A pump casing flow channel design method and turbine pump casing

Abstract

The present invention provides a pump case flow channel design method and a turbine pump casing, wherein the pump case flow channel design method comprises: determining the throat area of ​​the pump case flow channel according to the pump impeller design parameters; allocating the areas of different characteristic cross sections of the pump case flow channel according to the throat area of ​​the pump case flow channel; wherein the pump case flow channel is a double-flanked volute structure with an inclined asymmetric characteristic cross section; calculating and drawing the characteristic dimensions of the double flow channel cross section of the pump case respectively; calculating the length of the turbine pump casing outlet diffusion section; and drawing the pump case flow channel profile. The pump case flow channel design method can reduce the complexity of the process flow and effectively reduce the production cost.

Description

Technical Field

[0001] The invention relates to the field of liquid rockets, and in particular to a pump casing flow channel design method and a turbine pump casing. Background Art

[0002] The turbopump is a core component of a liquid rocket engine, used to pressurize the propellant and deliver it to the combustion chamber. Among them, the turbopump housing is the component with the highest pressure in the turbopump, and the flow channel of the turbopump housing determines the performance and characteristics of the turbopump. The turbopump housing has a complex structure and is mainly produced by investment casting. However, this production method has a complex process flow, is difficult to control product dimensions, cannot avoid casting defects, has a long production cycle, and is usually costly.

[0003] In order to reduce the complexity of the process and reduce the production defects of the turbine pump casing, it is particularly important to design a pump casing flow channel design method and a turbine pump casing. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a pump casing flow channel design method and a turbine pump casing.

[0005] The present invention provides a pump casing flow channel design method and a turbine pump casing, comprising: determining the throat area of ​​the pump casing flow channel according to the pump impeller design parameters; allocating the areas of different characteristic cross sections of the pump casing flow channel according to the throat area of ​​the pump casing flow channel; wherein the pump casing flow channel is a double-flanked volute structure with an inclined asymmetric characteristic cross section; respectively calculating and drawing the characteristic dimensions of the double flow channel cross sections of the pump casing; calculating the length of the turbine pump casing outlet diffusion section; and drawing the pump casing flow channel profile.

[0006] According to one embodiment of the present invention, the cross section of the pump casing flow channel is an asymmetric trapezoid.

[0007] According to an embodiment of the present invention, allocating the areas of different characteristic cross-sections of the pump casing flow passage according to the throat area of ​​the pump casing flow passage includes: dividing the pump casing flow passage into equal parts along the circumferential direction of the pump casing flow passage.

[0008] According to one embodiment of the present invention, the pump casing flow channel 8 is divided into equal parts along the circumferential direction of the pump casing flow channel; Calculate the cross-sectional area of ​​the pump casing flow channel at the equally divided boundary near the turbine pump casing outlet; where F8 is the cross-sectional area of ​​the pump casing flow channel at the equally divided boundary near the turbine pump casing outlet, Q is the turbine pump flow rate, K1 is the speed coefficient, n is the turbine pump speed, D2 is the outer edge diameter of the pump impeller, b2 is the impeller pump casing outlet width, φ2 is the outlet displacement coefficient of the pump impeller, and β is the outlet angle of the pump impeller blade.

[0009] According to one embodiment of the present invention, the allocation of the areas of different characteristic cross sections of the pump casing flow channel includes: determining that the cross-sectional areas of the inner and outer ring flow channels of the pump casing at each equally divided boundary are Where, F in is the cross-sectional area of ​​the inner flow channel, φ in is the cross-sectional angle of the inner flow channel from the baffle, φ iw F is the cross-sectional angle of the outer ring flow channel from the tongue. iw is the cross-sectional area of ​​the outer ring flow channel, A is a constant, and i is the number of sections.

[0010] According to one embodiment of the present invention, the method further includes: dividing the outlet diffuser section of the turbine pump housing into equal parts along the length direction of the outlet diffuser section of the turbine pump housing; calculating the cross-sectional area at the boundary of the equal division of the outlet diffuser section of the turbine pump housing; the cross-sectional area at the boundary of the equal division of the outlet diffuser section of the turbine pump housing satisfies: In the formula, is the cross-sectional area of ​​the next flow channel, is the area of ​​the previous flow channel cross section.

