Device for high-temperature gas cooling and backflow suppression of exhaust diffuser asymmetric jet

Abstract

The application provides a device for exhaust diffuser asymmetric jet high-temperature gas cooling and backflow suppression, belonging to the technical field of aero-engines, comprising a backflow suppression baffle ring, a replaceable injection cylinder, a water spraying cooling assembly and a replaceable inner baffle ring, the backflow suppression baffle ring is installed at the inlet of the exhaust diffuser, and a first cooling water assembly is arranged outside the backflow suppression baffle ring; the replaceable inner baffle ring is installed at the middle region inside the backflow suppression baffle ring, a second cooling water assembly is arranged on the replaceable inner baffle ring, and different replaceable inner baffle rings are used to adjust the inner diameter of the backflow suppression baffle ring; the replaceable injection cylinder is installed outside the backflow suppression baffle ring as a secondary exhaust diffuser, and the length, shape and diameter of the replaceable injection cylinder are adjustable; and the water spraying cooling assembly is installed inside the backflow suppression baffle ring and located outside the replaceable inner baffle ring, and the water spraying cooling assembly sprays atomized cooling water with adjustable spraying and sprinkling angles and ranges. The device effectively suppresses the backflow of high-temperature gas, prolongs the service life of the equipment and has strong adaptability.

Description

Technical Field

[0001] This application relates to the field of aero-engine technology, and in particular to a device for cooling and suppressing backflow of high-temperature gas in an asymmetric jet of an exhaust diffuser. Background Technology

[0002] As the requirements for nozzle performance and function continue to increase, nozzle structures are becoming more complex, exhaust temperatures are rising, and exhaust methods are becoming more complex, with asymmetric jet exhaust methods gradually becoming more prevalent. Traditional exhaust diffusers are cylindrical and symmetrical; however, when the nozzle produces an asymmetric jet, such as... Figure 1 As shown, the negative pressure zone generated by the asymmetric jet will cause the high-temperature gas ejected from the nozzle to flow back. This backflow is even more severe in confined or enclosed spaces, and the backflowing high-temperature gas will damage the nozzle structure and testing equipment, impacting the safety of the nozzle, equipment, and personnel. Therefore, how to utilize existing traditional symmetric nozzle testing equipment to complete asymmetric jet nozzle tests is an urgent problem to be solved. Summary of the Invention

[0003] In view of this, the present application provides a device for cooling and suppressing high-temperature gas flow in an asymmetric jet of an exhaust diffuser, which at least partially solves the problem of high-temperature gas flow during asymmetric jet nozzle tests on conventional test benches.

[0004] This application provides a device for cooling and suppressing backflow of high-temperature combustion gas in an asymmetric jet of an exhaust diffuser. The device includes a backflow suppression ring, a replaceable ejector tube, a water spray cooling assembly, and a replaceable inner ring. The backflow suppression ring is installed at the inlet of the exhaust diffuser, and a first cooling water assembly is provided on the outer side of the backflow suppression ring to block the high-temperature combustion gas in the high-temperature backflow zone. The replaceable inner ring is installed in the middle region inside the backflow suppression ring, and has a through hole in the middle. The replaceable inner ring is provided with a design for... The second cooling water assembly, which cools the baffle ring, allows for adjustment of the inner diameter of the backflow suppression baffle ring by replacing different replaceable inner baffle rings. A replaceable ejector tube is installed on the outside of the backflow suppression baffle ring as a secondary exhaust diffuser. The replaceable ejector tube corresponds to the position of the through hole, and its length, shape, and diameter are all adjustable. The water spray cooling assembly is installed on the inside of the backflow suppression baffle ring, located on the outer ring of the replaceable inner baffle ring. The water spray cooling assembly sprays atomized cooling water, and the spray angle and spray range of the atomized cooling water are adjustable.

[0005] According to a specific implementation of this application, the backflow suppression baffle ring includes a baffle plate, which is formed by splicing two half-rings. The first cooling water assembly includes an inner ring water supply interface, an outer ring water outlet interface, and inner and outer ring cooling water baffles. The inner and outer ring cooling water baffles are respectively disposed on the two half-rings, dividing each half-ring into an inner ring and an outer ring. One end of the inner and outer ring cooling water baffles is flush with the edge of the first end of the half-ring, and the other end of the inner and outer ring cooling water baffles leaves a gap with the edge of the second end of the half-ring. The first ends of the two half-rings are spliced ​​together, and the second ends of the two half-rings are spliced ​​together. The inner ring water supply interface is located in the inner ring of the first end of each half-ring, and the outer ring water outlet interface is located in the outer ring of the first end of each half-ring.

