CN113799951B - Side pusher with wave-shaped trailing edge blades - Google Patents
Side pusher with wave-shaped trailing edge blades Download PDFInfo
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- CN113799951B CN113799951B CN202111176392.3A CN202111176392A CN113799951B CN 113799951 B CN113799951 B CN 113799951B CN 202111176392 A CN202111176392 A CN 202111176392A CN 113799951 B CN113799951 B CN 113799951B
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- blade
- trailing edge
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- blades
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- 239000012530 fluid Substances 0.000 claims abstract description 18
- 238000013461 design Methods 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims description 13
- 230000010349 pulsation Effects 0.000 abstract description 9
- 230000002829 reductive effect Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000011160 research Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H1/00—Propulsive elements directly acting on water
- B63H1/02—Propulsive elements directly acting on water of rotary type
- B63H1/12—Propulsive elements directly acting on water of rotary type with rotation axis substantially in propulsive direction
- B63H1/14—Propellers
- B63H1/26—Blades
Abstract
The invention relates to a side thruster with wave-shaped trailing edge blades, which comprises a plurality of blades, a hub and an outermost cylindrical shell; the plurality of blades are arranged on the hub, and the blade leading edges and the blade trailing edges are wavy leading edges and wavy trailing edges which extend along the radial direction of the hub. According to the fluid flow law, the efficiency of the side thruster is improved, meanwhile, the pressure pulsation and vibration energy induced by the fluid of the side thruster are reduced, the shapes of leading edges and trailing edges of the blades are redesigned by using a trigonometric function, the overcurrent capacity of the blades is rebuilt, the uniformity of the fluid on the blades is improved, the flow field pulsation energy induced by the falling of the fluid at the front edge and the rear edge is reduced, the vibration noise level is further reduced, the novel side thruster with the rectifying capacity is formed, the hydrodynamic performance is ensured, the working efficiency of the side thruster is improved, and the low-noise design purpose is achieved.
Description
Technical Field
The invention relates to the field of marine equipment and fluid machinery, in particular to a high-efficiency low-noise side thruster with waveform trailing edge blades.
Background
With the rapid development of world economy and the continuous enhancement of trade of various countries, shipping industry is increasingly prosperous, ships develop to large and specialized, the navigation density of ports is relatively improved, and water areas are relatively shallower and narrower. This places higher demands on the manoeuvrability of the vessel. The side pusher is used as an auxiliary propulsion device of the ship, can well assist the ship to safely enter and exit the narrow roadway, improves the operability of the ship, and enhances the turning capacity of the ship. Although the existing side thruster technology can meet the current technical requirements, along with the continuous promotion of the ship technology and the expansion of application fields, the development of the side thruster with higher efficiency and lower vibration noise level has great practical significance.
It is considered that the shape, position, paddle form, etc. of the side pusher have some influence on the operation of the side pusher, and thus many researchers have made many studies on the design of the side pusher from the viewpoint of improving the efficiency of the side pusher. Taylor studied the effect of the radius of the arc of the open end of the channel, the length of the channel, and the spread of the channel on the performance of the propeller in the static state. Stuntz investigated the additional resistance created by the rectifying device at the opening of the channel. Pehrsson investigated cavitation performance of a side thruster by performing systematic pool experiments on a side thruster of an adjustable propeller. The U.S. ship research and development center researches the radian radius of the opening of the channel (under static and navigational speed states) through a series of experiments, the screw pitch ratio of the propeller affects the efficiency of the front side propeller, and in addition, the flow field near the inlet and the outlet of the side propeller is analyzed through theoretical research and experimental research.
Disclosure of Invention
The method improves the rectifying capacity of the side thruster blade, improves the uniformity of fluid on the side thruster blade, breaks through the design method of the traditional linear blade front edge and the traditional linear blade rear edge, and provides the side thruster with the waveform trailing edge blade, so that the purposes of improving the working efficiency of the side thruster and reducing pressure pulsation are achieved.
The technical scheme of the invention is as follows: a side thruster with wave-shaped trailing edge blades comprises a plurality of blades, a hub and an outermost cylindrical shell; the plurality of blades are arranged on the hub, and the blade leading edges and the blade trailing edges are wavy leading edges and wavy trailing edges which extend along the radial direction of the hub.
