An integrated exhaust system with air replenishment function

Abstract

The present invention provides an integrated exhaust system with an air replenishment function, including an exhaust volute, a dynamometer, a heat exchanger, a silencer tower and an exhaust device, wherein one end of the exhaust volute is connected to an air intake pipe, and one end of the air intake pipe away from the exhaust volute is connected to the heat exchanger, and an air transmission pipe is connected between the heat exchanger and the exhaust device. The present invention integrates the exhaust systems of conventional turbine tests and turbine tests under low Reynolds number conditions, solves the problems of complex exhaust systems and large number of equipment of turbine testers under conventional conditions and low Reynolds number conditions, integrates the exhaust system structures under the two conditions, and innovatively proposes corresponding exhaust volutes, heat exchangers, air replenishment pipes and exhaust pipe structures, which greatly reduces the number of equipment in the exhaust system, improves the compactness and economy of the vehicle platform, saves the installation and disassembly time of the two tests, reduces the probability of equipment damage, improves the reliability of the turbine test, and greatly shortens the test cycle of the two tests.

Description

Technical Field

[0001] The invention belongs to the technical field of engine turbine exhaust, and in particular relates to an integrated exhaust system with an air supplement function. Background Art

[0002] With the increasing urgency of the demand for all-weather multi-purpose aircraft, the operating environment of aircraft is becoming more and more complex, and its operating envelope is gradually expanding, which places higher requirements on the use range of engines. It has become normal for aircraft to fly at high altitudes or even ultra-high altitudes. At high altitudes, the Reynolds number decreases due to the decrease in density. The working Reynolds number of the low-pressure turbine can drop to 25,000 or even lower, which is far lower than the self-modeling Reynolds number. In this case, most of the blade surface is laminar, and the ability to resist separation is very weak. The trailing edge of the suction surface of the turbine blade often separates, resulting in a sharp drop in turbine efficiency. Moreover, the higher the flight altitude, the lower the Reynolds number, and the more serious the trend of efficiency decline.

[0003] Therefore, in order to understand the working principle of the engine under different conditions, relevant turbine performance tests are often carried out during the design process. The working principles and test requirements of turbine tests under conventional environments and low Reynolds number environments are completely different. Under low Reynolds number conditions, the inlet pressure is often negative pressure, and the test requires exhaust at the exhaust port, while the inlet pressure of conventional tests reaches several or even dozens of atmospheres, requiring a separate air supply station, and only normal exhaust is required. Turbine tests under both conditions require two independent exhaust systems or test benches, which makes the entire turbine test bench system more complicated, the test cycle is long, and the economy is also poor.

[0004] The existing test equipment requires two complete intake systems, exhaust systems, and two dynamometers. The number of test equipment is huge, and the cycle for completing the two tests is long, which greatly increases the complexity of the vehicle equipment, reduces the reliability of the test, and is also very poor in economic benefits. Summary of the invention

[0005] In view of the above problems, the present invention provides an integrated exhaust system with an air replenishing function.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] An integrated exhaust system with air supplement function, comprising an exhaust volute, a dynamometer, a heat exchanger, a muffler tower and an air extraction device;

[0008] One end of the exhaust volute is connected to an air intake pipe, and one end of the air intake pipe away from the exhaust volute is connected to a heat exchanger;

[0009] A gas pipeline is connected between the heat exchanger and the air extraction device;

[0010] The middle section of the gas transmission pipeline is connected to an exhaust pipeline;

[0011] One end of the exhaust pipe is connected to the muffler tower;

[0012] The dynamometer is connected to the other end of the exhaust volute.

[0013] Preferably, the integrated exhaust system further comprises a stand for mounting the exhaust volute and the dynamometer.

[0014] Preferably, the integrated exhaust system further comprises a plurality of brackets, and the brackets are used to support the gas supply pipeline and the exhaust pipeline.

[0015] Preferably, the gas pipeline is also connected to a gas bypass, and the inlet and outlet of the gas bypass are both connected to the gas pipeline.

[0016] Preferably, the gas bypass is located between the heat exchanger and the exhaust pipe.

[0017] Preferably, a second valve is installed on the gas transmission bypass.

[0018] Preferably, the gas pipeline is installed with a first valve and a third valve, the first valve is located between the inlet and the outlet of the gas bypass, and the third valve is located between the air extraction device and the exhaust pipeline.

