Air inlet temperature distortion generating device

Abstract

The invention provides an air inlet temperature distortion generating device, and belongs to the field of aero-engine tests. The outlet flow channel is connected with a downstream compression system; the mounting shell and the variable flow channel are arranged between the inlet flow channel and the outlet flow channel; the heater is arranged in the mounting shell and comprises a plurality of fan-shaped heating units which are distributed in the circumferential direction; the unit intervals are arranged between the adjacent fan-shaped heating units and are used for preventing heat series disturbance between the adjacent fan-shaped heating units; wherein each fan-shaped heating unit comprises an inner area heating module, a middle area heating module and an outer area heating module, the area heating modules are sequentially distributed in the radial direction, and the heating power of the inner area heating module, the middle area heating module and the outer area heating module of each fan-shaped heating unit is independently controlled by controlling the area of each fan-shaped heating unit; therefore, simulation of various air inlet distortion flow fields with different temperature gradients and circumferential, radial and combined steady-state temperatures is realized.

Description

Technical Field

[0001] The present application belongs to the field of aero-engine testing, and in particular relates to an intake air temperature distortion generating device. Background Art

[0002] Aircraft engine compression system intake distortion related tests include total pressure, temperature, swirl and other test items. In order to conduct intake distortion related tests, it is necessary to set up a corresponding distortion generating device at the compressor inlet to simulate the corresponding inlet distortion conditions. For example, when simulating total pressure distortion, a plug-in type total pressure distortion generating device that changes the inlet pressure is used, and when simulating temperature distortion, a temperature distortion generating device is used.

[0003] The current temperature distortion generating device is an electric heating temperature distortion generating device, which adopts a dot matrix heating unit layout to generate various types of temperature distortion. Its main disadvantages are as follows: 1) Lack of safety protection. The temperature distortion generating device is installed at the inlet of the compression system. High-speed rotating blades are installed in this area. The existing technical solution has no safety protection design. Foreign objects can easily damage the heating unit and the downstream compression system, causing equipment damage, resulting in economic losses and seriously affecting the test efficiency. 2) The thermal crosstalk phenomenon is significant. Although the existing technical solutions can achieve circumferential, radial and combined distortion, they cannot eliminate the thermal crosstalk phenomenon. The temperature difference in the heating interval causes strong heat exchange, which not only affects the control accuracy of the temperature distortion range, but also increases the heating time and power when the specified distortion intensity is reached, increases the power loss, and increases the test cost; 3) Disadvantages of equal-diameter design. The existing device adopts equal-diameter design. The gas flow rate is high under large flow conditions, which brings a large total pressure loss and has high strength requirements for the heating unit, increasing the design, manufacturing and maintenance costs. At the same time, it affects the gas heating effect, prolongs the system temperature stabilization time, reduces the implementation efficiency, and increases the test cost. Summary of the invention

[0004] The purpose of the present application is to provide an intake air temperature distortion generating device to solve or alleviate at least one problem in the background technology.

[0005] The technical solution of the present application is: an intake air temperature distortion generating device, comprising: Inlet flow channel; An outlet flow passage connected to a downstream compression system; A mounting housing and a variable-diameter flow channel disposed between the inlet flow channel and the outlet flow channel; A heater is arranged in the installation shell, and the heater includes a plurality of circumferentially distributed fan-shaped heating units; The unit intervals are arranged between adjacent fan-shaped heating units to prevent thermal crosstalk disturbance between adjacent fan-shaped heating units; Among them, the fan-shaped heating unit includes an inner zone heating module, a middle zone heating module and an outer zone heating module, and the inner zone heating module, the middle zone heating module and the outer zone heating module are distributed in sequence in the radial direction. By zoning control of each fan-shaped heating unit and individually controlling the heating power of the inner zone heating module, the middle zone heating module and the outer zone heating module of the fan-shaped heating unit, a variety of intake distortion flow field simulations with different temperature gradients and circumferential, radial and combined steady-state temperatures are realized.

[0006] Preferably, the installation interface form and size of the outlet flow channel are determined according to the air inlet interface form and size of the compression system.

