CN214502892U

CN214502892U - Air entraining test assembly and air entraining device for testing air entraining test assembly

Info

Publication number: CN214502892U
Application number: CN202120968765.XU
Authority: CN
Inventors: 王向辉; 赵书熠; 沈宏; 何鸣; 王凯
Original assignee: AECC Commercial Aircraft Engine Co Ltd
Current assignee: AECC Commercial Aircraft Engine Co Ltd
Priority date: 2021-05-08
Filing date: 2021-05-08
Publication date: 2021-10-26
Anticipated expiration: 2031-05-08

Abstract

An object of the utility model is to provide a test is with bleed device promotes the accuracy and the reliability of bleed test. Another object of the utility model is to provide a bleed test subassembly. The test air entraining device for achieving the purpose comprises a first Venturi assembly, a second Venturi assembly and an air entraining pipe. The first Venturi assembly comprises a first contraction section, a first throat and a first diffusion section, a first hole portion is formed in a casing of the aircraft engine, at least one part of the first contraction section and the first throat is limited by the first hole portion, the second Venturi assembly is arranged in the first throat and provided with a second contraction section, a second throat, a second diffusion section and an outlet section, and the outlet section is communicated with the outside through a gas guide pipe.

Description

Air entraining test assembly and air entraining device for testing air entraining test assembly

Technical Field

The utility model relates to an aeroengine test field especially relates to a bleed test subassembly and test are with bleed device thereof.

Background

The main flow path of the aircraft engine comprises an air inlet channel, an air compressor, a combustion chamber, a turbine, a spray pipe and the like (atmosphere enters the flow path of the engine through the air inlet channel, is compressed by the air compressor, is ignited in the combustion chamber, and then high-temperature and high-pressure gas does work on the turbine and is finally discharged into the atmosphere through the spray pipe). The aircraft engine is externally provided with accessories and pipelines for conveying fuel oil, lubricating oil and air media.

Bleed air testing for aircraft engines includes: one is the need to test the pressure of the gas in a certain area on the engine and the other is the need to lead the gas at a specified temperature and pressure from one interface of the casing to another for aircraft gas supply or bearing cavity sealing. For bleed air for aircraft air supply or for bearing cavity sealing, a pipeline with a drift diameter of more than 30mm is generally adopted, and a test bleed air pipeline generally has a drift diameter of less than 10 mm.

Fig. 1 shows a schematic block diagram of a conventional bleed air test, where 90 is the direction of air flow, a bleed air line 91 bleeds air at a specific location 93 of an aircraft engine 92, the air is led to a sensor 94, and the pressure or temperature of the air is recorded by the sensor). Fig. 2 shows a perspective view of a conventional bleed air test line, and fig. 3 shows a cross-sectional view of a conventional bleed air test line, in which a bleed air line 91 is provided on a casing 95 for bleeding air from the inside to the outside of the casing 95.

However, the inventor finds that in the air-entraining process, due to weather or other reasons, the gas is mixed with water vapor or tiny particle impurities, and after a certain amount of water vapor or tiny particle impurities are accumulated, phenomena such as icing can occur, so that the test of parameters such as air-entraining pressure and temperature is influenced, the test value is interfered, and when the quantity of icing or tiny particles is large, the air-entraining pipeline is even blocked, so that the accuracy and the reliability of the air-entraining test are influenced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a test is with bleed device promotes the accuracy and the reliability of bleed test.

Another object of the present invention is to provide a bleed air test assembly, which employs the bleed air device for test to bleed air as described above.

To achieve the above object, a test bleed air device for an aircraft engine includes:

a first venturi assembly including a first convergent section, a first throat, and a first divergent section, a first bore portion being formed in a case of an aircraft engine, the first bore portion defining at least a portion of the first convergent section and the first throat;

a second venturi assembly disposed in the first throat having a second converging section, a second throat, a second diverging section, and an outlet section; and

a bleed duct communicating the outlet section with an exterior.

