An intake air temperature distortion generating device

Abstract

The present application provides an intake air temperature distortion generating device, belonging to the field of aero-engine tests. The device includes: an inlet flow passage; an outlet flow passage connected to a downstream compression system; an installation housing and a variable radial flow passage arranged between the inlet flow passage and the outlet flow passage; a heater arranged in the installation housing, the heater including a plurality of circumferentially distributed sector heating units; a unit interval arranged between adjacent sector heating units for preventing thermal crosstalk disturbance between adjacent sector heating units; wherein, each sector heating unit includes an inner zone heating module, a middle zone heating module and an outer zone heating module, and the heating modules of each zone are sequentially distributed in the radial direction. By controlling each sector heating unit in zones and controlling the heating power of the inner zone heating module, the middle zone heating module and the outer zone heating module of each sector heating unit separately, a variety of intake air distortion flow field simulations with different temperature gradients and circumferential, radial and combined steady-state temperatures can be realized.

Description

Technical Field

[0001] This application belongs to the field of aero-engine tests, and particularly relates to an inlet air temperature distortion generating device. Background Art

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

[0003] The current temperature distortion generating device is an electric heating type temperature distortion generating device, which adopts a dot matrix heating unit layout to generate various types of temperature distortions. Its main disadvantages are as follows:

[0004] 1) Lack of safety protection. The temperature distortion generating device is installed at the compressor system inlet, and there are high-speed rotating blades installed in this area. The existing technical solutions have no safety protection design, and foreign objects are likely to hit the heating unit and the downstream compression system, resulting in equipment damage, economic losses, and seriously affecting the test efficiency;

[0005] 2) The thermal crosstalk disturbance phenomenon is significant. Although the existing technical solutions can achieve circumferential, radial, and combined distortions, they cannot eliminate the thermal crosstalk disturbance phenomenon. The temperature difference in the heating area 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 reaching the specified distortion intensity, increases the power consumption, and increases the test cost;

[0006] 3) Disadvantages of equal diameter design. The existing device adopts an equal diameter design. At large flow conditions, the gas flow velocity is high, resulting in a large total pressure loss, and has high requirements for the strength of 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

[0007] The purpose of this application is to provide an inlet air temperature distortion generating device to solve or mitigate at least one problem in the background art.

[0008] The technical solution of this application is: an inlet air temperature distortion generating device, including:

[0009] An inlet flow channel;

[0010] An outlet flow channel connecting to the downstream compression system;

[0011] An installation housing and a variable radius flow channel arranged between the inlet flow channel and the outlet flow channel;

[0012] A heater disposed within an installation housing, the heater comprising a plurality of circumferentially distributed sector-shaped heating units;

[0013] A unit interval disposed between adjacent sector-shaped heating units for preventing thermal crosstalk disturbance between adjacent sector-shaped heating units;

[0014] Wherein, the sector-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 sequentially distributed in the radial direction. By controlling each sector-shaped heating unit in zones and separately controlling the heating power of the inner zone heating module, the middle zone heating module, and the outer zone heating module of the sector-shaped heating unit, a variety of intake air distortion flow field simulations with different temperature gradients and circumferential, radial, and combined steady-state temperatures can be achieved.

[0015] Preferably, the installation interface form and size of the outlet flow channel are determined according to the intake interface form and size of the compression system.

[0016] Preferably, the exterior of the installation housing is covered with a heat-insulating material to reduce heat dissipation.

[0017] Preferably, the diameter size of the installation housing is determined according to the air flow velocity through the heater and the maximum flow rate through the installation housing, wherein the air flow velocity through the heater ≤ 0.2Ma.

[0018] Preferably, the number of the sector-shaped heating units is determined according to the temperature distortion simulation target.

[0019] Preferably, the inner zone heating module, the middle zone heating module, and the outer zone heating module are all in the form of sector-shaped rings, and the sides of the inner zone heating module, the middle zone heating module, and the outer zone heating module are flush.

[0020] Preferably, the inner zone heating module, the middle zone heating module, and the outer zone heating module are all electrically heated heating modules.

[0021] Preferably, the unit interval is a hollow support plate-like structure, and the interior of the unit interval is filled with a flame-retardant heat-insulating material.