[0019] Preferably, the gas delivery pipeline is also connected to an air supply pipeline, and the air supply pipeline is located between the first valve and the third valve.

[0020] Preferably, a fifth valve is installed on the air supply pipeline, and a fourth valve is installed on the exhaust pipeline.

[0021] Preferably, a support plate is provided inside the exhaust volute for controlling the exhaust velocity and the performance of the exhaust flow field, and for maintaining the structural rigidity of the volute.

[0022] Beneficial effects of the present invention:

[0023] The present invention integrates the exhaust systems of conventional turbine tests and turbine tests under low Reynolds number conditions, solves the problems of complex exhaust systems and large number of equipment in turbine testers under conventional conditions and low Reynolds number conditions, integrates the exhaust system structures under the two conditions, and innovatively proposes corresponding exhaust volutes, heat exchangers, air supply pipes and exhaust pipe structures, which greatly reduces the number of equipment in the exhaust system, improves the compactness and economy of the vehicle platform, saves the installation and disassembly time of the two tests, reduces the probability of equipment damage, improves the reliability of the turbine test, and greatly shortens the test cycle of the two tests.

[0024] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A schematic structural diagram of an integrated exhaust system with an air replenishment function according to the present invention is shown;

[0027] Figure 2 A connection diagram of an integrated exhaust system with an air supply function according to the present invention is shown;

[0028] Figure 3 A structural diagram of the exhaust volute of the present invention is shown;

[0029] Figure 4 A diagram showing the connection relationship between the exhaust volute of the present invention and the test piece;

[0030] Figure 5 The blade flow field diagram under the conventional environment (high Reynolds number) of the present invention is shown;

[0031] Figure 6 The blade flow field diagram under low Reynolds number of the present invention is shown;

[0032] Figure 7 The operating relationship diagram of the present invention in a conventional environment and a low Reynolds number environment is shown;

[0033] Figure 8 The schematic structural diagram of the air supply device connected to the air supply pipeline of the present invention is shown.

[0034] In the figure: 1. test bench; 2. exhaust volute; 3. dynamometer; 4. heat exchanger; 5. silencer tower; 6. exhaust device; 7. first valve; 8. bracket; 9. second valve; 10. third valve; 11. fourth valve; 12. fifth valve; 13. air supply pipeline; 14. air intake pipeline; 15. air transmission pipeline; 16. air transmission bypass; 17. exhaust pipeline. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] An integrated exhaust system with air replenishment function, such as Figure 1 As shown, it includes an exhaust volute 2, a dynamometer 3, a heat exchanger 4, a silencer tower 5 and an exhaust device 6; wherein, one end of the exhaust volute 2 is connected to an intake pipe 14, and the end of the intake pipe 14 away from the exhaust volute 2 is connected to the heat exchanger 4. In addition, a support plate is arranged inside the exhaust volute 2 for controlling the exhaust speed and the performance of the exhaust flow field, and also for effectively maintaining the rigidity of the volute in structure.

[0037] It should be noted that the exhaust volute 2 generally adopts a constant flow rate design and a top surface exhaust method, and the internal air flow velocity is limited to within 50m / s.

[0038] An air pipeline 15 is connected between the heat exchanger 4 and the air extraction device 6 ; the air extraction device 6 is composed of a plurality of centrifugal air extractors, and is used to provide a negative pressure environment for the test piece during the simulation test.

[0039] The middle section of the gas pipeline 15 is connected to an exhaust pipeline 17;

[0040] One end of the exhaust pipe 17 is connected to the muffler tower 5;

[0041] The dynamometer 3 is connected to the other end of the exhaust volute 2 .

[0042] It should be noted that when conducting the experiment, the test piece will be connected to the exhaust volute 2, and then the dynamometer 3 is used to absorb the power emitted by the test piece and display the test power. The airflow enters from the exhaust volute 2, then enters the heat exchanger 4, and finally enters the silencer tower 5 or the exhaust device 6.

[0043] Furthermore, it also includes a test bench 1, which is used to install the exhaust volute 2 and the dynamometer 3.

[0044] It should be noted that the dynamometer 3 is arranged on one side of the exhaust volute 2, and a disassembly track is generally provided on the test bench 1 for the installation and disassembly of the exhaust volute 2 and the dynamometer 3. The track can be pushed up and down and moved left and right, and can be adaptively adjusted according to the size of the test piece and the vehicle equipment.

