CN112115562A - Pump-jet propeller with blade tip circular ring embedded in guide pipe groove and design method thereof - Google Patents
Pump-jet propeller with blade tip circular ring embedded in guide pipe groove and design method thereof Download PDFInfo
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Abstract
The invention belongs to the field of underwater vehicle propellers, and particularly relates to a pump jet propeller with a rotor tip provided with a ring and embedded in a groove on the inner wall of a guide pipe and a design method thereof. The design method can avoid cavitation of tip clearance and tip wake cavitation; after the tip of the rotor blade is provided with the circular ring, the rigidity is obviously improved compared with that of an ordinary rotor blade, the natural frequency of the rotor blade is favorably avoided from the natural frequency of a tail structure of the boat body, the structural resonance is avoided, the exciting force of the rotor blade caused by self transient parallel is obviously reduced, the strength of the rotor blade is obviously increased, the backing strength of the rotor can be greatly improved, the exciting force of the rotor is conveniently reduced through the side bevel angle of the larger rotor blade, and the difficulty of the processing technology of the rotor blade is reduced.
Description
Technical Field
The invention belongs to the field of underwater vehicle propellers, and particularly relates to a pump jet propeller with a rotor tip provided with a ring and embedded in a groove on the inner wall of a guide pipe and a design method thereof.
Background
The pump jet propeller has the advantages of effectively delaying cavitation, reducing radiation noise of an underwater vehicle, improving propelling efficiency and the like, and is widely applied to the underwater vehicle, but the pump jet propeller still has some problems in practical application, particularly a strong complex vortex system exists between the tip of a rotor and the inner wall of a guide pipe, and the abnormal vortex system not only can generate flow noise, but also can form a low-pressure area between the end surface of the tip of the rotor and the vortex core of the tip to cause cavitation of the tip gap and cavitation of the tip vortex, so that cavitation noise is generated, and the noise of the propeller is obviously increased. In addition, the abnormal strong vortex flow can also cause the rotor and the duct to generate excitation, and generate structural vibration noise. Therefore, controlling the tip vortex of the pump jet propeller is an important way for reducing the radiation noise of the pump jet propeller. The pump-jet propeller generally comprises a guide pipe and a stator blade which are fixed at the tail part of a boat body, and a rotor which is arranged on a main shaft, wherein a small gap, namely a blade tip gap, exists between the tip part of the rotor blade and the inner wall of the guide pipe, although the size of the blade tip gap is small, the flow field in the narrow space of the blade tip gap is the most complicated in the flow field in the guide pipe of the whole pump-jet propeller, because the surface of the rotor blade and the end surface of the blade tip have obvious included angle to form shape distortion, the rotor blade rotates to generate strong flow separation phenomenon near the boundary line of the end surface of the blade tip, and tip gap separation vortex is formed, so that the pressure in the area near the tip part is reduced sharply, tip gap cavitation is formed, meanwhile, fluid overturns from the pressure surface of the tip part to the end surface of the blade tip and then from the end surface of the blade tip to the suction surface, and the fluid overturn can form concentrated leakage, at the vortex core of the tip vortex, the pressure is low, and tip vortex cavitation is easy to form. The cavitation of the tip gap of the pump jet propeller is firstly generated, the cavitation of the tip vortex can also be generated along with the increase of the rotating speed, and the cavitation of the blade back can be generated along with the continuous increase of the rotating speed, so in general, the cavitation of the tip gap and the cavitation of the tip vortex are prior to the cavitation of the rotor blade back, and the cavitation of the tip gap and the cavitation of the tip vortex are firstly solved to inhibit the cavitation of the pump jet propeller and improve the cavitation initial navigational speed of the pump jet propeller.
Disclosure of Invention
Aiming at the problems, the invention provides a pump jet propeller with a rotor tip provided with a circular ring and embedded in a groove on the inner wall of a guide pipe and a design method thereof, the pump jet propeller can effectively control the fluid separation of the tip of a rotor blade of the pump jet propeller, fundamentally solves the problem of tip clearance cavitation, simultaneously can prevent the fluid near the blade tip from turning over, inhibits the tip from leaking out of vortex, prevents the cavitation of the tip vortex, improves the cavitation starting speed, reduces the exciting force of a propeller, weakens the noise of the pump jet propeller, and improves the propelling efficiency of the propeller.
