Device for propeller

Abstract

A device (10; 110) for a propeller (12) includes a body (18; 118), an inlet device (20; 120), and an outlet device (22; 122). The body (18; 118) is configured to be coupled to or form a portion of a hub (14) of the propeller (12). The inlet device (20; 120) is configured to receive a portion of a fluid passing outside the body (18; 118). The outlet device (22; 122) is configured to direct the fluid away from the body (18; 118). The device (10; 110) is configured to convert a flow of fluid received by the inlet device (20; 120) into an axial flow of fluid output from the device (10; 110), thereby preventing or at least mitigating formation of hub vortices downstream of the propeller (12).

Description

Technical Field

[0001] This article relates to a device for a propeller, such as a hub cap, and a propeller including the device. Background Technology

[0002] Propellers are widely used in a wide range of applications to apply power to fluids, and are perhaps most well known in the transportation industry, where they are used to generate the thrust required to propel maritime vehicles in water and / or to propel aircraft in the air.

[0003] Despite their widespread use, propellers still suffer from defects that affect their performance. For example, one phenomenon experienced by propeller-driven aircraft involves the formation of irregularly shaped cavities in the fluid behind the propeller, known as hub vortices.

[0004] Among other issues, hub eddies can cause increased vibration and / or noise, and in more extreme cases, contribute to rudder corrosion in the vehicle. Notably, hub eddies are known to generate additional drag and / or reduce propeller thrust, which can impair propeller performance. These factors can then lead to reduced prime mover output, resulting in increased fuel consumption and / or increased maintenance requirements, as well as a shortened service life for vehicles with such propellers. Summary of the Invention

[0005] This disclosure relates to a device for a propeller, such as a hub cap, and a propeller including the device.

[0006] According to a first aspect, an apparatus for a propeller is provided, the apparatus comprising:

[0007] The main body, which is configured to be connected to the hub of the propeller or form part of it;

[0008] An inlet device configured to receive a portion of the fluid passing through the exterior of the body;

[0009] An outlet device, configured to guide fluid away from the body.

[0010] The device is configured to convert the fluid flow received by the inlet device into an axial fluid flow output from the device, thereby preventing or at least mitigating the formation of hub vortices downstream of the propeller.

[0011] In use, the device is attached to or forms part of the propeller hub and is operable to deliver a portion of the fluid flow passing through the body to the outlet device, whereby the fluid flow is output as an axial fluid flow and leaves the device.

[0012] This device offers numerous benefits. For example, it directs the high-pressure flow downstream of the propeller to the core of the hub vortex, where the pressure would otherwise be very low, thus delaying cavitation downstream of the hub. The device also increases the flow pressure at the hub vortex core, thereby suppressing the development of the hub vortex.

[0013] Among other things, this device can thus mitigate vibrations, noise, and / or drag associated with the formation of hub vortices, and consequently contribute to increased operational efficiency and structural integrity, reduced maintenance requirements, extended service life, and / or reduced fuel consumption. For example, delaying the occurrence of propeller hub vortex cavitation reduces and / or mitigates corrosion of any associated rudders on propeller-driven vessels, among other things. Given that propeller-driven vessels, such as container ships, form a critical part of the global trade infrastructure, this improved performance is also seen as a significant factor in maintaining the efficiency and security of the world's supply chains while reducing environmental impact.

[0014] As described above, the device includes a body configured to be coupled to or form part of the hub of a propeller.

[0015] In a specific embodiment, the device may be configured to be coupled to the hub of a propeller.

[0016] The device may include a propeller hub cap or take the form of a propeller hub cap.

[0017] The device can be configured to be directly connected to the propeller hub.

[0018] Alternatively, the device can be configured to be indirectly coupled to the propeller hub. For example, the device can be configured to be coupled to an existing hub cap.

[0019] When the device is configured to be connected to the propeller hub or an existing hub cap, the device may include a coupling device.

[0020] The coupling device can be configured and / or operable to secure the body to the propeller hub or an existing hub cap.

[0021] The coupling device can take any suitable form. For example, the coupling device may include or take the form of a fastener arrangement. The fastener arrangement may include one or more fasteners, such as bolts. Alternatively, the coupling device may include a threaded connection, a push-fit connection, a welded connection, an adhesive bond, or other suitable connection.

[0022] As noted above, the body can alternatively form part of the propeller hub. For example, the body can be integrally formed with the propeller hub.

[0023] Advantageously, the device can be used as a retrofit device for connecting to an existing propeller or hub cap, or as a device that is connected to the propeller or forms part of the propeller during its construction.

[0024] The main body can take various shapes and / or forms. In a specific embodiment, the main body can be conical, truncated conical, or dome-shaped.

[0025] The main body may include a first proximal main body portion.

[0026] The first main body can be connected to the propeller hub or form part of it.

[0027] In a specific embodiment, the first main body portion may be truncated conical in shape.

[0028] Alternatively, the first main body may be cylindrical or substantially cylindrical in shape.

[0029] The main body may include a second distal main body portion.

