A jet precooling test platform integrated with a full-scale air inlet

Abstract

The present application belongs to the field of jet pre-cooling test technology, and in particular relates to a jet pre-cooling test platform that is integrated with a full-size air intake duct. It includes: a heating and pressure stabilization system, an air intake adapter section, a front test section, a full-size air intake duct, a rear test section, and an exhaust section. The front end of the air intake adapter section is connected to the outlet of the heating and pressure stabilization system; the front end of the front test section is connected to the rear end of the air intake adapter section; the front end of the full-size air intake duct is connected to the rear end of the front test section, and a spray rod is installed inside the full-size air intake duct, and the water inlet pipe of the spray rod is connected to the water system through a water medium distributor; the front end of the rear test section is connected to the rear end of the full-size air intake duct; the front end of the exhaust section is connected to the rear end of the rear test section, and an electric regulating butterfly valve is installed on the exhaust section. The present application has the ability to carry out component-level and whole-machine-level jet pre-cooling tests, and can realistically simulate the air intake environment of the engine.

Description

Technical Field

[0001] The present application belongs to the field of jet pre-cooling test technology, and in particular relates to a jet pre-cooling test platform designed as an integrated whole with a full-size air inlet. Background Art

[0002] The turboramjet combined power developed on the basis of mature turbines has the advantages of low technical difficulty, short development cycle, and rapid equipment formation, which can fill the gap in the field of high-speed power equipment of our army. However, the most prominent problem of the turboramjet combined power is that the maximum operating speed of conventional turbine engines is only about Ma2.5, which cannot reach the lower speed limit of Ma3.0 for the stable operation of ramjet engines. There is a "speed gap" problem between the two. The use of jet precooling technology can effectively solve this problem. The principle of jet precooling technology is to spray a low-boiling-point discrete water medium or a mixture of water and methanol into the high-temperature incoming flow, and use the huge latent heat of vaporization of the water medium to significantly reduce the incoming flow temperature, expand the engine flight envelope, and make it not limited by flight altitude and Mach number.

[0003] At present, a lot of research work has been carried out on jet precooling technology at home and abroad. Foreign institutions are concerned about the impact of jet precooling on the thrust of the whole machine; developed countries such as Europe and the United States have conducted a large number of jet precooling test studies on various types of engines, while domestic research institutions mainly study jet precooling technology through numerical simulation. The data obtained through numerical simulation often have low confidence because they have not been effectively verified by experiments. Therefore, there is an urgent need for a ground jet precooling test platform with an integrated design of a full-size air inlet to carry out relevant jet precooling test verification work.

[0004] The following problems still exist in the existing technology: there is no test platform that can carry out jet pre-cooling ground tests based on a real full-size intake duct; due to the influence of the complex intake system structure, the intake flow field is uneven, resulting in a large total intake pressure loss, and the temperature field distribution after pre-cooling is uneven; due to the high intake air temperature, the intake pipe expands due to heat, and a spherical ring and a sealing ring structure are generally used to absorb thermal expansion and seal the pipe, but the structure is complex and is prone to poor sealing under high-pressure intake conditions, causing leakage; the jet pre-cooling intake system has no pressure regulating device and cannot truly simulate the engine's intake environment; it is impossible to effectively measure the physical parameters of the intake and flow field after jet pre-cooling.

[0005] Therefore, it is desired to have a technical solution to overcome or at least alleviate at least one of the above-mentioned deficiencies of the prior art. Summary of the Invention

[0006] The purpose of this application is to provide a jet pre-cooling test platform that is integrated with a full-size air inlet to solve at least one problem existing in the prior art.

[0007] The technical solution of this application is:

[0008] A jet pre-cooling test platform integrated with a full-scale air inlet, including:

[0009] Heating and voltage stabilizing system;

[0010] An air intake adapter section, the front end of which is connected to the outlet of the heating and pressure stabilization system;

[0011] a front test section, the front end of which is connected to the rear end of the air intake adapter section;

[0012] A full-size air inlet duct, the front end of the full-size air inlet duct is connected to the rear end of the front test section, a spray boom is installed inside the full-size air inlet duct, and the water inlet pipe of the spray boom is connected to the water system through a water medium distributor;

[0013] a rear test section, wherein a front end of the rear test section is connected to a rear end of the full-size air inlet;

[0014] The exhaust section has a front end connected to the rear end of the post-test section, and an electric regulating butterfly valve is installed on the exhaust section.