In order to achieve the purpose, the invention adopts the following technical scheme.
A pump jet propeller with a ring at the tip of a rotor and embedded in a groove on the inner wall of a guide pipe comprises the guide pipe, a stator blade, the rotor blade and a ring at the tip of the rotor blade, wherein the rotor blade is fixed on a rotor hub which is arranged on a transmission shaft system extending out of the tail of a boat body, the transmission shaft system is connected with a propulsion motor arranged at the tail of the boat body, the rotor is driven to rotate by the propulsion motor arranged at the tail of the boat body, the inner wall of the guide pipe is provided with an annular groove, the rotor blade is fixedly connected with the ring at the tip of the rotor blade, the ring at the tip of the rotor blade is embedded in the annular groove at the inner wall of the guide pipe, a gap exists between the ring and the groove at the inner wall of the guide pipe, the guide pipe is fixedly connected with a stator, the stator hub is fixedly arranged at the tail of the boat body, the force generated by the guide pipe and the stator is transmitted, the gap between the two is filled with fluid only, and the thrust bearing is arranged on the rotor shaft. The pump spraying propeller with the blade tip circular ring embedded in the groove of the guide pipe is further improved, the blade tip circular ring is of a rotary body structure with a rotor axis as a rotating shaft, the outer surface of the tip circular ring is a cylindrical surface, and the inner surface of the circular ring is in a linear shape with the inner wall of the guide pipe, so that the integrity of the shape of the inner wall of the guide pipe is ensured, and the efficiency of the propeller is equivalent to that of a conventional pump spraying propeller.
The front end face of the tip ring is positioned in front of a tip guide edge of the impeller, the rear end face of the tip ring is positioned behind a tip trailing edge of the impeller, the front end face and the rear end face are planes and are both vertical to the axial direction of the rotor, and certain gaps are formed between the front end and the rear end of the tip ring and the guide groove to prevent the tip ring and the guide groove from being rubbed and bumped. The pump jet propeller with the blade tip circular ring embedded in the guide groove is further improved, the annular groove is of an annular rotary structure with a rotor axis as a rotating shaft, the circumferential surface of the annular groove is a cylindrical surface, the radius of the cylindrical surface is larger than that of the outer circular surface of the tip circular ring, the front inner wall surface and the rear inner wall surface of the annular groove are planes perpendicular to the rotor axis, a certain gap is guaranteed between the outer surface of the tip circular ring of the rotor and the cylindrical surface of the groove, and the tip circular ring and the groove are prevented from being rubbed with each other, are simple in shape and are easy to machine and form.
The invention also provides a design method of the pump jet propeller, wherein the tip of the rotor is provided with a circular ring and is embedded in the groove of the inner wall of the guide pipe, and the design method comprises the following steps:
(1) theoretically analyzing and selecting the geometric parameters of the pump jet propeller according to the design conditions and the design requirements of the underwater vehicle, and determining the primary main geometric parameters of the guide pipe, the stator and the rotor;
(2) in consideration of three aspects of efficiency and rotor cavitation performance, the surface element method and the CFD method are adopted to optimally design the geometric shape of the conduit, and the geometric shape of the conduit is determined;
(3) in consideration of two factors of efficiency and rotor bearing force, the surface element method and the CFD method are adopted to optimally design the installation position, the number of blades, the chord length, the geometric attack angle, the camber distribution and the thickness distribution of the stator, and the geometric shape and the installation position of the stator are determined;
(4) considering the factors of efficiency, rotor cavitation performance and rotor bearing force, optimally designing a rotor blade by adopting a surface element method and a CFD (computational fluid dynamics) method, and determining the geometric shape of a rotor;