[0011] According to one embodiment of the present invention, the characteristic dimensions of the double-channel cross-section of the pump casing are calculated and drawn respectively, including: the lower base length of the trapezoidal cross-section of the pump casing flow channel is b=b2+(5~10)mm, where b2 is the outlet width of the impeller pump casing; the pump casing flow channel cross-section angle is selected; and the pump casing flow channel cross-section fillet is selected.

[0012] According to one embodiment of the present invention, the length of the turbine pump housing outlet diffuser is , where L is the length of the turbine pump housing outlet diffuser, is the outlet diameter of the turbine pump housing diffuser, h8 is the height of the section of the pump housing flow channel at the equally divided boundary near the turbine pump housing outlet, is the diffusion angle of the diffusion section.

[0013] According to one embodiment of the present invention, drawing the pump casing flow channel profile line includes: the pump casing flow channel section radius increases linearly from the pump casing flow channel section near the turbine pump casing outlet to the turbine pump casing outlet section.

[0014] On the other hand, the present invention provides a turbine pump housing designed using the above-mentioned design method.

[0015] According to the pump casing flow channel design method of the present invention, the pump casing flow channel is designed to be a double-flange volute structure with an inclined asymmetric characteristic cross-section, and can be better used for 3D printing production, thereby solving the problems of high difficulty, long cycle and high cost of traditional turbine pump flow channel 3D printing process.

[0016] It should be understood that the foregoing general description and the following detailed description are merely exemplary and illustrative and are not intended to limit the scope of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The following drawings are a part of the specification of the present invention, and illustrate exemplary embodiments of the present invention. Together with the description of the specification, the accompanying drawings are used to explain the principles of the invention.

[0018] Figure 1 is a flow chart of a pump casing flow channel design method according to an embodiment of the present invention;

[0019] Figure 2 is a perspective view of a turbine pump housing according to an embodiment of the present invention;

[0020] Figure 3 is a cross-sectional view of a volute flow passage of an embodiment of the present invention;

[0021] Figure 4 is a cross section of a single-channel pump casing flow channel of an embodiment of the present invention;

[0022] Figure 5 FIG. 4 is a cross section of a double-channel volute flow passage according to an embodiment of the present invention.

[0023] Description of reference numerals:

[0024] 1—first section; 2—second section 2; 3—third section; 4—fourth section; 5—fifth section; 6—sixth section; 7—seventh section; 8—eighth section; 9—turbine pump housing outlet section; 10—gutter; 11—turbine pump housing outlet diffuser; g—printing substrate connection surface; k—turbine pump housing inlet; h—turbine pump housing outlet; f—pump housing flow channel. DETAILED DESCRIPTION

[0025] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present invention and are used to illustrate the principles of the present invention, and are not configured to limit the present invention. In addition, the structural components in the drawings are not necessarily drawn to scale. For example, the sizes of some structural components or areas in the drawings may be enlarged for other structural components or areas to help understand the embodiments of the present invention.

[0026] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the embodiments of the present invention. In the description of the present invention, it should be noted that, unless otherwise specified, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0027] In addition, the terms "include", "comprise", "have" or any other variations thereof are intended to cover non-exclusive inclusion, so that a structure or component including a series of elements includes not only those elements, but also other mechanical elements that are not explicitly listed or inherent in the structure or component. In the absence of more restrictions, the elements defined by the sentence "include..." do not exclude the existence of other identical elements in the article or device including the elements.

[0028] Spatially related terms such as "below", "beneath", "under", "low", "above", "on", "high", etc. are used to facilitate description to explain the positioning of one element relative to a second element, indicating that these terms are intended to cover different orientations of the device in addition to orientations different from those shown in the figures. In addition, for example, "one element is above / below another element" can mean that the two elements are in direct contact, or that there are other elements between the two elements. In addition, terms such as "first", "second", etc. are also used to describe various elements, regions, parts, etc., and do not specifically refer to the meaning of order or sequence, and should not be regarded as limiting. Similar terms are used throughout the description to represent similar elements.

