CN115059635A

CN115059635A - Pneumatic probe three-dimensional movement mechanism for testing axial flow compressor

Info

Publication number: CN115059635A
Application number: CN202210741910.XA
Authority: CN
Inventors: 王春雪; 陈绍文; 杜云逸; 巩赟; 李伟航
Original assignee: Harbin Institute of Technology; Beijing Power Machinery Institute
Current assignee: Harbin Institute of Technology; Beijing Power Machinery Institute
Priority date: 2022-06-27
Filing date: 2022-06-27
Publication date: 2022-09-16

Abstract

The invention relates to a three-dimensional movement mechanism of a pneumatic probe for an axial flow compressor test, and belongs to the technical field of wind tunnel tests. The problem of large-angle range pneumatic parameter measurement is solved. The device comprises a gear ring, a gear, a blade cascade, a motor, a probe and a bearing, wherein the motor is fixed on the outer wall of the blade cascade, the gear is arranged at the output end of the motor, the gear ring is connected with the outer wall of the blade cascade through the bearing and is meshed with the gear ring, the gear ring is connected with the probe, and the probe extends into a flow channel of the blade cascade. On the basis of guaranteeing the stable operation of pneumatic probe, realize wider pneumatic probe circumference regulation and control angle promptly, satisfy wide-angle range pneumatic parameter's measurement to this accuracy and the precision that promotes experimental test.

Description

Pneumatic probe three-dimensional movement mechanism for testing axial flow compressor

Technical Field

The invention relates to a three-dimensional movement mechanism of a pneumatic probe for an axial flow compressor test, and belongs to the technical field of wind tunnel tests.

Background

The axial-flow compressor is one of important parts of an aviation turbojet engine and a gas turbine, and the performance of the axial-flow compressor is a key related to whether the aviation turbojet engine and the gas turbine can work efficiently and stably. Three methods are commonly used for scientific research on the aerodynamic performance and the flow field of the axial flow compressor, including a theoretical research method, a numerical calculation research method and a wind tunnel test research method, wherein the wind tunnel test method is the primary research means for testing the aerodynamic performance of the axial flow compressor and researching the flow mechanism of the axial flow compressor, and the obtained test data is also the basis for constructing various simulation models for design calculation, such as a loss model, an attack angle model, a clearance flow model and the like.

In the cascade test and the modeling test of the compressor part, in order to meet the requirements of flow field and performance analysis on test data, a pneumatic probe is inevitably adopted to measure flow field parameters, and as the pneumatic probe is rod-shaped and has small mass, corresponding motion support needs to be provided for parameter measurement at different positions, and controllable motion of the pneumatic probe in the circumferential direction, the axial direction, the radial direction and the probe axis direction can be realized, so that the accuracy and precision of the test are ensured. For example, the publication number is CN112539913A, the invention provides a coordinate displacement mechanism for a fan-shaped cascade experiment flow field test, and the technical scheme is that a test probe is fixed on an axial coordinate displacement mechanism, and the axial coordinate displacement mechanism drives the test probe to perform transverse reciprocating linear movement; the axial coordinate displacement mechanism is driven by the radial coordinate displacement mechanism sliding block to do longitudinal reciprocating linear movement; the rotary coordinate displacement mechanism drives the radial coordinate displacement mechanism to carry out reciprocating rotary motion in the circumferential direction; the center seeking coordinate displacement mechanism drives the rotating coordinate displacement mechanism to perform longitudinal reciprocating linear movement. However, the following disadvantages also exist:

1. the device can only test the fan-shaped blade cascade (namely the local part of the annular blade cascade) and is not suitable for the experimental test of the annular blade cascade, namely the measurement of the pneumatic parameters in a large angle range;

2. the circumferential rotation displacement device of the device is positioned at the center, and the circumferential rotation displacement device is subjected to large torque in the moving process and can face the problems of low circumferential angle adjustment precision and/or probe jitter in the testing process;

3. the device can only test the data of the experiment outlet, and is limited to be used under the condition that the internal data of the experimental piece needs to be collected.

Therefore, it is desirable to provide a three-dimensional motion mechanism for a pneumatic probe for an axial flow compressor test to solve the above technical problems.

Disclosure of Invention

The invention aims to solve the problem of measuring the pneumatic parameters in a large angle range. The following presents a simplified summary of the invention in order to provide a basic understanding of some aspects of the invention. It should be understood that this summary is not an exhaustive overview of the invention. It is not intended to identify key or critical elements of the invention or to delineate the scope of the invention.