(5) the axial length of the rotor is L1, the axial distance between the front end face of the rotor tip ring and the leading edge of the blade tip section is L2, the axial distance between the rear end face of the rotor tip ring and the trailing edge of the blade tip section is L3, and the axial length of the tip ring is L1+ L2+ L3. The method comprises the following steps of carrying out balance design on L1 and L2 according to the requirements of tip vortex suppression effect, propeller efficiency, rotor rigidity and natural frequency, and carrying out balance design on the radial thickness H of a rotor ring according to the requirements of rotor weight, duct strength, rigidity and natural frequency;
(6) after the geometrical shape of the tip ring is determined, the geometrical size of the annular groove is optimally designed, the gap between the front end face of the annular groove and the front end face of the tip ring is d1, the gap between the rear end face of the annular groove and the rear end face of the tip ring is d2, and the gap between the cylindrical surface of the groove and the outer surface of the tip ring is d3, firstly, according to the processing precision, the assembly precision and the jumping amplitude of a rotor shaft of the impeller and a conduit, the impeller is ensured not to be rubbed with the annular groove in the rotating process, the minimum values of d1, d2 and d3 are determined, and then the influence of d1, d2 and d3 on the efficiency of the pump jet propeller is analyzed through numerical calculation, and the numerical values of parameters such as d1, d2 and d3 are selected;
(7) establishing a numerical calculation model of the hull, the stator, the impeller, the tip ring, the guide pipe and the inner wall of the guide pipe of the underwater navigation body, calculating and judging whether the hydrodynamic performance, the thrust, the rotor absorption power and the efficiency of the pump jet propeller meet the design requirements or not, and entering the next step if the hydrodynamic performance, the thrust, the rotor absorption power and the efficiency of the pump jet propeller meet the design requirements; otherwise, redesigning the section shape of the impeller until the design requirement is met;
(8) calculating the exciting force and low-frequency line spectrum noise of the pump jet propeller by adopting a numerical calculation method, calculating and judging whether the exciting force and the low-frequency line spectrum noise of the propeller meet the design requirements, and if so, determining the geometric shape of the pump jet propeller with the final blade tip circular ring embedded into the groove of the guide pipe; if not, redesigning the side-inclined distribution of the impeller until the exciting force and the low-frequency line spectrum of the propeller meet the design requirements.
The beneficial effects are that:
the pump jet propeller is provided with the circular ring at the tip part of the rotor and is embedded into the groove on the inner wall of the guide pipe, the circular ring is arranged at the tip part of the rotor, and the tip part of the rotor is blocked by the circular ring, so that the separation phenomenon of high-speed fluid passing through the tip part of the rotor can not occur, the separation vortex at the tip part of the rotor is basically eliminated, and the occurrence of tip clearance cavitation can be avoided. Meanwhile, the tip ring prevents the fluid from turning over from a high-pressure area of the blade surface to a low-pressure area of the blade back through the tip, so that the intensity of the leaked vortex in the wake flow at the tip is greatly reduced, and tip wake cavitation can be avoided;
meanwhile, after the tip of the rotor blade is provided with the circular ring, the rigidity is obviously improved compared with that of the common rotor blade, so that the natural frequency of the rotor blade is beneficial to avoiding the natural frequency of the tail structure of the hull, and the structural resonance is avoided. The rigidity of the rotor blade is increased due to the tip ring, the pulsation deformation of the rotor blade in the working process is obviously reduced, and the exciting force of the rotor blade caused by self transient parallelism can be obviously reduced. After the tip of the rotor blade is provided with the circular ring, the strength of the rotor blade can be obviously increased, particularly the backing strength of the rotor can be greatly improved, and the excitation force of the rotor can be reduced conveniently by arranging a larger side bevel angle of the rotor blade.
Meanwhile, in the machining process, the deformation of the rotor blade is obviously reduced, the machining precision of the rotor blade is improved, and the difficulty of the machining process of the rotor blade is reduced.
Drawings
FIG. 1 is a perspective view of a conventional pump jet;
FIG. 2 is a front view of a conventional pump jet;
FIG. 3 is a cross-sectional view of a pump jet impeller with a blade tip ring embedded in a groove of a conduit;
FIG. 4 is a schematic view of a pump jet groove and ring with a blade tip ring inserted into the groove of the conduit.