[0007] Preferably, the exterior of the mounting housing is covered with a thermal insulation material to reduce heat dissipation.

[0008] Preferably, the diameter of the mounting shell is determined according to the air flow velocity through the heater and the maximum flow rate through the mounting shell, wherein the air flow velocity through the heater is ≤0.2Ma.

[0009] Preferably, the number of the fan-shaped heating units is determined according to a temperature distortion simulation target.

[0010] Preferably, the inner zone heating module, the middle zone heating module and the outer zone heating module are all fan-ring structures, and the sides of the inner zone heating module, the middle zone heating module and the outer zone heating module are flush.

[0011] Preferably, the inner zone heating module, the middle zone heating module and the outer zone heating module are all electrically heated heating modules.

[0012] Preferably, the unit interval is a hollow support plate structure, and the interior of the unit interval is filled with flame retardant and heat-insulating material.

[0013] Preferably, it also includes an inlet protection net and an outlet protection net. The inlet protection net is arranged and installed at the front end of the heater to prevent foreign objects from entering the air from damaging the heater. The outlet protection net is installed at the outlet position of the variable diameter flow channel close to the outlet flow channel to prevent foreign objects from entering the compression system and damaging the blades of the compression system.

[0014] Preferably, the mesh gap of the inlet protection net is larger than the mesh gap of the outlet protection net.

[0015] The intake air temperature distortion generating device provided by the present application has the following advantages: 1) The fan-shaped heating units arranged in an annular array and independently controlled in different zones are combined with the inner / middle / outer zone heating modules with independently controlled power to simulate various intake distortion flow fields such as circumferential, radial, and combined steady-state temperatures. 2) The use of unit spacing can effectively eliminate the thermal crosstalk between adjacent fan-shaped heating units, reduce the heat exchange between adjacent fan-shaped heating units, reduce heat loss, and improve the control accuracy of the temperature distortion range; 3) Based on the variable diameter flow channel design, the gas flow rate flowing through the heater is significantly reduced, the loss is reduced, and the heat exchange effect is improved; 4) The safety protection structure with two protective nets can effectively eliminate the risk of foreign objects damaging the test equipment and improve the safety protection capability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solution provided by the present application, the following is a brief introduction to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present application.

[0017] Figure 1 This is a schematic diagram of the structure of the intake air temperature distortion generating device of the present application.

[0018] Figure 2 This is a schematic diagram of the fan-shaped heating unit in this application.

[0019] Figure 3 This is a schematic diagram of the exit protection net in this application.

[0020] Figure 4 This is a schematic diagram of the imported protective net in this application.

[0021] Figure 5 Schematic diagram of various circumferential steady-state temperature distortions according to an embodiment of the present application.

[0022] Figure 6 Schematic diagram of various radial steady-state temperature distortions according to an embodiment of the present application.

[0023] Figure 7 Schematic diagram of steady-state temperature distortion of various combinations according to an embodiment of the present application. DETAILED DESCRIPTION

[0024] 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.

[0025] The present application provides an intake air temperature distortion generating device, which realizes circumferential, radial, and combined steady-state temperature distortion by adopting heating units arranged in a ring array, and can ensure precise control and adjustment of the temperature distortion range and intensity.

[0026] like Figure 1 and Figure 2As shown, the intake air temperature distortion generating device 10 provided by the present application is installed upstream of the compression system 20, and includes an inlet flow channel 1, an outlet flow channel 2, a mounting shell 3, a variable diameter flow channel 4, a heater 5 and a unit interval 6. The front end of the mounting shell 3 is connected to the inlet flow channel 1, and the rear end is connected to the variable diameter flow channel 4, and the rear end of the variable diameter flow channel 4 is connected to the outlet flow channel 2. The heater 5 is arranged in the mounting shell 3 and is separated by the unit interval 6.

[0027] The outlet flow channel 2 is used to form an installation interface for connecting to the downstream compression system 20, and the form and size of the installation interface are determined by the form and size of the air inlet interface of the compression system 20. The compression system 20 can be a fan, or a low-pressure compressor or a high-pressure compressor.