The technical scheme of the invention is as follows:

a three-dimensional movement mechanism of a pneumatic probe for testing an axial flow compressor comprises a gear ring, a gear, a blade grid, a motor, a probe and a bearing, wherein the motor is fixed on the outer wall of the blade grid, the gear is arranged at the output end of the motor, the gear ring is connected with the outer wall of the blade grid through the bearing, the gear is meshed with the gear ring, the gear ring is connected with the probe, and the probe extends into a flow channel of the blade grid.

Preferably: the blade cascade is an annular blade cascade or a fan-shaped blade cascade.

Preferably: the mounting frame is arranged on the gear ring, a sliding groove is formed in the mounting plate, the positioning bolt penetrates through the sliding groove to be connected with the mounting frame, and a probe is arranged at one end of the mounting plate.

Preferably: the output end of the motor is connected with the gear through the speed reducer.

Preferably, the following components: the blade cascade is provided with a test hole, and the probe penetrates through the test hole and extends into the cavity of the blade cascade.

Preferably: the number of the sliding grooves is two;

preferably: still include step motor, bearing frame, screw, radial mounting bracket and lead screw, the lead screw is connected with step motor's output end, installs the screw on the lead screw, the both ends of lead screw are passed through the bearing frame and are connected with radial mounting bracket, radially install step motor on the mounting bracket, and radial mounting bracket is connected with the mounting panel, the one side of screw and the one side contact of radial mounting bracket, and the probe is installed to the another side of screw.

The invention has the following beneficial effects:

1. the method is suitable for measuring the annular experimental part and is closer to the real engineering application background requirement;

2. the device realizes the circumferential movement of the probe relative to the blade cascade, has higher test precision, is not influenced by the airflow in the blade cascade because the supporting control part is arranged at the outer side of the blade cascade and has larger size, can not influence the airflow direction in the blade cascade, can provide more accurate positioning control, is more stable to install, ensures that the probe keeps higher stability in the blowing experiment, and improves the precision of a test result;

3. the invention can freely move the axial position according to the requirement to meet the test requirements of different axial positions, and can be used for experimental measurement of outlet parameters and parameter measurement in a flow channel.

Drawings

FIG. 1 is a schematic structural diagram of a three-dimensional motion mechanism of a pneumatic probe for testing an axial flow compressor;

FIG. 2 is a schematic structural view of the mounting bracket;

in the figure, 1-mounting plate, 2-mounting frame, 3-toothed ring, 4-gear, 5-cascade, 6-motor, 7-probe, 8-positioning bolt, 9-bearing, 21-stepping motor, 22-bearing seat, 23-screw, 24-radial mounting frame and 25-screw rod.

Detailed Description

In order that the objects, aspects and advantages of the invention will become more apparent, the invention will be described by way of example only, and in connection with the accompanying drawings. It is to be understood that such description is merely illustrative and not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.

In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the interconnection of two elements or through the interaction of two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The first embodiment is as follows: the embodiment is described with reference to fig. 1, and the three-dimensional movement mechanism of the pneumatic probe for the axial flow compressor test of the embodiment includes a toothed ring 3, a gear 4, a blade cascade 5, a motor 6, a probe 7 and a bearing 9, wherein the motor 6 is fixed on the outer wall of the blade cascade 5, the gear 4 is arranged at the output end of the motor 6, the toothed ring 3 is connected with the blade cascade 5 through the bearing 9, the gear 4 is meshed with the toothed ring 3, the toothed ring 3 is connected with the probe 7, and the probe 7 extends into a flow channel of the blade cascade 5;

the blade cascade 5 is an annular blade cascade; the gear 4 is driven to rotate by the motor, so that the gear ring 3 is driven to drive the probe 7 to rotate, the probe 7 is driven to move circumferentially, and meanwhile, the controllable movement of the probe 7 in the circumferential direction, the axial direction and the radial direction is realized, the movement of the probe 7 is stable, namely, the circumferential regulation and control angle of the pneumatic probe in a wider range can be realized on the basis of ensuring the stable operation of the pneumatic probe, the measurement of pneumatic parameters in a wide angle range is met, the accuracy and precision of test testing are improved, and the requirement of measuring the flow field parameters of annular cascade and compressor stage parts is met;

the device is characterized by further comprising a mounting plate 1, a mounting frame 2 and a positioning bolt 8, wherein the mounting frame 2 is arranged on the gear ring 3, a chute 11 is arranged on the mounting plate 1, the positioning bolt 8 penetrates through the chute 11 to be connected with the mounting frame 2, and a probe 7 is arranged at one end of the mounting plate 1;