FIG. 5 is a schematic view showing an installation structure of a guide pipe in the embodiment;
FIG. 6-1 is an original cloud view of the vorticity of the flow field at a location near the tip end face of the rotor;
FIG. 6-2 is a cloud view of the present application of the location of the flow field vorticity near the tip end face of the rotor;
FIG. 7-1 is an original cloud of pressure distributions at locations near the end face of the rotor tip;
FIG. 7-2 is a cloud of the present application illustrating pressure distribution near the tip end face of the rotor;
FIG. 8-1 is a raw cloud plot of rotor tip wake vorticity;
FIG. 8-2 is a cloud view of a rotor tip wake vorticity of the present application;
FIG. 9-1 is a raw cloud of rotor tip wake vortex core pressure;
FIG. 9-2 is a cloud of the present application of rotor tip wake vortex core pressure;
the reference numbers include:
Detailed Description
The invention is described in detail below with reference to specific embodiments.
As shown in fig. 1, for an a-type underwater vehicle as an example, since the conventional pump jet propeller has a sharp corner at the intersection of the tip end face of the rotor, the pressure face and the suction face of the rotor, which causes shape distortion, the rotor forms a sharp flow discontinuity near the intersection line during rotation, which causes strong fluid separation, separation vortex, and a sharp pressure drop in the region near the tip end face, and the drop increases with the increase of the rotor speed, which leads to cavitation-tip clearance cavitation at the tip end face of the blade. Meanwhile, the pressure value of the rotor blade surface is large, the pressure value of the rotor blade back is low, pressure difference exists between the rotor blade surface and the rotor blade back, and near the end face of the tip of the rotor, because the distance between the pressure surface and the suction surface is small, a large pressure gradient can be formed between the tip blade surface and the blade back at the corresponding position, fluid can overturn to the end face of the tip of the blade from the pressure surface and then overturn to the suction surface from the end face of the tip of the blade, and fluid overturn near the tip of the rotor can intensify fluid separation near the end face of the tip. In addition, the linear velocity of the rotor blade tip is relatively high, the inner wall of the conduit is stationary, the clearance between the inner wall of the conduit and the rotor tip end surface is relatively small, the linear velocity is very different, the circumferential velocity of the fluid in contact with the rotor tip end surface in the clearance between the rotor tip end surface and the inner wall of the conduit is equal to the linear velocity of the rotor according to the nature of the viscous fluid, the velocity of the fluid in contact with the inner wall of the conduit is zero, and the clearance is usually very small, so the gradient of the circumferential velocity of the flow in the clearance between the rotor tip end surface and the inner wall of the conduit in the radial direction is very large, a strong "swept vortex" is formed at the rotor end surface, and the flow distribution characteristic aggravates the flow separation tendency near the rotor tip, and the pressure drop in the area. The fluid is overturned from the tip pressure surface to the tip end surface and then overturned from the tip end surface to the suction surface, the fluid overturning can also enable the fluid to form concentrated leakage vortexes in the wake flow of the rotor tip, and the tip vortex cavitation is easily formed because the pressure is very low at the vortex core of the tip leakage vortexes.
The factors interfere with each other to influence each other, and finally, the conventional pump jet propeller is easy to generate cavitation near the tip of the rotor during the working process, so that the noise is obviously increased, the sailing speed and the hiding capability of a ship or an underwater vehicle are greatly limited, the maximum sailing speed without cavitation of a certain type A underwater vehicle/ship based on the conventional pump jet propeller is limited to 15kn under the influence of the factors,
through simulation, the variation of various parameters with the navigation speed (or the engine power and the like) in the straight navigation is shown in the table 1.
