Inducer and turbine pump

Abstract

The embodiment of the present application provides an inducer and a turbopump, which are used for further improving the cavitation erosion resistance of the inducer. The inducer is suitable for a liquid rocket engine, and the inducer comprises a rotating shaft and blades fixed to the rotating shaft; a first development surface corresponding to the blades comprises a first region, and a part of the first development surface located in the first region is in a curve shape; the first development surface is a planar pattern obtained by unfolding a first section surface of the blades which is cut by a cylindrical surface of the rotating shaft on a shaft radius. The inducer and the turbopump provided by the embodiment of the present application can further improve the cavitation erosion resistance of the inducer.

Description

Technical Field

[0001] This application relates to the field of liquid rocket engine technology, and more specifically, to an inducer wheel and a turbopump. Background Technology

[0002] In the turbopump of a cryogenic liquid rocket engine, the inducer is installed before the impeller inlet of the centrifugal pump to increase the pressure at the impeller inlet and improve the centrifugal pump's resistance to cavitation erosion. An important parameter affecting the inducer's resistance to cavitation erosion is the blade cascade density (which can be expressed as the ratio of chord length to pitch). A higher blade cascade density ensures that cavitation bubbles (also called voids) at the blade leading edge have sufficient time to disappear under flow channel pressure, reducing vibrations caused by cavitation collapse and preventing the inducer surface material from peeling off due to impact and fatigue, thereby improving cavitation erosion resistance.

[0003] However, in related technologies, the inducer still experiences strong vibrations due to cavitation, and its anti-cavitation performance needs further improvement. Summary of the Invention

[0004] This application addresses the shortcomings of related technologies by proposing an inducer and a turbine pump to further improve the cavitation resistance of the inducer.

[0005] In a first aspect, embodiments of this application provide an inducer wheel suitable for liquid rocket engines, comprising: a rotating shaft, and blades fixed to the rotating shaft;

[0006] The first unfolded surface corresponding to the blade includes a first region, and the portion of the first unfolded surface located in the first region is curved; the first unfolded surface is the following planar figure: the first cross-section obtained by the blade being cut off by the cylindrical surface of the rotating shaft at the axial radius, which is unfolded into a planar figure.

[0007] In one possible implementation, the first unfolded surface includes: an inlet section near the inlet of the inducer wheel, an outlet section near the outlet of the inducer wheel, and an intermediate section located between the inlet section and the outlet section;

[0008] The first region is located in the middle section, and the inlet section and the outlet section are straight along a first straight line; the first straight line is consistent with the extension direction of the blade cascade of the straight-type constant pitch inducer.

[0009] In one possible implementation, the first region includes at least one S-shaped sub-region.

[0010] In one possible implementation, any of the S-shaped sub-regions is a centrally symmetric figure, and the center of symmetry of all the S-shaped sub-regions lies on the first straight line.

[0011] In one possible implementation, the curvature of the first region includes a periodic curvature, which includes a shape conforming to a first sine curve; the horizontal axis of the first sine curve coincides with the first straight line.

[0012] In one possible implementation, the first sine curve has a first amplitude, the first amplitude ranging from 0.1 to 0.2 times the blade rim diameter; and / or,

[0013] The first sine curve has a first period, which ranges from 0.3 to 1 times the pitch of the inducer.

[0014] In one possible implementation, the first unfolded surface includes: an inlet section near the inlet of the inducer wheel, an outlet section near the outlet of the inducer wheel, and an intermediate section located between the inlet section and the outlet section;

[0015] The first region completely covers the entrance section, the middle section, and the exit section.

[0016] In one possible implementation, the first region includes multiple sub-regions; in any two adjacent sub-regions, the tail of the preceding sub-region is connected to the head of the following sub-region; all the sub-regions are S-shaped or arc-shaped.

[0017] In one possible implementation, the first region includes multiple sub-regions; in any two adjacent sub-regions, the tail of the preceding sub-region is connected to the head of the following sub-region; in two adjacent sub-regions, one is S-shaped, wavy, or arc-shaped, and the other is straight.

[0018] Secondly, embodiments of this application provide a turbopump suitable for liquid rocket engines, comprising: a centrifugal pump, and an inducer as described above; the outlet of the inducer is directly opposite the inlet of the centrifugal pump.

