically arranged at both sides of the orifice.
The bracket 2 is provided with the flow divider 1 at a position corresponding to the orifice, the flow divider 1 comprises a right triangular prism 1.1 and an extension shaft 1.2 arranged on the right triangular prism 1.1, the right triangular prism 1.1 is provided with two bottom surfaces which are parallel to each other, three side surfaces and three side edges which are positioned between the two bottom surfaces, the extension shaft 1.2 is arranged on at least one bottom surface, preferably, the extension shaft 1.2 is arranged on each bottom surface, the extension shaft 1.2 is horizontally arranged and is vertical to the horizontal incoming flow direction, and the side edge of the right triangular prism 1.1 is parallel to the extension shaft 1.2.
Three side surfaces of the right triangular prism 1.1 are respectively a diversion surface 1.6 facing the incoming flow and facing the hollow cavity 5, a back flow surface facing away from the incoming flow and a diversion surface 1.7 connecting the diversion surface 1.6 and the back flow surface, preferably, the diversion surface 1.7 is perpendicular to the back flow surface, vortex shedding of the diversion surface 1.7 and the diversion surface 1.6 is ensured to occur at the same flow direction position, the influence on the area of the cavity opening is reduced, the diversion surface 1.6 is obliquely arranged relative to the horizontal plane, the height of the diversion surface 1.6 is gradually reduced along the direction same as the incoming flow direction, a side edge with a larger height (namely a front edge 1.3) on the diversion surface 1.6 is positioned above the cavity opening, a side edge with a smaller height (namely a lower edge 1.4) on the diversion surface 1.6, and the other side edge of the right triangular prism 1.1 is a rear edge 1.5.
The extension shaft 1.2 is connected with the driving unit 3 to drive the right triangular prism 1.1 to rotate around the axis of the extension shaft 1.2, so that the driving unit 3 adjusts the posture of the right triangular prism 1.1 according to the flow velocity of incoming current, and further adjusts the distance h between the side edge of the diversion surface 1.6 of the right triangular prism 1.1, which is far away from the upper surface 5.4 of the cavity 5, and the upper surface 5.4 of the cavity 5. The driving unit 3 is arranged inside the supports 2 on two sides of the cavity opening, can receive external flow velocity signals, and drives the shunting body 1 to rotate by corresponding angles according to the incoming flow velocity, so as to adjust the posture of the shunting body 1.
Further, the invention also comprises a sealing bearing 4, and the protruding shaft 1.2 is arranged on the bracket 2 through the sealing bearing 4. The support 2 is provided with a shaft connecting hole at one side close to the cavity opening, the other parts of the support are of a closed cover type structure, the sealing bearing 4 is arranged at the shaft connecting hole and is sleeved on the extending shafts 1.2 at the two ends of the shunting body 1, and the shunting body 1 is mounted and supported; the bracket 2 can adopt the streamline shape and is sealed, so that the complete isolation of the inside of the bracket 2 from the outside fluid is ensured, and the flow resistance is reduced; the side wall adjacent the mouth of the chamber is suitably thickened for mounting a sealed bearing 4 and supporting the shunt body 1.
Further, the upper surface 5.4 of the cavity body 5 is parallel to the incoming flow, the cavity opening is a rectangular opening, two inner walls of the cavity opening perpendicular to the incoming flow direction are respectively a cavity opening leading edge 5.1 and a cavity opening trailing edge 5.2, the upstream inner wall is a cavity opening leading edge 5.1, the downstream inner wall is a cavity opening trailing edge 5.2, and the other two inner walls of the cavity opening are cavity opening side walls 5.3.
When the incoming flow is at the design point velocity, the diversion surface 1.7 is parallel to the upper surface 5.4 of the hollow cavity 5, and the higher side edge (i.e. the front edge 1.3) of the diversion surface 1.6 is flush with the leading edge 5.1 of the cavity opening, and the lower side edge (i.e. the lower edge 1.4) of the diversion surface 1.6 is flush with the upper surface 5.4 of the cavity, and at this time, the distance h between the higher side edge (the front edge 1.3) of the diversion surface 1.6 and the upper surface 5.4 of the cavity is (1/10-1/2) δ, where δ is the boundary layer thickness, and the boundary layer thickness has a functional relationship with the incoming flow velocity.
Further, the driving unit 3 includes a power device 3.3, a push rod 3.2, a pin shaft 3.4 and a connecting rod 3.1, the push rod 3.2 is horizontally disposed and perpendicular to the extension shaft 1.2, the power device 3.3 is connected to one end of the push rod 3.2 for pushing the push rod 3.2 to move longitudinally along the push rod 3.2, the other end of the push rod 3.2 is connected to the pin shaft 3.4, one end of the connecting rod 3.1 is preferably fixedly connected to the extension shaft 1.2 through a key 3.5, the connecting rod 3.1 is provided with a long hole, and the pin shaft 3.4 penetrates through the connecting rod 3.1 from the long hole for sliding in the long hole, so as to convert the translational motion of the push rod 3.2 into the rotation of the connecting rod 3.1 and the splitter 1.