TABLE 1 data of various parameters varying with navigational speed while a certain A-type underwater vehicle/ship is in straight line navigation
Based on the aforementioned current situation and problems, the present invention provides a grooved pump jet propeller as shown in fig. 1, comprising a grooved pipe 1, a stator 2 (with a stator hub 5), a rotor 3 with a ring 6 (with a rotor hub 4). The guide pipe with the groove and the stator are processed together and fixed at the tail part of the submarine body through the stator hub, the stator and the guide pipe line can be designed according to specific conditions, and the guide pipe can be an accelerating guide pipe or a decelerating guide pipe. The rotor is machined with the ring, as the case may be, in width (n) and thickness (m) of the ring, the rotor providing thrust through the rotor hub in connection with the drive shaft. The relationship between the ring and the groove is shown in fig. 4, the groove is formed on the inner wall of the conduit, so that the ring at the tip of the rotor is just embedded in the groove, and the linear integrity of the inner wall of the conduit is ensured. Considering the special rotor and duct of this patent, in this embodiment, to facilitate the installation of the pump jet, the duct is designed to be broken at the groove and divided into front and rear A, B parts, as shown in fig. 5. When the pump jet propeller is specifically installed, the guide pipe B part is installed firstly, then the rotor is installed, and finally the guide pipe A part is installed. The rotor blades and the rotor blade tip circular ring are fixed on a rotor hub, the rotor hub is arranged on a transmission shaft system extending out of the tail of the boat body, the transmission shaft system is connected with a propulsion motor arranged at the tail of the boat body, and the rotor is driven to rotate to work by the propulsion motor arranged at the tail of the boat body; the inner wall of the guide pipe is provided with an annular groove, the rotor blades are fixedly connected with the blade tip annular ring, the rotor blade tip annular ring is rotatably arranged in the annular groove in the inner wall of the guide pipe, a gap exists between the annular ring and the groove in the inner wall of the guide pipe, the guide pipe is fixedly connected with the stator, the stator hub is fixedly arranged at the tail of the boat body, force generated by the guide pipe and the stator is transmitted to the boat body through the stator hub, fluid is filled between the annular ring at the tip part of the rotor and the guide pipe, and the thrust bearing is arranged on the rotor shaft.
Through simulation, the maximum sailing speed of a certain A-type underwater vehicle of the pump-jet propeller with the blade tip circular ring embedded in the guide pipe groove can reach 24kn without cavitation, and the change condition of various parameters along with the sailing speed during straight-line sailing and the change condition relative to the traditional pump-jet propeller are shown in table 2.
TABLE 2 data of various parameters varying with navigation speed when a certain type A underwater vehicle of the pump-jet propeller with blade tip rings embedded in the grooves of the guide tubes of the present invention is navigated linearly and their variation is compared with the corresponding data in TABLE 1
When the rotor rotates to a certain same position, the comparison results of the vortex quantity cloud maps of the flow field at the position near the end surface of the tip of the rotor are shown in figures 6-1 and 6-2, the comparison results of the pressure distribution cloud maps at the position near the end surface of the tip of the rotor are shown in figures 7-1 and 7-2, the comparison results of the vortex quantity cloud maps of the tip of the rotor are shown in figures 8-1 and 8-2, and the comparison results of the pressure cloud maps of the vortex core of the tip of the rotor are shown in figures 9-1 and 9-2.
As can be seen from fig. 6-1/2 and fig. 7-1/2, the pump jet impeller of the present invention, which has a ring at the tip and is embedded in a groove on the inner wall of a conduit, has the advantages that the flow discontinuity near the boundary line of the rotor and the conduit is fundamentally solved, the fluid separation phenomenon is effectively suppressed, the tip fluid separation phenomenon is effectively solved, the strength of the separation vortex is greatly reduced, and the tip pressure drop is also significantly reduced.
As can be seen from fig. 8-1/2 and fig. 9-1/2, in the pump jet propeller of the present invention, which has a ring at the rotor tip and is embedded in a groove on the inner wall of the conduit, the ring at the rotor tip resists the fluid from turning from the pressure surface to the suction surface at the rotor tip, the strength of the tip wake vortex is effectively suppressed, the strength of the wake vortex is greatly reduced, and the pressure drop of the wake vortex core is also greatly reduced.