[0019] The beneficial technical effects of the technical solutions provided in this application include:

[0020] The inducer wheel includes a rotating shaft and blades fixed to the rotating shaft. The first unfolded surface of the blades includes a first region, which is curved. The first unfolded surface is a planar shape formed by unfolding the first cross-section of the blade, which is cut off by the cylindrical surface of the rotating shaft at the shaft radius. Compared with the linear first unfolded surface of the blades in related technologies, the first unfolded surface of the blades in this embodiment includes a curved first region. Since the length of the curved segment between two points is greater than the length of the straight segment, the path length of the liquid in the inducer wheel can be extended, ensuring that cavitation bubbles in the liquid have enough time to disappear, reducing the cavitation content in the liquid output by the inducer wheel, weakening the vibration caused by cavitation collapse, and improving cavitation resistance.

[0021] Additional aspects and advantages of this application will be set forth in part in the description which follows, and will become apparent from the description or may be learned by practice of this application. Attached Figure Description

[0022] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0023] Figure 1 This is a schematic diagram of the structure of an inducer wheel provided in an embodiment of this application;

[0024] Figure 2 for Figure 1 The diagram shows the structure after the inducer wheel is cut to form the first cross-section.

[0025] Figure 3 for Figure 2 A schematic diagram of the structure in which the middle cylindrical surface is unfolded to obtain the first rectangle, and the first cross-section is unfolded to obtain the first unfolded surface;

[0026] Figure 4 This is a schematic diagram of another inducer provided in an embodiment of this application;

[0027] Figure 5 for Figure 4 The diagram shows the structure after the inducer wheel is cut to form the first cross-section.

[0028] Figure 6 for Figure 5 A schematic diagram of the structure in which the middle cylindrical surface is unfolded to obtain the first rectangle, and the first cross-section is unfolded to obtain the first unfolded surface;

[0029] Figure 7 A schematic diagram of the structure of the first rectangle and another first unfolded surface provided in the embodiments of this application;

[0030] Figure 8A schematic diagram of the structure of a first rectangle and another first unfolded surface provided in an embodiment of this application;

[0031] Figure 9 This is a schematic diagram of a first rectangle and a first unfolded surface provided in an embodiment of this application.

[0032] Figure label:

[0033] 11 - Rotation axis; r - Axial radius of rotation axis; 111 - First rectangle formed by unfolding the cylindrical surface; C - Circumference of the cylindrical surface of rotation axis; OO' - Axial direction of rotation axis;

[0034] 12-blade;

[0035] 121 - First development surface; 121a - Inlet section; 121b - Outlet section; 121c - Intermediate section; L - First straight line;

[0036] S1 - First section; S11 - First part; S12 - Second part; S13 - Third part;

[0037] β-placement angle

[0038] H1 - First sub-region; H2 - Second sub-region. Detailed Implementation

[0039] The embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the embodiments described below with reference to the accompanying drawings are exemplary descriptions for explaining the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions of the embodiments of this application.

[0040] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the word “comprising” as used in the specification of this application means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude other features, information, data, steps, operations, elements, components, and / or combinations thereof supported by the art. The term “and / or” as used herein refers to at least one of the items defined by the term; for example, “A and / or B” can be implemented as “A,” or as “B,” or as “A and B.”

[0041] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0042] Cavitation is a vaporization phenomenon that occurs in mechanical equipment using a liquid as the medium. Vaporization typically takes two forms: when any liquid is heated under constant pressure, it begins to vaporize when its temperature rises to a certain point, forming bubbles (also called cavitation bubbles), a process known as boiling; when the liquid temperature is constant and the pressure drops to a certain critical pressure, the liquid will also vaporize. When cavitation bubbles flow with the liquid to a higher pressure area, the vapor inside the bubbles recondenses, and the cavitation bubbles collapse. Accompanying the formation, development, and collapse of cavitation bubbles are a series of physical and chemical changes. This process of cavitation formation, development, and collapse within a liquid flow due to pressure changes, and the resulting series of physical and chemical changes, is called cavitation.

[0043] After a cavitation bubble collapses, a series of complex physicochemical phenomena occur. For example, when a cavitation bubble collapses near the impeller channel wall, the surrounding liquid continuously impacts the impeller channel surface at an extremely high frequency, causing the surface material to peel off due to impact and fatigue. If the cavitation bubble contains certain reactive gases, these gases, aided by the heat generated during cavitation condensation, electrochemically corrode the surface material, further accelerating the peeling process and damaging the flow surface. This phenomenon of damage to the flow surface material due to cavitation bubble collapse is called cavitation erosion.