Preferably, the shape of the blade leading edge and the shape of the blade trailing edge are designed into a waveform along the radial direction of the hub according to a trigonometric function relationship, so that the blade leading edge and the blade trailing edge with the capability of rectifying fluid are formed.
Preferably, the number of the blades is 4-6, and the blades are uniformly distributed along the circumferential direction of the hub.
Preferably, the wave guide edge and the wave trailing edge are suitable for a pitch-adjustable side thruster, a rim side thruster and a channel side thruster.
Preferably, the blade leading edge and the blade trailing edge include waveform boundaries formed by trigonometric functions, and are also applicable to waveform trailing edges formed by other functions.
The blade with the waveform trailing edgeThe blade guide and trailing edge waveform design method of the side thruster takes the center of the hub as the coordinate center, the vertical upward direction is the x axis, the horizontal rightward direction is the y axis, and the included angle between the connecting line of the starting point of the blade guide edge at the blade root and the center of the hub and the x axis is alpha 1 The included angle between the middle line of the wavy guide edge and the x axis is beta 1 The method comprises the steps of carrying out a first treatment on the surface of the The included angle between the line connecting the starting point of the trailing edge of the blade at the blade root and the center of the hub and the x axis is alpha 2 The included angle between the middle line of the wavy profile of the wavy trailing edge and the x axis is beta 2 The hub radius is R, the blade radius is R, and the coordinate point (x i ，y i ) Satisfies the formula (1), and the coordinate point (x) j ，y j ) Satisfy formula (2);
y i cosβ 1 ＝gsin[x i cosβ 1 -y i sinβ 1 -rcos(α 1 -β 1 )]-rsin(α 1 -β 1 )-x i sinβ 1 (1)
y j cosβ 2 ＝-gsin[x j cosβ 2 +y j sinβ 2 -rcos(α 2 -β 2 )]+rsin(α 2 -β 2 )+x j sinβ 2 (2)
wherein g is a coefficient, x i For rcos alpha 1 Arbitrary coordinate value between R and x j For rcos alpha 2 And R.
The invention has the beneficial effects that: the invention relates to a side pusher with a wave-shaped trailing edge blade, which designs the trailing edge of the blade and the shape of the trailing edge into a wave shape along the radial direction according to a trigonometric function relation to form the trailing edge of the blade with the capability of rectifying fluid. The method utilizes the principle of inhibiting boundary layers and wake vortices of the wavy blades, improves the flow uniformity of fluid on the blades, reduces the generation of unsteady flow structures and the consumption of fluid energy, and simultaneously reduces the flow field pulsation energy induced by the falling off of the fluid at the leading edge, thereby reducing the vibration noise level of the side thruster, further achieving the purpose of improving the working efficiency of the side thruster and reducing noise.
Drawings
FIG. 1 is a schematic diagram of a side pusher of a conventional straight-sided trailing edge vane;
FIG. 2 is a schematic diagram of a side pusher with wave-shaped trailing edge vanes according to the present invention;
FIG. 3 is a front view of a three-dimensional model of a side pusher with wave guide edge blades of the present invention;
FIG. 4 is a side view of a three-dimensional model of a side pusher with wave guide edge blades of the present invention;
FIG. 5 is a graph of simulation of pressure pulsation energy of a conventional straight-sided trailing edge vane side pusher;
FIG. 6 is a graph of simulation of pressure pulsation energy of a side pusher with a wave-shaped trailing edge blade according to the present invention.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples. The present embodiment is implemented on the premise of the technical scheme of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following examples.
As shown in fig. 1 and 2, the side thruster comprises a plurality of blades 1, a hub 2 and an outermost cylindrical housing 3. The invention relates to a blade with improved blade guiding edges and blade trailing edges, which are designed into wavy guiding edges and wavy trailing edges extending along the radial direction of a hub.