The analysis of table 2 shows that the pump-jet propeller based on the blade tip ring embedded conduit groove of the present invention can effectively reduce the tip end face separation vortex amplitude, and the amplitude is reduced by more than 92% compared with the conventional pump-jet propeller; the extreme value of the pressure drop coefficient of the tip of the rotor can be greatly reduced, and the reduction amplitude reaches more than 60%; the amplitude of the tip wake vortex is obviously reduced by more than 46 percent; the cavitation-free maximum flight speed of the pump jet propeller is greatly improved, wherein the cavitation starting flight speed of the tip gap is increased by more than 12kn, the cavitation starting flight speed of the tip wake vortex is increased by more than 9kn, the cavitation of the tip gap can be basically avoided fundamentally, the speed noise of the pump jet propeller is reduced, and the effect of improving the stealth of the underwater navigation body is achieved.
Meanwhile, in order to facilitate the application of the propeller of the invention on the existing equipment or a submarine vehicle, simultaneously improve the design efficiency of the propeller and reduce the difficulty of popularization and application, the invention also provides a design method of the pump spraying propeller with the blade tip circular ring embedded in the groove of the guide pipe, which comprises the following steps:
firstly, according to the design conditions and design requirements of an underwater navigation body, carrying out theoretical analysis and model selection on the geometric parameters of a pump jet propeller, and determining the primary main geometric parameters of a guide pipe, a stator and a rotor;
secondly, from the three aspects of efficiency and rotor cavitation performance, the surface element method and the CFD method are adopted to carry out optimization design on the geometric shape of the conduit, and the geometric shape of the conduit is determined;
considering two factors of efficiency and rotor bearing force, optimally designing the installation position, the number of blades, the chord length, the geometric attack angle, the camber distribution and the thickness distribution of the stator by adopting a surface element method and a CFD (computational fluid dynamics) method, and determining the geometric shape and the installation position of the stator;
considering the three factors of efficiency, rotor cavitation performance and rotor bearing force, optimally designing the rotor blade by adopting a surface element method and a CFD (computational fluid dynamics) method, and determining the geometric shape of the rotor;
the axial length of the rotor is L1, the front end face of the rotor tip ring is positioned in front of the leading edge of the blade tip section, the axial distance between the front end face and the leading edge is L2, the axial distance between the rear end face of the rotor tip ring and the trailing edge of the blade tip section is L3, and the axial length of the tip ring is L1+ L2+ L3. The method comprises the following steps of carrying out balance design on L1 and L2 according to the requirements of tip vortex suppression effect, propeller efficiency, rotor rigidity and natural frequency, and carrying out balance design on the radial thickness H of a rotor ring according to the requirements of rotor weight, duct strength, rigidity and natural frequency;
after the geometrical shape of the tip ring is determined, optimally designing the geometrical size of the annular groove, wherein the gap between the front end face of the annular groove and the front end face of the tip ring is d1, the gap between the rear end face of the annular groove and the rear end face of the tip ring is d2, and the gap between the cylindrical surface of the groove and the outer surface of the tip ring is d3, firstly, according to the processing precision, the assembly precision and the jumping amplitude of a rotor shaft of the impeller, ensuring that the impeller does not rub against the annular groove in the rotating process, determining the minimum value of d1, d2 and d3, and then, analyzing the influence of d1, d2 and d3 on the efficiency of the pump-jet propeller by numerical calculation, and selecting appropriate numerical values of parameters such as d1, d2 and d 3;
seventhly, establishing a numerical calculation model of the underwater navigation body, the stator, the impeller, the tip ring, the guide pipe and the inner wall of the guide pipe, calculating and judging whether the hydrodynamic performance of the pump jet propeller, the thrust of the pump jet propeller, the absorption power of the rotor and the efficiency of the pump jet propeller meet design requirements or not, and entering the next step if the hydrodynamic performance, the thrust of the pump jet propeller, the absorption power of the rotor and the efficiency of the pump jet propeller; otherwise, redesigning the section shape of the impeller until the design requirement is met;