[0044] In the turbopump of a cryogenic liquid rocket engine, the inducer is installed before the impeller inlet of the centrifugal pump to increase the pressure at the impeller inlet and improve the centrifugal pump's resistance to cavitation erosion. An important parameter affecting the inducer's resistance to cavitation erosion is the blade cascade density (which can be expressed as the ratio of chord length to pitch, where chord length is the projected length of the blade profile on the chord line, and pitch is the circumferential distance between two adjacent blade profiles). A higher blade cascade density ensures that cavitation bubbles (also called voids) at the blade leading edge have sufficient time to disappear under flow channel pressure, reducing vibrations caused by cavitation collapse and preventing the inducer surface material from peeling off due to impact and fatigue, thereby improving cavitation erosion resistance.

[0045] However, in related technologies, the inducer still experiences strong vibrations due to cavitation, and its anti-cavitation performance needs further improvement.

[0046] The inducer and turbine pump provided in this application are intended to solve the above-mentioned technical problems in related technologies.

[0047] The technical solution of this application and how it solves the above-mentioned technical problems are described in detail below with specific embodiments. It should be noted that the following embodiments can be referenced, borrowed, or combined with each other, and the same terms, similar features, and similar implementation steps in different embodiments will not be described again.

[0048] This application provides an inducer wheel suitable for liquid rocket engines. See [link / reference] Figure 1 , Figure 4 The inducer wheel includes a rotating shaft 11 and blades 12 fixed to the rotating shaft 11.

[0049] See Figure 3 , Figures 6 to 9 The first unfolded surface 121 corresponding to the blade 12 includes a first region, and the part of the first unfolded surface 121 located in the first region is curved. The first unfolded surface 121 is the following planar figure: the first cross-section S1 obtained by the blade 12 being cut off by the cylindrical surface of the rotating shaft 11 on the axial radius r, and unfolded into a planar figure.

[0050] In other words, the first unfolded surface 121 is the following planar figure: the rotating shaft 11 is cylindrical, and the contact area between the blade 12 and the side of the rotating shaft 11 is the planar figure obtained by unfolding the side of the rotating shaft 11 into a plane.

[0051] See Figure 3 , Figures 6 to 9 The first section S1 can be understood as the contact area between the blade 12 and the side of the rotating shaft 11. The cylindrical surface of the rotating shaft 11 is cut along a straight line parallel to the axial direction and unfolded into a first rectangle 111. The first section S1 is then unfolded into a first unfolded surface 121. The width of the first rectangle 111 is the circumference C of the cylindrical surface of the rotating shaft 11.

[0052] In practical applications, the first unfolded surface 121 is elongated (it can be a curved elongated surface), and the first region is a segment of the elongated first unfolded surface 121.

[0053] Compared to the linear design of the first unfolded surface 121 of the blade 12 in related technologies, the first unfolded surface 121 of the blade 12 in this embodiment includes a curved first region. Since the length of the curved segment between two points is greater than the length of the straight segment, the path length of the liquid in the inducer can be extended, ensuring that the cavitation bubbles in the liquid have enough time to disappear, reducing the content of cavitation bubbles in the liquid output by the inducer, weakening the vibration caused by cavitation bubble collapse, and improving the anti-cavitation performance.

[0054] Optionally, see Figures 1 to 3 In this embodiment, the first unfolded surface 121 includes: an inlet section 121a near the inlet of the inducer wheel, an outlet section 121b near the outlet of the inducer wheel, and an intermediate section 121c located between the inlet section 121a and the outlet section 121b.

[0055] The first region is located in the middle section 121c, and the inlet section 121a and the outlet section 121b are straight along the first straight line L; the first straight line L is consistent with the extension direction of the blade cascade of the straight-type constant pitch inducer.

[0056] Figure 3 This is a schematic diagram of the first type of structure with the first unfolded surface 121. Figure 2 and Figure 3 In the first unfolded surface 121, the inlet section 121a, the outlet section 121b, and the middle section 121c correspond to the first part S11, the second part S12, and the third part S13 of the first cross-section S1, respectively.

[0057] See Figure 3 , Figures 6 to 9 Since the angle between the blade cascade of the straight-line constant pitch inducer and the axial direction of the rotating shaft 11 is the placement angle β, the angle between the first straight line L and the axial direction OO' of the rotating shaft 11 is the placement angle β.