[0030] The second main body portion can be conical or dome-shaped. In a specific embodiment, the second main body portion may include a flat dome shape or take the form of a flat dome shape.

[0031] The first main body and the second main body can be formed as a single unit.

[0032] Alternatively, the first and second main body parts can be in the form of separate components.

[0033] The main body may include a central longitudinal axis or be arranged around a central longitudinal axis.

[0034] As described above, the device includes an inlet device configured to receive a portion of the fluid passing through the exterior of the body.

[0035] The entry device may be formed or otherwise provided in the body.

[0036] The inlet device may be formed or otherwise provided in the first proximal body portion.

[0037] The entry device may include one or more inlets or take the form of one or more inlets.

[0038] In a specific embodiment, the entry device may include multiple entry points. These entry points may be arranged circumferentially. These entry points may be circumferentially spaced apart.

[0039] At least one of the inlets may extend in the axial direction. At least one of the inlets may alternatively or additionally extend in the circumferential direction.

[0040] One or more of the entrances may include channels or take the form of channels.

[0041] One or more passages in the entrance can be straight.

[0042] One or more channels in the entrance can be curved. For example, one or more channels in the entrance can be spiral-shaped.

[0043] The device can be configured such that the number of inlets controls the interaction between the inlet device and the propeller blades.

[0044] More specifically, the number of inlets can be selected to suppress vortex development at the root of each propeller blade and / or minimize the total pressure loss through the device.

[0045] The number of inlets can be selected to suppress vortex development downstream of the propeller hub.

[0046] The number of inlets can be selected based on the number of blades. For example, the number of inlets can be twice the number of blades. In a specific embodiment, the number of inlets can be three times the number of blades.

[0047] Benefically, configuring the number of inlets to control the interaction between the inlet device and the propeller blades can help with flow dynamics control and / or mitigate adverse effects on propeller performance.

[0048] The inlet device may include 2 to 18 inlets.

[0049] In a specific embodiment, the inlet device may include eight inlets.

[0050] In a specific embodiment, the inlet device may include eight inlets, each extending in both the axial and circumferential directions.

[0051] In a specific embodiment, the inlet device may include 6 to 18 inlets.

[0052] The location of the inlet can be configured to control the interaction between the inlet device and the propeller blades.

[0053] The device can be configured such that at least one of the inlets is positioned to capture the root vortex of the blade.

[0054] At least one of the inlets can be positioned after the root slip flow of one of the blades, for example, immediately following it.

[0055] At least one of the inlets can be positioned to be aligned or substantially aligned with the root pitch of each propeller blade.

[0056] Advantageously, the inlet can act as a pressure relief outlet, allowing the vortices in the blades to be managed, thereby minimizing or at least mitigating the negative impact on propeller performance.

[0057] As described above, at least one of the inlets may extend in both the axial and circumferential directions.

[0058] At least one entrance may be angled relative to the central longitudinal axis of the body. Multiple entrances, in a specific embodiment, may be angled relative to the central longitudinal axis of the body.

[0059] At least one inlet may be angled relative to the central longitudinal axis of the body in the axial and / or circumferential directions. Multiple inlets, in a specific embodiment, may be angled relative to the central longitudinal axis of the body in the axial and / or circumferential directions.

[0060] The main body of the device may define a horizontal plane. The main body of the device may define a vertical plane. The vertical plane may be transverse to the horizontal plane. The central longitudinal axis of the main body may be transverse to the vertical plane.

[0061] At least one of the entrances may be angled relative to the horizontal plane. In a specific embodiment, all of the multiple entrances may be angled relative to the horizontal plane.

[0062] At least one of the entrances may be angled relative to a vertical plane. In a specific embodiment, all of the multiple entrances may be angled relative to a vertical plane.

[0063] At least one of the inlets may define an acute angle in the axial direction relative to the central longitudinal axis of the body. This acute angle may be greater than 70 degrees. This acute angle may be less than 60 degrees. In a specific embodiment, the acute angle may be 35 degrees.

[0064] The angle of the inlet can be configured to minimize or at least reduce pressure loss within the inlet.

[0065] Advantageously, the inlet angle can be configured to minimize or at least reduce pressure loss within the inlet, taking into account the propeller's operating conditions and blade pitch.

[0066] In use, the inlet angle generates swirling flow in the fluid flow.

[0067] Beneficially, this contributes to the suppression of the development of hub vortices.

[0068] At least one of the inlets may include an inlet port or take the form of an inlet port.

[0069] At least one of the inlet ports is a defined inlet port.

[0070] The entrance port can be angled, meaning it can be angled relative to the central longitudinal axis of the body. For example, the entrance port can be defined at an acute angle relative to the central longitudinal axis of the body.

[0071] Advantageously, providing angled inlet ports can help capture / introduce fluid passing outside the body with minimal disturbance to fluid flow passing outside the body.

[0072] At least one of the inlet ports can be circular or substantially circular.

[0073] An inlet may include an outlet port. An outlet port may define the discharge port of the inlet.

[0074] In cases where the inlet device includes multiple inlets, two or more of the inlets may have the same size, such as diameter.