calculating the excitation force and the low-frequency line spectrum noise of the pump-jet propeller by adopting a numerical calculation method, calculating and judging whether the excitation force and the low-frequency line spectrum noise of the propeller meet the design requirements, and if so, determining the geometric shape of the pump-jet propeller with the final blade tip circular ring embedded into the guide pipe groove; if not, redesigning the side-inclined distribution of the impeller until the exciting force and the low-frequency line spectrum of the propeller meet the design requirements.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (8)
1. The utility model provides a propeller is spouted to pump of blade tip ring embedding pipe recess which characterized in that: comprises a conduit, a stator blade, a rotor blade and a rotor blade tip ring;
the rotor blades and the rotor blade tip circular ring are fixed on a rotor hub, the rotor hub is arranged on a transmission shaft system extending out of the tail of the boat body, the transmission shaft system is connected with a propulsion motor arranged at the tail of the boat body, and the rotor is driven to rotate to work by the propulsion motor arranged at the tail of the boat body;
the inner wall of the guide pipe is provided with an annular groove, the rotor blades are fixedly connected with the blade tip annular ring, the rotor blade tip annular ring is rotatably arranged in the annular groove in the inner wall of the guide pipe, a gap exists between the annular ring and the groove in the inner wall of the guide pipe, the guide pipe is fixedly connected with the stator, the stator hub is fixedly arranged at the tail of the boat body, force generated by the guide pipe and the stator is transmitted to the boat body through the stator hub, fluid is filled between the annular ring at the tip part of the rotor and the guide pipe, and the thrust bearing is arranged on the rotor shaft.
2. The pump jet propeller of claim 1, wherein the blade tip ring is a solid of revolution having a rotor axis as a rotation axis, the outer surface of the tip ring is a cylindrical surface, and the inner surface of the tip ring is linearly conformal with the inner wall of the duct.
3. The pump-jet impeller with the tip ring inserted into the channel of the impeller of claim 1, wherein the front end of the tip ring is located forward of the leading edge of the tip of the impeller, the rear end of the tip ring is located rearward of the trailing edge of the tip of the impeller, and the front and rear ends are planar and are both axially perpendicular to the rotor.
4. The pump jet propeller of claim 1, wherein the annular groove is an annular revolution structure having a rotor axis as a rotation axis, a circumferential surface of the annular groove is a cylindrical surface having a radius larger than a radius of an outer circumferential surface of the tip ring, and front and rear inner wall surfaces of the annular groove are planes perpendicular to the rotor axis.
5. The pump-jet propeller with the blade tip ring embedded in the groove of the guide pipe as claimed in claim 1, wherein the guide pipe main body is made of carbon fiber or glass fiber, metal parts are used at the front and rear section interfaces, the metal parts are embedded in the front and rear section guide pipe main bodies, and the front and rear section guide pipe main bodies are assembled through the matching of the metal parts during installation.
6. A design method of a pump spraying propeller with a blade tip circular ring embedded in a guide pipe groove is characterized by comprising the following steps:
firstly, according to the design conditions and design requirements of an underwater navigation body, carrying out theoretical analysis and model selection on the geometric parameters of a pump jet propeller, and determining the primary main geometric parameters of a guide pipe, a stator and a rotor;
secondly, by taking the propeller efficiency and the rotor cavitation performance parameters as optimization targets, optimally designing the geometric shape of the guide pipe by adopting a surface element method and a CFD (computational fluid dynamics) method, and determining the geometric shape of the guide pipe;
taking two parameters of propeller efficiency and rotor bearing force as optimization targets, optimally designing the installation position, the number of blades, the chord length, the geometric attack angle, the camber distribution and the thickness distribution of the stator by adopting a surface element method and a CFD (computational fluid dynamics) method, and determining the geometric shape and the installation position of the stator;
taking two parameters of propeller efficiency and rotor cavitation performance as optimization targets, and adopting a surface element method and a CFD method to carry out optimization design on chord length distribution, pitch distribution, trim distribution, thickness distribution and camber distribution of the rotor blades so as to determine the basic geometric shape of the rotor;