[0022] Preferably, an inlet protection net and an outlet protection net are further included. The inlet protection net is arranged and installed at the front end of the heater to prevent intake foreign objects from damaging the heater, and 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.

[0023] Preferably, the mesh gap of the inlet protection net is larger than the mesh gap of the outlet protection net.

[0024] The intake air temperature distortion generating device provided by the present application has the following advantages:

[0025] 1) The fan-shaped heating units arranged in a circular array and independently controlled in zones, combined with the inner / middle / outer zone heating modules with independently controllable power, can simulate various intake air distortion flow fields such as circumferential, radial, and combined steady-state temperatures;

[0026] 2) By adopting unit intervals, the thermal cross-disturbance phenomenon between adjacent fan-shaped heating units can be effectively eliminated, the heat exchange between adjacent fan-shaped heating units can be reduced, heat loss can be decreased, and the control accuracy of the temperature distortion range can be improved;

[0027] 3) Based on the variable flow channel design, the gas flow rate through the heater is significantly reduced, losses are decreased, and the heat exchange effect is improved;

[0028] 4) The safety protection structure with two protective nets can effectively eliminate the risk of foreign objects hitting the test equipment and improve the safety protection ability. Description of the Drawings

[0029] In order to more clearly illustrate the technical solutions provided in this application, the drawings will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application.

[0030] Figure 1 It is a schematic structural diagram of the intake air temperature distortion generating device of this application.

[0031] Figure 2 It is a schematic diagram of the fan-shaped heating unit in this application.

[0032] Figure 3 It is a schematic diagram of the outlet protective net in this application.

[0033] Figure 4 It is a schematic diagram of the inlet protective net in this application.

[0034] Figure 5 It is a schematic diagram of various circumferential steady-state temperature distortions of an embodiment of this application.

[0035] Figure 6 It is a schematic diagram of various radial steady-state temperature distortions of an embodiment of this application.

[0036] Figure 7 It is a schematic diagram of various combined steady-state temperature distortions of an embodiment of this application. Detailed Embodiments

[0037] 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 with reference to the drawings in the embodiments of this application.

[0038] The present application provides an intake air temperature distortion generating device. By adopting heating units arranged in an annular array, circumferential, radial, and combined steady-state temperature distortions can be achieved, and precise control and adjustment of the temperature distortion range and intensity can be ensured.

[0039] As Figure 1 and Figure 2 As shown, the intake air temperature distortion generating device 10 provided by the present application is installed upstream of the compression system 20. It includes an inlet flow channel 1, an outlet flow channel 2, a mounting housing 3, a variable-diameter flow channel 4, a heater 5, and a unit interval 6. The front end of the mounting housing 3 is connected to the inlet flow channel 1, and the rear end is connected to the variable-diameter flow channel 4. 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 housing 3 and is separated by the unit interval 6.

[0040] The outlet flow channel 2 is used to form a mounting interface connecting to the downstream compression system 20, and the form and size of its mounting interface are determined by the form and size of the intake interface of the compression system 20. The compression system 20 can be a fan, or a low-pressure compressor or a high-pressure compressor.

[0041] The mounting housing 3 is used for the support and positioning of the heater 5 and heat preservation. Its exterior is covered with heat preservation materials to reduce heat dissipation. Exemplarily, the heat preservation materials can be heat-insulating and sound-absorbing glass wool, high-temperature-resistant and fire-proof rock wool, or polyurethane foam with low thermal conductivity and excellent heat preservation performance, etc. The heat preservation materials can be selected according to requirements. In the present application, the mounting housing 3 has a straight-section structure, and its diameter size is determined according to the air flow velocity passing through the heater 5 and the maximum flow rate passing through the mounting housing 3, where the air flow velocity passing through the heater 5 ≤ 0.2Ma.

[0042] The variable-diameter flow channel 4 connects the outlet flow channel 2 and the mounting housing 3 to reduce the total pressure loss between the inlet flow channel 1 and the outlet flow channel 2. Among them, the exterior of the variable-diameter flow channel 4 is also covered with heat preservation materials 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 the heat preservation materials can refer to the mounting housing 3 and will not be elaborated here. The inlet and outlet dimensions of the variable-diameter flow channel 4 are determined by the outlet flow channel 2 and the mounting housing 3 respectively. The axial length and external shape of the variable-diameter flow channel 4 can be determined by combining numerical simulation or CFD simulation with the minimum total pressure loss at the inlet and outlet of the variable-diameter flow channel 4 as the constraint.