[0075] Alternatively, in cases where the inlet device comprises multiple inlets, two or more of the inlets may have different dimensions, such as diameter.

[0076] The inlet and outlet ports can be the same or substantially the same size, such as diameter.

[0077] Alternatively, one or more inlet ports and outlet ports in the inlet may have different dimensions, such as diameter.

[0078] The inlet and outlet ports can be the same or substantially the same shape.

[0079] Alternatively, one or more inlet ports and outlet ports in the inlet may have different shapes.

[0080] As described above, the device includes an outlet device configured to direct fluid away from the device.

[0081] In a specific embodiment, the device may include a coupling portion. The coupling portion may be formed in the body of the device. The coupling portion may be formed in a first proximal body portion.

[0082] The connecting part can be centered on the central longitudinal axis of the main body.

[0083] The connecting portion may include a truncated conical segment. The truncated conical segment may include sidewalls. The truncated conical segment may be oriented in a plane perpendicular to or substantially perpendicular to the central longitudinal axis of the body. The sidewalls of the truncated conical segment may be angled. The sidewalls of the truncated conical segment may converge toward the second distal body portion.

[0084] The connecting portion may include cylindrical or substantially cylindrical sections. These cylindrical or substantially cylindrical sections may include sidewalls. The cylindrical or substantially cylindrical sections may be oriented in a plane perpendicular to or substantially perpendicular to the central longitudinal axis of the body. The sidewalls of the cylindrical or substantially cylindrical sections may be straight or substantially straight. The sidewalls of the cylindrical or substantially cylindrical sections may extend parallel to or substantially parallel to the central longitudinal axis of the body.

[0085] In use, the connecting part is configured to receive the propeller hub or an existing hub cap therein, thereby facilitating the connection of the device to the propeller hub or an existing hub cap.

[0086] The inlet device may overlap with the truncated conical section and / or cylindrical or substantially cylindrical section of the connecting portion.

[0087] Advantageously, this reduces the overall length of the device body and thus its weight. It can be recognized that any reduction in device weight has significant subsequent benefits in increasing operational efficiency and / or reducing fuel consumption.

[0088] The export device may be formed or otherwise provided within the second main body.

[0089] Exporting devices may include exporting.

[0090] The outlet can be circular or roughly circular.

[0091] The outlet can be set around the central longitudinal axis of the main body.

[0092] The outlet can be centered on the longitudinal axis.

[0093] The outlet can be oriented in a plane that is perpendicular or substantially perpendicular to the central longitudinal axis of the main body.

[0094] In use, the outlet can be configured to guide fluid in the axial direction, for example, the fluid flow output can be aligned, substantially aligned and / or parallel to the central longitudinal axis of the body, thereby guiding the high-pressure flow to the core of the hub vortex and thus suppressing the development of the hub vortex.

[0095] The outlet device may include a cavity.

[0096] The cavity may be formed or otherwise disposed within the body.

[0097] The cavity may be formed or otherwise disposed in the second distal body portion.

[0098] The cavity can extend from the outlet toward the first proximal body portion.

[0099] The cavity can be set around the central longitudinal axis of the main body.

[0100] The cavity can be centered on the central longitudinal axis.

[0101] The cavity may include a base.

[0102] The base can be circular or roughly circular.

[0103] The base can be flat or substantially flat.

[0104] The base can be oriented on a plane that is perpendicular or substantially perpendicular to the central longitudinal axis of the body.

[0105] The cavity may include one or more sidewalls.

[0106] In a specific embodiment, the cavity may include a single annular or generally annular wall surrounding the base. The sidewalls, or at least one of them (in embodiments including multiple sidewalls), may be angled. Specifically, the sidewalls of the cavity may converge toward the outlet. The cavity may be truncated conical.

[0107] The cavity can define or function as a manifold. The cavity can communicate with multiple, specifically all, inlets.

[0108] The cavity can be molded to minimize or at least reduce pressure loss within the cavity.

[0109] The shrinkage ratio, i.e. the area of ​​the base relative to the outlet, and / or the length and / or angle of the cavity wall, can be configured to minimize or at least reduce the pressure loss within the cavity.

[0110] The shrinkage ratio can be selected based on the structure of the hub vortex and / or its interaction with the rudder.

[0111] The walls of the cavity can be straight.

[0112] Alternatively, the walls of the cavity may include or define a curved shape, such as an S-shape.

[0113] Benefically, this can optimize or at least improve the flow dynamics within the cavity, reduce pressure loss, and / or improve overall propeller performance.

[0114] According to the second aspect, a propeller comprising the device of the first aspect is provided.

[0115] A propeller may include a hub.

[0116] A propeller may include multiple blades.

[0117] According to the third aspect, a means of transportation comprising one or more propellers according to the second aspect is provided.

[0118] The means of transport may include taking the form of maritime carriers, such as ships or boats.

[0119] Transportation may include taking the form of an airplane.

[0120] According to the fourth aspect, a method is provided that uses the means of the first aspect to prevent or at least mitigate the formation of hub vortices downstream of the propeller.

[0121] This method can delay the occurrence of cavitation downstream of the propeller hub.