[0006] According to a specific implementation of an embodiment of this application, the first cooling water assembly further includes a built-in temperature sensor and an adaptive regulating valve. Each inner ring water supply interface is connected to the adaptive regulating valve, and the built-in temperature sensor is located on the inner ring of each half ring. The built-in temperature sensor is communicatively connected to the adaptive regulating valve.

[0007] According to a specific implementation of the present application, each half-ring is provided with a water spray pipe supply interface on its inner ring. The water spray pipe supply interface is connected to the water spray cooling component, supplying cold water from the outside of the baffle to the water spray cooling component.

[0008] According to a specific implementation of an embodiment of this application, the water spray cooling component includes a water supply ring, a water supply ring interface, a nozzle, and a mounting base. The water supply ring has a ring-shaped structure. The mounting base is connected to the side of the water supply ring facing the center. The bottom of the mounting base is connected to a backflow suppression ring. One end of the water supply ring interface is connected to the water supply ring, and the other end of the water supply ring interface is connected to the water supply interface of the spray pipe. The nozzle is disposed on the water supply ring and sprays atomized cooling water through the nozzle.

[0009] According to a specific implementation of this application, the nozzle includes a nozzle base, a nozzle cap, a nozzle adapter, and an atomizing nozzle. The nozzle base is connected to a water supply ring, and the bottom of the nozzle base has an opening through which water from the water supply ring is supplied to the nozzle adapter and the atomizing nozzle. The nozzle cap fixes the nozzle adapter on the nozzle base, and the nozzle adapter slides along the nozzle base to adjust the angle between the nozzle centerline and the exhaust diffuser axis, thereby adjusting the spray angle. The atomizing nozzle is fixed on the nozzle adapter, and the spray hole on the atomizing nozzle has a non-circular structure. The atomizing nozzle rotates along the centerline of the nozzle adapter to adjust the spray range of the atomizing nozzle along the exhaust diffuser axis.

[0010] According to one specific implementation of the present application, the nozzle orifice shape is set to an ellipse with pointed ends.

[0011] According to a specific implementation of the present application, the nozzle adapter includes a root and a rod. The root is located between the nozzle base and the nozzle cap. The nozzle cap is provided with a strip hole. The rod extends out of the strip hole and connects to the atomizing nozzle. The root slides on the spherical surface of the nozzle base, causing the rod to swing within the strip hole, thereby adjusting the spray angle.

[0012] According to a specific implementation of the present application, the central axis of the nozzle is not perpendicular to the plane where the water supply ring is located, and the central axis of the nozzle is inclined toward the center of the water supply ring.

[0013] According to a specific implementation of an embodiment of this application, the replaceable inner retaining ring includes a mounting plate. The replaceable inner retaining ring is mounted on the inner side of the backflow suppression retaining ring via the mounting plate. The second cooling water assembly is disposed on the inner side of the mounting plate. The second cooling water assembly includes a water supply port, a water outlet, and a cooling ring. The cooling ring is arranged in a ring shape along the circumferential direction of the mounting plate. One end of the cooling ring is connected to the water supply port, and the other end of the cooling ring is connected to the water outlet.

[0014] Beneficial effects:

[0015] The high-temperature gas cooling and backflow suppression device for asymmetric jet exhaust diffuser in this embodiment effectively suppresses the backflow of high-temperature gas during asymmetric jet nozzle testing in traditional test devices by setting backflow suppression baffle rings and replaceable inner baffle rings. It can meet the testing requirements of asymmetric jet nozzles or whole engines in confined spaces. The inner diameter, length, and distance from the nozzle of the exhaust diffuser can be adjusted to adapt to asymmetric jet nozzle tests of different sizes, lengths, flow rates, and deflection methods, demonstrating strong adaptability. By setting replaceable ejector tubes, it can adapt to different sizes, lengths, flow rates, and deflection methods of jets, efficiently guiding the nozzle airflow, avoiding high-temperature exhaust gas backflow, and reducing the temperature of the test chamber. By setting water spray cooling components, the spray angle and range can be adjusted to cool the high-temperature exhaust gas of irregularly shaped nozzles, resulting in good cooling effect and low energy consumption. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of high-temperature gas recirculation in a confined space using existing technology for asymmetric jet flow.