[0029] In the process of describing the present invention below, in certain scene descriptions, only "rocket", "launch vehicle", "spacecraft", "space launch vehicle" or "missile" may be used. This is only for the convenience of description, and its connotation is not limited to the specific words used. Generally, the rocket of the present invention includes not only space launch vehicles or launch vehicles for carrying satellites or spacecraft or other probes, but also various types of missiles, rockets and other weapons for carrying military payloads, as well as similar products that can send payloads into the air. When interpreting the above specific words, those skilled in the art shall not limit the rocket to only one of the launch vehicle or missile based on the specific words used to describe the scene, thereby narrowing the scope of protection of the present invention.

[0030] For those skilled in the art, the present invention can be implemented without some of these specific details. The following description of the embodiments is only intended to provide a better understanding of the present invention by showing examples of the present invention.

[0031] Figure 1 is a flow chart of a pump casing flow channel design method according to an embodiment of the present invention; Figure 2 is a perspective view of a turbine pump housing according to an embodiment of the present invention; Figure 3 is a cross-sectional view of a volute flow passage of an embodiment of the present invention; Figure 4 is a cross section of a single-channel pump casing flow channel of an embodiment of the present invention; Figure 5 FIG. 4 is a cross section of a double-channel volute flow passage according to an embodiment of the present invention.

[0032] like Figure 1 , 2 As shown in Figure 3, the present invention provides a pump casing flow channel design method, comprising:

[0033] S01: Determine the throat area of ​​the pump casing flow channel f based on the pump impeller design parameters.

[0034] S02: According to the throat area of ​​the pump casing flow channel f, the areas of different characteristic cross sections of the pump casing flow channel f are allocated. The pump casing flow channel f is a double-flange volute structure with an inclined asymmetric characteristic cross section.

[0035] S03: Calculate the characteristic dimensions of the double-channel cross-section of the pump casing and draw them.

[0036] S04: Calculate the length of the turbine pump casing outlet diffuser 11.

[0037] S05: Draw the f-shaped line of the pump casing flow channel.

[0038] Specifically, this new design method of the pump casing flow channel can be more conveniently produced by 3D printing. Compared with traditional casting technology, 3D printing manufacturing can significantly shorten the processing cycle, reduce costs, and reduce the internal defects of the printed products, making the size control of the printed products more uniform. However, the 3D printing of the traditional turbine pump casing has the following limitations: First, the traditional rocket engine turbine pump casing flow channel (i.e., the pump casing flow channel f) is a symmetrical flow channel structure, and the end face shape of the flow channel is generally rectangular, circular or inverted trapezoidal. Due to the limitations of the pump casing flow channel structure, it is impossible to grind the support inside the flow channel to remove the support. When printing the flow channel without process support, there will be a problem of flow channel protrusion caused by epitaxial sintering and molten pool powder sticking, which makes the flow channel difficult to form, which will not only increase the scrap rate of the product, but also affect the performance of the product. Second, the traditional flow channel is in the form of a turbine pump casing, which can only be at a specific angle with the substrate during printing, and due to the large outer diameter, it is difficult to control the shrinkage deformation of the product. In addition, during the printing process, more process supports need to be added externally, which not only increases the printing time of the product, but also takes a long time to grind and remove the process supports, resulting in higher printing costs and longer product delivery cycles.

[0039] In addition, traditional rocket engines use a single-channel volute with guide vanes, calculate the throat area of ​​the casing by the velocity coefficient method, and then evenly distribute the cross-sectional area according to the circumferential angle of the cross section. This scheme uses a symmetrical cross-sectional shape, such as a circular or inverted trapezoid with enlarged fillet, the cross-sectional height is usually high, the outlet centerline is consistent with the centerline of all flow channel sections, and the outlet diffuser is longer in the axial direction (i.e., length direction).

