Transient total pressure distortion generating device for compressor ground test

Abstract

The utility model relates to the technical field of aero-engines, in particular to a transient total pressure distortion generating device for a compressor ground test, which comprises a cylindrical casing, a steering engine and a distortion piece arranged in the casing, a support is fixedly connected with the outer wall of the casing, the steering engine is arranged outside the casing, and the distortion piece is arranged in the casing. The number of the distortion pieces is at least one, one end of each distortion piece is fixedly connected with a connecting rod, the end, penetrating through the casing, of each connecting rod is connected with a steering engine through a coupler, the steering engines are fixedly connected with the casing through a support, the steering engines are powered by an external independent power source, and the distortion pieces are driven by the steering engines to rotate. The distortion sheets can be arranged to be fan-shaped, ring-shaped or in any shape which does not interfere with each other and does not interfere with the casing, so that different distortion maps are simulated, and each steering engine controls the distortion sheets to rotate independently and do not influence each other. According to the utility model, the total pressure distortion at the air inlet channel under the actual flight condition can be simulated, and the accuracy of the experiment result is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of aero-engine, especially relates to a transient total pressure distortion generating device for compressor ground test. BACKGROUND

[0002] Inlet distortion is one of the key factors to induce fan and compressor flow instability of aero-engine. According to different causes, inlet distortion can be divided into total pressure distortion, total temperature distortion and rotational distortion. According to the trigger and duration, total pressure distortion can be divided into steady-state total pressure distortion and transient total pressure distortion. The current engine total pressure distortion ground performance test mainly aims at steady-state distortion, that is, the test purpose is achieved by installing distortion sheet (American) or plugboard (Russian) and other distortion generating devices at the engine inlet, and the engine outlet flow is gradually reduced until stall under the condition of constant speed, so as to obtain the stable boundary of the compressor. Transient total pressure distortion refers to the total pressure distortion of the engine inlet caused in a short time due to sudden change of flight attitude or strong disturbance of flow. Its characteristics are instantaneous occurrence and high intensity.

[0003] Modern high-performance fighter aircraft have higher requirements for the ability of engine to resist inlet distortion. Large angle of attack and post-stall maneuver flight ( "cobra maneuver", "falling leaf" and large angle of attack longitudinal and lateral capture maneuver, etc.), as well as the transient total pressure distortion caused by strong sea array wind during take-off of carrier-based aircraft frequently leads to engine in-flight shutdown or take-off failure. A large number of flight and wind tunnel tests show that, compared with steady-state distortion, transient distortion can cause compressor to stall in advance at a lower distortion intensity, and the stall process is significantly accelerated.

[0004] The stable boundary obtained by using steady-state inlet total pressure distortion in ground test is not applicable to the transient total pressure distortion encountered in real flight, and cannot accurately simulate the total pressure distortion generated under real inlet conditions. Therefore, a transient total pressure distortion generating device for compressor ground test is proposed, which can simulate the total pressure distortion occurring at the inlet of the actual flight, and improve the accuracy of experimental results. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a transient total pressure distortion generating device for compressor ground test, solving the problem that the existing technology cannot simulate the total pressure distortion generated at the inlet under actual flight conditions, the experimental data is not referenceable, and the accuracy of experimental results is reduced.

[0006] In order to achieve the above object, the utility model provides a kind of transient total pressure distortion generating device for compressor ground test, including casing, steering wheel and the distortion sheet being arranged in the inside of casing, the steering wheel is arranged in the outside of the casing, the number of distortion sheet is arranged as at least one, and the one end of each distortion sheet is fixedly connected with connecting rod, and the one end of connecting rod passes through the casing and is connected with the steering wheel by coupling, and the steering wheel is fixedly connected with the casing by support.

[0007] Preferably, the casing is provided in a cylindrical shape, and the support is fixedly connected with the outer wall of the casing.

[0008] Preferably, the sum of the circumferential angles of all the distortion sheets ranges from 0° to 360°.

[0009] Preferably, the distortion sheets are rotated under the drive of the steering wheel, and the distortion sheets are provided in a fan shape, a ring shape or any shape without mutual interference and interference with the casing, so as to simulate different distortion patterns.

[0010] Preferably, a plurality of evenly spaced or unevenly spaced through holes are formed in the distortion sheet.

[0011] Preferably, the distortion sheet is provided in a frame structure, and a gauze is arranged on the frame structure, and the mesh number of the gauze is adjusted as needed, so as to manufacture total pressure distortion of different patterns.

[0012] Preferably, the material of the distortion sheet is stainless steel.

[0013] Preferably, the material of the frame structure is stainless steel.

