Modular design method for variable cycle core engine compressor test piece under semi-constraint

Abstract

A modular design method for a variable cycle core engine compressor test piece under semi-constraint is provided. The method is based on the configuration of a conventional cycle compressor test piece, selects a constraint interface, and fixes the typical dimensions on the constraint interface. The compressor test piece configuration is divided into multiple structural modules according to the constraint interface, and the compressor test piece structure is modularized. Then, under the constraint of the typical dimensions of the constraint interface, a variable cycle compressor test piece is obtained by replacing and upgrading the structural modules. That is, the variable cycle compressor test piece is obtained by semi-constraining the typical dimensions of the constraint interface and inheriting the main configuration of the conventional cycle compressor test piece. In this way, the variable cycle compressor test piece can be quickly constructed. In addition, within the extension range of the semi-constraint interface constraint, the coordinates of the inner and outer flow channel interfaces are fixed values to ensure a smooth transition between the combinations of the structural modules and the performance of the obtained variable cycle compressor test piece.

Description

Technical Field

[0001] The present application belongs to the field of design of compressors for aircraft engine cores, and specifically relates to a modular design method for variable cycle core compressor test pieces under semi-constraint. Background Art

[0002] The core engine is the core component of an aircraft engine. The variable cycle core engine adds a front fan in front of the compressor of the conventional cycle core engine, and adds an outer bypass bleed valve between the front fan and the compressor, that is, a core drive fan CDFS is added to adjust the inner and outer bypass air flow. An aircraft engine with a variable cycle core engine, that is, a variable cycle aircraft engine, can have the high thrust-to-weight ratio characteristics of a turbojet engine or a small bypass turbofan engine under supersonic flight through proper control. At the same time, it can have low noise and low fuel consumption characteristics under subsonic flight conditions.

[0003] The design of the core engine begins with the construction of a compressor test piece. Iterations are conducted using the test piece to ultimately determine the core engine configuration. The compressor test piece of a conventional cycle core engine mainly includes a compressor, an intake section connected to the front of the compressor, and an exhaust section connected to the rear of the compressor. When designing a variable cycle core engine, if the design of a conventional cycle core engine is used as a reference and the compressor test piece is constructed from scratch, the cycle required will be long and the cost will be high.

[0004] This application is proposed in view of the above-mentioned technical defects.

[0005] It should be noted that the disclosure of the above background technology content is only used to assist in understanding the inventive concept and technical solution of the present invention, and it does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above content has been disclosed on the filing date of this application, the above background technology should not be used to evaluate the novelty and creativity of this application. Summary of the Invention

[0006] The purpose of this application is to provide a modular design method for a variable cycle core engine compressor test piece under semi-constraint, so as to overcome or alleviate at least one of the known technical defects.

[0007] The technical solution of this application is:

[0008] A modular design method for a variable cycle core compressor test piece under semi-constraint, including:

[0009] On the conventional cycle compressor test specimen configuration, select the constraint interface, including:

[0010] Compressor front exhaust section reference plane L1;

[0011] Compressor front casing installation boundary surface L2

[0012] Compressor rotor mounting boundary surface SR1;

[0013] Typical dimensions on the fixed constraint interface include:

[0014] The bolt hole height K1 and the stopper height H1 on the L1 constraint interface;

[0015] The bolt hole height K2 and the stopper height H2 on the L2 constraint interface;

[0016] The bolt hole height SK1 and the stopper height SH1 on the SR1 constraint interface;

[0017] The conventional cycle compressor test specimen configuration is divided into multiple structural modules according to the constraint interface.

[0018] Under the constraints of the typical size of the constraint interface, the corresponding structural modules of the front fan and the outer bypass bleed valve are designed to replace the corresponding structural modules on the conventional cycle compressor configuration. Each structural module is upgraded to obtain the variable cycle compressor test piece.

[0019] According to at least one embodiment of the present application, in the modular design method of the variable cycle core compressor test piece under semi-constraint, the coordinates of the inner and outer flow channel interfaces are fixed values within the semi-constrained interface constraint extension range.

[0020] According to at least one embodiment of the present application, in the modular design method of the variable cycle core engine compressor test piece under semi-constraint, the semi-constraint interface constraint extension range is ±30 mm.

