CN114323652B - Exhaust and gas collection device of axial-flow compressor tester - Google Patents
Exhaust and gas collection device of axial-flow compressor tester Download PDFInfo
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Abstract
The utility model aims to provide an exhaust gas collecting device of an axial flow compressor tester, which reduces the cavity effect. To achieve the object, an exhaust gas collecting device of an axial flow compressor tester comprises an annular gas collecting chamber, a main exhaust port and a bypass exhaust port, wherein the annular gas collecting chamber is provided with a closed end, an open end and a main exhaust port and a bypass exhaust port in the axial direction, and the open end is provided with a gas collecting port connected with a test piece; the device also comprises an exhaust main pipeline which is connected with the main exhaust interface and is provided with a main pipeline pressure regulating device; the device also comprises an exhaust bypass, which is connected with the bypass exhaust interface and is provided with a bypass pressure regulating device; the cross-sectional area of the exhaust main pipe is larger than that of the exhaust bypass.
Description
Technical Field
The utility model relates to an exhaust and gas collection device of an axial flow compressor tester.
Background
With the deep development of the aviation industry, higher requirements are put forward on the working performance of the aero-engine, and with the continuous improvement of the use requirements, the high-load, high-efficiency, low-noise, high-stability and high-reliability compressor technology is developed. However, the internal flow field of the compressor is extremely complex, unsteady flow is remarkable, stall and flutter are accompanied, the technical index of the compressor must be verified through the compressor test, a series of high-precision and high-performance test facilities are constructed for developing the design verification and improvement modification of the compressor.
At present, most of exhaust and gas collection devices of the air compressor testers adopt a volute type structure, and have large volume and large space size. A similar device is disclosed in the patent publication CN 205280366U.
The following problems exist in the test process of the exhaust gas collecting device of the existing air compressor tester: 1) The cavity effect is easy to cause high-amplitude and low-frequency pulsation of the outlet pressure of the test piece, the uniformity of an exhaust flow field of the test piece is influenced by the air flow in the air collection chamber, and the test result is distorted particularly in high-rotating-speed surge boundary admission; 2) The volute body has complex shape and large air flow exhaust loss, and cannot meet the low-rotation-speed and low-pressure-ratio test requirement of the compressor; 3) The size is large, the weight is large, the equipment is not easy to adjust in the installation process, and the installation and debugging period is long; 4) The inner ring surface of the volute and the test piece of the compressor are mostly in the form of spigot lap joint, air leakage is easy, and the high-temperature exhaust of the compressor leads to the temperature rise of the air collection chamber and no effective cooling mode.
Disclosure of Invention
The utility model aims to provide an exhaust gas collecting device of an axial flow compressor tester, which reduces the cavity effect.
To achieve the object, in one embodiment, an axial flow compressor tester exhaust gas collector includes an annular plenum having a closed end in an axial direction, an open end having a gas collection port connected to a test piece, and having a main exhaust port and a bypass exhaust port in a circumferential direction; the device also comprises an exhaust main pipeline which is connected with the main exhaust interface and is provided with a main pipeline pressure regulating device; the device also comprises an exhaust bypass, which is connected with the bypass exhaust interface and is provided with a bypass pressure regulating device; the cross-sectional area of the exhaust main pipe is larger than that of the exhaust bypass.
In one embodiment, the exhaust main line is provided with an inlet, the end of the exhaust bypass is connected to the inlet, and the inlet is located on the downstream side of the main line pressure regulator.
In one embodiment, the primary exhaust interface is tapered in shape.
In one embodiment, the exhaust main line comprises a diverging section on the upstream side of the inlet connection.
In one embodiment, the annular plenum is axially disposed horizontally, and the main exhaust line extends obliquely upward from the annular plenum and then extends vertically upward.
In one embodiment, the exhaust bypass extends obliquely upward from a side of the annular plenum opposite the exhaust main conduit and then merges into the exhaust main conduit.