As shown in FIG. 2, the side thruster structure of the blade with waveform trailing edge takes the center of the hub as the coordinate center, the vertical upward direction is the x axis, the horizontal rightward direction is the y axis, and the included angle between the connecting line of the starting point of the blade leading edge at the blade root and the center of the hub and the x axis is alpha 1 The included angle between the middle line of the wavy guide edge and the x axis is beta 1 The included angle between the X-axis and the line connecting the starting point of the wavy trailing edge at the blade root and the center of the hub is alpha 2 The included angle between the middle line of the wavy profile of the wavy trailing edge and the x axis is beta 2 The angle alpha is designed according to the ship propeller theory and the related design data and experience 1 、β 1 、α 2 、β 2 Is a value of (2).
Conventional sides as shown in FIG. 1The straight-edge guiding blade schematic diagram of the propeller blade takes the center of the hub as a coordinate center according to the ship propeller theory and related design data and experience, and the included angle between the connecting line of the starting point of the straight-line guiding edge at the blade root and the center of the hub and the x axis is designed to be 35 degrees, and the included angle between the straight-line guiding edge and the x axis is designed to be 26 degrees; the included angle between the connecting line of the starting point of the straight-line trailing edge at the blade root and the center of the hub and the x axis is 33 degrees, the included angle between the straight-line trailing edge and the x axis is 21 degrees, the hub radius r=750mm, and the blade radius r=2550mm. On the basis, the design angle and radius are unchanged, alpha 1 ＝35°，β 1 ＝26°，α 2 ＝33°，β 2 ＝21°。
As shown in the schematic diagram of the side thruster structure of the wave-shaped trailing edge blade shown in fig. 2, the shape of the trailing edge and the blade trailing edge are designed into wave shapes according to a trigonometric function relation along the radial direction of the hub, so that the blade trailing edge with the capability of rectifying fluid is formed. At rcos alpha 1 Taking a certain number of x coordinate values with R, obtaining corresponding y coordinate values according to the formula (1), and obtaining all (x) i ，y i ) The coordinates establish a contoured guide curve. Similarly, in rcos alpha 2 Taking a certain number of x coordinate values with R, obtaining corresponding y coordinate values according to the formula (2), and obtaining all (x) j ，y j ) The coordinates establish a wavy trailing edge curve. Taking the center of a propeller hub as a round point, uniformly and alternately drawing circular arcs between a wavy leading edge and a wavy trailing edge, making a rotation length at the corresponding radius of each circular arc center, then designing the section shape of each blade of the propeller by using the chord length, and finally obtaining a propeller entity according to the section of each radius blade by a skin lofting method and the like, wherein the propeller entity is shown in figures 3 and 4.
y i cosβ 1 ＝gsin[x i cosβ 1 -y i sinβ 1 -rcos(α 1 -β 1 )]-rsin(α 1 -β 1 )-x i sinβ 1 (1)
y j cosβ 2 ＝-gsin[x j cosβ 2 +y j sinβ 2 -rcos(α 2 -β 2 )]+rsin(α 2 -β 2 )+x j sinβ 2 (2)
Where g is a coefficient.
As shown in figures 5 and 6, the straight-edge guide edge blade and the side thruster with the wave-shaped guide edge blade have the pressure pulsation energy simulation graphs, and the pressure pulsation of the side thruster with the wave-shaped guide edge blade is weak and the overflow is more uniform after the side thruster with the wave-shaped guide edge blade is obviously improved.
Through changing the leading edge and the trailing edge shape of the side thruster blade, the overcurrent capacity of the blade is reconfigured, fluid flowing through the blade is rectified, the non-uniform flow structure of the fluid and the consumption of fluid energy are reduced, the uniformity of the fluid on the blade is improved, the pressure pulsation energy induced by the falling of the fluid on the leading edge of the blade is reduced, the working efficiency of the side thruster is finally improved, and the purpose of noise reduction design is achieved.
The number of the blades is 4-6, and the blades are uniformly distributed along the circumferential direction. The waveform trailing edge blade is suitable for the adjustable pitch type side thrusters, the rim side thrusters and the channel type side thrusters.