In one or more embodiments, the bleed air arrangement further comprises:

the base body is arranged on the casing and is provided with a second hole part which is arranged corresponding to the first hole part;

wherein a remaining portion of the first throat and the first diffuser section are defined by the second orifice portion, the first orifice portion communicating with the second orifice portion to define the first venturi assembly.

In one or more embodiments, the air-entraining pipe penetrates through the wall surface of the seat body and is communicated with the outlet section.

In one or more embodiments, the bleed air duct is welded to the housing.

In one or more embodiments, the housing and the casing are connected by a fastener.

In one or more embodiments, the second diffuser section has a water outlet.

In one or more embodiments, in a radial direction of the casing, the first throat has a first throat length, the first diffuser section has a first diffuser section length, the axial center of the bleed air duct has a first distance from the first diffuser section, and the first throat length, the first diffuser section length, and the first distance satisfy the following relationship:

l1 is not less than L2 not less than 2X L1 and 0.25X L1 not less than L3 not less than 0.5X L1;

wherein L1 is the first throat length, L2 is the first diffuser length, and L3 is the first distance.

In one or more embodiments, in a radial direction of the casing, the first throat has a first length in the casing and a second length in the seat, and the first throat length, the first distance, the first length, and the second length satisfy the following relationship:

0.1 × L1 ≤ L4 ≤ 0.4 × L1 and L5 ═ 2 × L3;

wherein L4 is the first length and L5 is the second length.

In one or more embodiments, in a longitudinal cross-section of the first venturi assembly, the first converging section has a first converging angle between two wall surfaces and the first diverging section has a first diverging angle between two wall surfaces, the first converging angle being equal to the first diverging angle.

The bleed air test assembly for achieving the other purpose comprises a sensor and a bleed air device, wherein the bleed air device is the test bleed air device;

wherein the bleed duct communicates the outlet section with the sensor.

The utility model discloses an advance effect includes following one or combination:

this bleed device can be through the first venturi subassembly and the second venturi subassembly that set up, and moisture, impurity etc. in the bleed can get rid of to the outside behind the schlieren's structure, reduce moisture or impurity in the central test bleed pipe, reduce the jam probability of engine test bleed structure. Impurities and moisture in the introduced air flow are separated through the Venturi effect twice, so that the air guide pipe can introduce clean air flow, the interference of icing or tiny particles on a test value is reduced, and the accuracy and reliability of an air guide test are ensured.

Drawings

The above and other features, properties and advantages of the present invention will become more apparent from the following description of the embodiments with reference to the accompanying drawings, in which:

figure 1 shows a schematic block diagram of an existing bleed air test;

figure 2 shows a schematic perspective view of a prior art conventional bleed air test line;

figure 3 shows a schematic cross-sectional view of a prior art conventional bleed air test line;

figure 4 shows a schematic cross-sectional view of an embodiment of the test bleed air apparatus;

figure 5 shows a schematic perspective view of an embodiment of the test bleed air apparatus;

FIG. 6 illustrates an enlarged partial schematic view of the second diverging section of the present second venturi assembly;

fig. 7 is a schematic cross-sectional view of an embodiment of the base;

FIG. 8 illustrates a partial cross-sectional view of one embodiment of a barrel;

figure 9 shows a schematic cross-sectional view of one embodiment of the present bleed air duct;

FIG. 10 illustrates a cross-sectional schematic view of one embodiment of the present second venturi assembly.

Detailed Description

The following discloses many different embodiments or examples for implementing the subject technology described. Specific examples of components and arrangements are described below to simplify the present disclosure, but these are merely examples and are not intended to limit the scope of the present disclosure. Additionally, reference numerals and/or letters may be repeated among the various examples throughout this disclosure. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed.

Also, the present application uses specific words to describe embodiments of the application, such as "one embodiment," "an embodiment," and/or "some embodiments" to mean that a particular feature, structure, or characteristic described in connection with at least one embodiment of the application. Therefore, it is emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, some features, structures, or characteristics of one or more embodiments of the present application may be combined as appropriate. In addition, the terms "first", "second", and the like are used to define the components, and are used only for convenience of distinguishing the corresponding components, and the terms do not have special meanings unless otherwise stated, and therefore, the scope of the present application is not to be construed as being limited.