the output end of the motor 6 is connected with the gear 4 through a speed reducer;

a testing hole 51 is processed on the blade cascade 5, and the probe 7 penetrates through the testing hole 51 and extends into the cavity of the blade cascade 5; the circumferential angle of the test hole 51 is 180-300 degrees; in the present embodiment, it should be understood that a clamping device for carrying the probe 7 can be installed on the mounting plate 1 by a person skilled in the art, for example, the clamping device includes a connecting plate and two steel plates, the two steel plates are placed on two sides of the probe 7, and a screw nut is set after passing through the two steel plates through a screw, so that the two steel plates clamp the probe 7, one steel plate is connected with the mounting plate 1, and the position of the probe extending into the cascade, i.e. the radial position, can be adjusted by the clamping position between the steel plate and the probe;

the number of the sliding grooves 11 is two; a threaded hole is processed in the mounting frame 2, the position of the mounting plate 1 is adjusted, and the positioning bolt 8 is rotated to fix the mounting plate 1, so that the axial position of the probe 7 is adjusted;

in the research of aviation turbojet engines and gas turbines, wind tunnel experiments are an important research method, the data obtained by testing are very important to constructing an empirical model, perfecting a calculation method and verifying a theoretical mechanism, and because the annular cascade experiments and the modeling experiments of the gas compressor parts are closer to the real gas compressor structure, the real pneumatic performance and the flow characteristics of axial flow gas compressor parts or blade profiles can be reflected better.

The second embodiment is as follows: the embodiment is described with reference to fig. 1, and the three-dimensional movement mechanism of the pneumatic probe for testing the axial flow compressor of the embodiment includes a toothed ring 3, a gear 4, a blade cascade 5, a motor 6, a probe 7 and a bearing 9, wherein the motor 6 is fixed on the outer wall of the blade cascade 5, the gear 4 is arranged at the output end of the motor 6, the outer wall of the blade cascade 5 is connected with the toothed ring 3 through the bearing 9, the gear 4 is meshed with the toothed ring 3, the toothed ring 3 is connected with the probe 7, and the probe 7 extends into a cavity of the blade cascade 5;

the blade cascade 5 is a fan-shaped blade cascade; the gear 4 is driven to rotate by the motor, so that the gear ring 3 is driven to drive the probe 7 to rotate, the probe 7 is driven to move circumferentially, and meanwhile, the controllable movement of the probe 7 in the circumferential direction, the axial direction and the radial direction is realized, the movement of the probe 7 is stable, namely, the circumferential regulation and control angle of the pneumatic probe in a wider range can be realized on the basis of ensuring the stable operation of the pneumatic probe, the measurement of pneumatic parameters in a wide angle range is met, the accuracy and precision of test testing are improved, and the requirement of measuring the flow field parameters of annular cascade and compressor stage parts is met;

a testing hole 51 is processed on the blade cascade 5, and the probe 7 penetrates through the testing hole 51 and extends into a flow channel of the blade cascade 5; the circumferential angle of the test hole 51 is 180-300 degrees; in the present embodiment, it should be understood that a clamping device for carrying the probe 7 can be installed on the mounting plate 1 by a person skilled in the art, for example, the clamping device includes a connecting plate and two steel plates, the two steel plates are placed on two sides of the probe 7, and a screw nut is set after passing through the two steel plates through a screw, so that the two steel plates clamp the probe 7, one steel plate is connected with the mounting plate 1, and the position of the probe extending into the cascade, i.e. the radial position, can be adjusted by the clamping position between the steel plate and the probe;

The third concrete implementation mode: the embodiment is described with reference to fig. 1-2, and the three-dimensional movement mechanism of the pneumatic probe for the axial flow compressor test of the embodiment includes a toothed ring 3, a gear 4, a blade cascade 5, a motor 6, a probe 7 and a bearing 9, the motor 6 is fixed on the outer wall of the blade cascade 5, the gear 4 is arranged at the output end of the motor 6, the toothed ring 3 is connected with the outer wall of the blade cascade 5 through the bearing 9, the gear 4 is meshed with the toothed ring 3, the toothed ring 3 is connected with the probe 7, and the probe 7 extends into a flow channel of the blade cascade 5;