[0018] Figure 2 This is a schematic diagram of a device for cooling and suppressing high-temperature gas flow in an asymmetric jet of an exhaust diffuser, according to an embodiment of the present invention.

[0019] Figure 3 This is a structural diagram of a device for cooling and suppressing high-temperature combustion gas in an asymmetric jet of an exhaust diffuser, according to an embodiment of the present invention.

[0020] Figure 4 This is a schematic diagram of the incoming flow front end of an exhaust diffuser asymmetric jet high-temperature gas cooling and backflow suppression device according to an embodiment of the present invention.

[0021] Figure 5 This is a schematic diagram of the inlet flow rear end of an exhaust diffuser asymmetric jet high-temperature gas cooling and backflow suppression device according to an embodiment of the present invention.

[0022] Figure 6 This is a schematic diagram of a backflow suppression retaining ring according to an embodiment of the present invention;

[0023] Figure 7 This is a schematic diagram of a replaceable ejector tube according to an embodiment of the present invention;

[0024] Figure 8 This is a schematic diagram of a water spray cooling assembly according to an embodiment of the present invention;

[0025] Figure 9 This is a schematic diagram of a nozzle according to an embodiment of the present invention;

[0026] Figure 10 A cross-sectional view of a nozzle according to an embodiment of the present invention;

[0027] Figure 11 This is a schematic diagram illustrating the adjustment of the nozzle spray range according to an embodiment of the present invention;

[0028] Figure 12 This is a schematic diagram illustrating the adjustment of the spray range of another nozzle according to an embodiment of the present invention;

[0029] Figure 13 This is a schematic diagram of a replaceable inner retaining ring according to an embodiment of the present invention.

[0030] In the diagram: 1. Backflow suppression ring; 2. Replaceable ejector tube; 3. Water spray cooling assembly; 4. Replaceable inner ring; 1-1. Baffle; 1-2. Built-in temperature sensor; 1-3. Adaptive regulating valve; 1-4. Inner ring water supply interface; 1-5. Outer ring water outlet interface; 1-6. Water spray pipe water supply interface; 1-7. Inner and outer ring cooling water baffles; 2-1. Ejector tube; 2-2. Mounting edge; 3-1. Water supply ring; 3-2. Water supply ring interface; 3-3. Nozzle; 3-3-1. Nozzle base; 3-3-2. Nozzle cap; 3-3-3. Nozzle adapter; 3-3-4. Atomizing nozzle; 3-4. Mounting base; 4-1. Water supply port; 4-2. Water outlet; 4-3. Cooling ring; 4-4. Mounting plate; 5. First asymmetric nozzle; 6. Second asymmetric nozzle. Detailed Implementation

[0031] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0032] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0034] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The illustrations only show the components related to this application and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0035] Furthermore, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the described aspects can be practiced without these specific details.

[0036] This application addresses the problem of high-temperature gas backflow in asymmetric jet nozzles by proposing a device for cooling and suppressing high-temperature gas backflow in asymmetric jet nozzles of exhaust diffusers. This device guides the exhaust gas flow from irregularly shaped nozzles, suppressing the backflow phenomenon. It cools the high-temperature gas in different ways depending on the nozzle's jet pattern, achieving good cooling effect with low energy consumption. The device can meet the testing requirements of asymmetric jet nozzles of different lengths and sizes, adaptively adjusts the cooling water flow rate, is safe and reliable, energy-saving and environmentally friendly, and can meet the testing requirements of asymmetric jet nozzles based on existing testing equipment. The following refers to... Figures 2 to 13 Provide a detailed description.