[0045] Furthermore, a plurality of brackets 8 are included, and the brackets 8 are used to support the gas supply pipeline 15 and the exhaust pipeline 17 .

[0046] It should be noted that the bracket 8 mainly plays a supporting role to ensure stable operation of the device of the entire system.

[0047] Furthermore, the gas pipeline 15 is also connected to a gas bypass 16 , the inlet and outlet of the gas bypass 16 are both connected to the gas pipeline 15 , the gas bypass 16 is located between the heat exchanger 4 and the exhaust pipeline 17 , and a second valve 9 is installed on the gas bypass 16 .

[0048] It should be noted that the gas transmission bypass 16 and the second valve 9 are mainly used in conjunction with the gas transmission pipeline 15 and the first valve 7 to adjust the outlet pressure of the test piece.

[0049] Furthermore, the gas pipeline 15 is installed with a first valve 7 and a third valve 10 . The first valve 7 is located between the inlet and the outlet of the gas bypass 16 , and the third valve 10 is located between the air extraction device 6 and the exhaust pipeline 17 .

[0050] Furthermore, the gas delivery pipeline 15 is also connected to a gas supplement pipeline 13 , and the gas supplement pipeline 13 is located between the first valve 7 and the third valve 10 .

[0051] Furthermore, a fifth valve 12 is installed on the air supply pipeline 13 , and a fourth valve 11 is installed on the air exhaust pipeline 17 .

[0052] It should be noted that the air supply pipe 13 is connected to the outside atmosphere, and the air extraction device 6 is divided into two types of devices: variable frequency and fixed frequency. The variable frequency is less used due to its high price, while the fixed frequency air extraction device 6 is more used in the vehicle platform. The disadvantage of the fixed frequency air extraction device 6 is that once the air extraction volume is given, the air volume must reach the set value. During the test, the air extraction device 6 may be in a suffocating state due to blockage of the test piece or insufficient air intake, which is very easy to damage the equipment. After the air supply pipe 13 is arranged, the air volume can be replenished in time in the suffocating state, which effectively solves this problem and is extremely economical.

[0053] It should be further explained that the pipelines are connected by flanges, and the flanges are all connected by convex face welded steel pipe flanges. The heat exchanger 4 cools the airflow and stabilizes the exhaust airflow. The heat exchanger 4 is fixed with anchor bolts, and the other brackets 8 are all guide brackets, so that the pipeline can be freely extended and moved when it expands due to heat, making full use of the pipeline itself to absorb thermal stress. The exhaust volute 2, the air intake pipeline 14, and the gas transmission pipeline 15 are covered with an insulation layer.

[0054] like Figure 2 As shown, the working process of the integrated exhaust system of the present invention is as follows:

[0055] When conducting a conventional turbine performance test, the air flow enters the exhaust volute 2 from the test piece, then enters the intake pipe 14, and then enters the heat exchanger 4. The third valve 10 and the fifth valve 12 are closed, and the first valve 7 and the fourth valve 11 are opened. The gas is directly discharged into the silencer 5 through the fourth valve 11. The outlet pressure of the test piece is changed by adjusting the first valve 7 and the second valve 9 to obtain the expansion ratio required for the test, wherein the first valve 7 performs a coarse adjustment on the pressure, and the second valve 9 performs a fine adjustment on the test pressure.

[0056] When conducting a low Reynolds number test, the first valve 7, the second valve 9 and the fourth valve 11 are closed, and the third valve 10 and the fifth valve 12 are fully opened. At this time, the air extraction device 6 starts to work, and the air extractor extracts air from the outside atmosphere (flowing in through the fifth valve 12). During the test, the first valve 7 is slowly opened and the fifth valve 12 is closed, thereby reducing the outlet pressure of the test piece. The outlet pressure of the test piece is changed by adjusting the first valve 7, the second valve 9 and the fifth valve 12, wherein the second valve 9 is used to finely adjust the outlet pressure.

[0057] like Figure 3 As shown, the exhaust volute 2 is a hollow structure, with a through hole at the center thereof penetrating the exhaust volute 2, rectangular openings at the peripheral side thereof, and flanges at the openings, and ribs are also provided on the lower side of the flange of the exhaust volute 2 to improve the internal structural strength of the exhaust volute 2.

[0058] like Figure 4 As shown, when performing a turbine test, the test piece is connected to the exhaust volute 2, wherein the test piece includes a turbine shaft and turbine blades, the turbine blades are mounted on the turbine shaft, and then the turbine shaft is connected to the dynamometer 3 for transmitting the power of the turbine test.