[0028] The mounting shell 3 is used for supporting, positioning and heat preservation of the heater 5, and its exterior is covered with heat-insulating materials to reduce heat dissipation. Exemplarily, the heat-insulating materials can be glass wool for heat insulation and sound absorption, rock wool for high temperature resistance and fire resistance, or polyurethane foam with low thermal conductivity and excellent heat-insulating performance, etc. The heat-insulating materials can be selected according to the requirements. In the present application, the mounting shell 3 is a structure of equal straight sections, and its diameter size is determined according to the air flow velocity flowing through the heater 5 and the maximum flow rate flowing through the mounting shell 3, wherein the air flow velocity flowing through the heater 5 is ≤0.2Ma.

[0029] The variable diameter flow channel 4 connects the outlet flow channel 2 and the mounting shell 3, and is used to reduce the total pressure loss between the inlet flow channel 1 and the outlet flow channel 2. Among them, the outside of the variable diameter flow channel 4 is also covered with a thermal insulation material, which is used to reduce the heat dissipation of the gas from the heater 5 to the inlet of the compression system 20, and improve the temperature simulation accuracy of the intake air temperature distortion generating device 10. The selection of thermal insulation materials can refer to the mounting shell 3 and will not be repeated. The inlet and outlet dimensions of the variable diameter flow channel 4 are respectively determined by the outlet flow channel 2 and the mounting shell 3. The axial length and appearance of the variable diameter flow channel 4 can be determined in combination with numerical simulation or CFD simulation, with the minimum total inlet and outlet pressure loss of the variable diameter flow channel 4 as a constraint.

[0030] In the present application, based on the variable diameter design, the diameter of the heater 5 is larger than the outlet diameter of the intake air temperature distortion generating device 10, which can significantly reduce the gas flow rate flowing through the heater 5, reduce losses, and improve the heat exchange effect. The profile of the variable diameter flow channel 4 is optimized in combination with aerodynamic simulation, and the surface of the heater 5 is streamlined. The total pressure loss of the intake air temperature distortion generating device 10 can be significantly reduced to achieve a low-loss design.

[0031] The heater 5 includes a plurality of fan-shaped heating units distributed in a circumferential ring shape. The number of fan-shaped heating units is determined by the temperature distortion simulation target. Figure 2In the illustrated embodiment, the heater 5 is composed of six fan-shaped heating units distributed in a circumferential annular shape. It can be understood that the heater 5 can be composed of eight or more fan-shaped heating units distributed in a circumferential annular shape.

[0032] Each fan-shaped heating unit includes an inner zone heating module 51, a middle zone heating module 52 and an outer zone heating module 53, which are distributed in sequence in the radial direction, wherein the inner zone heating module 51, the middle zone heating module 52 and the outer zone heating module 53 are all fan-ring structures, and the sides of the inner zone heating module 51, the middle zone heating module 52 and the outer zone heating module 53 are roughly flush, thereby forming a neat fan-shaped edge of the fan-shaped heating unit. Each fan-shaped heating unit adopts zone control, and the heating modules in each zone of the fan-shaped heating unit can also control the heating power separately, so as to realize a variety of intake distortion flow field simulations with different temperature gradients and circumferential, radial and combined steady-state temperatures.

[0033] Furthermore, the inner zone heating module 51, the middle zone heating module 52 and the outer zone heating module 53 in the present application are all electrically heated heating modules. Exemplarily, the electrically heated heating module may be a resistance wire heating element, such as a resistance wire of a nickel-chromium alloy, so as to achieve high temperature resistance and oxidation resistance of high temperature heating; the electrically heated heating module may also adopt a heating tube heating element, such as a heating tube filled with insulating material in a metal tube, to achieve efficient heating of the intake gas.