[0037] In one embodiment, refer to Figures 2 to 5 A device for cooling and suppressing backflow of high-temperature combustion gas in an asymmetric jet of an exhaust diffuser includes a backflow suppression ring 1, a replaceable ejector tube 2, a water spray cooling assembly 3, and a replaceable inner ring 4. The backflow suppression ring 1 is installed at the inlet of the exhaust diffuser, and a first cooling water assembly is provided on the outer side of the backflow suppression ring 1 to block the high-temperature combustion gas in the high-temperature backflow zone. The replaceable inner ring 4 is installed in the middle area inside the backflow suppression ring 1, and a through hole is provided in the middle of the replaceable inner ring 4. The replaceable inner ring 4 is equipped with cooling devices. The second cooling water assembly allows for adjustment of the inner diameter of the backflow suppression ring 1 by replacing different replaceable inner baffle rings 4. The replaceable ejector tube 2 is installed on the outside of the backflow suppression ring 1 as a secondary exhaust diffuser. The replaceable ejector tube 2 corresponds to the position of the through hole, and its length, shape, and diameter are all adjustable. The water spray cooling assembly 3 is installed on the inside of the backflow suppression ring 1 and is located on the outer ring of the replaceable inner baffle ring 4. The water spray cooling assembly 3 sprays atomized cooling water, and the spray angle and spray range of the atomized cooling water are adjustable.

[0038] In this embodiment, the device is an upgrade of an existing testing device, with a simple structure and minimal equipment modification. By incorporating a replaceable ejector tube 2, a water spray cooling component 3, and a replaceable inner retaining ring 4, it can meet the testing requirements of asymmetric jet nozzles of different sizes, lengths, flow rates, deflection methods, and shapes. Figure 2 As shown, it can guide the airflow of asymmetric jet nozzles, effectively suppress the backflow of high-temperature gas in asymmetric jet nozzles, and can adapt to different nozzle jet patterns to adjust the spray cooling angle, improve spray cooling efficiency, reduce energy consumption, and reduce the test bench temperature to the allowable temperature of the nozzle and test equipment, thus meeting the growing demand for asymmetric jet nozzle testing.

[0039] In one embodiment, the backflow suppression baffle 1 includes a baffle 1-1, which is formed by splicing two half-rings. The first cooling water assembly includes an inner ring water supply interface 1-4, an outer ring water outlet interface 1-5, and inner and outer ring cooling water baffles 1-7. The inner and outer ring cooling water baffles 1-7 are respectively disposed on the two half-rings, dividing each half-ring into an inner ring and an outer ring. One end of the inner and outer ring cooling water baffles 1-7 is flush with the edge of the first end of the half-ring, and the other end of the inner and outer ring cooling water baffles 1-7 leaves a gap with the edge of the second end of the half-ring. The first ends of the two half-rings are spliced ​​together, and the second ends of the two half-rings are spliced ​​together. The inner ring water supply interface 1-4 is located in the inner ring of the first end of each half-ring, and the outer ring water outlet interface 1-5 is located in the outer ring of the first end of each half-ring.

[0040] In one embodiment, the first cooling water assembly further includes a built-in temperature sensor 1-2 and an adaptive regulating valve 1-3. Each inner ring water supply interface 1-4 is connected to the adaptive regulating valve 1-3. The built-in temperature sensor 1-2 is located on the inner ring of each half-ring and is communicatively connected to the adaptive regulating valve 1-3.

[0041] In one embodiment, each semi-ring is provided with a water supply interface 1-6 on the inner ring, and the water supply interface 1-6 is connected to the water cooling component 3 to supply the cold water outside the baffle 1-1 to the water cooling component 3.

[0042] In specific implementation, refer to Figure 6The backflow suppression ring 1 is installed at the inlet of the exhaust diffuser. The baffle 1-1 is composed of two semi-rings joined together. The inner and outer ring cooling water baffles 1-7 divide the baffle 1-1 into inner and outer semi-rings. Cooling water flows in from the inner ring water supply port 1-4 at the bottom of the inner side of the baffle 1-1, flows along the inner ring to the top, bypasses the inner and outer ring cooling water baffles 1-7, and then flows from the top to the bottom, exiting from the outer ring water outlet port 1-5. The backflow suppression ring 1 is equipped with a built-in temperature sensor 1-2, which can measure the temperature of the baffle 1-1 in real time and provide real-time feedback to the adaptive regulating valve 1-3. The adaptive regulating valve 1-3 adjusts the water supply in real time based on the received temperature to reduce energy consumption and ensure the working temperature of the baffle 1-1. The water supply port 1-6 of the spray pipe passes through the baffle 1-1, supplying the cold water outside the baffle 1-1 to the spray cooling component 3. The backflow suppression ring 1 blocks the high-temperature combustion gas in the high-temperature backflow zone, preventing the high-temperature combustion gas from flowing into the test area and ensuring test safety.