[0014] Preferably, the steering wheel is powered by an external independent power supply.

[0015] Preferably, the rotation of each steering wheel to control the distortion sheet is independent of each other and does not affect each other.

[0016] Therefore, the utility model provides a kind of transient total pressure distortion generating device for compressor ground test with the following beneficial effects: by arranging distortion sheet in the inside of casing, its distortion sheet is arranged in parallel with inlet airflow before the work of device, and total pressure distortion is not generated at this time because the thickness of distortion sheet is relatively thin, when distortion sheet is rapidly rotated under the drive of steering wheel, distortion sheet instantaneously hinders airflow, thereby generating instantaneous total pressure distortion, and the rotation of each steering wheel is controlled separately, and the rotation angle of each distortion sheet can be adjusted as needed to simulate distortion condition under approximate actual flight condition, so that experimental result is more accurate. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1It is the structure schematic view of a kind of transient total pressure distortion generating device for compressor ground test in the utility model embodiment 1.

[0018] Figure 2 It is the schematic diagram before work of a kind of transient total pressure distortion generating device for compressor ground test in the utility model embodiment 1.

[0019] Figure 3 It is the structure schematic view when distortion piece is annular in the utility model embodiment 1.

[0020] Figure 4 It is the schematic diagram of the non-uniform distribution of through hole on distortion piece in the utility model embodiment 1.

[0021] Figure 5 It is the structure schematic view of a kind of transient total pressure distortion generating device for compressor ground test in the utility model embodiment 2.

[0022] Figure 6 It is the structure schematic view of distortion piece in the utility model embodiment 2.

[0023] Reference signs

[0024] 1, casing;2, steering gear;3, distortion piece;4, connecting rod;5, coupling;6, support;7, through hole;8, frame structure;9, gauze. DETAILED DESCRIPTION

[0025] The technical scheme of the utility model is further explained below by the drawings and embodiments.

[0026] Unless otherwise defined, the technical terms or scientific terms used in the utility model should be the usual meaning understood by persons with ordinary skills in the art to which the utility model belongs. The "first", "second" and similar words used in the utility model do not represent any order, quantity or importance, but are only used to distinguish different components. "Include" or "contain" and similar words mean that the elements or objects before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connection" or "connected" and similar words are not limited to physical or mechanical connection, but can include electrical connection, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to represent relative positional relationship, when the absolute position of the described object changes, the relative positional relationship can also change accordingly.

[0027] Embodiment 1

[0028] As Figures 1-3As shown, this utility model discloses a transient total pressure distortion generator for compressor ground testing, comprising a casing 1, a servo motor 2, and distortion plates 3 disposed inside the casing 1. The servo motor 2 is disposed outside the casing 1. The number of distortion plates 3 is set to eight. One end of each distortion plate 3 is fixedly connected to a connecting rod 4. One end of the connecting rod 4 passes through the casing 1 and is connected to the servo motor 2 via a coupling 5. The servo motor 2 is fixedly connected to the casing 1 via a bracket 6. The casing 1 is cylindrical, and the bracket 6 is fixedly connected to the outer wall of the casing 1.

[0029] The circumferential angle and number of distortion plates 3 can be changed. The total circumferential angle of all distortion plates 3 is between 0° and 360°. The distortion plates 3 rotate under the drive of the servo motor 2. The distortion plates 3 can be set into a fan shape or a ring shape, or can be set into any shape that will not interfere with each other and will not interfere with the casing 1, thereby simulating different distortion patterns. The distortion plates 3 do not need to cover the entire inlet flow channel. The area covered can be adjusted as needed.

[0030] like Figure 4 As shown, the distortion sheet 3 has several through holes 7 that are evenly spaced and of the same size. The through holes 7 on the distortion sheet 3 can be evenly distributed or unevenly distributed, and the size of the through holes 7 can also be uneven.

[0031] The distortion plate 3 is made of stainless steel, which prevents it from breaking under engine inlet wind speed conditions.

[0032] Servo motor 2 is powered by an external independent power supply. Each servo motor 2 controls the rotation of the distortion plate 3 independently and without affecting each other. Servo motor 2 can drive the distortion plate 3 to rotate continuously, thereby generating periodic total voltage distortion that changes over time. It can also rotate the distortion plate 3 to the required angle and then stop.

[0033] Example 2

[0034] like Figures 5-6 As shown, this utility model discloses a transient total pressure distortion generator for compressor ground testing, comprising a casing 1, a servo motor 2, and distortion plates 3 disposed inside the casing 1. The servo motor 2 is disposed outside the casing 1. The number of distortion plates 3 is set to eight. One end of each distortion plate 3 is fixedly connected to a connecting rod 4. One end of the connecting rod 4 passes through the casing 1 and is connected to the servo motor 2 via a coupling 5. The servo motor 2 is fixedly connected to the casing 1 via a bracket 6. The casing 1 is cylindrical, and the bracket 6 is fixedly connected to the outer wall of the casing 1.

