A high-speed hot air flow generating device, method and sensor ablation test system

Abstract

The present invention provides a high-speed hot air flow generating device, method and sensor ablation test system, the device includes a metal shell, a combustion chamber structure body and a closed metal pipeline; the combustion chamber structure body is arranged in the metal shell, the combustion chamber structure body is a closed structure with a cavity inside, and the closed structure has four input interfaces and output interfaces, the four input interfaces are respectively connected to a methane injection channel, an oxygen injection channel, a compressed air injection channel and an inert gas injection channel, and are used to input methane gas with a first preset pressure, oxygen with a second preset pressure, and compressed air and inert gas with adjustable pressure into the cavity respectively, and the output interface is connected to a hot air flow injection outlet, and a hot air flow is generated by igniting at the hot air flow injection outlet. The technical solution of the present invention is applied to solve the technical problem that the temperature and speed of the hot air flow in the prior art cannot meet the requirements of the dynamic thermal performance ablation test of the total temperature and total pressure sensor.

Description

Technical Field

[0001] The present invention relates to the technical field of total temperature and total pressure sensor ablation test, and in particular to a high-speed hot air flow generating device, method and sensor ablation test system. Background Art

[0002] The total temperature and total pressure sensor is mainly used to measure the total temperature and total pressure of the atmosphere. The total pressure measurement is based on the measurement requirements of FADS. By measuring the total pressure and static pressure, the incoming flow Mach number and altitude are obtained, and then the aircraft control is involved. The total temperature measurement is to obtain the static temperature, static pressure and density of the incoming flow by measuring the total temperature of the incoming flow in real time, combining the total pressure and static pressure, and obtain the atmospheric parameters of the aircraft along the flight trajectory. During the development process, it is necessary to carry out a dynamic thermal performance ablation test of the total temperature and total pressure sensor. At present, the existing ablation test uses an industrial standard flame spray gun, which can generate a subsonic hot air flow of 1200°C, which cannot fully meet the needs of the dynamic thermal performance ablation test of the total temperature and total pressure sensor. It is urgent to design a generating device that can generate supersonic hot air flow above 1500°C. Summary of the invention

[0003] The present invention provides a high-speed hot air flow generating device, method and sensor ablation test system, which can solve the technical problem in the prior art that the hot air flow temperature and speed cannot meet the requirements of the dynamic thermal performance ablation test of the total temperature and total pressure sensor.

[0004] According to one aspect of the present invention, a high-speed hot air flow generating device is provided, the device comprising:

[0005] A metal shell, on which a cooling medium input interface, a cooling medium output interface, a methane injection channel, an oxygen injection channel, a compressed air injection channel, an inert gas injection channel and a hot air flow injection outlet are arranged;

[0006] A combustion chamber structural body, wherein the combustion chamber structural body is arranged in a metal shell, and the combustion chamber structural body is a closed structure having a cavity inside, and the closed structure has a first input interface, a second input interface, a third input interface, a fourth input interface and an output interface, wherein the first input interface is connected to the methane injection channel, and is used to input methane gas having a first preset pressure into the cavity, the second input interface is connected to the oxygen injection channel, and is used to input oxygen having a second preset pressure into the cavity, the output interface is connected to the hot air flow injection outlet, and a hot air flow is generated by igniting the methane gas and oxygen in the cavity at the hot air flow injection outlet, and the hot air flow is ejected and output through the hot air flow injection outlet, the third input interface is connected to the compressed air injection channel, and is used to input compressed air with adjustable pressure into the cavity after ignition to adjust the output pressure of the hot air flow, and the fourth input interface is connected to the inert gas injection channel, and is used to input inert gas with adjustable pressure into the cavity after ignition to adjust the output temperature of the hot air flow;

[0007] A closed metal pipeline is wound around the combustion chamber structure body, and its two ends are respectively connected to the cooling medium input interface and the cooling medium output interface. The cooling medium with a preset temperature circulates in the closed metal pipeline through the cooling medium input interface and the cooling medium output interface to cool the combustion chamber structure body.