[0034] The unit interval 6 is arranged between adjacent fan-shaped heating units to prevent thermal crosstalk between adjacent fan-shaped heating units. In some embodiments of the present application, the unit interval 6 is a hollow support plate structure, which is filled with flame-retardant thermal insulation material to eliminate thermal crosstalk, reduce heat exchange between adjacent fan-shaped heating units, and improve the control accuracy of the temperature distortion range. Exemplarily, the flame-retardant thermal insulation material can be an inorganic flame-retardant thermal insulation material, such as rock wool, so as to achieve high temperature resistance and good heat insulation and sound absorption performance; the flame-retardant thermal insulation material can also be an organic flame-retardant thermal insulation material, such as flame-retardant polystyrene, so as to achieve good thermal insulation performance; the flame-retardant thermal insulation material can also be other types of flame-retardant thermal insulation materials, such as ceramic fibers, to achieve a lightweight and soft layout under high temperature resistance.

[0035] In a preferred embodiment of the present application, the intake air temperature distortion generating device 10 also includes an inlet protection net 7, which is arranged and installed at the front end of the heater 5 close to the inlet flow channel 1 to prevent foreign objects in the intake air from damaging the heater 5, and its diameter size is the same as the installation shell 3.

[0036] In a preferred embodiment of the present application, the intake air temperature distortion generating device 10 also includes an outlet protection net 8, which is installed at the outlet position of the variable diameter flow channel 4 close to the outlet flow channel 2, and is used to prevent foreign matter from entering the compression system 20 and damaging the blades of the compression system 20. Its diameter size is the same as that of the outlet flow channel 2.

[0037] like Figure 3 and Figure 4 As shown, in the present application, the mesh density of the inlet protection net 7 and the outlet protection net 8 should not be too large or too small, and the mesh density of the inlet protection net 7 and the outlet protection net 8 is configured to meet the requirements of the compression system 20 for the total pressure loss and the requirements of the compression system 20 for the turbulence. In some embodiments of the present application, the inlet protection net 7 and the outlet protection net 8 can be made of stainless steel to achieve good corrosion resistance on the basis of meeting the structural strength, such as 316 or 316L stainless steel; the inlet protection net 7 and the outlet protection net 8 can also be made of high-strength alloy steel to achieve good toughness on the basis of meeting the structural strength, such as HSLA alloy steel. Preferably, in the present application, the mesh gap of the inlet protection net 7 is larger than the mesh gap of the outlet protection net 8, so that it can play a role in protecting foreign matter and gradually screening, thereby improving the safety protection capability.

[0038] The intake air temperature distortion generating device of the present application adopts a fan-shaped heating unit distributed in a ring array. The fan-shaped heating unit has a plurality of independently controlled multi-zone heating modules with modular sampling. Each heating module can adjust the power individually, thereby simulating circumferential, radial, and combined steady-state temperature distortion.

[0039] like Figure 5 The figure shows a schematic diagram of various circumferential steady-state temperature distortions provided in this embodiment of the present application. By controlling the fan-shaped heating unit in one or more partitions, the circumferential steady-state temperature distortion simulation is realized. For example, a fan-shaped heating unit can be controlled to heat, and temperature distortion can be realized within a 60° range of the fan-shaped heating unit; or, two fan-shaped heating units with opposite centers are controlled to heat, and temperature distortion can be realized within a 60° range of the two opposite fans.

[0040] like Figure 6 The figure shows a schematic diagram of various radial steady-state temperature distortions provided in this embodiment of the present application. By controlling the heating modules of each zone in all the fan-shaped heating units simultaneously, radial steady-state temperature distortion simulation is realized. For example, the inner zone heating modules 51 of the six fan-shaped heating units are controlled simultaneously to heat them, thereby generating temperature distortion in the inner ring; or, the inner zone heating modules 51 and the middle zone heating modules 52 of the six fan-shaped heating units are controlled simultaneously to heat them, thereby generating temperature distortion in the inner ring and the middle ring.

[0041] like Figure 7 The figure shows a schematic diagram of various combined steady-state temperature distortions provided in this embodiment of the present application. By combining and controlling the fan-shaped heating units and the heating modules in each zone, the combined steady-state temperature distortion simulation is realized. For example, the outer zone heating module 53 and the inner zone heating module 51 of the two fan-shaped heating units with opposite centers are controlled to heat, thereby generating temperature distortion in the outer ring and the inner ring within the 60° range of the relative fan-shaped.