[0043] Specifically, by installing a backflow suppression ring 1 at the exhaust diffuser, the high-temperature combustion gas backflow caused by the negative pressure zone of the asymmetric jet from the nozzle is blocked. Simultaneously, the backflow of cooling water generated by the water spray cooling assembly 3 is blocked, ensuring that the temperature and humidity in the test area remain within a safe range, thus guaranteeing the safety of the nozzle test piece and the test chamber. Cooling the backflow suppression ring 1 with cooling water prevents the high-temperature backflow combustion gas from burning the ring. Furthermore, the backflow suppression ring 1 is equipped with built-in temperature sensors 1-2 to monitor the internal temperature, and adaptive regulating valves 1-3 adjust the cooling water flow in real time, ensuring the operating temperature of the backflow suppression ring 1 while reducing energy consumption.

[0044] In one embodiment, refer to Figure 7 The length, shape, and diameter of the replaceable ejector tube 2 are adjustable. The replaceable ejector tube 2 consists of an ejector tube 2-1 and a mounting edge 2-2. The replaceable ejector tube 2 is installed outside the backflow suppression ring 1 via the mounting edge 2-2 as a secondary exhaust diffuser. The length, shape, and diameter of the ejector tube 2-1 can be adaptively adjusted for nozzles of different sizes, lengths, and shapes. The distance between the exhaust diffuser and the nozzle can be adjusted to adapt to tests with nozzles of different lengths, and it is used to eject and guide the high-temperature gas from the nozzle and the cooling airflow in the test chamber. Figure 7 As shown, the shape of the replaceable ejector tube 2 can be changed according to the shape of the first asymmetric nozzle 5 and the second asymmetric nozzle 6. The replaceable ejector tube 2 can be adjusted according to the nozzle shape by changing the length and diameter of the ejector tube 2-1, so as to guide the exhaust gas flow of the irregular nozzle and avoid the generation of vortex that causes high temperature exhaust gas backflow. It can adapt to nozzle test pieces with different lengths, sizes, flow rates and deflection jet modes, and has strong applicability.

[0045] In one embodiment, refer to Figure 8The water spray cooling component 3 includes a water supply ring 3-1, a water supply ring interface 3-2, a nozzle 3-3, and a mounting base 3-4. The water supply ring 3-1 has a ring-shaped structure. The mounting base 3-4 is connected to the side of the water supply ring 3-1 facing the center. The bottom of the mounting base 3-4 is connected to the backflow suppression ring 1. One end of the water supply ring interface 3-2 is connected to the water supply ring 3-1, and the other end of the water supply ring interface 3-2 is connected to the water supply interface 1-6 of the spray pipe. The nozzle 3-3 is set on the water supply ring 3-1, and atomized cooling water is sprayed through the nozzle 3-3.

[0046] In practical implementation, the water spray cooling assembly 3 consists of a water supply ring 3-1, a water supply ring interface 3-2, a nozzle 3-3, and a mounting base 3-4. The water spray cooling assembly 3 is installed inside the backflow suppression ring 1 via the mounting base 3-4. The water supply ring interface 3-2 is connected to the water supply interface 1-6 of the spray pipe, supplying external cooling water into the water supply ring 3-1. The cooling water is sprayed into the exhaust diffuser through the nozzle 3-3. The nozzle 3-3 atomizes the cooling water and allows adjustment of the spray angle and range to adapt to different jet angles on the nozzle test piece. It has strong cooling capacity and low energy consumption. By spraying atomized cooling water at a certain angle inside the exhaust diffuser, the water spray cooling assembly 3 achieves two effects: firstly, evaporative cooling reduces the temperature near the exhaust diffuser, ensuring test safety; secondly, by forming a water film on the surface of the exhaust diffuser, it prevents the asymmetric jet of high-temperature combustion gas from directly impacting the exhaust diffuser, thus avoiding localized heat concentration and ablation.