[0008] Furthermore, the inert gas is selected from one of nitrogen and helium.

[0009] Furthermore, the cooling medium is water.

[0010] Furthermore, the first preset pressure is 0.1 MPa~0.35 MPa, and the second preset pressure is 0.15 MPa~0.4 MPa.

[0011] According to another aspect of the present invention, a method for generating a high-speed hot air flow using the high-speed hot air flow generating device proposed in the present invention is provided, the method comprising:

[0012] The cooling medium is allowed to circulate in the closed metal pipeline through the cooling medium input interface and the cooling medium output interface;

[0013] The methane injection channel and the oxygen injection channel are opened simultaneously, and the methane gas with a first preset pressure and the oxygen with a second preset pressure are input into the cavity of the combustion chamber structure body for mixing;

[0014] After the preset ventilation time is reached, the methane gas and oxygen in the cavity are ignited at the hot air flow jet outlet to generate a hot air flow, and the hot air flow is ejected and output through the hot air flow jet outlet;

[0015] Open the compressed air injection channel, inject the compressed air into the cavity, and adjust the output pressure of the hot air flow by adjusting the pressure of the compressed air;

[0016] The inert gas injection channel is opened to inject the inert gas into the cavity, and the output temperature of the hot air flow is adjusted by adjusting the pressure of the inert gas.

[0017] Furthermore, the initial pressure of the compressed air and the initial pressure of the inert gas are both 0.15 MPa to 0.2 MPa.

[0018] According to another aspect of the present invention, a sensor ablation test system is provided. The system includes the high-speed hot air flow generating device proposed in the present invention.

[0019] By applying the technical solution of the present invention, a high-speed hot air flow generating device, method and sensor ablation test system are provided. The device uses oxygen as a combustion aid to form a combustible mixture with main fuel methane in a combustion chamber, forms high-temperature combustion gas after ignition, and sprays to form a high-speed hot air flow. The output pressure (flow rate) and output temperature of the hot air flow are adjustable by designing a method of injecting compressed air and inert gas. The device can generate a supersonic airflow with a maximum temperature greater than 1500°C, which can meet the performance verification work of dynamic hot air flow on the ablation of total temperature and total pressure sensor substrate materials, coatings, and total pressure pipelines. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The included drawings are used to provide a further understanding of the embodiments of the present invention, which constitute a part of the specification, are used to illustrate the embodiments of the present invention, and together with the text description, explain the principles of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 A schematic structural diagram of a high-speed hot air flow generating device provided according to a specific embodiment of the present invention is shown.

[0022] The above drawings include the following reference numerals:

[0023] 1. Metal shell; 2. Cooling medium circulation channel; 3. Inert gas injection channel; 4. Hot air flow injection outlet; 5. Compressed air injection channel; 6. Methane injection channel; 7. Oxygen injection channel. DETAILED DESCRIPTION

[0024] It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0026] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0027] like Figure 1 As shown, according to a specific embodiment of the present invention, a high-speed hot air flow generating device is provided, the device comprising:

[0028] A metal shell 1, on which a cooling medium input interface, a cooling medium output interface, a methane injection channel 6, an oxygen injection channel 7, a compressed air injection channel 5, an inert gas injection channel 3 and a hot air flow injection outlet 4 are provided;

[0029] The combustion chamber structure body is arranged in the metal shell 1. The combustion chamber structure body is a closed structure with a cavity inside. The closed structure has a first input interface, a second input interface, a third input interface, a fourth input interface and an output interface. The first input interface is connected to the methane injection channel 6, which is used to input methane gas with a first preset pressure into the cavity. The second input interface is connected to the oxygen injection channel 7, which is used to input oxygen with a second preset pressure into the cavity. The output interface is connected to the hot air flow injection outlet 4, and the methane gas and oxygen in the cavity are ignited at the hot air flow injection outlet 4 to generate a hot air flow. The hot air flow is ejected and output through the hot air flow injection outlet 4. The third input interface is connected to the compressed air injection channel 5, which is used to input compressed air with adjustable pressure into the cavity after ignition to adjust the output pressure of the hot air flow. The fourth input interface is connected to the inert gas injection channel 3, which is used to input inert gas with adjustable pressure into the cavity after ignition to adjust the output temperature of the hot air flow.