Referring to fig. 1 and 3, when the present invention is operated, the driving unit 3 adjusts the posture of the split fluid 1 according to the magnitude of the incoming flow speed U from the outside. When the incoming flow speed U is greater than the speed of the design point, the driving unit 3 drives the shunting body 1 to rotate in the direction of reducing the distance h; when the incoming flow speed U is smaller than the design point speed, the driving unit 3 drives the flow dividing body 1 to rotate in the direction of increasing the distance h, so as to ensure that the corresponding relation between the distance h and the boundary layer thickness δ is unchanged under different flow speeds.
The flow divider 1 of the invention stretches across the upper part of the front part of the cavity opening, the right triangular prism 1.1 of the flow divider gradually becomes sharp along the opposite direction of the incoming flow until the flow divider 1.6 is connected with the flow guide surface 1.7 to form a front edge 1.3, the included angle (flow dividing angle) between the flow divider surface 1.6 and the flow guide surface 1.7 can be 10-15 degrees, the fluid divided into the cavity can effectively interfere with the cavity opening shear layer, and the velocity gradient of the shear layer is reduced.
The invention carries out flow cavity noise control based on the principles of destroying the acoustic feedback ring and weakening the development of the shear layer, the flow splitting body 1 splits the fluid in part of the boundary layer from the front edge 1.3 to the inside of the cavity body 5 along the splitting surface 1.6 through the cavity opening, thereby inhibiting the boundary layer separation of the cavity opening and destroying the formation of the acoustic feedback ring on one hand, and reducing the speed gradient of the shear layer at the cavity opening and slowing down the development of the oscillation of the shear layer on the other hand. By reasonably selecting the installation height and the size of the shunt angle of the shunt body 1, the oscillation of a shearing layer of the orifice can be effectively inhibited, and the noise of the flow-induced cavity is reduced; meanwhile, the driving unit 3 adjusts the posture of the right triangular prism 1.1 of the flow divider 1 according to the incoming flow velocity (when the incoming flow velocity is higher than the design point velocity, the driving unit 3 drives the front edge 1.3 of the flow divider 1 to move towards the direction close to the upper surface 5.4 of the cavity 5, namely the distance between the front edge 1.3 and the upper surface 5.4 of the cavity 5 is smaller than the distance between the front edge 1.3 and the upper surface 5.4 of the cavity 5 when the incoming flow velocity is lower than the design point velocity, the driving unit 3 drives the front edge 1.3 of the flow divider 1 to move towards the direction far from the upper surface 5.4 of the cavity 5 when the incoming flow velocity is lower than the design point velocity, namely the distance between the front edge 1.3 and the upper surface 5.4 of the cavity 5 is larger than the distance between the front edge 1.3 and the upper surface 5.4 of the cavity 5 when the design point velocity is higher than the incoming flow velocity), so that the flow divider 1 has a stable cavity noise suppression effect in a larger incoming flow velocity.
When the embodiment works, the flow cavity noise control is carried out based on the principle of destroying the acoustic feedback ring and reducing the development of the shear layer. As shown in fig. 3, when external fluid flows through the orifice of the cavity body 5, part of the fluid in the boundary layer is shunted from the leading edge 1.3 to the inside of the cavity along the shunting surface 1.6, and the shunting body 1 inhibits the boundary layer separation of the orifice leading edge 5.1 on one hand, and destroys the formation of the orifice acoustic feedback loop; on the other hand, the fluid which is shunted into the cavity of the cavity body 5 reduces the velocity gradient of an orifice shear layer formed by the incoming flow at the rear part of the rear edge 1.5, and further slows down the development of shear layer oscillation, the combined action of the two aspects effectively inhibits the orifice shear layer oscillation which is the main source of flow-induced cavity noise. Meanwhile, the driving unit adjusts the posture of the shunt body by driving the shunt body to rotate according to the external flow velocity, so that the flow of the shunt body flowing into the cavity is changed, the device can achieve a good cavity noise control effect under different flow velocities, and the defect that the control effect of a passive control device is only limited to the working condition of a design point is overcome.