[0040] The pump casing flow channel design method of this embodiment designs the turbine pump casing as a double-flange volute structure with an inclined asymmetric flow channel, and optimizes the form of the pump casing flow channel, so that it can actively adapt to the 3D printing process. The flow channel casing designed by this pump casing flow channel design method does not require process support, has a simple structure, is easy to control product shrinkage, and is convenient for 3D printing. In addition, by optimizing the printing scheme, the pump casing flow channel design method can simplify printing support, reduce product size, reduce product weight, increase the molding rate of the turbine pump casing, reduce production defects, ensure product quality and consistency of multiple batches of products, and contribute to mass production and quality control of products, and can shorten printing time, reduce post-processing time, and shorten production cycle. In addition, this design method can also effectively reduce production costs and achieve the purpose of reducing costs and increasing efficiency.

[0041] According to one embodiment of the present invention, the pump casing flow channel design method further includes: 3D printing the turbine pump casing.

[0042] like Figure 4 and 5 As shown, according to one embodiment of the present invention, the cross-section of the pump casing flow channel f is an asymmetric trapezoid.

[0043] Furthermore, the cross section of the pump casing flow channel f is a right-angled trapezoid.

[0044] According to one embodiment of the present invention, the areas of different characteristic cross sections of the pump casing flow channel f are allocated according to the throat area of ​​the pump casing flow channel f, including: dividing the pump casing flow channel f into equal parts along the circumferential direction of the pump casing flow channel f.

[0045] The pump casing flow channel design method of this embodiment can calculate the throat area through the design parameters and empirical parameters of the pump impeller, and calculate the cross-sections at the boundaries of the volute equally.

[0046] According to one embodiment of the present invention, the pump casing flow channel 8 is divided into equal parts along the circumferential direction of the pump casing flow channel f. Calculate the cross-sectional area of ​​the pump casing flow passage at the equally divided boundary near the outlet of the turbine pump casing. Where, F8 is the cross-sectional area of ​​the pump casing flow passage at the equally divided boundary near the outlet of the turbine pump casing, Q is the turbine pump flow rate, K1 is the speed coefficient, n is the turbine pump speed, D2 is the outer diameter of the pump impeller, b2 is the outlet width of the pump impeller casing, φ2 is the outlet displacement coefficient of the pump impeller, and β is the outlet angle of the pump impeller blade.

[0047] In this embodiment, the pump casing flow channel 8 is equally divided along the circumferential direction of the pump casing flow channel f. Along the fluid flow direction (i.e., the circumferential direction of the pump casing flow channel), there are the first section 1, the second section 2, the third section 3, the fourth section 4, the fifth section 5, the sixth section 6, the seventh section 7 and the eighth section 8 (i.e., the section of the pump casing flow channel at the equally divided boundary near the turbine pump casing outlet). The unit of F8 is m 2 , the unit of Q is m 3 / s, K1 can take the value of 0.5~0.6, the unit of n is r / min, the unit of D2 is m, the unit of b2 is m, and the unit of β is °.

[0048] According to one embodiment of the present invention, the areas of different characteristic cross sections of the pump casing flow channel f are allocated, including: determining that the cross-sectional areas of the inner circle flow channel 12 and the outer circle flow channel 13 of the pump casing at each equally divided boundary are In the formula, F in is the cross-sectional area of ​​the inner flow channel, φ in is the cross-sectional angle of the inner flow channel from the tongue 10, φ iw F is the cross-sectional angle of the outer ring flow channel 13 from the tongue 10, iw is the cross-sectional area of ​​the outer ring flow channel 13, A is a constant, and i is the number of cross-sectional areas.

[0049] The pump casing flow channel design method of this embodiment can fully consider the matching characteristics of the pump impeller and the volute, and the cross-sectional areas of the double flow channels (ie, the outer ring flow channel 13 and the inner ring flow channel 12) are calculated separately. in The unit is m 2 ,φ in The unit is °, φ iw The unit is °, F iw The unit is m 2 In formula (1), i is 1, 2, 3, ..., 8; in formula (2), i is 5, 6, 7, 8.

[0050] According to one embodiment of the present invention, along the length direction (ie, axial direction) of the turbine pump housing outlet diffuser, the cross-sectional area of ​​the turbine pump housing outlet diffuser increases linearly.