[0021] This application has at least the following beneficial technical effects:

[0022] A modular design method for a variable cycle core engine compressor test piece under semi-constraint is provided. The design is based on the configuration of a conventional cycle compressor test piece, selects a constraint interface, and fixes the typical size on the constraint interface. The compressor test piece configuration is divided into multiple structural modules according to the constraint interface, and the compressor test piece structure is modularized. Then, under the constraint of the typical size of the constraint interface, a variable cycle compressor test piece is obtained by replacing and upgrading the structural modules. That is, the typical size of the constraint interface is semi-constrained, and the main configuration of the conventional cycle compressor test piece is inherited to obtain the variable cycle compressor test piece. In this way, the variable cycle compressor test piece can be quickly constructed. In addition, within the extension range of the semi-constrained interface constraint, the coordinates of the inner and outer flow channel interfaces are fixed values to ensure a smooth transition between the combinations of the structural modules and the performance of the obtained variable cycle compressor test piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1Schematic diagram of typical dimensions of the constraint interface of a conventional cycle compressor test piece provided in an embodiment of the present application;

[0024] Figure 2 Schematic diagram of typical dimensions of the constraint interface of the variable cycle compressor test piece provided in an embodiment of the present application;

[0025] Figure 3 Schematic diagram of a variable cycle compressor test piece module assembly provided in an embodiment of the present application;

[0026] Figure 4 Schematic diagram of the rear section module of the conventional and variable cycle compressor test pieces provided in the embodiments of the present application;

[0027] Figure 5 is a schematic diagram of a CDFS fan module provided in an embodiment of the present application;

[0028] Figure 6 Schematic diagram of the rotor of the conventional cycle-changed cycle compressor test piece provided in an embodiment of the present application;

[0029] In order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. In addition, the drawings are only used for illustrative purposes and should not be understood as limitations on this patent. DETAILED DESCRIPTION

[0030] To make the technical solution and its advantages of the present application clearer, the technical solution of the present application will be described in further detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only some embodiments of the present application and are only used to explain the present application, not to limit the present application. It should be noted that, for ease of description, only the parts related to the present application are shown in the accompanying drawings, and other related parts can refer to the general design. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other to obtain new embodiments.

[0031] In addition, unless otherwise defined, the technical or scientific terms used in the description of this application should have the ordinary meanings understood by those of ordinary skill in the art to which this application belongs. The words "upper," "lower," "left," "right," "center," "vertical," "horizontal," "inner," and "outer" used in the description of this application are only used to indicate relative directions or positional relationships, and do not imply that the device or component must have a specific orientation, be constructed, or operate in a specific orientation. When the absolute position of the described object changes, its relative positional relationship may also change accordingly. Therefore, they should not be understood as limitations on this application. The words "first," "second," "third," and similar terms used in the description of this application are used only for descriptive purposes to distinguish different components and should not be understood to indicate or imply relative importance. The words "one," "an," or "the" used in the description of this application should not be understood as absolute limitations on quantity, but should be understood as meaning the presence of at least one. The words "include" or "comprises" used in the description of this application mean that the element or object listed before the word includes the elements or objects listed after the word and their equivalents, but does not exclude other elements or objects.

[0032] In addition, it should be noted that, unless otherwise clearly stipulated and limited, the words "install", "connect", "connect" and similar terms used in the description of this application should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or a connection between two components. Technical personnel in the field can understand their specific meanings in this application according to the specific circumstances.

[0033] The following is combined with Figures 1 to 6 The modular design method under semi-constraint of the variable cycle core engine compressor test piece provided in this application is further explained in detail.

[0034] The compressor test piece is modularized. Under the premise of meeting the consistency of the interface between modules, each module can be independently designed or upgraded. The semi-constrained design with the typical size of the interface as the constraint is Figure 1-2 , the conditions are as follows:

[0035] L1 is the reference plane of the front exhaust section of the compressor;

[0036] L2 is the installation boundary surface of the compressor front casing;

[0037] SR1 compressor rotor installation boundary surface;

[0038] K2 is the bolt hole height of the L2 interface, and H2 is the stop height of the L2 interface, both of which are fixed values.

[0039] SK1 is the bolt hole height of the SR1 interface, and SH1 is the stop height of the SR1 interface, both of which are fixed values.

[0040] (X i ,Y 1,i ) is the coordinate of the flow channel in the test piece i = 1, 2, 3...;

[0041] (X j ,Y 2,j ) is the outer flow channel coordinate of the test piece j = 1, 2, 3...

[0042] X i+1 -X i =1~10mm;X j+1 -X j =1~10mm;

[0043] Within the range of ±30mm between L1 and L2 interface, the flow channel coordinate (X i ,Y 1,i ) and (X j ,Y 2,j ) is fixed to ensure splicing between modules.

[0044] Replace the L1 interface of the conventional cycle compressor, the L2 interface meets the semi-constrained design requirements, and the (X i ,Y 1，i ) and (X j ,Y 2，j ) The flow path coordinates of the conventional cycle and variable cycle compressors are consistent, and the flow path design of the conventional cycle compressor is inherited to the greatest extent, such as Figure 1-2 shown.