[0058] Because the inlet and outlet sections are aligned with the blade cascades of a straight, equal-pitch inducer, the stability of the liquid flow in the inlet and outlet sections is ensured, preventing excessive turbulence in the liquid flow. Furthermore, the curved shape of the middle section ensures sufficient time for cavitation bubbles in the liquid to dissipate, reducing the cavitation content in the liquid output by the inducer. This, in turn, ensures both the stability of the liquid flow in the inlet and outlet sections and improves cavitation resistance.

[0059] Optionally, the first region may include at least one S-shaped sub-region. Here, the S-shape can be understood as two arcs with opposite curvature directions connected together.

[0060] In this embodiment, the first region may include at least two S-shaped sub-regions, with the tail of the first S-shaped sub-region connected to the head of the second S-shaped sub-region. In other words, the middle section of the first unfolded surface 121 is wavy, the inlet and outlet sections of the first unfolded surface 121 are straight along the first straight line L, and the two ends of the wavy middle section are connected to the inlet and outlet sections respectively.

[0061] Of course, the first region may also include an S-shaped sub-region. In other words, the middle section of the first unfolded surface 121 is S-shaped, the entrance and exit sections of the first unfolded surface 121 are straight along the first straight line L, and the two ends of the middle section of the S-shape are connected to the entrance and exit sections respectively.

[0062] Optionally, see Figure 3 In this embodiment, each S-shaped sub-region is a centrally symmetrical figure, and the center of symmetry of all S-shaped sub-regions is located on the first straight line L. This arrangement better conforms to the flow trend of the liquid, facilitating smooth inflow and outflow of the liquid.

[0063] In other words, for the middle section of the first unfolded surface 121, the symmetry center of all S-shaped sub-regions is located on the straight line of the blade cascade of the straight-line constant pitch inducer; the inlet and outlet sections of the first unfolded surface 121 are consistent with the blade cascade of the straight-line constant pitch inducer.

[0064] Optionally, the portion of the first unfolded surface 12 located in the first region may have a periodically curved shape, which may include a shape conforming to a first sine curve; the horizontal axis of the first sine curve coincides with the first straight line L. In other words, the periodically curved shape has a shape represented by the first sine curve.

[0065] Assuming the first sine curve is y = asinbx, then the first expansion surface 121 satisfies the following relationship:

[0066]

[0067] Wherein, the x-axis of the first sine curve is the first straight line L, and the y-axis of the first sine curve is the direction perpendicular to the x-axis. 'a' is the amplitude of the first sine curve, representing the maximum distance between the first unfolded surface 121 and the first straight line L. 'b' = 2π / T, where T is the period of the first sine curve. 'p' represents the starting coordinates of the first sine curve, which can be set according to actual needs, for example...

[0068] In practical applications, the first sine curve has a first amplitude, which can range from 0.1 to 0.2 times the rim diameter of the blade 12; and / or, the first sine curve has a first period, which can range from 0.3 to 1 times the pitch of the inducer.

[0069] In other words, the first amplitude 'a' ranges from (0.1 to 0.2)Dy, where Dy is the rim diameter of blade 12. The value of 'b' ranges from 2π / s to 6π / s, where s is the pitch of the inducer wheel.

[0070] This configuration not only extends the path length of the liquid in the inducer and reduces the cavitation content in the liquid output by the inducer, but also avoids abrupt changes in the flow field caused by an excessively large first amplitude or a too small first period, which would affect the flow stability.

[0071] Optionally, see Figures 4 to 9 In another feasible embodiment, the first unfolded surface 121 includes: an inlet section near the inlet of the inducer wheel, an outlet section near the outlet of the inducer wheel, and an intermediate section located between the inlet section and the outlet section; the first region completely covers the inlet section, the intermediate section and the outlet section.

[0072] By setting the inlet, middle, and outlet sections to be curved, the path length of the liquid in the inducer can be maximized, ensuring that cavitation bubbles in the liquid have enough time to disappear.

[0073] In other words, the inlet, middle and outlet sections of the first unfolded surface 121 adopt the same curved shape, which is the same as the curvature of the first region.

[0074] Optionally, the first region may include multiple sub-regions; in any two adjacent sub-regions, the tail of the preceding sub-region is connected to the head of the following sub-region; all sub-regions are S-shaped or arc-shaped. An S-shape can be understood as two arcs with opposite curvature directions connected together.

[0075] Correspondingly, the first unfolded surface 121 includes multiple sub-regions; in any two adjacent sub-regions, the tail of the previous sub-region is connected to the head of the next sub-region; all sub-regions are S-shaped or arc-shaped.