[0122] This invention is defined by the appended claims. However, for the purposes of this disclosure, it should be understood that any feature defined above or described below may be used alone or in combination. For example, a feature described above with respect to one of the above aspects or below with respect to the following detailed description may be used in any other aspect or together to form a new aspect. Attached Figure Description

[0123] These and other aspects will now be described by way of example only, with reference to the accompanying drawings, in which:

[0124] Figure 1 A perspective view of the device used for the propeller is shown;

[0125] Figure 2 It shows Figure 1 Cross-sectional view of the device shown;

[0126] Figure 3 It shows Figure 1 Side view of the device shown;

[0127] Figure 4 It shows Figure 1 End view of the device shown;

[0128] Figure 5 A perspective view of an alternative device for the propeller is shown;

[0129] Figure 6 It shows Figure 5 An enlarged view of a portion of the device shown;

[0130] Figure 7 A perspective view of an alternative device for the propeller is shown;

[0131] Figure 8 It shows Figure 7 Additional perspective view of the device shown;

[0132] Figure 9 It shows Figure 7 End view of the device shown;

[0133] Figure 10 It shows Figure 7 Side view of the device shown;

[0134] Figure 11 It shows Figure 7 A cross-sectional view of the device along line BB; and

[0135] Figure 12 It shows Figure 7 The diagram shows a cross-sectional view of the device along line AA. Detailed Implementation

[0136] First, please refer to the attached diagram. Figures 1 to 4 The image shows a device for a propeller 12, generally designated 10, which has a hub 14 and multiple blades 16.

[0137] like Figure 1 As shown, the device 10 includes a body 18 configured to be coupled to or form part of a hub 14 of a propeller 12. The device 10 also includes an inlet device (generally designated 20) and an outlet device (generally designated 22), the inlet device being configured to receive a portion of fluid passing outside the body 18, and the outlet device being configured to guide the fluid out of the body 18.

[0138] In use, the device 10 is coupled to or forms part of the hub 14 of the propeller 12 and is operable to deliver a portion of a fluid flow passing outside the device 10 through the body 18 to the outlet device 22, whereby the fluid flow exits the device 10 as an axial fluid flow. As will be further described below, the device 10 is configured to convert the fluid flow received at the inlet device 20 into an axial fluid flow output aligned with the central longitudinal axis 24 of the body 18, thereby preventing or at least mitigating the formation of hub vortices downstream of the propeller 12.

[0139] Device 10 provides several benefits. For example, it directs the high-pressure flow downstream of propeller 12 to the core of the hub vortex, where the pressure would otherwise be very low, thus delaying cavitation downstream of hub 14. Device 10 increases the flow pressure at the hub vortex core, thereby suppressing the development of the hub vortex.

[0140] Among other things, device 10 mitigates vibration, noise, and / or drag associated with the formation of hub vortices, and consequently contributes to increased operational efficiency and structural integrity, reduced maintenance requirements, extended service life, and / or reduced fuel consumption. For example, delaying the occurrence of propeller hub vortex cavitation reduces and / or mitigates corrosion of any associated rudders on propeller-driven vessels, among other things. Given that propeller-driven vessels, such as container ships, form a critical part of the global trade infrastructure, this improved performance is also considered a significant factor in maintaining the efficiency and security of the world's supply chains while reducing environmental impact.

[0141] As described above, the device 10 includes a body 18 which is configured to be coupled to or form part of the hub 14 of the propeller 12.

[0142] In the illustrated device 10, the device 10 is configured to be connected to the hub 14 of the propeller 12 and takes the form of a propeller hub cap.

[0143] The device 10 includes a coupling device (generally designated 26) configured and / or operable to secure the body 18 to the hub 14 of the propeller 12.

[0144] In device 10, the connecting device 26 includes or takes the form of a fastener arrangement, which includes fasteners in the form of bolts 28.

[0145] However, it should be understood that the connecting device 26 may take any suitable form and may alternatively or additionally include threaded connections, push-fit connections, welded connections, adhesive bonding or other suitable connections.

[0146] Advantageously, the device 10 can be used as a retrofit device for connecting to an existing propeller 12, or as a device that connects to the propeller during propeller operation or forms part of the propeller as a whole.

[0147] As shown in the figure, the main body 18 includes a first proximal main body portion 30 and a second distal main body portion 32. The first main body portion 30 is connected to the hub 14 of the propeller 12. In the illustrated device 10, the first main body portion 30 is truncated conical in shape, and the second main body portion 32 is in the form of a flat dome shape.

[0148] As described above, the device 10 includes an inlet device 20 configured to receive a portion of the fluid passing through the exterior of the body 18.

[0149] An inlet device 20 is formed in the main body 18, more specifically in the first proximal main body portion 30, and includes a plurality of circumferentially arranged and spaced-apart inlets 34.

[0150] As shown in the figure, the inlet 34 extends in the axial and circumferential directions and includes an inlet port 36 forming a fluid intake port, an outlet port 38 forming a fluid discharge port, and a channel 40 connecting the fluid from the inlet port 36 to the outlet port 38.