[0051] According to one embodiment of the present invention, the method further includes: dividing the turbine pump housing outlet diffuser into equal parts along the length direction of the turbine pump housing outlet diffuser; and calculating the cross-sectional area at the boundary of the turbine pump housing outlet diffuser. The cross-sectional area at the boundary of the turbine pump housing outlet diffuser (i.e., the cross-sectional area at the boundary between the eighth section 8 and the turbine pump housing outlet section 9) satisfies: In the formula, is the cross-sectional area of ​​the next flow channel, is the area of ​​the previous flow channel cross section.

[0052] In this embodiment, , The unit is m 2 .

[0053] According to one embodiment of the present invention, the characteristic dimensions of the double-flow channel cross-section of the pump housing are calculated and drawn respectively, including:

[0054] S31: The bottom length of the trapezoidal cross section of the pump casing flow channel is b = b2 + (5~10) mm. In the formula, b2 is the outlet width of the impeller pump casing.

[0055] S32: Select the pump casing flow channel cross-section angle.

[0056] S33: Select the fillet of the pump casing flow channel section.

[0057] In this embodiment, the volute flow channel does not require process support during 3D printing. The pump case flow channel cross-sectional angle α can be 35°≤α≤45°, the pump case flow channel cross-sectional fillet R can be 2mm≤R<3mm, and the fillet of the pump case flow channel can be a fixed value to better achieve unsupported 3D printing of the volute flow channel. The lower bottom length b of the trapezoidal cross section of the pump case flow channel is the length of the pump case flow channel inlet edge. The outer side e of the outer ring channel can be an arc shape.

[0058] According to one embodiment of the present invention, the length of the turbine pump housing outlet diffuser 11 is Wherein, L is the length of the turbine pump housing outlet diffuser 11, is the outlet diameter of the turbine pump housing diffuser, h8 is the height of the section of the pump housing flow channel at the equally divided boundary near the turbine pump housing outlet, is the diffusion angle of the diffusion section.

[0059] In this embodiment, the unit of L is m. The unit is m.

[0060] According to one embodiment of the present invention, drawing the pump casing flow channel f-line includes: the pump casing flow channel section radius increases linearly from the pump casing flow channel section near the turbine pump casing outlet to the turbine pump casing outlet section.

[0061] In this embodiment, the fillet of the pump casing flow passage section increases linearly from the pump casing flow passage section near the turbine pump casing outlet to the turbine pump casing outlet section, until the section transitions to a circle at the turbine pump casing outlet.

[0062] According to an embodiment of the present invention, drawing the flow channel profile of the pump casing includes: performing sweeping shaping on all cross sections.

[0063] In this embodiment, the flow field simulation of the pump casing flow channel can be performed, and the throat area can be revised according to the input operating condition parameter requirements.

[0064] In this embodiment, the bottom edge of the volute flow passage (i.e. Figure 4 and 5 The c side of the volute flow channel is kept at the same horizontal plane and connected to the printing substrate connection surface g. For example, when performing 3D printing, the bottom side c of the volute flow channel is first printed. Then the product is shrunk along the bottom side c of the volute flow channel and in a direction perpendicular to the bottom side c of the volute flow channel to control the size of the product. The pump casing flow channel design method can ensure the shape of the volute flow channel without adding process support.

[0065] According to one embodiment of the present invention,

[0066] On the other hand, the present invention provides a turbine pump housing designed using the above-mentioned design method.

[0067] In this embodiment, the inlet edge b of the pump casing flow channel, the outer edge d of the inner ring flow channel, and the outer edge e of the outer ring flow channel can be parallel to each other and perpendicular to the bottom edge c of the volute flow channel. The inclined edges of the inner ring flow channel 12 and the outer ring flow channel 13 can be collinear. The turbine pump housing outlet diffuser 11 can be inclined in the direction of the turbine pump housing inlet k so that the bottom of the turbine pump housing outlet h is basically flush with the printed substrate connection surface g. In this way, when the turbine pump housing is 3D printed, no additional support is required for the turbine pump housing outlet diffuser 11, ensuring that the process support amount of the printed substrate connection surface g is minimal. The turbine pump housing can be 3D printed with the least process support amount, which greatly simplifies the difficulty of the printing process and improves the printing quality of the product. In addition, the turbine pump housing can effectively reduce the printing time, simplify the subsequent processing procedures, effectively shorten the product production cycle, and reduce the production difficulty.