In one embodiment, the axial flow compressor tester exhaust gas collector further comprises a power transmission device for connecting between the tester and the test piece; the annular plenum includes an inner annular wall and an outer annular wall, and the power transmission device passes axially from an interior of the inner annular wall of the annular plenum.
In one embodiment, a cooling device is further provided inside the inner annular wall, and an exhaust port of the cooling device is aligned with the power transmission device.
In one embodiment, the outer annular wall has an end plate at the closed end, the end plate being flanged to an end of the inner annular wall and having a central bore for the power transmission to pass through.
In one embodiment, the gas collection interface includes a connection flange disposed at the open end of the inner and outer annular walls.
The inner ring and the outer ring are combined to form the air collection chamber, so that the exhaust air collection chamber structure of the axial-flow compressor is optimized, the cavity effect is reduced, the influence of air flow of the air collection chamber on the outlet flow field of the compressor is reduced, and the testing accuracy is improved; compared with the traditional volute, the novel structure is simpler, the processing technology can be simplified, the processing cost and the period are saved, the size is more simplified, the space requirement is small, the installation and the debugging are convenient and quick, and the test preparation time is shortened; the adjustment precision and efficiency of the test state are improved, so that the test duration is shortened, the high rotating speed and the unstable working condition operation time of the air compressor test piece are reduced, the test operation risk is reduced, the test efficiency is improved, and the test cost is saved; in the test process, the high-pressure cooling gas effectively controls the temperature of the gas collection chamber, and avoids the thermal deformation of the power transmission device.
Drawings
The above and other features, properties and advantages of the present utility model will become more apparent from the following description in conjunction with the accompanying drawings and embodiments, in which:
fig. 1 is a front view of an axial flow compressor tester exhaust gas collector.
Fig. 2 is a cross-sectional view taken along line I-I of fig. 1.
Detailed Description
The following discloses a number of different embodiments or examples of implementing the subject technology. Specific examples of components and arrangements are described below for purposes of simplifying the disclosure, and of course, these are merely examples and are not intended to limit the scope of the utility model. For example, a first feature described later in this specification may be formed above or on a second feature, and may include embodiments in which the first and second features are formed in direct contact, as well as embodiments in which additional features may be formed between the first and second features, such that no direct contact may be made between the first and second features. In addition, the disclosure may repeat reference numerals and/or letters in the various examples. 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. Further, where a first element is described as being coupled or combined with a second element, the description includes embodiments in which the first and second elements are directly coupled or combined with each other, and also includes embodiments in which one or more other intervening elements are added to indirectly couple or combine the first and second elements with each other.
As shown in fig. 1 and 2, an exhaust gas collecting device of an axial flow compressor tester comprises a gas collecting chamber inner annular wall 1, a gas collecting chamber outer annular wall 2, an exhaust main pipeline 3 and a pressure regulating device 6 thereof, an exhaust bypass 4 and a pressure regulating device 7 thereof, and a cooling device 5. The inner annular wall 1 of the gas collection chamber and the outer annular wall 2 of the gas collection chamber form an annular gas collection chamber.
During the compressor test, exhaust axially flows into the gas collection chamber from the left side in fig. 2, is radially discharged through the exhaust main pipeline 3 and the exhaust bypass 4, and the pressure regulating mechanisms 6 and 7 are respectively arranged on the exhaust main pipeline 3 and the exhaust bypass 4, so that the pressure ratio regulation requirement of the compressor test can be realized. The cross-sectional area of the flow channel of the exhaust main pipeline 3 is larger than that of the exhaust bypass 4, and the adjustment precision required by the test is realized through the exhaust bypass 4.
As shown in fig. 2, the annular plenum has a closed end at the right end and an open end at the left end in the axial direction. In fig. 2, the main exhaust port 31 is shown in the circumferential direction, but the bypass exhaust port 41 is not shown. The main exhaust interface 31 and the bypass exhaust interface 41 are shown in fig. 1.
The annular plenum has a plenum port at the left end open end for connection to a test piece, which in fig. 1 and 2 includes connecting flanges 11, 21 located on the plenum inner and outer annular walls 1, 2. The inner ring surface of the volute and the test piece of the compressor are mostly in the form of spigot lap joint, so that air leakage is easy, and the problems can be overcome by adopting a connecting flange.