[0030] A closed metal pipeline is wound around the combustion chamber structure body, and its two ends are respectively connected to the cooling medium input interface and the cooling medium output interface. The cooling medium with a preset temperature circulates in the closed metal pipeline through the cooling medium input interface and the cooling medium output interface to cool the combustion chamber structure body.

[0031] By applying this configuration, a high-speed hot air flow generating device is provided. The device uses oxygen as a combustion aid to form a combustible mixture with the main fuel methane in the combustion chamber, ignites to form high-temperature combustion gas, and sprays to form a high-speed hot air flow. By designing the injection of compressed air and inert gas, the output pressure (flow rate) and output temperature of the hot air flow can be adjusted. The device can generate a supersonic air flow with a maximum temperature greater than 1500°C, which can meet the performance verification work of dynamic hot air flow on the base material, coating, and total pressure pipeline of the total temperature and total pressure sensor. Compared with the prior art, the technical solution of the present invention can solve the technical problem that the temperature and speed of the hot air flow in the prior art cannot meet the requirements of the dynamic thermal performance ablation test of the total temperature and total pressure sensor.

[0032] Furthermore, in the embodiment of the present invention, the inert gas is selected from one of nitrogen and helium. By inputting the inert gas into the cavity, the concentration of the combustible gas methane and the combustion-supporting agent oxygen is diluted, the combustion speed is reduced, and thus the temperature of the hot air flow is reduced. As a specific embodiment of the present invention, the cooling medium is water, and its temperature is determined according to the actual situation. Figure 1 The cooling medium circulation channel 2 (including the cooling medium input interface and the cooling medium output interface) circulates in the high-speed hot air flow generating device to extract the heat, thereby reducing the temperature of the combustion chamber structure body. In addition, in the embodiment of the present invention, the first preset pressure is 0.1MPa~0.35MPa, and the second preset pressure is 0.15MPa~0.4MPa. As a specific embodiment of the present invention, the first preset pressure is 0.15MPa and the second preset pressure is 0.2MPa. Through this configuration, the ratio and mixing of methane gas and oxygen can be optimized, and a more ideal high-speed hot air flow can be generated.

[0033] According to another aspect of the present invention, a method for generating a high-speed hot air flow using the high-speed hot air flow generating device proposed in the present invention is provided, the method comprising:

[0034] The cooling medium is allowed to circulate in the closed metal pipeline through the cooling medium input interface and the cooling medium output interface;

[0035] The methane injection channel and the oxygen injection channel are opened simultaneously, and the methane gas with a first preset pressure and the oxygen with a second preset pressure are input into the cavity of the combustion chamber structure body for mixing;

[0036] After the preset ventilation time is reached, the methane gas and oxygen in the cavity are ignited at the hot air flow jet outlet to generate a hot air flow, and the hot air flow is ejected and output through the hot air flow jet outlet;

[0037] Open the compressed air injection channel, inject the compressed air into the cavity, and adjust the output pressure of the hot air flow by adjusting the pressure of the compressed air;

[0038] The inert gas injection channel is opened to inject the inert gas into the cavity, and the output temperature of the hot air flow is adjusted by adjusting the pressure of the inert gas.

[0039] Furthermore, in the embodiment of the present invention, the initial pressure of the compressed air and the initial pressure of the inert gas are both 0.15 MPa to 0.2 MPa.