[0043] 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 velocity passing through the heater 5, reduce losses, and improve the heat exchange effect. By combining aerodynamic simulation to optimize the profile of the variable-diameter flow channel 4 and at the same time performing a streamline design on the surface of the heater 5, the total pressure loss of the intake air temperature distortion generating device 10 can be significantly reduced, realizing a low-loss design.

[0044] The heater 5 includes a plurality of sector heating units distributed in a circumferential ring shape. The number of sector heating units is determined by the temperature distortion simulation target. For example, in Figure 2 the illustrated embodiment, the heater 5 is composed of 6 sector heating units distributed in a circumferential ring shape. It can be understood that the heater 5 can be composed of 8 or more sector heating units distributed in a circumferential ring shape.

[0045] Each sector heating unit includes an inner zone heating module 51, a middle zone heating module 52, and an outer zone heating module 53. The inner zone heating module 51, the middle zone heating module 52, and the outer zone heating module 53 are distributed in sequence in the radial direction. Among them, the inner zone heating module 51, the middle zone heating module 52, and the outer zone heating module 53 are all fan-shaped 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, so as to form a neat fan-shaped edge of the sector heating unit. Each sector heating unit adopts zonal control, and the heating modules in each zone of the sector heating unit can also independently control the heating power, so as to realize the simulation of various intake air distortion flow fields with different temperature gradients and circumferential, radial, and combined steady-state temperatures.

[0046] 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 electric heating type heating modules. Exemplarily, the electric heating type heating module can be a heating element in the form of a resistance wire, such as a nickel-chromium alloy resistance wire, so as to achieve high-temperature heating with high temperature resistance and oxidation resistance; the electric heating type heating module can also adopt a heating element in the form of a heating tube, such as a heating tube with an insulating material filled inside a metal tube, to achieve efficient heating of the intake air.

[0047] The unit interval 6 is arranged between adjacent sector heating units to prevent thermal cross-disturbance between adjacent sector heating units. In some embodiments of the present application, the unit interval 6 is a hollow support plate-like structure, and its interior is filled with a flame-retardant heat-insulating material, which is used to eliminate thermal cross-disturbance, reduce the heat exchange between adjacent sector heating units, and improve the control accuracy of the temperature distortion range. Exemplarily, the flame-retardant heat-insulating material can be an inorganic flame-retardant heat-insulating material - such as rock wool, so as to achieve high temperature resistance and good heat insulation and sound absorption performance; the flame-retardant heat-insulating material can also be an organic flame-retardant heat-insulating material - such as flame-retardant polystyrene, so as to achieve good heat insulation performance; the flame-retardant heat-insulating material can also be other types of flame-retardant heat-insulating materials - such as ceramic fiber, to achieve a light and soft arrangement at high temperatures.

[0048] In a preferred embodiment of the present application, the intake air temperature distortion generating device 10 further includes an inlet protection net 7. The inlet protection net 7 is arranged and installed at the front end of the heater 5 close to the inlet flow channel 1, and is used to prevent foreign objects in the intake air from hitting the heater 5, and its diameter size is the same as that of the installation housing 3.

[0049] In a preferred embodiment of the present application, the intake air temperature distortion generating device 10 further includes an outlet protection net 8. The outlet protection net 8 is installed at the outlet position of the variable flow passage 4 close to the outlet passage 2 to prevent foreign objects 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 passage 2.

[0050] As Figure 3 and Figure 4 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. 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 intensity. In some embodiments of the present application, the inlet protection net 7 and the outlet protection net 8 can be made of stainless steel, such as 316 or 316L stainless steel, etc., to achieve good corrosion resistance on the basis of meeting the structural strength; the inlet protection net 7 and the outlet protection net 8 can also be made of high-strength alloy steel, such as HSLA alloy steel, etc., to achieve better toughness on the basis of meeting the structural strength. Preferably, the mesh gap of the inlet protection net 7 in the present application is larger than the mesh gap of the outlet protection net 8, so as to play a role in protecting foreign objects and gradually screening, and improve the safety protection ability.

