Wind tunnel dust generator

Abstract

The utility model belongs to the technical field of wind tunnel experiment equipment, and particularly relates to a wind tunnel dust generator which is provided with an airflow pipeline of an experiment section, and the airflow pipeline is a closed loop. The output end of the dust generator extends into the airflow pipeline through a powder outlet pipeline; the fan is arranged in the airflow pipeline and forms airflow circulation along the airflow pipeline, the powder outlet direction of the powder outlet pipeline is opposite to the airflow circulation dust direction, and the fan is located on the windward side of the experiment section; the multi-mode sensor monitoring group is arranged in the experiment section and corresponds to the output end of the fan; and the concentration regulation and control assembly is arranged in the airflow pipeline, is in signal connection with the multi-mode sensor monitoring group, and is used for regulating the dust concentration in the airflow pipeline based on the monitoring data of the multi-mode sensor monitoring group.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the wind tunnel experiment equipment technical field, concretely is a wind tunnel dust generator. BACKGROUND

[0002] The wind tunnel dust generator is widely applied to aerodynamics research, particle sensor calibration, material dust resistance test and other fields, and its core function is to stably generate and maintain a specific dust field in a controllable airflow environment;

[0003] At present, the closed return flow wind tunnel is widely used due to its high airflow circulation efficiency and low energy consumption. For example, the public patent document (CN202221588287.0) discloses a closed return flow aerosol wind tunnel capable of automatically removing dust, which realizes dust removal after experiment by setting a dust remover and drives airflow circulation by a fan. However, the technical scheme still has the following disadvantages:

[0004] 1. The fan position leads to insufficient energy efficiency: the traditional closed wind tunnel usually sets the fan at the end of the wind tunnel, resulting in a long airflow path and large energy loss, which is difficult to meet the energy saving demand in a high-pressure and large-flow experimental environment.

[0005] 2. Cannot realize real-time dust removal regulation during experiment: the existing technology can only remove dust after experiment by the dust remover, and cannot dynamically adjust the dust concentration during experiment, resulting in that the experimental data is affected by dust settlement or concentration fluctuation.

[0006] Based on the above technical problems, the present application provides a wind tunnel dust generator. CONTENT OF THE UTILITY MODEL

[0007] In view of the deficiencies of the prior art, the utility model aims to provide a wind tunnel dust generator to solve the technical problems of insufficient energy efficiency caused by the fan position and inability to realize real-time dust removal regulation during experiment.

[0008] The utility model adopts the scheme: a wind tunnel dust generator, characterized by comprising:

[0009] An airflow pipeline with an experimental section, the airflow pipeline being a closed loop;

[0010] A dust generator, the output end of which extends to the inside of the airflow pipeline through an outflow pipeline;

[0011] A fan, which is arranged inside the airflow pipeline and forms airflow circulation along the airflow pipeline, the outflow direction of the outflow pipeline being opposite to the direction of the dust in the airflow circulation, and the fan being located at the upwind side of the experimental section;

[0012] A multi-modal sensor monitoring group, which is arranged inside the experimental section, and the outflow direction of the fan is opposite to the input end of the multi-modal sensor monitoring group;

[0013] A concentration regulating assembly is arranged inside the airflow pipeline and connected with the multi-modal sensor monitoring group, and adjusts the dust concentration in the airflow pipeline based on the monitoring data of the multi-modal sensor monitoring group.

[0014] Preferably, the airflow pipeline comprises a contraction section, an experimental section, an expansion section, a connection section one, a stable section and a connection section two connected in sequence, forming a ring-shaped closed structure.

[0015] The contraction section and the expansion section are both gradually changing horn-shaped, and the opening end close to the experimental section is smaller than the opening end far from the experimental section.

[0016] The connection section one and the connection section two are provided with a set of guide vanes.

[0017] At least two groups of parallel arranged rectifier grids are arranged in the contraction section, and the rectifier grid rectification direction is consistent with the airflow circulation direction.

[0018] The experimental section is detachably connected with a sensor placement tool matched with the multi-modal sensor monitoring group.

[0019] By adopting the above technical solution, the contraction section and the expansion section are both gradually changing horn-shaped, and the opening end close to the experimental section is smaller than the opening end far from the experimental section. The contraction section can accelerate the airflow, so that the airflow enters the experimental section more uniformly, providing stable airflow conditions for the experiment; the expansion section can slow down the airflow, reducing the impact of the airflow on the subsequent components, protecting the normal operation of the equipment.

[0020] Preferably, the multi-modal sensor monitoring group comprises an air volume sensor, an air speed sensor, an air pressure sensor, a particulate matter sensor, a temperature sensor and a humidity sensor, each sensor is detachably connected with the placement tool, and is uniformly distributed on the sensor placement tool.