The waveform trailing edge blade comprises a waveform boundary formed by a trigonometric function, and is also applicable to waveform trailing edges formed by other functions.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (5)
1. A blade guide and trailing waveform design method of a side thruster with waveform trailing blades is characterized in that the side thruster comprises a plurality of blades, a hub and an outermost cylindrical shell; the blades are arranged on the hub, and the blade leading edges and the blade trailing edges are wavy leading edges and wavy trailing edges which extend along the radial direction of the hub; the shape of the leading edge of the blade and the trailing edge of the blade are designed into a waveform according to a trigonometric function relation along the radial direction of the hub, so that the fluid inlet device is formedBlade guide and trailing edge with row rectifying capability; taking the center of the hub as a coordinate center, taking the vertical upward direction as an x axis, taking the horizontal rightward direction as a y axis, and taking the included angle between the connecting line of the starting point of the blade leading edge at the blade root and the center of the hub and the x axis as alpha 1 The included angle between the middle line of the wavy guide edge and the x axis is beta 1 The method comprises the steps of carrying out a first treatment on the surface of the The included angle between the line connecting the starting point of the trailing edge of the blade at the blade root and the center of the hub and the x axis is alpha 2 The included angle between the middle line of the wavy profile of the wavy trailing edge and the x axis is beta 2 The hub radius is R, the blade radius is R, and the coordinate point (x i ，y i ) Satisfies the formula (1), and the coordinate point (x) j ，y j ) Satisfy formula (2);
y i cosβ 1 ＝gsin[x i cosβ 1 -y i sinβ 1 -rcos(α 1 -β 1 )]-rsin(α 1 -β 1 )-x i sinβ 1 (1)
y j cosβ 2 ＝-gsin[x j cosβ 2 +y j sinβ 2 -rcos(α 2 -β 2 )]+rsin(α 2 -β 2 )+x j sinβ 2 (2)
wherein g is a coefficient, x i For rcos alpha 1 Arbitrary coordinate value between R and x j For rcos alpha 2 And R.
2. The method for designing the blade guide and trailing edge waveform of the side thruster with the waveform guide and trailing edge blades according to claim 1, wherein the number of the blades is 4-6, and the blades are uniformly distributed along the circumferential direction of the hub.
3. The method of designing a blade guide and trailing wave form for a side pusher having a wave guide trailing blade according to claim 1, wherein the wave guide and trailing are adapted for use with an adjustable pitch side pusher.
4. The method of designing a blade guide, trailing edge waveform for a side pusher with a waveform trailing edge blade of claim 1, wherein the waveform leading edge and waveform trailing edge are adapted for use with a rim side pusher.
5. The method of designing a vane guide, trailing edge waveform of a side pusher with a waveform guide trailing edge vane of claim 1, wherein the waveform guide edge and the waveform trailing edge are adapted for use with a channel side pusher.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111176392.3A CN113799951B (en) | 2021-10-09 | 2021-10-09 | Side pusher with wave-shaped trailing edge blades |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111176392.3A CN113799951B (en) | 2021-10-09 | 2021-10-09 | Side pusher with wave-shaped trailing edge blades |
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| Publication Number | Publication Date |
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| CN113799951A CN113799951A (en) | 2021-12-17 |
| CN113799951B true CN113799951B (en) | 2024-03-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111176392.3A Active CN113799951B (en) | 2021-10-09 | 2021-10-09 | Side pusher with wave-shaped trailing edge blades |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6164919A (en) * | 1997-12-12 | 2000-12-26 | Vanmoor; Arthur | Propeller and impeller blade configuration |
| CN102673758A (en) * | 2012-05-15 | 2012-09-19 | 哈尔滨工程大学 | Propeller with convex and concave guide edge |
| CN105129061A (en) * | 2015-08-10 | 2015-12-09 | 上海斯玛德大推船用螺旋桨设计有限公司 | Propeller |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6749401B2 (en) * | 2002-07-22 | 2004-06-15 | Arthur Vanmoor | Hydrodynamically and aerodynamically optimized leading edge structure for propellers, wings, and airfoils |
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2021
- 2021-10-09 CN CN202111176392.3A patent/CN113799951B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6164919A (en) * | 1997-12-12 | 2000-12-26 | Vanmoor; Arthur | Propeller and impeller blade configuration |
| CN102673758A (en) * | 2012-05-15 | 2012-09-19 | 哈尔滨工程大学 | Propeller with convex and concave guide edge |
| CN105129061A (en) * | 2015-08-10 | 2015-12-09 | 上海斯玛德大推船用螺旋桨设计有限公司 | Propeller |
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| CN113799951A (en) | 2021-12-17 |
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