[0040] For an exemplary description of this method, please refer to the aforementioned exemplary description of the high-speed hot air flow generating device, which will not be repeated here. In this way, a high-speed hot air flow generating method is provided, which forms a combustible mixture with the main fuel methane as oxygen as a combustion aid in the combustion chamber, forms a high-temperature combustion gas after ignition, and sprays to form a high-speed hot air flow. The output pressure (flow rate) and output temperature of the hot air flow are adjustable by designing the injection of compressed air and inert gas. The device can generate a supersonic airflow with a maximum temperature greater than 1500°C, which can meet the performance verification work of dynamic hot air flow on the substrate material, coating, and total pressure pipeline ablation of the total temperature and total pressure sensor.

[0041] In order to facilitate a clearer understanding of the high-speed hot air flow generation method provided by the present invention, the above-mentioned processes are described in detail below by taking practical application as an example. It should be known to those skilled in the art that this example is only for a clearer understanding of the high-speed hot air flow generation method provided by the present invention, and does not impose any technical limitation on it. The hot air flow generation process includes the following steps:

[0042] Step 1: Inject cooling water into the hot air flow generating device;

[0043] In order to ensure the normal operation of the combustion chamber structure in the hot air flow generating device, it is necessary to cool it during its operation. The combustion chamber structure is installed in a stable position inside the metal shell 1, and the externally supplied cooling water is connected through the cooling water circulation channel in the device, and the water temperature is monitored by an external instrument to be lower than 20°C.

[0044] Step 2: Injection and combustion of methane and oxygen into the combustion chamber structure of the hot gas flow generating device;

[0045] After confirming that the temperature of the cooling water supplied by the cooling water circulation channel of the device is normal, open the exhaust device in the environmental facilities to ensure normal circulation of the ambient air. Methane and oxygen are injected into the cavity of the combustion chamber structure body through the methane injection channel 6 and the oxygen injection channel 7 to mix. The ventilation flow pressure is 0.1 MPa ~ 0.35 MPa for methane and 0.15 MPa ~ 0.4 MPa for oxygen. After ventilation for 10s ~ 15s, ignite at the hot air flow injection outlet 4 to make it burn.

[0046] Step 3: Injecting compressed air into the combustion chamber structure of the hot air flow generating device;

[0047] In order to ensure the ablation of the base material, coating and total pressure pipeline of the total temperature and total pressure sensor, the hot air flow burned in the combustion chamber structure body needs to be sprayed onto the total temperature and total pressure sensor under test through the hot air flow injection outlet 4, and compressed air is injected into the cavity of the combustion chamber structure body through the compressed air injection channel 5 to accelerate the hot air flow. The initial flow pressure of the compressed air injection is 0.15MPa~0.2MPa, and the pressure is gradually increased according to the relative position of the hot air flow injection outlet 4 and the total temperature and total pressure sensor under test, and the air flow injection distance of the hot air flow injection outlet is adjusted to ensure that the hot air flow covers the total temperature and total pressure sensor under test.

[0048] Step 4: Injecting nitrogen into the combustion chamber structure of the hot air flow generating device;

[0049] After completing the above steps 1 to 3, nitrogen is injected into the cavity of the combustion chamber structure body through the nitrogen injection channel 3. The initial flow pressure of nitrogen is 0.15MPa~0.2MPa. The temperature of the hot air flow sprayed onto the test total temperature and total pressure sensor is detected by an external sensor. The nitrogen flow pressure is increased by adjustment and the hot air flow temperature is reduced by adjustment.

[0050] According to another aspect of the present invention, a sensor ablation test system is provided, the system includes the high-speed hot air flow generating device proposed in the present invention. Since the high-speed hot air flow generating device proposed in the present invention can output a high-speed hot air flow with adjustable pressure and temperature, the maximum flow rate can reach supersonic speed, and the maximum temperature can reach above 1500°C, therefore, it is applied to the total temperature and total pressure sensor ablation test system, which can meet the performance verification work of dynamic hot air flow on the total temperature and total pressure sensor base material, coating, total pressure pipeline ablation, etc.