[0015] In at least one embodiment of the present application, the air intake transition section includes a transition section housing and a rectifying plate installed inside the transition section housing, wherein:

[0016] The transition section housing includes an integrally formed front section housing and a rear section housing;

[0017] The front section of the front shell is circular in cross section, and the rear section is square in cross section. The front shell is coaxial with the heating and voltage stabilizing system.

[0018] The front end section of the rear section shell is square, and the rear end section is rectangular. The rear section shell is coaxial with the inlet section of the full-size air inlet duct.

[0019] Six rectifier plates are evenly arranged along the longitudinal direction inside the transition section shell.

[0020] In at least one embodiment of the present application, the six rectifying plates are connected by three reinforcing ribs uniformly arranged along the transverse direction.

[0021] In at least one embodiment of the present application, the front test section is provided with a first total temperature and total pressure transmitter, and the rear test section is provided with a second total temperature and total pressure transmitter.

[0022] In at least one embodiment of the present application, a plurality of spray bars are evenly arranged laterally along the inlet cross section of the full-size air inlet duct.

[0023] In at least one embodiment of the present application, the water medium distributor is fixedly mounted on the full-size air inlet duct and is connected to the spray bar and the water system respectively through rubber hoses.

[0024] In at least one embodiment of the present application, a support frame is further included, and the support frame includes a front support frame and a rear support frame, wherein:

[0025] The heating and pressure stabilizing system is installed on the front support frame through a first fixed support seat;

[0026] The full-size air intake is mounted on the rear support frame via a second fixed support seat;

[0027] The exhaust section is mounted on the rear support frame via a third fixed support seat and a sliding support seat.

[0028] In at least one embodiment of the present application, pins are symmetrically arranged on the outer wall of the full-size air inlet duct, and the pins are inserted into the ear connecting part, and the ear connecting part is fixedly connected to the second fixed support seat.

[0029] In at least one embodiment of the present application,

[0030] The rear end of the air intake adapter section is provided with an adapter section rear flange, the root of the adapter section rear flange is provided with a mounting groove, and a rubber graphite packing is installed in the mounting groove;

[0031] The front end of the front test section is provided with a front plug-in section and a front test section front flange. The front plug-in section is plugged into the rear end of the air intake adapter section. The front test section front flange is connected to the adapter section rear flange by bolts.

[0032] In at least one embodiment of the present application,

[0033] The front end of the exhaust section is provided with an exhaust section front flange, the root of the exhaust section front flange is provided with a mounting groove, and a rubber graphite packing is installed in the mounting groove;

[0034] The rear end of the rear test section is provided with a rear plug-in section and a rear test section rear flange. The rear plug-in section is plugged into the front end of the exhaust section. The rear test section rear flange is connected to the exhaust section front flange by bolts.

[0035] The invention has at least the following beneficial technical effects:

[0036] The jet pre-cooling test platform designed with full-scale air inlet as an integral part of this application is

[0037] a) Have the ability to carry out component-level and complete machine-level jet precooling tests;

[0038] b) It can truly simulate the engine's intake environment, and the test results are accurate and true;

[0039] c) Ability to ensure uniform inlet airflow field during jet precooling test;

[0040] d) It can effectively absorb the thermal expansion of the air intake duct and achieve effective sealing of the duct;

[0041] e) It can accurately evaluate the physical parameters of the flow field before and after jet precooling, providing an important reference for performance calculation and evaluation. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 This is a top view of a jet pre-cooling test platform integrated with a full-scale air inlet according to one embodiment of the present application;

[0043] Figure 2 This is a front view of a jet pre-cooling test platform integrated with a full-scale air inlet according to one embodiment of the present application;

[0044] Figure 3 This is a front view of the air intake adapter section of one embodiment of the present application;

[0045] Figure 4 This is a left view of the air intake adapter section of one embodiment of the present application;

[0046] Figure 5 This is a schematic diagram of the support structure of a jet pre-cooling test platform integrated with a full-scale air inlet according to one embodiment of the present application;

[0047] Figure 6 yes Figure 5 Enlarged view at point I in the middle;

[0048] Figure 7 yes Figure 5 Enlarged view of point II in the middle.

[0049] in:

[0050] 1-Water system; 2-Heating and pressure stabilizing system; 3-Air intake adapter section; 4-Water medium distributor; 5-Full-size air intake duct; 6-Electric regulating butterfly valve; 7-Front test section; 8-Spray rod; 9-Rear test section; 10-Support frame; 11-Adapter section shell; 12-Rectifier plate; 13-Reinforcement ribs; 14-First fixed support seat; 15-Second fixed support seat; 16-Third fixed support seat; 17-Sliding support seat; 18-Rubber graphite packing. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solutions and advantages of the implementation of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below in conjunction with the drawings in the embodiments of this application. In the drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The described embodiments are part of the embodiments of this application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain this application, and should not be understood as limitations on this application. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The embodiments of this application are described in detail below in conjunction with the drawings.