[0151] The inlet port 36 is angled, that is, the inlet port 36 is angled relative to the central longitudinal axis 24 of the main body 18.

[0152] Advantageously, providing an angled inlet port 36 helps to capture / introduce fluid passing outside the body 18 with minimal disturbance to fluid flow passing outside the body 18.

[0153] In the illustrated device 10, the channel 40 is straight.

[0154] In the illustrated device 10, the number of inlets 34 is configured to control the interaction between the inlet device 20 and the blades 16 of the propeller 12.

[0155] The number of inlets 34 is configured to suppress vortex development at the root 50 of each blade 16 of the propeller 12 and downstream of the hub 14 of the propeller 12.

[0156] Advantageously, configuring the number of inlets 34 to control the interaction between the inlet device 20 and the blades 16 of the propeller 12 can contribute to flow dynamics control and / or mitigate adverse effects on the performance of the propeller 12. For example, configuring the number of inlets 34 as discussed above can operate to minimize the total pressure loss of the entire device 10.

[0157] As shown in the figure, in the illustrated device 10, the inlet device 20 includes eight inlets 34, each of which extends along the axial direction and the circumferential direction.

[0158] In the illustrated device 10, the position of the inlet 34 is configured to control the interaction between the inlet device 20 and the blades 16 of the propeller 12.

[0159] Specifically, inlet 34 is positioned to capture the root vortex of blade 16.

[0160] Advantageously, inlet 34 acts as a pressure relief outlet, which minimizes the pressure loss of the entire device 10 and allows the vortex of blade 16 to be managed, thereby minimizing or at least mitigating the negative impact on propeller performance.

[0161] In the illustrated device 10, the angle of the inlet 34 is configured to minimize or at least reduce the pressure loss within the inlet 34.

[0162] Advantageously, the angle of inlet 34 can be configured to minimize or at least reduce pressure loss within the inlet, taking into account the operating conditions of propeller 12 and blade pitch.

[0163] In use, the angle of inlet 34 generates swirling flow in the fluid flow.

[0164] Beneficially, this contributes to the suppression of hub vortex development.

[0165] In the illustrated device 10, the inlet port 36 and the outlet port 38 have the same or substantially the same diameter.

[0166] As described above, device 10 includes an outlet device 22 configured to direct fluid out of device 10.

[0167] In the illustrated device 10, the outlet device 22 is formed within the second distal main body portion 32.

[0168] The outlet device 22 includes an outlet 42 and a cavity 44. The outlet 42 is circular or substantially circular. The outlet 42 is centered on the central longitudinal axis 24 of the main body 18 and is oriented in a plane that is perpendicular to or substantially perpendicular to the central longitudinal axis 24 of the main body 18.

[0169] In use, outlet 42 is configured to guide fluid in the axial direction. For example, the fluid flow output can be aligned, substantially aligned and / or parallel to the central longitudinal axis 24 of the body 18, thereby guiding the high-pressure flow to the hub vortex core and thus suppressing the development of the hub vortex.

[0170] Cavity 44 is formed in the main body 18, and more specifically in the second distal main body portion 32.

[0171] Cavity 44 extends from outlet 42 toward the first proximal body portion 30.

[0172] The cavity 44 is centered on the longitudinal axis 24 of the main body 18.

[0173] As shown in the figure, the cavity 44 is a truncated cone shape, including a base 46 and sidewalls 48. In the illustrated device 10, the base 46 is circular or substantially circular, and is flat or substantially flat. Furthermore, the base 46 is oriented in a plane perpendicular to or substantially perpendicular to the central longitudinal axis 24 of the body 18. The sidewalls 48 are angled and converge from the base 46 toward the outlet 42.

[0174] In use, cavity 44 defines or functions as a manifold that connects fluid from inlet to outlet 42.

[0175] The cavity 44 is shaped to minimize or at least reduce the pressure loss within the cavity 44.

[0176] In the illustrated device 10, the sidewall 48 of the cavity 44 is flat.

[0177] It should be understood that various modifications can be made without departing from the scope of the claimed invention.

[0178] For example, the attached diagram Figure 5 and Figure 6 An alternative device for propeller 12 (generally designated 110) is shown. Device 110 is similar to device 10 described above, and similar parts are indicated by similar reference numerals.

[0179] As shown, the device 110 includes a body 118 configured to be coupled to or form part of the hub 14 of the propeller 12. The device 110 also includes an inlet device (generally designated 120) and an outlet device (generally designated 122), the inlet device being configured to receive a portion of the fluid passing through the exterior of the body 118, and the outlet device being configured to guide the fluid out of the body 118.

[0180] In use, the device 110 is coupled to or forms part of the hub 114 of the propeller 112 and is operable to deliver a portion of a fluid flow passing outside the device 110 through the body 118 to the outlet device 122, whereby the fluid flow exits the device 110 as an axial fluid flow. As will be further described below, the device 110 is configured to convert the fluid flow received at the inlet device 120 into an axial fluid flow output aligned with the central longitudinal axis 124 of the body 118, in order to prevent or at least mitigate the formation of hub vortices downstream of the propeller 12.