[0051] In summary, the present invention provides a high-speed hot air flow generating device, method and sensor ablation test system. The device uses oxygen as a combustion aid to form a combustible mixture with the main fuel methane in the combustion chamber, ignites to form high-temperature combustion gas, and sprays to form a high-speed hot air flow. The output pressure (flow rate) and output temperature of the hot air flow are adjustable by designing the injection of compressed air and inert gas. The device can generate a supersonic air flow with a maximum temperature greater than 1500°C, which can meet the performance verification work of dynamic hot air flow on the total temperature and total pressure sensor base material, coating, total pressure pipeline ablation. Compared with the prior art, the device can solve the technical problem that the temperature and speed of the hot air flow in the prior art cannot meet the requirements of the dynamic thermal performance ablation test of the total temperature and total pressure sensor.

[0052] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0053] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for generating a high-speed hot air flow using a high-speed hot air flow generating device, characterized in that: The device comprises a metal casing (1), a combustion chamber structure body and a closed metal pipeline; The metal shell (1) is provided with a cooling medium input interface, a cooling medium output interface, a methane injection channel (6), an oxygen injection channel (7), a compressed air injection channel (5), an inert gas injection channel (3) and a hot air flow injection outlet (4); The combustion chamber structure body is arranged in the metal shell (1), and the combustion chamber structure body is a closed structure with a cavity inside. The closed structure has a first input interface, a second input interface, a third input interface, a fourth input interface and an output interface. The first input interface is connected to the methane injection channel (6) and is used to input methane gas with a first preset pressure into the cavity. The second input interface is connected to the oxygen injection channel (7) and is used to input oxygen with a second preset pressure into the cavity. The output interface is connected to the hot air flow injection channel (8) and is used to inject oxygen with a second preset pressure into the cavity. The hot gas flow is generated by igniting the methane gas and oxygen in the cavity at the hot gas flow injection outlet (4), and the hot gas flow is ejected and output through the hot gas flow injection outlet (4); the third input interface is connected to the compressed air injection channel (5), and is used to input the compressed air with adjustable pressure into the cavity after ignition to adjust the output pressure of the hot gas flow; the fourth input interface is connected to the inert gas injection channel (3), and is used to input the inert gas with adjustable pressure into the cavity after ignition to adjust the output temperature of the hot gas flow; The closed metal pipeline is wound around the combustion chamber structure body, and the two ends are respectively connected to the cooling medium input interface and the cooling medium output interface, and the cooling medium with a preset temperature circulates in the closed metal pipeline through the cooling medium input interface and the cooling medium output interface to cool the combustion chamber structure body; The method comprises the following steps: The cooling medium is allowed to circulate in the closed metal pipeline through the cooling medium input interface and the cooling medium output interface; The methane injection channel and the oxygen injection channel are opened simultaneously, and the methane gas with a first preset pressure and the oxygen with a second preset pressure are input into the cavity of the combustion chamber structure body for mixing; After the preset ventilation time is reached, the methane gas and oxygen in the cavity are ignited at the hot air flow jet outlet to generate a hot air flow, and the hot air flow is ejected and output through the hot air flow jet outlet; Opening the compressed air injection channel to inject compressed air into the cavity, and adjusting the output pressure of the hot air flow by adjusting the pressure of the compressed air; Opening the inert gas injection channel, injecting the inert gas into the cavity, and adjusting the output temperature of the hot gas flow by adjusting the pressure of the inert gas; Among them, the first preset pressure is 0.1MPa~0.35MPa, the second preset pressure is 0.15MPa~0.4MPa, the initial flow pressure of the compressed air injection is 0.15MPa~0.2MPa, and the initial flow pressure of the inert gas injection is 0.15MPa~0.2MPa.

2. The method according to claim 1, characterized in that The inert gas is selected from nitrogen and helium.

3. The method according to claim 2, characterized in that The cooling medium is water.

Images