[0052] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as limiting the scope of protection of this application.

[0053] The following is combined with Figures 1 to 7 This application is described in further detail.

[0054] The present application provides a jet pre-cooling test platform designed in an integrated manner with a full-size air inlet duct, including: a heating and pressure stabilization system 2, an air inlet adapter section 3, a front test section 7, a full-size air inlet duct 5, a rear test section 9 and an exhaust section.

[0055] Specifically, such as Figure 1 As shown, the heating and pressure stabilizing system 2 is used to heat and stabilize the test airflow; the front end of the air intake adapter section 3 is connected to the outlet of the heating and pressure stabilizing system 2 through a circular flange, the front end of the air intake adapter section 3 is adapted to the circular cross-section of the heating and pressure stabilizing system 2, and the rear end of the air intake adapter section 3 is adapted to the rectangular cross-section of the full-size air intake duct 5; the front end of the front test section 7 is connected to the rear end of the air intake adapter section 3; the full-size air intake duct 5 is a real air intake duct of a certain type of aircraft, and its front end is connected to the rear end of the front test section 7. A spray rod 8 is installed inside the full-size air intake duct 5, and the water inlet pipe of the spray rod 8 is connected to the water system 1 through the water medium distributor 4; the front end of the rear test section 9 is connected to the rear end of the full-size air intake duct 5; the front end of the exhaust section is connected to the rear end of the rear test section 9, and the exhaust section is equipped with an electric regulating butterfly valve 6. Under the condition of a certain air supply flow rate, the total pressure of the flow field is adjusted by adjusting the opening of the electric regulating butterfly valve 6 to simulate the Mach number of the aircraft in different flight states. All assemblies are connected by flanges.

[0056] The jet pre-cooling test platform designed to be integrated with the full-scale air inlet in this application works as follows:

[0057] The high-speed airflow is heated, slowed, and stabilized by the heating and pressure-stabilizing system 2. After being guided and rectified by the intake adapter section 3, it flows perpendicularly through the jet cross-section of the full-size intake duct 5. A spray bar 8 injects a water medium with a specified pressure, flow rate, temperature, and cleanliness into the high-speed airflow. The water medium is sheared and broken into small droplets by the high-speed airflow. These droplets then transfer heat and mass with the surrounding high-temperature gas. The water medium's enormous latent heat of vaporization cools the surrounding high-temperature gas, achieving jet pre-cooling. The cooled gas is then discharged through the electrically controlled butterfly valve 6. The front and rear measurement sections 7 and 9 monitor the total intake temperature of the high-temperature gas and the total gas temperature after jet pre-cooling in real time. The temperature difference between the two is used to calculate the cooling capacity and evaporation efficiency of the jet pre-cooling device. The water supply flow of the water system 1 is then adjusted online to ensure that the total gas temperature after jet pre-cooling meets the engine's intake requirements.

[0058] The jet pre-cooling test platform integrated with the full-scale air intake in this application features a circular outlet for the heating and pressure stabilization system 2 and a rectangular inlet for the full-scale air intake 5. This creates a significant radial height difference between the two. This requires an air intake adapter 3 to achieve a transition between these different cross-sectional shapes and height differences. In a preferred embodiment of the present application, the air intake transition section 3 is structurally a combined welded part, including a transition section shell 11 and a rectifier plate 12 installed inside the transition section shell 11, wherein the transition section shell 11 includes an integrally formed front section shell and a rear section shell; the front section shell has a circular front end cross-section, a square rear end cross-section, and a smooth transition in the middle. The front section shell is coaxial with the heating and pressure stabilization system 2, and the circular structure is converted into a coaxial square structure through the front half of the transition section shell 11, and the lateral side length of the square structure is consistent with the length of the air intake duct inlet; the front section shell has a square front end cross-section, a rectangular rear end cross-section, and a smooth transition in the middle. The rear section shell is coaxial with the inlet section of the full-size air intake duct 5, and the rear half of the transition section shell 11 transitions again to convert the square structure into a rectangular structure of the air intake duct. Because the inlet and outlet configurations of the intake transition section 3 change dramatically, and the exhaust direction is at an angle to the intake direction, in this embodiment, six rectifier plates 12 are evenly spaced longitudinally within the transition section housing 11. These plates prevent vortices from forming at the turning points, which could cause significant pressure loss, while ensuring a uniform intake flow field. The plates 12 are relatively thin, and the high fluid velocity exerts a significant impact on them. Advantageously, in this embodiment, the six rectifier plates 12 are connected by three evenly spaced reinforcing ribs 13 along the transverse direction to ensure their strength.