[0181] Like device 10, device 110 offers several benefits. For example, device 110 directs the high-pressure flow downstream of propeller 12 to the core of the hub vortex, where the pressure would otherwise be very low, thus delaying cavitation downstream of the hub 14. Device 110 increases the flow pressure at the core of the hub vortex, thereby suppressing the development of the hub vortex.

[0182] Among other things, device 110 mitigates vibration, noise, and / or drag associated with the formation of hub vortices, and consequently contributes to increased operational efficiency and structural integrity, reduced maintenance requirements, extended service life, and / or reduced fuel consumption. For example, delaying the occurrence of propeller hub vortex cavitation reduces and / or mitigates corrosion of any associated rudders on propeller-driven vessels, among other things. Given that propeller-driven vessels, such as container ships, form a critical part of the global trade infrastructure, this improved performance is also considered a significant factor in maintaining the efficiency and security of the world's supply chains while reducing environmental impact.

[0183] like Figure 6 As shown, the difference between device 110 and device 10 is that the sidewall 148 of cavity 144 may include or define a curved shape, more specifically an S-shape.

[0184] Benefically, this can optimize or at least improve the flow dynamics within the cavity, reduce pressure loss, and / or improve overall propeller performance.

[0185] The attached diagram Figures 7 to 12An alternative device for propeller 12 (generally designated 210) is shown. Device 210 is similar to devices 10 and 110 described above, and similar parts are indicated by similar reference numerals.

[0186] like Figure 1 As shown, the device 210 includes a body 218 configured to be coupled to or form part of the hub 14 of the propeller 12. The device 210 also includes an inlet device (generally designated 220) and an outlet device (generally designated 222), the inlet device being configured to receive a portion of the fluid passing through the exterior of the body 218, and the outlet device being configured to guide the fluid out of the body 218.

[0187] In use, the device 210 is coupled to or forms part of the hub 14 of the propeller 12 and is operable to deliver a portion of the fluid flow passing outside the device 210 through the body 218 to the outlet device 222, whereby the fluid flow is output as an axial fluid flow from the device 210. As will be further described below, the device 210 is configured to convert the fluid flow received at the inlet device 220 into an axial fluid flow output aligned with the central longitudinal axis 224 of the body 218, thereby preventing or at least mitigating the formation of hub vortices downstream of the propeller 12.

[0188] Device 210 provides several benefits. For example, it directs the high-pressure flow downstream of propeller 12 to the core of the hub vortex, where the pressure would otherwise be very low, thus delaying cavitation downstream of hub 14. Device 210 increases the flow pressure at the hub vortex core, thereby suppressing the development of the hub vortex.

[0189] Among other things, device 210 mitigates vibration, noise, and / or drag associated with the formation of hub vortices, and consequently contributes to increased operational efficiency and structural integrity, reduced maintenance requirements, extended service life, and / or reduced fuel consumption. For example, delaying the occurrence of propeller hub vortex cavitation reduces and / or mitigates corrosion of any associated rudders on propeller-driven vessels, among other things. Given that propeller-driven vessels, such as container ships, form a critical part of the global trade infrastructure, this improved performance is also seen as a significant factor in maintaining the efficiency and security of the world's supply chains while reducing environmental impact.

[0190] As described above, the device 210 includes a body 218 which is configured to be coupled to or form part of the hub 14 of the propeller 12.

[0191] In the illustrated device 210, the device 210 is configured to be connected to the hub 14 of the propeller 12 and takes the form of a propeller hub cap.

[0192] The device 210 includes a coupling device 226 configured and / or operable to secure the body 218 to the hub 14 of the propeller 12.

[0193] In device 210, the connecting device 226 includes or takes the form of a fastener arrangement, which includes fasteners in the form of bolts 228.

[0194] However, it should be understood that the connecting device 226 may take any suitable form and may alternatively or additionally include threaded connections, push-fit connections, welded connections, adhesive bonding or other suitable connections.

[0195] Advantageously, the device 210 can be used as a retrofit device for connecting to an existing propeller 12, or as a device that connects to the propeller during propeller operation or forms part of the propeller as a whole.

[0196] As shown in the figure, the main body 218 includes a first proximal main body portion 230 and a second distal main body portion 232. The first main body portion 230 is connected to the hub 14 of the propeller 12. In the illustrated device 210, the first main body portion 230 is truncated conical in shape, and the second main body portion 232 is in the form of a flat dome shape.

[0197] The body 218 includes a flange portion 252, wherein the flange portion 252 includes an aperture 254 formed therethrough. At least one aperture 254 is configured to receive a bolt 228 passing through it.

[0198] The device 210 includes a plurality of circumferentially arranged and spaced ribs 256 inserted between the flange portion 252 and the first body portion 230.

[0199] As described above, device 210 includes inlet device 220, which is configured to receive a portion of the fluid passing through the exterior of body 218.

[0200] Now for reference Figure 11 and Figure 12 An inlet device 220 is formed in the main body 218, more specifically in the first proximal main body portion 230, and includes a plurality of circumferentially arranged and spaced-apart inlets (generally designated 234).