[0076] Figure 6 This is a schematic diagram of the second type of first unfolded surface 121. Figure 6 In the diagram, all sub-regions are S-shaped, and in any two adjacent S-shaped sub-regions, the tail of the first S-shaped sub-region is connected to the head of the second S-shaped sub-region.

[0077] For example, the bending shape of the first unfolded surface 121 may include a periodic bending shape, which may conform to a first sine curve. In this case, the first unfolded surface 121 satisfies the following relationship: y = asinbx. Where the x-axis is the first straight line L, and the direction perpendicular to the x-axis is the y-axis. a is the amplitude of the first sine curve, representing the maximum distance between the first unfolded surface 121 and the first straight line L. b = 2π / T, where T is the period of the first sine curve.

[0078] Of course, all sub-regions can also be arc-shaped, with all arcs curving in the same direction, and the tail of the previous arc connecting to the head of the next arc.

[0079] See Figures 7 to 9 In practical applications, the first unfolded surface 121 may include multiple sub-regions; in any two adjacent sub-regions, the tail of the first sub-region is connected to the head of the second sub-region; in two adjacent sub-regions (first sub-region H1 and second sub-region H2), the first sub-region H1 is S-shaped, wavy, or arc-shaped, and the second sub-region H2 is straight.

[0080] In this context, a wave-like shape can be understood as at least two S-shaped sub-regions connected together, meaning the tail of one S-shaped sub-region is connected to the head of the next S-shaped sub-region. It should be noted that a wave-like shape can also be an S-shaped sub-region connected to an arc-shaped sub-region, for example, a sine wave with 1.5 cycles.

[0081] Figure 7 This is a schematic diagram of the third type of first unfolded surface 121. Figure 7 In this configuration, the tail of the first S-shaped sub-region H1 is connected to the head of the second linear sub-region H2. That is, the first S-shaped sub-region H1 and the second linear sub-region H2 are alternately connected.

[0082] Figure 8 This is a schematic diagram of the fourth type of first unfolded surface 121. Figure 8 In this pattern, the tail of the first wavy sub-region H1 connects to the head of the second linear sub-region H2. That is, the wavy first sub-region H1 and the linear second sub-region H2 are alternately connected.

[0083] Figure 8 Taking the wavy shape as an example of connecting two S-shaped sub-regions, in practical applications, a wavy shape can be understood as connecting at least two S-shaped sub-regions. It should be noted that a wavy shape can also be a connection between an S-shaped sub-region and an arc-shaped sub-region.

[0084] Figure 9 This is a schematic diagram of the fifth type of first unfolded surface 121. Figure 9 In this configuration, the tail of the first arc-shaped sub-region H1 connects to the head of the second straight sub-region H2. That is, the arc-shaped first sub-region H1 and the straight second sub-region H2 are alternately connected. Optionally, two adjacent arc-shaped first sub-regions H1 have opposite curvature directions.

[0085] It is understandable that for a scheme where the first region is located in the middle section and both the entrance and exit sections are straight, the first region can include not only at least one S-shaped sub-region, but also the aforementioned configuration, which will not be repeated here.

[0086] The beneficial technical effects of the technical solutions provided in this application include:

[0087] The inducer wheel includes a rotating shaft 11 and blades 12 fixed to the rotating shaft 11. The first unfolded surface 121 of the blades 12 includes a first region, which is curved. The first unfolded surface 121 is a planar shape formed by unfolding the first cross-section of the blades 12, which is cut off by the cylindrical surface of the rotating shaft 11 at the axial radius r. Compared with the related art where the first unfolded surface 121 of the blades 12 is straight, in this embodiment, the first unfolded surface 121 of the blades 12 includes a curved first region. Since the length of the curved segment between two points is greater than the length of the straight segment, the path length of the liquid in the inducer wheel can be extended, ensuring that the cavitation bubbles in the liquid have enough time to disappear, reducing the cavitation content in the liquid output by the inducer wheel, weakening the vibration caused by cavitation collapse, and improving the anti-cavitation performance.

[0088] Based on the same inventive concept, this application provides a turbopump suitable for liquid rocket engines, comprising: a centrifugal pump, and an inducer as described above; the outlet of the inducer is directly opposite the inlet of the centrifugal pump.