[0059] like Figure 5 As shown, the blade flow field under normal conditions is demonstrated. Under normal conditions, the air density is high, the Reynolds number is large during operation, the airflow on the blade surface is in a turbulent flow state, and has a strong anti-separation ability. Therefore, the flow on the blade surface is relatively uniform and the overall streamline is better.

[0060] like Figure 6 As shown, the blade flow field under low Reynolds number is displayed. When the aircraft is working in a high-altitude environment, the air density drops sharply, the Reynolds number decreases, and the flow on the blade surface is in laminar flow. However, the laminar flow has very weak anti-separation ability. When the airflow flows from the leading edge of the blade to the trailing edge of the blade, as the pressure gradient increases, a large area of ​​open separation occurs near the trailing edge of the back of the blade, and there is an obvious separation bubble in the figure.

[0061] like Figure 7As shown, the test processes under conventional environment and low Reynolds number conditions are independent of each other, and the integrated system environment of the present invention integrates the two into a set of equipment, which greatly reduces the number of equipment, reduces the complexity of the equipment, and is conducive to cost saving.

[0062] It should be noted that the air supply pipeline 13 is generally connected to an air supply device via a flange, such as Figure 8 As shown, the air supply device includes an air filter, a silencer and an air inlet. When testing under a low Reynolds number environment, the air supply device needs to be turned on to prevent suffocation due to blockage of the test piece or insufficient air intake. When the air supply device is in operation, the outside atmosphere enters the silencer through the air inlet (including filtering function) to reduce the noise of the air supply. After passing through the silencer, the air enters the air filter along the pipeline for fine filtration. After filtration, the gas will enter the air supply pipeline 13. The outlet pressure during the test can be adjusted in time according to the amount and pressure of air supply, while ensuring the normal operation of the vacuum pump during the low Reynolds number environment test.

[0063] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An integrated exhaust system with air replenishment function, characterized in that: It comprises an exhaust volute (2), a dynamometer (3), a heat exchanger (4), a silencer tower (5) and an air extraction device (6); One end of the exhaust volute (2) is connected to an air intake pipe (14), and one end of the air intake pipe (14) away from the exhaust volute (2) is connected to a heat exchanger (4); A gas pipeline (15) is connected between the heat exchanger (4) and the gas extraction device (6); The middle section of the gas delivery pipeline (15) is connected to an exhaust pipeline (17); One end of the exhaust pipe (17) is connected to the muffler tower (5); The dynamometer (3) is connected to the other end of the exhaust volute (2); The gas pipeline (15) is also connected to a gas bypass (16), and the inlet and outlet of the gas bypass (16) are both connected to the gas pipeline (15); The gas transmission pipeline (15) is installed with a first valve (7) and a third valve (10), wherein the first valve (7) is located between the inlet and the outlet of the gas transmission bypass (16), and the third valve (10) is located between the gas extraction device (6) and the exhaust pipeline (17); The gas delivery pipeline (15) is also connected to a gas supplement pipeline (13), and the gas supplement pipeline (13) is located between the first valve (7) and the third valve (10).

2. The integrated exhaust system with air replenishment function according to claim 1, characterized in that: It also comprises a stand (1), wherein the stand (1) is used to install the exhaust volute (2) and the dynamometer (3).

3. The integrated exhaust system with air replenishment function according to claim 1, characterized in that: It also comprises a plurality of brackets (8), wherein the brackets (8) are used to support the gas supply pipeline (15) and the exhaust pipeline (17).

4. The integrated exhaust system with air supplement function according to claim 1, characterized in that: The gas transmission bypass (16) is located between the heat exchanger (4) and the exhaust pipe (17).

5. The integrated exhaust system with air supplement function according to claim 1, characterized in that: A second valve (9) is installed on the gas transmission bypass (16).

6. The integrated exhaust system with air supplement function according to claim 1, characterized in that: The air supply pipeline (13) is provided with a fifth valve (12), and the air exhaust pipeline (17) is provided with a fourth valve (11).

7. An integrated exhaust system with air replenishment function according to any one of claims 1 to 6, characterized in that: The exhaust volute (2) is provided with a support plate inside, which is used to control the exhaust speed and the performance of the exhaust flow field, and is also used to maintain the rigidity of the volute in structure.

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