[0059] The jet pre-cooling test platform of the present application is integrated with the full-size air inlet duct. The front test section 7 is provided with a first total temperature and total pressure transmitter, which can measure the mass flow rate and temperature of the high-temperature incoming flow; the rear test section 9 is provided with a second total temperature and total pressure transmitter, which can measure the total temperature, circumferential temperature unevenness and circumferential pressure unevenness of the two-phase flow field medium after jet pre-cooling.

[0060] The jet pre-cooling test platform of the present application is designed to be integrated with the full-size air intake duct. The spray rod 8 is designed to be integrated with the full-size air intake duct 5. Multiple spray rods 8 are evenly arranged laterally at the inlet cross-section of the full-size air intake duct 5 based on the penetration depth of a single spray rod 8 in high-speed airflow. The structure and arrangement of the spray rods 8 should reduce the impact on the airflow field and ensure the uniformity of the temperature field at the outlet cross-section of the test platform, i.e., the engine inlet cross-section. The two ends of the spray rod 8 are respectively connected and fixed to the top and bottom end faces of the full-size air intake duct 5. The water medium distributor 4 is fixedly mounted above the full-size air intake duct 5 by a bracket and is connected to the spray rod 8 and the water system 1 respectively by a rubber hose. The water medium distributor 4 can deliver water medium that meets the temperature, pressure, flow rate and cleanliness requirements to each spray rod 8.

[0061] The jet pre-cooling test platform with an integrated design of a full-size air inlet duct in the present application is installed and constructed based on the existing test bench. Each assembly is fixedly installed through a support frame 10. The support frame 10 includes a front support frame and a rear support frame. Among them, the heating and pressure stabilization system 2 is installed on the front support frame through a first fixed support seat 14; the full-size air inlet duct 5 is installed on the rear support frame through a second fixed support seat 15; the exhaust section is installed on the rear support frame through a third fixed support seat 16 and a sliding support seat 17.

[0062] Advantageously, in this embodiment, pins are symmetrically arranged on the outer wall of the full-size air intake duct 5. The pins are inserted into the tab connection portion, which is fixedly connected to the second fixed support base 15, which is fixedly mounted on the rear support frame. The cooperation between the pins and the tabs can limit the axial and radial displacement of the full-size air intake duct 5, but does not restrict the rotation of the full-size air intake duct 5 along the pin supports on both sides during thermal expansion.

[0063] Advantageously, in this embodiment, the rear end of the intake adapter section 3 is provided with an adapter section rear flange, the root of which is provided with a mounting groove, in which a rubber graphite packing 18 is installed; the front end of the front test section 7 is provided with a front plug-in section and a front test section front flange, the front plug-in section is plugged into the rear end of the intake adapter section 3, and the front test section front flange and the adapter section rear flange are connected by bolts. The front end of the exhaust section is provided with an exhaust section front flange, the root of which is provided with a mounting groove, in which a rubber graphite packing 18 is installed; the rear end of the rear test section 9 is provided with a rear plug-in section and a rear test section rear flange, the rear plug-in section is plugged into the front end of the exhaust section, and the rear test section rear flange and the exhaust section front flange are connected by bolts.

[0064] Among them, the first fixed support seat 14 and the third fixed support seat 16 are both conventional fixed installation structures. The first fixed support seat 14 is used to fix the heating and pressure stabilizing system 2 to the front support frame; the third fixed support seat 16 is used to fix the exhaust section to the rear support frame. The rear half of the exhaust section is installed on the rear support frame via the sliding support seat 17. The thermal expansion of the exhaust section is absorbed by the rear half supported by the sliding support seat 17. The thermal expansion between the first fixed support seat 14 and the second fixed support seat 15 is absorbed by the above-mentioned slip-on flange connecting the intake adapter section 3 and the front test section 7. The slip-on flange is tightened by circumferential bolts. During the tightening process, the rubber graphite packing 18 is squeezed to deform it, thereby achieving sealing of the intake pipe. Similarly, the thermal expansion absorption between the second fixed support seat 15 and the third fixed support seat 16 is similar.