[0089] Compared to the linear first development surface of the blades of the inducer in related technologies, the first development surface of the blades of the inducer in this embodiment includes a curved first region. Since the length of the curved segment between two points is greater than the length of the straight segment, the path length of the liquid in the inducer can be extended, ensuring that the cavitation bubbles in the liquid have enough time to disappear, reducing the cavitation content in the liquid output by the inducer, weakening the vibration caused by cavitation collapse, and improving the anti-cavitation performance.

[0090] Those skilled in the art will understand that the steps, measures, and solutions in the various operations, methods, and processes discussed in this application can be alternated, modified, combined, or deleted. Furthermore, other steps, measures, and solutions in the various operations, methods, and processes discussed in this application can also be alternated, modified, rearranged, decomposed, combined, or deleted. Furthermore, steps, measures, and solutions in related technologies that are similar to those disclosed in this application can also be alternated, modified, rearranged, decomposed, combined, or deleted.

[0091] In the description of this application, the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate directions or positional relationships based on the exemplary directions or positional relationships shown in the accompanying drawings. They are used to facilitate the description or simplification of the embodiments of this application and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0092] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0093] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0094] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0095] It should be understood that although the steps in the flowcharts of the accompanying drawings are shown sequentially according to the arrows, the order in which these steps are implemented is not limited to the order indicated by the arrows. Unless explicitly stated herein, in some implementation scenarios of this application, the steps in each process can be executed in other orders as required. Moreover, some or all of the steps in each flowchart may include multiple sub-steps or multiple stages based on the actual implementation scenario. Some or all of these sub-steps or stages may be executed at the same time or at different times. In scenarios where the execution times are different, the execution order of these sub-steps or stages can be flexibly configured according to requirements, and this application does not limit this.

[0096] The above description is only a partial implementation of this application. It should be noted that for those skilled in the art, other similar implementation methods based on the technical concept of this application, without departing from the technical concept of this application, also fall within the protection scope of the embodiments of this application.

Claims

1. An inducer wheel suitable for liquid rocket engines, characterized in that, include: A rotating shaft, and blades fixed to the rotating shaft; The first unfolded surface corresponding to the blade includes a first region, and the portion of the first unfolded surface located in the first region includes a curved portion; the first unfolded surface is the following planar figure: the first cross-section obtained by the blade being cut off at the axial radius by the cylindrical surface of the rotating shaft, which is unfolded into a planar figure; the first region includes at least one S-shaped sub-region, wherein the S-shape is two arcs with opposite curvature directions connected together.

2. The inducer wheel according to claim 1, characterized in that, The first unfolded surface includes: an inlet section near the inlet of the inducer wheel, an outlet section near the outlet of the inducer wheel, and an intermediate section located between the inlet section and the outlet section; The first region is located in the middle section, and the inlet section and the outlet section are straight along a first straight line; the first straight line is consistent with the extension direction of the blade cascade of the straight-type constant pitch inducer.

3. The inducer wheel according to claim 2, characterized in that, Each of the S-shaped sub-regions is a centrally symmetric figure, and the center of symmetry of all the S-shaped sub-regions is located on the first straight line.

4. The inducer wheel according to claim 3, characterized in that, The bending shape of the first region includes a periodic bending shape, which includes a shape conforming to a first sine curve; the horizontal axis of the first sine curve coincides with the first straight line.

5. The inducer wheel according to claim 4, characterized in that, The first sine curve has a first amplitude, which ranges from 0.1 to 0.2 times the blade rim diameter; and / or, The first sine curve has a first period, which ranges from 0.3 to 1 times the pitch of the inducer.

6. The inducer wheel according to claim 1, characterized in that, The first unfolded surface includes: an inlet section near the inlet of the inducer wheel, an outlet section near the outlet of the inducer wheel, and an intermediate section located between the inlet section and the outlet section; The first region completely covers the entrance section, the middle section, and the exit section.

7. The inducer wheel according to claim 2 or 6, characterized in that, The first region includes multiple sub-regions; in any two adjacent sub-regions, the tail of the previous sub-region is connected to the head of the next sub-region; all the sub-regions are S-shaped.

8. The inducer wheel according to claim 2 or 6, characterized in that, The first region includes multiple sub-regions; in any two adjacent sub-regions, the tail of the first sub-region is connected to the head of the second sub-region; in two adjacent sub-regions, one is S-shaped and the other is straight.

9. A turbopump suitable for liquid rocket engines, characterized in that, include: A centrifugal pump, and an induced draft wheel as described in any one of claims 1-8; The outlet of the inducer is directly opposite the inlet of the centrifugal pump.

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