[0201] As shown in the figure, the inlet 234 extends in the axial and circumferential directions and includes an inlet port 236 forming a fluid intake port, an outlet port 238 forming a fluid discharge port, and a channel 240 connecting the fluid from the inlet port 236 to the outlet port 238.

[0202] The inlet port 236 is angled, that is, the inlet port 236 is angled relative to the central longitudinal axis 224 of the main body 218.

[0203] Advantageously, providing an angled inlet port 236 helps to capture / introduce fluid passing outside the body 218 with minimal disturbance to fluid flow passing outside the body 218.

[0204] In the illustrated device 210, the channel 240 is straight.

[0205] In the illustrated device 210, the number of inlets 234 is configured to control the interaction between the inlet device 220 and the blades 16 of the propeller 12.

[0206] The number of inlets 234 is configured to suppress vortex development at the root 50 of each blade 16 of the propeller 12 and downstream of the hub 14 of the propeller 12.

[0207] Advantageously, configuring the number of inlets 234 to control the interaction between the inlet device 220 and the blades 16 of the propeller 12 can contribute to flow dynamics control and / or mitigate adverse effects on the performance of the propeller 12. For example, configuring the number of inlets 234 as discussed above can operate to minimize the total pressure loss of the entire device 210.

[0208] As shown in the figure, in the illustrated device 210, the inlet device 220 includes inlets 234, each inlet extending in the axial direction and the circumferential direction.

[0209] In the illustrated device 210, the position of the inlet 234 is configured to control the interaction between the inlet device 220 and the blades 16 of the propeller 12.

[0210] Specifically, inlet 234 is positioned to capture the root vortex of blade 16.

[0211] Advantageously, inlet 234 acts as a pressure relief outlet, which minimizes the pressure loss of the entire device 210 and allows the vortex of blade 16 to be managed, thereby minimizing or at least mitigating the negative impact on propeller performance.

[0212] In the illustrated device 210, the inlet 234 is at an angle of 35 degrees relative to the central longitudinal axis 224 of the main body 218 in the axial direction.

[0213] Advantageously, the angle of inlet 234 is configured to minimize or at least reduce pressure loss within the inlet, taking into account the operating conditions of propeller 12 and blade pitch.

[0214] In use, the angle of inlet 234 generates a vortex in the fluid flow.

[0215] Beneficially, this contributes to the suppression of hub vortex development.

[0216] In the illustrated device 210, the inlet port 236 and the outlet port 238 have the same or substantially the same diameter.

[0217] The device 210 includes a connecting portion 258 formed in the body 218, and more specifically in the first proximal body portion 230.

[0218] The connecting part 258 is centered on the longitudinal axis 224 of the main body 218.

[0219] As shown in the figure, the connecting portion 258 includes a truncated conical section 260, which includes sidewalls 262. In the illustrated device 210, the truncated conical section 260 is oriented in a plane perpendicular to or substantially perpendicular to the central longitudinal axis 224 of the main body 218. The sidewalls 262 are angled and converge toward the second distal main body portion 232.

[0220] The connecting portion 258 includes a cylindrical or generally cylindrical segment 264, which includes a sidewall 266. In the illustrated device 210, the cylindrical or generally cylindrical segment 264 is oriented in a plane perpendicular to or substantially perpendicular to the central longitudinal axis 224 of the body 218. The sidewall 266 is straight or substantially straight and extends parallel to or substantially parallel to the central longitudinal axis 224 of the body 218.

[0221] In use, the connection portion 258 is configured to receive the hub 14 of the propeller 12 or an existing hub cap therein, thereby facilitating the connection of the device 218 to the hub 14 of the propeller 12 or an existing hub cap.

[0222] In the illustrated embodiment, the inlet device 220 overlaps with the truncated conical section 260 and the cylindrical or substantially cylindrical section 264 of the connecting portion 258.

[0223] Advantageously, this reduces the overall length of the body 218 of device 210 and reduces the weight of device 210. It can be recognized that any reduction in the weight of device 210 has significant subsequent benefits in increasing operational efficiency and / or reducing fuel consumption.

[0224] As described above, device 210 includes an outlet device 222 configured to direct fluid out of device 210.

[0225] In the illustrated device 210, the outlet device 222 is formed within the second distal main body portion 232.

[0226] The outlet device 222 includes an outlet 242 and a cavity 244. The outlet 242 is circular or substantially circular. The outlet 242 is centered on the central longitudinal axis 224 of the main body 218 and is oriented in a plane that is perpendicular to or substantially perpendicular to the central longitudinal axis 224 of the main body 218.

[0227] In use, outlet 242 is configured to guide fluid in the axial direction, for example, the fluid flow output can be aligned, substantially aligned and / or parallel to the central longitudinal axis 224 of body 218, thereby guiding the high-pressure flow to the core of the hub vortex and thus suppressing the development of the hub vortex.

[0228] Cavity 244 is formed in body 218.

[0229] Cavity 244 extends from outlet 242 toward the first proximal body portion 230.

[0230] The cavity 244 is centered on the longitudinal axis 224 of the main body 218.