the blade cascade 5 is a fan-shaped blade cascade or an annular blade cascade; the gear 4 is driven to rotate by the motor, so that the gear ring 3 is driven to drive the probe 7 to rotate, the probe 7 is driven to move circumferentially, and meanwhile, the controllable movement of the probe 7 in the circumferential direction, the axial direction and the radial direction is realized, the movement of the probe 7 is stable, namely, the circumferential regulation and control angle of the pneumatic probe in a wider range can be realized on the basis of ensuring the stable operation of the pneumatic probe, the measurement of pneumatic parameters in a wide angle range is met, the accuracy and precision of test testing are improved, and the requirement of measuring the flow field parameters of annular cascade and compressor-stage components is met;

a testing hole 51 is processed on the blade cascade 5, and the probe 7 penetrates through the testing hole 51 and extends into the cavity of the blade cascade 5; the circumferential angle of the test hole 51 is 180-300 degrees;

the device is characterized by further comprising a stepping motor 21, a bearing seat 22, a nut 23, a radial mounting frame 24 and a lead screw 25, wherein the lead screw 25 is connected with the output end of the stepping motor 21, the nut 23 is mounted on the lead screw 25, two ends of the lead screw 25 are connected with the radial mounting frame 24 through the bearing seat 22, the stepping motor 21 is mounted on the radial mounting frame 24, the radial mounting frame 24 is connected with the mounting plate 1, one surface of the nut 23 is in contact with one surface of the radial mounting frame 24 to prevent the nut 23 from deflecting, and a probe 7 is mounted on the other surface of the nut 23 to realize adjustment of the radial position;

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse explanation, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the interior and exterior relative to the contour of the components themselves.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can encompass both an orientation of "above … …" and "below … …". The device may be otherwise oriented 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in other sequences than those illustrated or described herein.

It should be noted that, in the above embodiments, as long as the inconsistent technical solutions can be aligned and combined, a person skilled in the art can exhaust all possibilities according to the mathematical knowledge of the alignment and combination, and therefore the invention does not describe the aligned and combined technical solutions one by one, but it should be understood that the aligned and combined technical solutions have been disclosed by the invention.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a three-dimensional motion of pneumatic probe mechanism for axial compressor machine test which characterized in that: the device comprises a toothed ring (3), a gear (4), a blade cascade (5), a motor (6), a probe (7) and a bearing (9), wherein the motor (6) is fixed on the outer wall of the blade cascade (5), the gear (4) is arranged at the output end of the motor (6), the toothed ring (3) is connected with the outer wall of the blade cascade (5) through the bearing (9), the gear (4) is meshed with the toothed ring (3), the toothed ring (3) is connected with the probe (7), and the probe (7) extends into a flow channel of the blade cascade (5).

2. The three-dimensional motion mechanism of the pneumatic probe for the axial flow compressor test, according to claim 1, is characterized in that: the blade cascade (5) is an annular blade cascade or a fan-shaped blade cascade.

3. The three-dimensional motion mechanism of the pneumatic probe for the axial flow compressor test, according to claim 1, is characterized in that: the probe mounting structure is characterized by further comprising a mounting plate (1), a mounting frame (2) and a positioning bolt (8), the mounting frame (2) is arranged on the gear ring (3), a sliding groove (11) is formed in the mounting plate (1), the positioning bolt (8) penetrates through the sliding groove (11) to be connected with the mounting frame (2), and a probe (7) is arranged at one end of the mounting plate (1).

4. The three-dimensional motion mechanism of the pneumatic probe for the axial flow compressor test, according to claim 1, is characterized in that: the output end of the motor (6) is connected with the gear (4) through a speed reducer.

5. The three-dimensional motion mechanism of the pneumatic probe for the axial flow compressor test according to claim 1 or 3, wherein the three-dimensional motion mechanism comprises: a testing hole (51) is processed on the blade cascade (5), and the probe (7) penetrates through the testing hole (51) and extends into a flow channel of the blade cascade (5).

6. The three-dimensional motion mechanism of the pneumatic probe for the axial flow compressor test, according to claim 3, is characterized in that: the number of the sliding grooves (11) is two.

7. The three-dimensional motion mechanism of the pneumatic probe for the axial flow compressor test, according to claim 5, is characterized in that: still include step motor (21), bearing frame (22), screw (23), radial mounting bracket (24) and lead screw (25), lead screw (25) are connected with step motor's (21) output, install screw (23) on lead screw (25), the both ends of lead screw (25) are passed through bearing frame (22) and are connected with radial mounting bracket (24), install step motor (21) on radial mounting bracket (24), and radial mounting bracket (24) are connected with mounting panel (1), and probe (7) are installed to the one side of one side and the one side contact of radial mounting bracket (24) of screw (23), the another side of screw (23).