As shown in fig. 1 and 2, the inner annular wall 1 of the air collection chamber and the outer annular wall 2 of the air collection chamber are annular cylinders, the outer annular wall 2 of the air collection chamber is provided with an end plate 22 at the closed end of the annular air collection chamber, bolt holes are formed in the end plate, the right end of the inner annular wall 1 of the air collection chamber is fixed on the end plate 22 of the outer annular wall 2 of the air collection chamber through bolts, the inner annular wall 1 of the air collection chamber and the outer annular wall 2 of the air collection chamber form an annular air collection chamber together, and the front ends of the inner annular wall 1 of the air collection chamber and the outer annular wall 2 of the air collection chamber are flange interfaces for fixing test pieces. The cylinder body of the outer annular wall 2 of the gas collection chamber is provided with a gas outlet, and a main gas outlet interface 31 and a bypass gas outlet interface 41 for connecting the main gas exhaust pipeline 3 and the gas bypass 4 are arranged.
The straight line of the inner annular wall 1 of the gas collection chamber and the outer annular wall 2 of the gas collection chamber ensures the axial exhaust requirement of the gas compressor, can reduce the flow resistance and loss of the exhaust, reduces the cavity effect, ensures the uniformity of the outlet flow field, and meanwhile, compared with a volute type gas collection chamber, the structure has simpler processing and small occupied space.
As shown in FIG. 1, the exhaust main pipeline 3 and the exhaust bypass 4 are of different sizes, and are respectively provided with pressure regulating devices 6 and 7, so that the requirements of rough adjustment and fine adjustment of the pressure ratio of the compressor can be met, and the test precision is improved. The pressure regulating devices 6 and 7 may be butterfly valves or the like.
The design of the molded lines of the exhaust main pipeline 3 and the exhaust bypass 4 can be designed by adopting the principle of minimum exhaust loss, for example, a simulation model of the exhaust gas collecting device of the axial flow compressor tester is built in CFD software, so that the optimization is carried out by minimum exhaust loss, and the molded lines of the exhaust main pipeline 3 can be determined. In fig. 1, a molded line of the exhaust main pipe 3 is shown, but the molded line is not limited thereto, and may be variously changed according to the test requirements and the model of the test piece. For example, the exhaust main pipe 3 and the exhaust bypass 4 extend obliquely upwards, and do not extend perpendicular to the annular gas collection chamber, and the exhaust main pipe 3 extends obliquely and then extends vertically, so that the change is beneficial to reducing exhaust loss. In addition, the design in detail can be further performed to raise the flow pressure, for example, the main exhaust port 31 is in a conical port or a tapered shape, so that the air flow can be accelerated and discharged, and the exhaust is finally converted into radial discharge. For example, the exhaust main pipeline 3 is provided with a flexible connecting structure, so that micro deformation can be compensated, and exhaust loss can be reduced.
The main exhaust line 3 and the exhaust bypass 4 are connected to an exhaust tower above the annular plenum, which is not shown in the figures. The exhaust main line 3 and the exhaust bypass 4 may be connected to the exhaust tower, respectively, or as shown in fig. 1, the exhaust bypass 4 may be merged into the exhaust main line 3 and then connected to the exhaust tower together.
An inlet port 32 is provided in the exhaust main pipe 3, and an inlet port 32 is connected to the end of the exhaust bypass 4, and the inlet port 32 is provided downstream of the pressure regulator 31. The main exhaust line 3 further comprises a diverging section 33 arranged on the upstream side of the inlet 32, the diverging section 33 slowing down the flow so as to merge into the exhaust gases which are fed by its bypass 4.
The exhaust main pipeline 3 further comprises a tapered section 34 arranged at the tail end, and the tapered section 34 is favorable for rapid exhaust of exhaust gas so as to jet gas in the exhaust tower, so that the gas flow is smoothly exhausted out of the exhaust tower.