[0051] The intake air temperature distortion generating device of the present application adopts a fan-shaped heating unit in an annular array distribution form. The fan-shaped heating unit samples modular multi-group independently controlled multi-zone heating modules, and each heating module can adjust the power independently, so as to simulate circumferential, radial, and combined steady-state temperature distortions.

[0052] As Figure 5 shown are schematic diagrams of various circumferential steady-state temperature distortions provided in this embodiment of the present application. By controlling one or more zones of the fan-shaped heating unit, circumferential steady-state temperature distortion simulation is achieved. Exemplarily, one fan-shaped heating unit can be controlled to heat, and at this time, temperature distortion can be achieved within a 60° range of the fan; or, two fan-shaped heating units opposite to the center can be controlled to heat, and at this time, temperature distortion can be achieved within a 60° range of the two opposite fans.

[0053] As Figure 6 shown are schematic diagrams of various radial steady-state temperature distortions provided in this embodiment of the present application. By controlling the heating modules in each zone of all the fan-shaped heating units simultaneously, radial steady-state temperature distortion simulation is achieved. Exemplarily, the inner zone heating modules 51 of 6 fan-shaped heating units are controlled to heat simultaneously, so as to generate temperature distortion in the inner ring; or, the inner zone heating modules 51 and the middle zone heating modules 52 of 6 fan-shaped heating units are controlled to heat simultaneously, so as to generate temperature distortion in the inner ring and the middle ring.

[0054] As shown Figure 7 in the figure, it is a schematic diagram of various combined steady-state temperature distortions provided in this embodiment of the present application. By combining and controlling the sector heating units and the heating modules in each zone, the simulation of combined steady-state temperature distortion is realized. Exemplarily, the outer zone heating module 53 and the inner zone heating module 51 of two sector heating units opposite to the center of the circle are controlled to heat, so as to generate temperature distortions in the outer ring and the inner ring within a 60° range of the opposite sectors.

[0055] The intake air temperature distortion generating device provided by the present application has the following advantages:

[0056] 1) By using sector heating units arranged in an annular array and independently controlled in zones, combined with inner / middle / outer zone heating modules with independently controllable power, various intake distortion flow fields such as circumferential, radial, and combined steady-state temperature can be simulated;

[0057] 2) By using a unit interval of 6, the thermal cross-disturbance phenomenon between adjacent sector heating units can be effectively eliminated, the heat exchange between adjacent sector heating units can be reduced, heat loss can be reduced, and the control accuracy of the temperature distortion range can be improved;

[0058] 3) Based on the design of the variable flow channel 4, the gas flow rate through the heater 5 is significantly reduced, losses are reduced, and the heat exchange effect is improved;

[0059] 4) By adopting a safety protection structure with two protective nets, the risk of foreign objects hitting the test equipment can be effectively eliminated, and the safety protection ability can be improved.

[0060] The above is only the specific implementation manner 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 those skilled in the art within the technical scope disclosed by the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claimed rights.

Claims

1. An intake air temperature distortion generating device, characterized in that, Comprising: An inlet flow passage (1); An outlet flow passage (2) connected to a downstream compression system (20); An installation housing (3) and a variable-radius flow passage (4) arranged between the inlet flow passage (1) and the outlet flow passage (2); A heater (5) arranged inside the installation housing (3), the heater (5) comprising a plurality of circumferentially distributed sector-shaped heating units; A unit interval (6) arranged between adjacent sector-shaped heating units for preventing thermal cross-disturbance between adjacent sector-shaped heating units; Wherein, the sector-shaped heating unit comprises an inner zone heating module (51), a middle zone heating module (52) and an outer zone heating module (53), 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, and by controlling each sector-shaped heating unit in zones and 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 sector-shaped heating unit separately, a variety of intake air distortion flow field simulations with different temperature gradients and circumferential, radial and combined steady-state temperatures are realized.

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 passage (2) are determined according to the intake 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 housing (3) is covered with a heat-insulating material for reducing heat dissipation.

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

5. The intake air temperature distortion generating device according to claim 1, wherein, The number of the sector-shaped heating units is determined according to the temperature distortion simulation target.

6. The intake air temperature distortion generating device according to claim 5, 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 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 ( 8. The intake air temperature distortion generating device according to claim 1, characterized in that, ​ 9. The intake air temperature distortion generating device according to claim 1, characterized in that ​ 10. The intake air temperature distortion generating device according to claim 9, characterized in that, ​

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