[0047] In one embodiment, refer to Figure 9 and Figure 10 Nozzle 3-3 includes nozzle base 3-3-1, nozzle cap 3-3-2, nozzle adapter 3-3-3, and atomizing nozzle 3-3-4. Nozzle base 3-3-1 is connected to water supply ring 3-1. The bottom of nozzle base 3-3-1 has an opening through which water from water supply ring 3-1 is supplied to nozzle adapter 3-3-3 and atomizing nozzle 3-3-4. Nozzle cap 3-3-2 fixes nozzle adapter 3-3-3 onto nozzle base 3-3-1. The nozzle adapter 3-3-3 slides along the nozzle base 3-3-1 to adjust the angle between the center line of the nozzle 3-3 and the axis of the exhaust diffuser, thereby adjusting the spray angle. The atomizing nozzle 3-3-4 is fixed on the nozzle adapter 3-3-3. The nozzle orifice on the atomizing nozzle 3-3-4 is a non-circular structure. The atomizing nozzle 3-3-4 rotates along the center line of the nozzle adapter 3-3-3 to adjust the spray range of the atomizing nozzle 3-3-4 along the axis of the exhaust diffuser.

[0048] In specific implementation, refer to Figure 11The nozzle adapter 3-3-3 can slide along the nozzle base 3-3-1 to adjust the angle between the nozzle 3-3 and the exhaust axis, thereby adjusting the spray angle. The atomizing nozzle 3-3-4 is fixed on the nozzle adapter 3-3-3 and can rotate along the nozzle adapter 3-3-3 to adjust the spray range of the nozzle 3-3 along the exhaust axis, thereby adjusting the spray range. By adjusting the spray angle and spray range, water mist of different shapes can be sprayed to cool the high-temperature exhaust gas of the irregular nozzle, resulting in good cooling effect and low energy consumption.

[0049] In one embodiment, the nozzle orifice shape on the atomizing nozzle 3-3-4 is set to an ellipse with pointed ends.

[0050] In one embodiment, the nozzle adapter 3-3-3 includes a root and a rod. The root is located between the nozzle base 3-3-1 and the nozzle cap 3-3-2. The nozzle cap 3-3-2 is provided with a strip hole. The rod extends out of the strip hole and connects to the atomizing nozzle 3-3-4. The root slides on the spherical surface of the nozzle base 3-3-1, causing the rod to swing within the strip hole, thereby adjusting the spray angle.

[0051] In one embodiment, refer to Figure 12 The central axis of nozzle 3-3 is not perpendicular to the plane of water supply ring 3-1, and the central axis of nozzle 3-3 is inclined toward the center of water supply ring 3-1.

[0052] The water spray cooling assembly 3 reduces the exhaust temperature and the exhaust diffuser wall temperature through evaporative heat exchange, preventing high-temperature combustion gas from flowing back to the outside of the exhaust diffuser and the test chamber, and preventing the exhaust diffuser from being directly ablated by the high-temperature combustion gas jet. The nozzles 3-3 in the water spray cooling assembly 3 can spray water mist of different shapes by adjusting the spray angle and spray range, effectively cooling the high-temperature exhaust gas from irregularly shaped nozzles with good cooling effect and low energy consumption. The spray angle of the nozzles 3-3 in the water spray cooling assembly 3 is adjustable, allowing for adaptation to nozzle tests with different deflection jet patterns.

[0053] In one embodiment, refer to Figure 13 The replaceable inner retaining ring 4 includes a mounting plate 4-4. The replaceable inner retaining ring 4 is installed inside the backflow suppression retaining ring 1 via the mounting plate 4-4. The second cooling water assembly is located inside the mounting plate 4-4. The second cooling water assembly includes a water supply port 4-1, a water outlet 4-2, and a cooling ring 4-3. The cooling ring 4-3 is arranged in a ring shape along the circumference of the mounting plate 4-4. One end of the cooling ring 4-3 is connected to the water supply port 4-1, and the other end of the cooling ring 4-3 is connected to the water outlet 4-2.

[0054] In practical implementation, the replaceable inner baffle ring 4 consists of a water supply port 4-1, a water outlet 4-2, a cooling ring 4-3, and a mounting plate 4-4. The replaceable inner baffle ring 4 is installed inside the backflow suppression baffle ring 1 via the mounting plate 4-4. Cooling water flows through the water supply port 4-1 along the cooling ring 4-3 to the water outlet 4-2, cooling the replaceable inner baffle ring 4. The inner diameter of the backflow suppression baffle ring 1 can be adjusted using the replaceable inner baffle ring 4, accommodating nozzle test pieces of different sizes and jet patterns.

[0055] In this embodiment, the backflow suppression baffle 1 and the replaceable inner baffle 4 constitute a multi-stage cooling baffle, which can block part of the asymmetric jet backflow air, preventing a large amount of high-temperature backflow airflow from flowing back into the test chamber. At the same time, by installing the multi-stage cooling baffle, the inner diameter of the backflow suppression baffle 1 can be adjusted to adapt to nozzle jets of different sizes and flow rates, thus exhibiting high adaptability.