[0231] As shown in the figure, the cavity 244 is a truncated cone shape, including a base 246 and sidewalls 248. In the illustrated device 210, the base 246 is circular or substantially circular and is flat or substantially flat. Furthermore, the base 246 is oriented in a plane perpendicular to or substantially perpendicular to the central longitudinal axis 224 of the body 218. The sidewalls 248 are angled and converge from the base 246 toward the outlet 242.

[0232] In use, cavity 244 defines or serves as a manifold that connects fluid from inlet to outlet 242.

[0233] The cavity 244 is shaped to minimize or at least reduce the pressure loss within the cavity 244.

[0234] In the illustrated device 210, the sidewall 248 of the cavity 244 is flat.

[0235] Various other modifications can be made.

[0236] For example, one or more channels in the entrance can be curved. For example, one or more channels in the entrance can be spiral-shaped.

[0237] Alternatively, one or more inlet ports and outlet ports in the inlet may have different dimensions, such as diameter.

Claims

1. A device for a propeller, the device comprising: The main body is configured to be attached to or form part of the hub of the propeller; An inlet device configured to receive a portion of the fluid passing through the exterior of the body; An outlet device configured to direct the fluid away from the body. The device is configured to convert the fluid flow received by the inlet device into an axial fluid flow output from the device, thereby preventing or at least mitigating the formation of hub vortices downstream of the propeller.

2. The apparatus according to claim 1, wherein, The device includes or takes the form of a propeller hub cap.

3. The apparatus according to claim 1 or 2, wherein, The device is configured to be directly connected to the hub of the propeller.

4. The apparatus according to claim 1 or 2, wherein, The device is configured to be indirectly connected to the hub of the propeller.

5. The apparatus according to claim 4, wherein, The device is configured to be attached to an existing propeller hub cap.

6. The apparatus according to any one of the preceding claims, wherein, The device includes a coupling device configured and / or operable to secure the body to the propeller hub or the existing hub cap.

7. The apparatus according to any one of the preceding claims, wherein, The main body is conical, truncated conical, or dome-shaped.

8. The apparatus according to any one of the preceding claims, wherein, The inlet device includes one or more inlets.

9. The apparatus according to claim 8, wherein, The entrances are arranged circumferentially and / or spaced apart.

10. The apparatus according to claim 8 or 9, wherein, At least one of the inlets extends in the following directions: Axial direction; and / or Circumferential direction.

11. The apparatus according to any one of claims 8 to 10, wherein, The device includes at least one of the following features: The number of inlets is selected to suppress the development of vortices at the root of one or more of the blades of the propeller; The number of inlets is selected to suppress the development of downstream vortices at the hub of the propeller; The number of inlets was chosen to minimize the total pressure loss through the device; and The number of inlets is selected based on the number of blades.

12. The apparatus according to any one of claims 8 to 11, wherein, The device includes at least one of the following features: At least one of the inlets is located after, for example immediately following, the slip flow at the root of one of the blades; At least one of the inlets is positioned in pitch alignment or substantially alignment with the root of one of the blades.

13. The apparatus according to any one of claims 8 to 12, wherein, At least one of the inlets is at an angle relative to the central longitudinal axis of the body.

14. The apparatus according to claim 13, wherein, At least one of the inlets defines an angle of 35 degrees relative to the central longitudinal axis of the body in the axial direction.

15. The apparatus according to any one of claims 8 to 14, wherein, At least one of the inlets includes an inlet port or takes the form of an inlet port, and wherein the inlet port is angled relative to the central longitudinal axis of the body.

16. The apparatus according to any one of the preceding claims, wherein, The outlet device includes an outlet.

17. The apparatus according to claim 16, wherein, The device includes at least one of the following features: The outlet is circular or substantially circular; The outlet is disposed around the central longitudinal axis of the body; and / or The outlet is centered on the central longitudinal axis of the main body.

18. The apparatus according to any one of the preceding claims, wherein, The outlet device includes a cavity.

19. The apparatus according to claim 18, wherein, The cavity includes a base.

20. The apparatus according to claim 18 or 19, wherein, The device includes at least one of the following features: The cavity is formed in the body or otherwise disposed in the body; The cavity is arranged around the central longitudinal axis of the body.

21. The apparatus according to any one of claims 18 to 20, wherein, The cavity includes one or more sidewalls.

22. The apparatus according to claim 21, wherein: At least one of the sidewalls converges toward the outlet; At least one of the sidewalls includes or defines a curved shape; and / or At least one of the sidewalls includes or defines an S-shape.

23. The apparatus according to any one of claims 18 to 21, wherein, The cavity is in communication with each of the inlets of the inlet device.

24. The apparatus according to any one of claims 18 to 23, wherein, The cavity is configured to minimize or at least reduce pressure loss within the cavity.

25. A propeller comprising the means described in any one of the preceding claims.

26. A means of transport comprising one or more propellers as claimed in claim 25.

27. A method for preventing or at least mitigating the formation of hub vortices downstream of a propeller, said method using the apparatus according to any one of claims 1 to 24.

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