taking two parameters of rotor bearing force and low-frequency line spectrum noise as optimization targets, optimally designing pitch distribution, thickness distribution and camber distribution of rotor blades by adopting a surface element method and a CFD (computational fluid dynamics) method, and determining the geometric shape of a rotor;
sixthly, the axial length L1 of the rotor and the axial distance L2 between the front end face of the rotor tip circular ring and the guide edge of the blade tip section are designed in a balanced mode according to the requirements of the tip vortex suppression effect, the propeller efficiency, the rotor rigidity and the natural frequency, and the radial thickness H of the rotor circular ring is designed in a balanced mode according to the requirements of the rotor weight, the duct strength, the rigidity and the natural frequency;
seventhly, after the geometrical shape of the tip circular ring is determined, the geometrical size of the annular groove is optimally designed, the gap between the front end face of the annular groove and the front end face of the tip circular ring is d1, the gap between the rear end face of the annular groove and the rear end face of the tip circular ring is d2, the gap between the cylindrical surface of the groove and the outer surface of the tip circular ring is d3,
firstly, according to the processing precision and the assembly precision of an impeller and a guide pipe and the jumping amplitude of a rotor shaft, the impeller is ensured not to be rubbed and collided with an annular groove in the rotating process, the minimum values of d1, d2 and d3 are determined, the influence of d1, d2 and d3 on the efficiency of a pump-jet propeller is analyzed through numerical calculation, and an optimized parameter numerical value is selected;
establishing a numerical calculation model of the underwater navigation body, the stator, the impeller, the tip ring, the guide pipe and the inner wall of the guide pipe, calculating and judging whether the hydrodynamic performance of the pump jet propeller, the thrust of the pump jet propeller, the absorbed power of the rotor and the efficiency of the pump jet propeller meet the design requirements or not, and if so, entering the algorithm (b); otherwise, the step (I) is carried out to redesign the section shape of the impeller until the design requirement is met;
ninthly, calculating the exciting force and the low-frequency line spectrum noise of the pump jet propeller by adopting a numerical calculation method, calculating and judging whether the exciting force and the low-frequency line spectrum noise of the propeller meet the design requirements, and if so, determining the geometric shape of the pump jet propeller with the final blade tip circular ring embedded into the groove of the guide pipe; if not, redesigning the side-inclined distribution of the impeller until the exciting force and the low-frequency line spectrum of the propeller meet the design requirements.
7. The method for designing a pump-jet propeller with a blade tip ring embedded in a groove of a guide pipe as claimed in claim 6, wherein the design conditions of the underwater vehicle in the step (i) include: the resistance, the navigation speed and the line type of the underwater navigation body, the installation interface of the pump jet propeller, the design rotating speed and the rated power.
8. The design method of the pump-spraying propeller with the blade tip circular ring embedded in the groove of the guide pipe as claimed in claim 6, wherein the design requirements of the underwater vehicle in the step (i) comprise: the system comprises a propeller propelling efficiency, a bearing force and a pulsating pressure of the propeller, a cavitation performance of a radiation noise propeller of the propeller, a matching type of a propeller absorption power and a propeller motor rated power, a propeller torque unbalance degree, a weight of the propeller, and a natural frequency and strength of the propeller.
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| CN113158376A (en) * | 2021-04-28 | 2021-07-23 | 中国人民解放军海军工程大学 | Vortex eliminating structure of rectangular groove on inner wall of pump jet propeller guide pipe and design and processing method |
| CN113859498A (en) * | 2021-09-17 | 2021-12-31 | 中国船舶科学研究中心 | Coating pump jet propeller capable of inhibiting tip gap vortex cavitation and coating process thereof |
| CN115924048A (en) * | 2023-02-15 | 2023-04-07 | 深海技术科学太湖实验室 | Double-layer stator type propeller with brake wing plate |
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Cited By (4)
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| CN113158376A (en) * | 2021-04-28 | 2021-07-23 | 中国人民解放军海军工程大学 | Vortex eliminating structure of rectangular groove on inner wall of pump jet propeller guide pipe and design and processing method |
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| CN115924048A (en) * | 2023-02-15 | 2023-04-07 | 深海技术科学太湖实验室 | Double-layer stator type propeller with brake wing plate |
| CN115924048B (en) * | 2023-02-15 | 2023-10-31 | 深海技术科学太湖实验室 | Double-layer stator type propeller with brake wing plate |
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