It should be noted that these and other figures are given by way of example only and are not drawn to scale, and should not be construed as limiting the scope of the invention as it is actually claimed. Further, the conversion methods in the different embodiments may be appropriately combined.

It will be appreciated that the reference system as used in the following description is independent of the reference system of the background art.

For solving among the air entraining device for current aeroengine test, the easy problem that leads to the influence test accuracy because of impurity that exists, an aspect of the utility model provides an air entraining device for test, like figure 4 shows the section view schematic diagram under this air entraining device for test implementation, figure 5 shows the stereogram under this air entraining device for test implementation.

The test air entraining device comprises a first Venturi assembly 1, a second Venturi assembly 2 and an air entraining pipe 3.

It will be appreciated that a venturi (also known as a venturi), is a conduit made using the venturi effect. The venturi effect is a phenomenon in which a flow velocity of a fluid increases when a restricted flow passes through a reduced flow cross section, and the flow velocity is inversely proportional to the flow cross section, and the increase in the flow velocity is accompanied by a decrease in the pressure of the fluid, known as a venturi phenomenon, by bernoulli's equation. By convention, this effect is meant that a low pressure is created in the vicinity of the high velocity flowing fluid, thereby creating an adsorption effect. The venturi assembly described herein is a component that is fabricated using the venturi effect, which may be a venturi tube or a component having a venturi effect structure.

The first venturi assembly 1 includes a first converging section 11, a first throat 12, and a first diverging section 13. The contraction and diffusion described herein and hereinafter is directed to a hole structure having a venturi effect provided in the venturi element, and the contraction and diffusion are with respect to the flow direction of the gas flow, that is, the contraction means that the hole diameter is tapered in the flow direction of the gas flow, and the diffusion means that the hole diameter is gradually enlarged in the flow direction of the gas flow.

A first bore portion 40 is formed in the casing 4 of the aircraft engine, which first bore portion 40 defines the first constriction 11 and a part of the first throat 12, i.e. the first constriction 11 and the first throat 12 are formed in the first bore portion 40 which is formed in the casing 4.

The second venturi assembly 2 is disposed in the first throat 12 having a second converging section 21, a second throat 22, a second diverging section 23, and an outlet section 24.

The bleed air duct 3 connects the outlet section 24 of the second venturi assembly 2 to the outside, so that the air flow flowing through the outlet section 24 is conducted away.

With continued reference to fig. 4, the flow direction of the air in the bleed air device is shown in the form of a dashed arrow, wherein a dashed line a is a main flow path, and after the dashed line a of the main flow path enters the first constriction 11, a first branch flow path dashed line B is branched off under the venturi effect, and a part of the impurities are separated along the dashed line B. When the main flow path dotted line a enters the second throat 22 and the second diffuser section 23, a second branch flow path dotted line C is branched under the venturi effect, and impurities, moisture, and the like are separated along the dotted line C, so that the air flow entering the outlet section 24 is clean, and the air flow is guided out along the bleed air pipe 3 through the dotted line D.

This bleed device can be through the first venturi subassembly 1 and the second venturi subassembly 2 that set up, and moisture, impurity etc. in the bleed can get rid of the outside behind the schlieren's structure, reduce moisture or impurity in the central test bleed pipe, reduce the jam probability of engine test bleed structure. Impurities and moisture in the introduced air flow are separated through the Venturi effect twice, so that the air guide pipe can introduce clean air flow, the interference of icing or tiny particles on a test value is reduced, and the accuracy and reliability of an air guide test are ensured.

Although one embodiment of the present bleed air arrangement is described above, in other embodiments of the present bleed air arrangement, the present bleed air arrangement may have more details than the above-described embodiment in many respects, and at least some of these details may vary widely. At least some of these details and variations are described below in several embodiments.