[0068] Those skilled in the art should be aware that the pump casing design method and turbine pump of the present application provide a pump casing structure with different structures, which can also be prepared using traditional production methods; when using 3D printing to prepare the pump casing, the pump casing design method of the present application can greatly reduce printing time, reduce support difficulty, simplify subsequent processing procedures, and shorten the product production cycle.

[0069] The above-mentioned embodiments of the present invention can be combined with each other and have corresponding technical effects.

[0070] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pump casing flow channel design method suitable for 3D printing, characterized in that: include: Determine the throat area of ​​the pump casing flow passage based on the pump impeller design parameters; According to the throat area of ​​the pump casing flow channel, the areas of different characteristic cross sections of the pump casing flow channel are allocated; wherein the pump casing flow channel is a double-flanked volute structure with an inclined asymmetric characteristic cross section; Calculate the characteristic dimensions of the double-channel cross-section of the pump casing and draw them; Calculate the length of the turbine pump housing outlet diffuser; Draw the flow channel profile of the pump casing; The method of allocating the areas of different characteristic cross sections of the pump casing flow channel according to the throat area of ​​the pump casing flow channel comprises: Divide the pump casing flow channel into 8 equal parts along the circumferential direction of the pump casing flow channel; according to Calculate the cross-sectional area of ​​the pump casing flow channel at the equally divided boundary near the turbine pump casing outlet; where F8 is the cross-sectional area of ​​the pump casing flow channel at the equally divided boundary near the turbine pump casing outlet, Q is the turbine pump flow rate, K1 is the speed coefficient, n is the turbine pump speed, D2 is the outer edge diameter of the pump impeller, b2 is the impeller pump casing outlet width, φ2 is the outlet displacement coefficient of the pump impeller, and β is the outlet angle of the pump impeller blade.

2. The pump casing flow channel design method according to claim 1, characterized in that: The cross section of the pump casing flow channel is an asymmetric trapezoid.

3. The pump casing flow channel design method according to claim 1, characterized in that: The distribution of the areas of different characteristic cross-sections of the pump casing flow channel includes: determining the cross-sectional areas of the inner and outer flow channels of the pump casing at each equally divided boundary as follows: Where, F in is the cross-sectional area of ​​the inner flow channel, φ in is the cross-sectional angle of the inner flow channel from the baffle, φ iw F is the cross-sectional angle of the outer ring flow channel from the tongue. iw is the cross-sectional area of ​​the outer ring flow channel, A is a constant, and i is the number of sections.

4. The pump casing flow channel design method according to claim 1, characterized in that: Also includes: Dividing the outlet diffuser section of the turbine pump housing into equal parts along the length direction of the outlet diffuser section of the turbine pump housing; Calculate the cross-sectional area at the boundary of the turbine pump housing outlet diffuser; The cross-sectional area at the boundary of the turbine pump housing outlet diffuser meets the following requirements: In the formula, is the cross-sectional area of ​​the next flow channel, is the area of ​​the previous flow channel cross section.

5. The pump casing flow channel design method according to claim 2, characterized in that: The characteristic dimensions of the double-channel cross-section of the pump casing are calculated and drawn respectively, including: The lower base length of the trapezoidal cross section of the pump casing flow channel is b = b2 + (5~10) mm, where b2 is the outlet width of the impeller pump casing; Select the pump casing flow channel cross-section angle; Select the fillet of the pump casing flow channel section.

6. The pump casing flow channel design method according to claim 1, characterized in that: The length of the turbine pump housing outlet diffuser is , where L is the length of the turbine pump housing outlet diffuser, is the outlet diameter of the turbine pump housing diffuser, h8 is the height of the section of the pump housing flow channel at the equally divided boundary near the turbine pump housing outlet, is the diffusion angle of the diffusion section.

7. The pump casing flow channel design method according to claim 1, characterized in that: The drawing of the pump casing flow channel profile includes: the fillet of the pump casing flow channel section increases linearly from the pump casing flow channel section near the turbine pump casing outlet to the turbine pump casing outlet section.

8. A turbine pump housing, characterized in that: The design is carried out using the design method described in any one of claims 1 to 7.

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