In the present invention, the terms "upstream" and "downstream" refer to the flow of the incoming flow from upstream to downstream.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. The noise control device for the underwater flow cavity is characterized by comprising a bracket, a driving unit and a shunt body, wherein,
the support is arranged on the upper surface of the cavity body, the upper surface of the cavity body is provided with a cavity opening communicated with the inner cavity of the cavity body, and the driving unit is arranged in the support in a sealing mode;
the bracket is provided with the flow divider at a position corresponding to the cavity opening, the flow divider comprises a right triangular prism and an extension shaft arranged on the right triangular prism, the right triangular prism is provided with two bottom surfaces which are parallel to each other, three side surfaces and three side edges which are positioned between the two bottom surfaces, the extension shaft is arranged on at least one bottom surface, the extension shaft is horizontally arranged and is vertical to the horizontal incoming flow direction, and the side edges of the right triangular prism are parallel to the extension shaft;
three side surfaces of the right triangular prism are respectively a diversion surface facing the incoming flow and facing the cavity body, a back flow surface deviating from the incoming flow and a flow guide surface connecting the diversion surface and the back flow surface, the height of the diversion surface is gradually reduced along the same direction as the incoming flow direction, and the side edge with larger height on the diversion surface is positioned above the cavity opening;
the extension shaft is connected with the driving unit to drive the right triangular prism to rotate around the axis of the extension shaft, so that the driving unit adjusts the distance h between the lateral edge of the diversion surface of the right triangular prism, which is far away from the upper surface of the cavity body, and the upper surface of the cavity body according to the flow rate of incoming flow.
2. The underwater flow-induced cavity noise control device of claim 1, further comprising a seal bearing, wherein the protruding shaft is mounted on the bracket through the seal bearing.
3. The underwater flow-induced cavity noise control device of claim 1, wherein the upper surface of the cavity body is parallel to the incoming flow.
4. The underwater flow-induced cavity noise control device according to claim 3, wherein the cavity opening is a rectangular opening, two inner walls of the rectangular opening perpendicular to the incoming flow direction are respectively a cavity opening leading edge and a cavity opening trailing edge, the upstream inner wall is a cavity opening leading edge, the downstream inner wall is a cavity opening trailing edge, and the cavity opening leading edge and the cavity opening trailing edge are both parallel to the extension shaft;
when the incoming flow is at the design point speed, the flow guide surface is parallel to the upper surface of the cavity body, the side edge with the larger height on the flow distribution surface is flush with the cavity opening guide edge of the cavity opening, the side edge with the smaller height on the flow distribution surface is flush with the upper surface of the cavity body, and the distance h between the side edge with the larger height on the flow distribution surface and the upper surface of the cavity body is (1/10-1/2) delta, wherein delta is the boundary layer thickness.
5. The noise control device for the underwater flow cavity according to claim 1, wherein an included angle between the flow dividing surface and the flow guide surface is 10-15 °.
6. The device of claim 1, wherein the frame is streamlined and sealed.
7. The underwater flow excited cavity noise control device according to claim 1, wherein the driving unit comprises a power device, a push rod, a pin shaft and a connecting rod, the push rod is horizontally arranged and perpendicular to the extension shaft, the power device is connected with one end of the push rod to push the push rod to move longitudinally along the push rod, the other end of the push rod is connected with the pin shaft, one end of the connecting rod is fixedly connected to the extension shaft, a long hole is formed in the connecting rod, and the pin shaft penetrates through the connecting rod from the long hole to slide in the long hole.
8. The underwater flow-induced cavity noise control device of claim 7, wherein one end of the connecting rod is fixedly connected with the protruding shaft through a key.
9. The underwater flow-induced cavity noise control device of claim 1, wherein the flow guide surface is perpendicular to the back flow surface.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112623197A (en) * | 2020-12-29 | 2021-04-09 | 中国航空工业集团公司西安飞机设计研究所 | Shunting device for cavity noise control and noise control method |
| CN113844629A (en) * | 2021-10-26 | 2021-12-28 | 中国舰船研究设计中心 | Method for suppressing vibration noise of flow shock cavity |
| CN114822464A (en) * | 2022-04-29 | 2022-07-29 | 中国空气动力研究与发展中心计算空气动力研究所 | Cavity noise suppression method adopting bulge type protrusions |
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| CN112623197A (en) * | 2020-12-29 | 2021-04-09 | 中国航空工业集团公司西安飞机设计研究所 | Shunting device for cavity noise control and noise control method |
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| CN113844629A (en) * | 2021-10-26 | 2021-12-28 | 中国舰船研究设计中心 | Method for suppressing vibration noise of flow shock cavity |
| CN113844629B (en) * | 2021-10-26 | 2023-10-20 | 中国舰船研究设计中心 | Flow excitation cavity vibration noise suppression method |
| CN114822464A (en) * | 2022-04-29 | 2022-07-29 | 中国空气动力研究与发展中心计算空气动力研究所 | Cavity noise suppression method adopting bulge type protrusions |
| CN114822464B (en) * | 2022-04-29 | 2023-04-18 | 中国空气动力研究与发展中心计算空气动力研究所 | Cavity noise suppression method adopting bulge type protrusions |
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