In one embodiment of the test air entraining device, the air entraining device further includes a seat body 5, and the seat body 5 is disposed on the casing 4 as shown in the figure and has a second hole portion 50 corresponding to the first hole portion 40. Wherein the remainder of the first throat 12, i.e., the remainder of the first throat 12 other than that defined by the first bore 40, is defined by the second bore 50, and the first diverging section 13 is also defined by the second bore 50, such that the joined first and

second bores

40, 50 are in communication and together define the first venturi assembly 1.

It should be understood that the embodiment shown in the drawings is that the seat body 5 and the casing 4 are connected after being separated, but of course, in other embodiments different from the embodiment shown in the drawings, the seat body 5 and the casing 4 may be a single piece, that is, the seat body 5 may be regarded as a part of the casing 4, and in this embodiment, it may be regarded that the first venturi assembly 1 is integrally defined by the casing 4.

In one embodiment of the test air entraining device, the air entraining pipe 3 penetrates through the wall surface of the seat body 5 and then communicates with the outlet section 24 of the second venturi element 2, and the communication may be realized by penetrating the air entraining pipe 3 through the wall surface of the outlet section 24 of the second venturi element 2. In some embodiments, the bleed air pipe 3 and the second venturi assembly 2 may be a single piece, so that the whole of the second venturi assembly 2 is supported by the bleed air pipe 3 penetrating through the wall surface of the seat 5.

In one embodiment of the test air entraining device, the air entraining tube 3 and the seat body 5 are connected by welding.

In one embodiment of the test air entraining device, the seat body 5 and the casing 4 are connected by a fastener such as a bolt, and the seat body 5 can be detached from the casing 4 after use by the fastener connection mode, so that the applicability of the test air entraining device is improved.

Fig. 6 is a partially enlarged view of the second diffusion section of the second venturi assembly, wherein a water outlet 230 is opened on the wall surface of the second diffusion section 23 of the second venturi assembly 2, and the water outlet 230 can discharge the moisture or impurities in the second branch flow path dotted line C branched by the venturi effect, thereby ensuring that the air flow guided out from the outlet section 24 is a clean air flow.

With continued reference to fig. 4, in an embodiment of the bleed air apparatus, in a radial direction of the casing 4, i.e. in a direction of the dashed main flow path line a, the first throat 11 has a first throat length L1, the first diffuser 13 has a first diffuser length L2, and the axial center of the bleed air pipe 3 is located at a first distance L3 from the first diffuser 13, wherein the first throat length L1, the first diffuser length L2 and the first distance L3 satisfy the following relation:

l1 is not less than L2 is not less than 2 × L1 and 0.25 × L1 is not less than L3 is not less than 0.5 × L1.

So set up, can further guarantee that this bleed device has better moisture and impurity separation ability.

Fig. 7 shows a schematic cross-sectional view of an embodiment of the housing, fig. 8 shows a schematic partial cross-sectional view of an embodiment of the casing, and in a specific embodiment of the bleed air device, the first throat 12 has a portion in the casing 4 and the housing 5, respectively, the portion of the first throat 12 in the casing 4 has a first length L4, and the portion in the housing 5 has a second length L5, wherein the first throat length L1, the first distance L3, the first length L4, and the second length L5 satisfy the following relationships:

0.1 × L1 ≦ L4 ≦ 0.4 × L1 and L5 ═ 2 × L3.

Further, in an embodiment of the bleed air apparatus, fig. 7 and 8 are respectively a longitudinal section of the seat body and the casing, wherein a first inward contraction angle x1 is formed between two wall surfaces of the first contraction section 11, a first outward expansion angle x2 is formed between two wall surfaces of the first diffusion section 13, and the first inward contraction angle x1 is equal to the first outward expansion angle x 2. So set up, can further guarantee that this bleed device has better moisture and impurity separation ability.

Further, in some specific embodiments of the present bleed air apparatus, the first inward contraction angle x1 and the first outward expansion angle x2 take values between 50 ° and 100 °.

In some particular embodiments of the present bleed air arrangement, the internal diameter of the first throat 12 is between 30mm and 100 mm.

In some specific embodiments of the present bleed air arrangement, the first throat length L1 is between 20 mm and 60 mm.