[0045] See also Figure 3 The conventional cycle compressor test specimen M1 primarily consists of an intake module M1-1, a compressor module M1-2, and a rear section module M1-3. The compressor module M1-2 further includes a front casing and first-stage rotor module M1-2-1, a front journal structure module M1-2-2, and second- to sixth-stage modules M1-2-3. The rear section module M1-3 further includes an outlet stator conversion module M1-3-1, an outlet transition section M1-3-2 (a universal module), and an exhaust section M1-3-4 (a universal module). The module combination is premised on the L2 and SR1 interfaces meeting the semi-constrained design criteria. The transition section and exhaust section configurations can adopt those described in patent CN105971920B.

[0046] The CDFS fan module C1 is used to replace the module M1-2-1 to form the variable cycle compressor component module CM1, which is matched with the air intake casing module C2. The rear section module M1-3 of the original test piece is used to form the variable cycle compressor test piece CM2.

[0047] The variable cycle compressor component module CM1 consists of three main structural modules: the front casing assembly C1-1 with ducted bleed function, the rear casing assembly CM1-1, and the rotor assembly N1 with a front fan. Figure 3 shown.

[0048] The rear section module M1-3 of the test piece is a fixed module, which consists of M1-3-1 four-stage outlet stator conversion module, M1-3-2 outlet transfer section module, M1-3-3 high-pressure shaft and M1-3-4 exhaust section, as shown in the figure. Figure 4 shown.

[0049] The CDFS fan module C1 is a replacement functional module, which consists of three structural modules: the C1-1 front casing module with ducted air structure, the front rotor module C1-3 consisting of CDFS fan + 1-stage rotor, and the front journal dedicated module C1-2. Figure 5 shown.

[0050] The rotor of the conventional cycle compressor test piece consists of a 1-stage rotor structure module CM3, a front journal structure module CM2, a 2-stage rotor module CM4, 3-6 stage rotor modules CM5, a high-pressure shaft structure module CM6, an intake section front support CM1, and an exhaust section (universal module) rear support CM7. Figure 6 shown.

[0051] The variable cycle compressor test piece rotor function module consists of CDFS fan + high-pressure 1st stage rotor module (special module) N3, front journal special module N1-2, 2nd stage rotor module CM4, 3rd to 6th stage rotor modules CM5, high-pressure shaft structure module CM6, intake section (special function module) front support point N1-1, exhaust section (general module) rear support point CM7. Among them, the N3 module can be a welded or integral blade disk structure. The 1st stage rotor uses the original blade shape parameters, and the 2nd stage rotor and the rest use the conventional rotor structure, forming a compressor rotor configuration with the diversion effect of a single-stage cantilever fan, such as Figure 6 shown.

[0052] The modular design method of the variable cycle core engine compressor test piece under semi-constraint disclosed in the above embodiment is based on the conventional cycle compressor test piece, takes semi-constraint as the design principle, and forms a variable cycle compressor test piece through module replacement and combination. Only related structures such as the CDFS casing, front rotor, front shaft neck and intake section are added. The remaining structures can adopt the conventional cycle compressor test piece modules, which can shorten the construction period of the cycle core engine compressor test piece and reduce the development cost.

[0053] So far, the technical solution of the present application has been described in conjunction with the preferred embodiments shown in the accompanying drawings. Those skilled in the art should understand that the scope of protection of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art can make equivalent changes or replacements to the relevant technical features, and the technical solutions after these changes or replacements will fall within the scope of protection of the present application.

Claims

1. A modular design method for a variable cycle core compressor test piece under semi-constraint, characterized in that: include: On the conventional cycle compressor test specimen configuration, select the constraint interface, including: Compressor front exhaust section reference plane L1; Compressor front casing installation boundary surface L2 Compressor rotor mounting boundary surface SR1; Typical dimensions on the fixed constraint interface include: The bolt hole height K1 and the stopper height H1 on the L1 constraint interface; The bolt hole height K2 and the stopper height H2 on the L2 constraint interface; The bolt hole height SK1 and the stopper height SH1 on the SR1 constraint interface; The conventional cycle compressor test specimen configuration is divided into multiple structural modules according to the constraint interface. Under the constraints of the typical size of the constraint interface, the corresponding structural modules of the front fan and the outer bypass bleed valve are designed to replace the corresponding structural modules on the conventional cycle compressor configuration. Each structural module is upgraded to obtain the variable cycle compressor test piece.

2. The modular design method for a variable cycle core compressor test piece under semi-constraint according to claim 1 is characterized in that: Within the extension range of the semi-constrained interface constraint, the coordinates of the inner and outer flow channel interfaces are fixed values.

3. The modular design method for a variable cycle core compressor test piece under semi-constraint according to claim 2 is characterized in that: The semi-constrained interface constraint extension range is ±30mm.

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