[0056] The embodiments provided by this invention, by upgrading existing nozzle or engine whole-machine testing devices, can effectively suppress the backflow of high-temperature exhaust gas during asymmetric jet nozzle testing in traditional testing devices, and can meet the testing requirements of asymmetric jet nozzles or engine whole-machine testing in confined spaces. The device of this invention can adjust the inner diameter, length, and distance from the nozzle of the exhaust diffuser, and can adapt to asymmetric jet nozzle tests of different sizes, lengths, flow rates, and deflection jet methods, showing strong adaptability. The replaceable ejector tube 2 of this invention can adapt to different sizes, lengths, flow rates, and deflection jet methods, efficiently guiding the nozzle airflow, avoiding the backflow of high-temperature exhaust gas, and reducing the temperature of the test chamber. The device of this invention is equipped with monitoring sensors that can adaptively adjust the cooling water flow rate, reducing test energy consumption. The device of this invention can cool the high-temperature exhaust gas in the nozzle, reducing the exhaust temperature of the exhaust diffuser and extending the service life of the equipment. The spray angle and range of the water spray cooling component 3 of this invention can be adjusted, spraying water mist of different shapes to cool the high-temperature exhaust gas of irregularly shaped nozzles, with good cooling effect and low energy consumption.

[0057] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A device for cooling and suppressing backflow of high-temperature combustion gas in an asymmetric jet of an exhaust diffuser, characterized in that, The device includes a backflow suppression ring (1), a replaceable ejector tube (2), a water spray cooling assembly (3), and a replaceable inner ring (4). The backflow suppression ring (1) is installed at the inlet of the exhaust diffuser. A first cooling water assembly is provided on the outer side of the backflow suppression ring (1) to block the high-temperature combustion gas in the high-temperature backflow zone. The replaceable inner ring (4) is installed in the middle area inside the backflow suppression ring (1). A through hole is provided in the middle of the replaceable inner ring (4). A second cooling water assembly is provided on the replaceable inner ring (4) to cool the replaceable inner ring (4). The inner diameter of the backflow suppression ring (1) can be adjusted by replacing different replaceable inner baffle rings (4); the replaceable ejector tube (2) is installed on the outside of the backflow suppression ring (1) as a secondary exhaust diffuser. The replaceable ejector tube (2) corresponds to the position of the through hole. The length, shape and diameter of the replaceable ejector tube (2) can be adjusted; the water spray cooling component (3) is installed on the inside of the backflow suppression ring (1). The water spray cooling component (3) is located on the outer ring of the replaceable inner baffle ring (4). The water spray cooling component (3) sprays atomized cooling water. The spray angle and spray range of the atomized cooling water can be adjusted.

2. The device for cooling and suppressing backflow of high-temperature gas in an asymmetric jet of an exhaust diffuser according to claim 1, characterized in that, The backflow suppression baffle (1) includes a baffle (1-1), which is formed by splicing two half-rings. The first cooling water assembly includes an inner ring water supply interface (1-4), an outer ring water outlet interface (1-5), and inner and outer ring cooling water baffles (1-7). The inner and outer ring cooling water baffles (1-7) are respectively set on the two half-rings. Each half-ring is divided into an inner ring and an outer ring by the inner and outer ring cooling water baffles (1-7). One end of the inner and outer ring cooling water baffles (1-7) is flush with the edge of the first end of the half-ring. The other end of the inner and outer ring cooling water baffles (1-7) leaves a gap with the edge of the second end of the half-ring. The first ends of the two half-rings are spliced ​​together, and the second ends of the two half-rings are spliced ​​together. The inner ring water supply interface (1-4) is located in the inner ring of the first end of each half-ring, and the outer ring water outlet interface (1-5) is located in the outer ring of the first end of each half-ring.

3. The device for cooling and suppressing backflow of high-temperature gas in an asymmetric jet of an exhaust diffuser according to claim 2, characterized in that, The first cooling water assembly also includes a built-in temperature sensor (1-2) and an adaptive regulating valve (1-3). Each inner ring water supply port (1-4) is connected to the adaptive regulating valve (1-3). The built-in temperature sensor (1-2) is located on the inner ring of each half ring and is communicatively connected to the adaptive regulating valve (1-3).