As fig. 9 shows a schematic sectional view of an embodiment of the bleed air duct, in some specific embodiments of the bleed air arrangement the bleed air duct 3 has an inner diameter d1 and an outer diameter d2, wherein the inner diameter d1 ranges from 3 mm to 10mm, and the outer diameter d2 and the inner diameter d1 satisfy the following relationship:

d1+1mm≤d2≤d1+4mm。

further, the bleed air duct 3 has a boss portion 30, and the bleed air duct 3 is welded to the seat body 5 through the boss portion 30. The boss part 30 has a thickness L6 and an outer diameter d3, wherein a value of L6 is 2 mm to 6 mm, and the following relation is satisfied between the boss outer diameter d3 and the bleed air pipe outer diameter d 2:

d2≤d3≤d2+4mm。

further, the bleed air pipe 3 has a first section 31 and a second section 32, a connection portion of the first section 31 and the second section 32 has a bending section 33, the bending section 33 is a round angle, and has an inner diameter, and the inner diameter and the bleed air pipe outer diameter d2 satisfy the following relation:

the inner diameter of the inner ring is not less than 3 x d2 and not more than 30 mm.

Figure 10 shows a schematic cross-sectional view of one embodiment of the second venturi assembly 2, the outlet section 24 of the second venturi assembly 2 having an opening 240, the bleed air duct 3 communicating the inside of the second venturi assembly 2 with the outside after entering the outlet section 24 through the opening 240.

Wherein the inner diameter of the opening 240 is less than or equal to the inner diameter of the second throat 22 and less than or equal to twice the inner diameter of the opening 240.

Further, in one embodiment of the test air entrainment device, the first diffuser section 13 of the first venturi assembly 1 is smooth.

Further, in one embodiment of the test air entrainment device, the drain port 230 is beveled along the air flow path so that it has a pre-swirl effect that further promotes the separation of moisture, impurities, and air.

The bleed air arrangement as in one or more of the previous embodiments can be applied to a bleed air test assembly, such as an assembly for static pressure testing of an aircraft engine, wherein the bleed air test assembly further comprises a sensor, with which the bleed air duct 3 communicates the outlet section 24 of the second venturi assembly 2, so that a clean air flow is measured in and out.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention, all without departing from the content of the technical solution of the present invention, fall within the scope of protection defined by the claims of the present invention.

Claims

1. A test bleed air device for an aircraft engine, comprising:

a bleed duct communicating the outlet section with an exterior.

2. The test air entrainment device of claim 1, further comprising:

3. The test air entraining device according to claim 2 wherein the air entraining duct extends through the wall of the housing and is in communication with the outlet section.

4. The test air entrainment device of claim 3, wherein the air entrainment tube is welded to the housing.

5. The test air entrainment device of claim 2 wherein the seat is connected to the casing by fasteners.

6. The test air entraining device according to claim 1 wherein the second diffuser section is provided with a drain opening.

7. The test air entrainment device of claim 2, wherein in a radial direction of the casing, the first throat has a first throat length, the first diffuser section has a first diffuser section length, the axial center of the air entrainment tube has a first distance from the first diffuser section, and the first throat length, the first diffuser section length, and the first distance satisfy the following relationship:

8. The test air entrainment device of claim 7, wherein in a radial direction of the casing, the first throat has a first length in the casing and a second length in the seat, the first throat length, the first distance, the first length, and the second length satisfying the following relationship:

0.1 × L1 ≤ L4 ≤ 0.4 × L1 and L5 ═ 2 × L3;

wherein L4 is the first length and L5 is the second length.

9. The test air entrainment device of claim 1, wherein in a longitudinal cross-section of the first venturi assembly, the first converging section has a first converging angle between walls and the first diverging section has a first diverging angle between walls, the first converging angle being equal to the first diverging angle.

10. A bleed air test assembly comprising sensors and bleed air devices, wherein the bleed air devices are test bleed air devices according to any one of claims 1 to 9;

wherein the bleed duct communicates the outlet section with the sensor.