As shown in fig. 2, the power transmission device 8 between the tester and the test piece passes through the inner plenum ring wall 1, specifically through the central hole of the end plate 22 of the outer plenum ring wall 2, and one embodiment of the power transmission device 8 is a diaphragm coupling. In the test process of the air compressor, high-temperature exhaust can lead to the rise of the wall temperature of the air collection chamber, in order to prevent the corrosion of high temperature to the power transmission device 8, the cooling device 5 is arranged in the inner annular wall 1 of the air collection chamber, the structure is in a straight pipe shape, a radial exhaust pipe is processed and installed on a pipe body, an exhaust port is aligned to the power transmission device 8, the cooling device 5 is additionally installed on the end plate 22 of the outer annular wall 2 of the air collection chamber through a clamp, and in the test, high-pressure cooling air is continuously sprayed by the cooling device 5, so that the temperature of a shafting can be reduced, and the thermal deformation is avoided.
While the utility model has been described in terms of preferred embodiments, it is not intended to be limiting, but rather to the utility model, as will occur to those skilled in the art, without departing from the spirit and scope of the utility model. Therefore, any modification, equivalent variation and modification of the above embodiments according to the technical substance of the present utility model fall within the protection scope defined by the claims of the present utility model.
Claims (10)
1. The utility model provides an axial compressor tester exhaust gas collection device which characterized in that includes:
the annular gas collection chamber comprises an inner annular wall and an outer annular wall which are all provided with straight molded lines, wherein the annular gas collection chamber is provided with a closed end, an open end and a main gas exhaust interface and a bypass gas exhaust interface in the axial direction, and the open end is provided with a gas collection interface connected with a test piece;
the main exhaust pipeline is connected with the main exhaust interface and is provided with a main pipeline pressure regulating device; and
an exhaust bypass, which is connected with the bypass exhaust interface and is provided with a bypass pressure regulating device;
the cross-sectional area of the exhaust main pipe is larger than that of the exhaust bypass.
2. The exhaust gas collecting device of the axial flow compressor tester according to claim 1, wherein the exhaust main pipe is provided with an inlet port, the end of the exhaust bypass is connected to the inlet port, and the inlet port is located at the downstream side of the main pipe pressure regulating device.
3. The axial flow compressor tester exhaust gas collector of claim 2, wherein the main exhaust interface is tapered.
4. The axial compressor tester exhaust gas collector of claim 3, wherein said exhaust main conduit includes a diverging section on an upstream side of said inlet interface.
5. The exhaust and gas collection device of the axial flow compressor tester according to claim 1 or 4, wherein the axial direction of the annular gas collection chamber is horizontally arranged, and the exhaust main pipeline extends obliquely upward from the annular gas collection chamber and then extends vertically upward.
6. The axial compressor tester exhaust gas collector of claim 5, wherein the exhaust bypass extends obliquely upward from a side of the annular plenum opposite the exhaust main line and then merges into the exhaust main line.
7. The axial flow compressor tester exhaust gas collector of claim 1, further comprising a power transmission for connecting between the tester and the test piece;
the power transmission device axially penetrates through the inner part of the inner annular wall of the annular gas collection chamber.
8. The axial flow compressor tester exhaust gas collector of claim 7, wherein a cooling device is further provided inside the inner annular wall, and an exhaust port of the cooling device is aligned with the power transmission device.
9. The axial flow compressor tester exhaust gas collector of claim 7, wherein said outer annular wall has an end plate at said closed end, said end plate being flanged to an end of said inner annular wall and having a central bore for said power transmission means to pass through.
10. The axial compressor tester exhaust gas collector of claim 7, wherein said gas collection interface includes a connection flange disposed at said open end at said inner and outer annular walls.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011041536.XA CN114323652B (en) | 2020-09-28 | 2020-09-28 | Exhaust and gas collection device of axial-flow compressor tester |
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| CN202011041536.XA CN114323652B (en) | 2020-09-28 | 2020-09-28 | Exhaust and gas collection device of axial-flow compressor tester |
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| CN114323652B true CN114323652B (en) | 2023-10-13 |
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