4. The device for cooling and suppressing backflow of high-temperature gas in an asymmetric jet of an exhaust diffuser according to claim 2, characterized in that, Each half ring has a water supply interface (1-6) on its inner ring. The water supply interface (1-6) is connected to the water cooling component (3) to supply the cold water outside the baffle (1-1) to the water cooling component (3).

5. The device for cooling and suppressing backflow of high-temperature combustion gas in an asymmetric jet of an exhaust diffuser according to claim 4, characterized in that, The water spray cooling component (3) includes a water supply ring (3-1), a water supply ring interface (3-2), a nozzle (3-3), and a mounting base (3-4). The water supply ring (3-1) is a ring structure. The mounting base (3-4) is connected to the side of the water supply ring (3-1) facing the center. The bottom of the mounting base (3-4) is connected to the backflow suppression ring (1). One end of the water supply ring interface (3-2) is connected to the water supply ring (3-1), and the other end of the water supply ring interface (3-2) is connected to the water supply interface (1-6) of the water spray pipe. The nozzle (3-3) is set on the water supply ring (3-1) and sprays atomized cooling water through the nozzle (3-3).

6. The device for cooling and suppressing backflow of high-temperature combustion gas in an asymmetric jet of an exhaust diffuser according to claim 5, characterized in that, The nozzle (3-3) includes a nozzle base (3-3-1), a nozzle cap (3-3-2), a nozzle adapter (3-3-3), and an atomizing nozzle (3-3-4). The nozzle base (3-3-1) is connected to the water supply ring (3-1). The bottom of the nozzle base (3-3-1) has an opening through which water from the water supply ring (3-1) is supplied to the nozzle adapter (3-3-3) and the atomizing nozzle (3-3-4). The nozzle cap (3-3-2) fixes the nozzle adapter (3-3-3) to the nozzle base (3-3-4). 1) The nozzle adapter (3-3-3) slides along the nozzle base (3-3-1) to adjust the angle between the center line of the nozzle (3-3) and the axis of the exhaust diffuser, thereby adjusting the spray angle; the atomizing nozzle (3-3-4) is fixed on the nozzle adapter (3-3-3), and the spray hole shape on the atomizing nozzle (3-3-4) is a non-circular structure. The atomizing nozzle (3-3-4) rotates along the center line of the nozzle adapter (3-3-3) to adjust the spray range of the atomizing nozzle (3-3-4) along the axis of the exhaust diffuser.

7. The device for cooling and suppressing backflow of high-temperature combustion gas in an asymmetric jet of an exhaust diffuser according to claim 6, characterized in that, The nozzle (3-3-4) has an elliptical shape with pointed ends.

8. The device for cooling and suppressing backflow of high-temperature gas in an asymmetric jet of an exhaust diffuser according to claim 6, characterized in that, The nozzle adapter (3-3-3) includes a root and a rod. The root is located between the nozzle base (3-3-1) and the nozzle cap (3-3-2). The nozzle cap (3-3-2) has a strip hole. The rod extends out of the strip hole and connects to the atomizing nozzle (3-3-4). The root slides on the spherical surface of the nozzle base (3-3-1) to make the rod swing in the strip hole, thereby adjusting the spray angle.

9. The device for cooling and suppressing backflow of high-temperature gas in an asymmetric jet of an exhaust diffuser according to claim 6, characterized in that, The central axis of the nozzle (3-3) is not perpendicular to the plane of the water supply ring (3-1), and the central axis of the nozzle (3-3) is inclined toward the center of the water supply ring (3-1).

10. The device for cooling and suppressing backflow of high-temperature combustion gas in an asymmetric jet of an exhaust diffuser according to claim 1, characterized in that, The replaceable inner retaining ring (4) includes a mounting plate (4-4). The replaceable inner retaining ring (4) is installed on the inner side of the backflow suppression retaining ring (1) through the mounting plate (4-4). The second cooling water assembly is located on the inner side of the mounting plate (4-4). The second cooling water assembly includes a water supply port (4-1), a water outlet (4-2), and a cooling ring (4-3). The cooling ring (4-3) is arranged in a ring shape along the circumferential direction of the mounting plate (4-4). One end of the cooling ring (4-3) is connected to the water supply port (4-1), and the other end of the cooling ring (4-3) is connected to the water outlet (4-2).

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