[0065] The present application has built a jet pre-cooling test platform with an integrated design of a full-size air intake duct, which can carry out component-level and whole-machine-level jet pre-cooling test research; the air intake system adopts a real full-size air intake duct 5, and cooperates with the regulating valve on the exhaust section to simulate the real air intake environment of the engine; the uniformity of the air intake flow field of the jet pre-cooling test is ensured by the design of the air intake adapter section 3; the impact of thermal expansion on the safety of the test equipment is fully considered, and the absorption of the thermal expansion of the air intake pipe and the reliable sealing of the pipe are guaranteed by the design of the socket section structure; the front measurement section 7 and the rear measurement section 9 are designed, which can accurately evaluate the parameters such as the cooling amount of the jet pre-cooling device, evaporation efficiency, temperature distortion and pressure distortion of the engine compressor intake section based on the measurement of high-temperature intake total pressure, intake total temperature, intake flow rate and the distribution of the temperature field after jet pre-cooling.

[0066] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A jet pre-cooling test platform integrated with a full-scale air inlet, characterized by: include: Heating and pressure stabilizing system (2); An air intake adapter section (3), the front end of which is connected to the outlet of the heating and pressure stabilizing system (2); A front test section (7), the front end of the front test section (7) being connected to the rear end of the air intake adapter section (3); A full-size air inlet (5), wherein the front end of the full-size air inlet (5) is connected to the rear end of the front test section (7), a spray bar (8) is installed inside the full-size air inlet (5), and the water inlet pipe of the spray bar (8) is connected to the water system (1) through a water medium distributor (4); a rear test section (9), the front end of the rear test section (9) being connected to the rear end of the full-size air inlet duct (5); An exhaust section, the front end of which is connected to the rear end of the rear test section (9), and an electric regulating butterfly valve (6) is installed on the exhaust section; The air intake transition section (3) comprises a transition section housing (11) and a rectifying plate (12) installed inside the transition section housing (11), wherein: The transition section housing (11) comprises an integrally formed front section housing and a rear section housing; The front section of the front shell has a circular cross section and a square cross section at the rear end, and the front shell is coaxial with the heating and pressure stabilizing system (2); The front end section of the rear section shell is square, the rear end section is rectangular, and the rear section shell is coaxial with the inlet section of the full-size air inlet duct (5); Six rectifier plates (12) are evenly arranged longitudinally inside the transition section housing (11); The front test section (7) is provided with a first total temperature and total pressure transmitter, and the rear test section (9) is provided with a second total temperature and total pressure transmitter; A plurality of spray bars (8) are evenly arranged laterally along the inlet cross section of the full-size air inlet duct (5).

2. The jet pre-cooling test platform integrated with the full-scale air inlet according to claim 1 is characterized in that: The six rectifier plates (12) are connected by three reinforcing ribs (13) uniformly arranged in the transverse direction.

3. The jet pre-cooling test platform integrated with the full-scale air inlet according to claim 1 is characterized in that: The water medium distributor (4) is fixedly mounted on the full-size air inlet duct (5) and is connected to the spray bar (8) and the water system (1) respectively through a rubber hose.

4. The jet pre-cooling test platform integrated with the full-scale air inlet according to claim 1 is characterized in that: It also includes a support frame (10), the support frame (10) including a front support frame and a rear support frame, wherein: The heating and pressure stabilizing system (2) is mounted on the front support frame via a first fixed support seat (14); The full-size air inlet (5) is mounted on the rear support frame via a second fixed support seat (15); The exhaust section is mounted on the rear support frame via a third fixed support seat (16) and a sliding support seat (17).

5. The jet pre-cooling test platform integrated with the full-scale air inlet according to claim 4 is characterized in that: Pins are symmetrically arranged on the outer wall surface of the full-size air inlet (5), and the pins are inserted into the ear connecting portion, and the ear connecting portion is fixedly connected to the second fixed support seat (15).

6. The jet pre-cooling test platform integrated with the full-scale air inlet according to claim 5 is characterized in that: The rear end of the air intake adapter section (3) is provided with an adapter section rear flange, the root of the adapter section rear flange is provided with a mounting groove, and a rubber graphite packing (18) is installed in the mounting groove; The front end of the front test section (7) is provided with a front plug-in section and a front test section front flange, the front plug-in section is plugged into the rear end of the air intake adapter section (3), and the front test section front flange is connected to the adapter section rear flange via bolts.

7. The jet pre-cooling test platform integrated with the full-scale air inlet according to claim 6 is characterized in that: The front end of the exhaust section is provided with an exhaust section front flange, the root of the exhaust section front flange is provided with a mounting groove, and a rubber graphite packing (18) is installed in the mounting groove; The rear end of the rear test section (9) is provided with a rear plug-in section and a rear test section rear flange, the rear plug-in section is plugged into the front end of the exhaust section, and the rear test section rear flange is connected to the exhaust section front flange via bolts.

Images