[0035] The distortion sheet 3 can change in the circumferential angle and quantity, and the total sum of the circumferential angles of all the distortion sheets 3 ranges from 0° to 360°, the distortion sheet 3 rotates under the driving of the steering engine 2, the distortion sheet 3 is arranged in a fan shape, and can also be arranged in a ring shape or any shape without interference with each other and the casing 1, so as to simulate different distortion maps, and the distortion sheet 3 can not need to cover the whole inlet flow channel, and the covered area can be adjusted according to the requirement.

[0036] The distortion sheet 3 is arranged on the frame structure 8, and the gauze 9 is arranged on the frame structure 8, so as to form total pressure distortion by hindering the airflow, the mesh number of the gauze 9 is adjusted according to the requirement, so as to manufacture total pressure distortion of different maps.

[0037] The material of the frame structure 8 is stainless steel.

[0038] The steering engine 2 is powered by an external independent power supply, the rotation of each steering engine 2 for controlling the distortion sheet 3 is independent of each other and does not affect each other, the steering engine 2 can drive the distortion sheet 3 to rotate all the time, so as to produce periodic total pressure distortion changing with time, or the distortion sheet 3 can be stopped after being rotated to the required angle.

[0039] Therefore, the utility model adopts the above structure of a kind of for compressor ground test's transient total pressure distortion generating device: before the device works, distortion sheet is arranged in parallel with inlet airflow, at this time, total pressure distortion is not generated, when steering engine drives distortion sheet to rotate rapidly, distortion sheet can produce instantaneous transient total pressure distortion by hindering airflow, because the rotation of each steering engine is controlled separately, the rotation angle of each distortion sheet can be adjusted according to the requirement, the distortion condition under approximate actual flight condition can be simulated, so that experimental result is more accurate.

[0040] Finally, it should be noted that: the above examples are only used to illustrate the technical scheme of the utility model and not to limit it, although the utility model is described in detail with reference to the preferred embodiments, those skilled in the art should understand that: its still can modify or equivalent replace the technical scheme of the utility model, and these modifications or equivalent replacements also cannot make the modified technical scheme deviate from the spirit and scope of the technical scheme of the utility model.

Claims

1. A transient total pressure distortion generator for compressor ground testing, characterized by: The utility model relates to a kind of total pressure distortion simulation device, including casing, steering engine and the distortion sheet being arranged in the inside of casing, the steering engine is arranged in the outside of the casing, the quantity of the distortion sheet is arranged as at least one, one end of each the distortion sheet is fixedly connected with connecting rod, the connecting rod passes through the one end of the casing and is connected with the steering engine by shaft coupling, the steering engine is fixedly connected with the casing by support.

2. A transient total pressure distortion generator for ground testing of a compressor as defined in claim 1, characterized in that: The casing is set as cylindrical, and the support is fixedly connected with the outer wall of the casing.

3. A transient total pressure distortion generator for ground testing of a compressor as defined in claim 1, characterized in that: The sum of the circumferential angles of all the distortion sheets ranges from 0° to 360°.

4. A transient total pressure distortion generator for ground testing of a compressor as defined in claim 3, characterized in that: The distortion sheets rotate under the drive of the steering engine, and are arranged in the shape of a sector, a ring or any shape without interference with each other and the casing, so as to simulate different distortion maps.

5. A transient total pressure distortion generator for use in ground testing of a compressor as defined in claim 4, characterized in that: A plurality of evenly spaced or uneven through holes are formed in the distortion sheets.

6. A transient total pressure distortion generator for ground testing of a compressor as defined in claim 4, characterized in that: The distortion sheets are arranged in a frame structure, and a gauze is arranged on the frame structure. The mesh number of the gauze can be adjusted as needed, so as to manufacture different total pressure distortion maps.

7. A transient total pressure distortion generator for ground testing of a compressor as defined in claim 5, characterized in that: The material of the distortion sheets is stainless steel.

8. A transient total pressure distortion generator for ground testing of a compressor as defined in claim 6, characterized in that: The material of the frame structure is stainless steel.

9. A transient total pressure distortion generator for ground testing of a compressor as defined in claim 4, characterized in that: The steering engine is powered by an external independent power supply.

10. A transient total pressure distortion generator for ground testing of a compressor as defined in claim 9, characterized in that: Each steering engine controls the rotation of the distortion sheets independently and without affecting each other.

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