[0042] The intake air temperature distortion generating device provided by the present application has the following advantages: 1) The fan-shaped heating units arranged in an annular array and independently controlled in different zones are combined with the inner / middle / outer zone heating modules with independently controlled power to simulate various intake distortion flow fields such as circumferential, radial, and combined steady-state temperatures. 2) The unit spacing of 6 can effectively eliminate the thermal crosstalk between adjacent fan-shaped heating units, reduce the heat exchange between adjacent fan-shaped heating units, reduce heat loss, and improve the control accuracy of the temperature distortion range; 3) Based on the design of the variable diameter flow channel 4, the gas flow rate flowing through the heater 5 is significantly reduced, the loss is reduced, and the heat exchange effect is improved; 4) The safety protection structure with two protective nets can effectively eliminate the risk of foreign objects damaging the test equipment and improve the safety protection capability.

[0043] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. An intake air temperature distortion generating device, characterized in that: include: Inlet flow channel (1); An outlet flow passage (2) connected to a downstream compression system (20); A mounting housing (3) and a variable diameter flow channel (4) arranged between the inlet flow channel (1) and the outlet flow channel (2); A heater (5) disposed in the mounting housing (3), the heater (5) comprising a plurality of circumferentially distributed fan-shaped heating units; A unit spacer (6) provided between adjacent fan-shaped heating units, for preventing thermal crosstalk between adjacent fan-shaped heating units; The fan-shaped heating unit comprises an inner zone heating module (51), a middle zone heating module (52) and an outer zone heating module (53), and the inner zone heating module (51), the middle zone heating module (52) and the outer zone heating module (53) are sequentially distributed in the radial direction. By controlling each fan-shaped heating unit by partition and individually controlling the heating power of the inner zone heating module (51), the middle zone heating module (52) and the outer zone heating module (53) of the fan-shaped heating unit, a variety of intake distortion flow field simulations with different temperature gradients and circumferential, radial and combined steady-state temperatures are achieved.

2. The intake air temperature distortion generating device according to claim 1, characterized in that: The installation interface form and size of the outlet flow channel (2) are determined according to the air inlet interface form and size of the compression system (20).

3. The intake air temperature distortion generating device according to claim 1, characterized in that: The outside of the installation shell (3) is covered with a heat-insulating material to reduce heat dissipation.

4. The intake air temperature distortion generating device according to claim 3, characterized in that: The diameter size of the installation shell (3) is determined according to the air flow velocity flowing through the heater (5) and the maximum flow rate flowing through the installation shell (3), wherein the air flow velocity flowing through the heater (5) is ≤0.2 Ma.

5. The intake air temperature distortion generating device according to claim 1, characterized in that: The number of the fan-shaped heating units is determined according to a temperature distortion simulation target.

6. The intake air temperature distortion generating device according to claim 5, characterized in that: The inner zone heating module (51), the middle zone heating module (52), and the outer zone heating module (53) are all fan-ring structures, and the sides of the inner zone heating module (51), the middle zone heating module (52), and the outer zone heating module (53) are flush.

7. The intake air temperature distortion generating device according to claim 5 or 6, characterized in that: The inner zone heating module (51), the middle zone heating module (52) and the outer zone heating module (53) are all electrically heated heating modules.

8. The intake air temperature distortion generating device according to claim 1, characterized in that: The unit spacer (6) is a hollow support plate structure, and the interior of the unit spacer (6) is filled with flame retardant heat-insulating material.

9. The intake air temperature distortion generating device according to claim 1, characterized in that: It also includes an inlet protection net (7) and an outlet protection net (8), wherein the inlet protection net (7) is arranged and installed at the front end of the heater (5) to prevent foreign matter in the intake air from damaging the heater (5), and the outlet protection net (8) is installed at the outlet position of the variable diameter flow channel (4) close to the outlet flow channel (2) to prevent foreign matter from entering the compression system (20) and damaging the blades of the compression system (20).

10. The intake air temperature distortion generating device according to claim 9, characterized in that: The mesh gap of the inlet protection net (7) is larger than the mesh gap of the outlet protection net (8).

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