[0021] By adopting the above technical solution, the multi-modal sensor monitoring group comprises an air volume sensor, an air speed sensor, an air pressure sensor, a particulate matter sensor, a temperature sensor and a humidity sensor, each sensor is detachably connected with the placement tool, and is uniformly distributed on the sensor placement tool. Through these sensors, the air volume, air speed, air pressure, particulate matter concentration, temperature and humidity parameters of the airflow can be monitored in real time, providing accurate data support for the concentration regulating assembly, so as to realize accurate adjustment of the dust concentration in the airflow pipeline. At the same time, the detachable connection mode also facilitates the replacement and calibration of the sensors, ensuring the measurement accuracy of the sensors.

[0022] Preferably, the concentration regulating assembly comprises an electrostatic precipitator, and the electrostatic precipitator is fixedly arranged at the input end of the connection section one.

[0023] By adopting the technical scheme, the concentration regulation assembly comprises an electrostatic precipitator fixed to the input end of the connecting section one and connected with the multi-modal sensor monitoring group. According to the monitoring data of the multi-modal sensor monitoring group, the electrostatic precipitator can timely adjust the dust concentration in the airflow pipeline, so that the dust concentration is kept within the range required by the experiment.

[0024] Preferably, the airflow pipeline and the fan are located at the output end of the connecting section two, and the fan is located at the rear end of the airflow pipeline.

[0025] Preferably, the end of the powder outlet pipeline extending into the airflow pipeline is provided with a dispersion nozzle, the dispersion nozzle is conical, and a plurality of powder outlet holes are uniformly distributed on the surface of the dispersion nozzle.

[0026] By adopting the technical scheme, the end of the powder outlet pipeline extending into the airflow pipeline is provided with a dispersion nozzle which is conical and has a plurality of powder outlet holes uniformly distributed on the surface. The dispersion nozzle can more uniformly disperse the dust into the airflow, further improve the dispersion effect of the dust, and ensure the uniformity of the dust concentration in the experimental section.

[0027] Preferably, the fan is a variable frequency axial flow fan, and the variable frequency axial flow fan is electrically connected with a controller. The controller adjusts the rotating speed of the fan according to the wind speed data fed back by the multi-modal sensor monitoring group.

[0028] By adopting the technical scheme, the fan is a variable frequency axial flow fan, and is electrically connected with a controller. The controller adjusts the rotating speed of the fan according to the wind speed data fed back by the multi-modal sensor monitoring group. This design can realize accurate control of the airflow speed, flexibly adjust the airflow speed according to the experimental requirements, and also reduce energy consumption and improve the operating efficiency of the equipment.

[0029] Preferably, at least three groups of guide vanes are arranged in the guide vane group, and the guide vanes are uniformly distributed in the connecting section one and the connecting section two in an arc shape.

[0030] By adopting the technical scheme, at least three groups of guide vanes are arranged in the connecting section one and the connecting section two in an arc shape. The guide vanes can guide the airflow to smoothly turn, reduce the turbulence and energy loss of the airflow at the turning place, further improve the stability and uniformity of the airflow, and thus ensure the accuracy of the experimental results.

[0031] Preferably, an observation window is arranged on the experimental section.

[0032] By adopting the technical scheme, an observation window is arranged on the experimental section. The airflow and dust distribution in the experimental section can be observed in real time through the observation window, which facilitates the experimental personnel to timely grasp the experimental progress, adjust the experimental parameters, and ensure the smooth progress of the experiment.

[0033] Preferably, a positive pressure regulating valve is arranged on the airflow pipeline.

[0034] By adopting the technical scheme, when the pressure inside the airflow pipeline is too large, the operator can adjust the pressure inside the airflow pipeline through the active pressure regulating valve.

[0035] Beneficial effects:

[0036] Optimization of fan position: the fan is arranged inside the airflow pipeline and located on the upwind side of the test section, i.e., the front end of the airflow pipeline, which shortens the circulation path of the airflow and reduces the energy loss of the airflow in long-distance transmission, and especially in the high-pressure and large-flow experimental environment, the energy efficiency is significantly improved.

[0037] Real-time monitoring and accurate regulation: the multi-modal sensor monitoring group is arranged in the test section, which can monitor the dust state parameters in the airflow pipeline in real time and accurately, and the concentration regulating component dynamically adjusts the dust concentration in the airflow pipeline according to the monitoring data, so that the experiment is carried out in a specific dust concentration environment, and the accuracy and reliability of the experimental data are improved. BRIEF DESCRIPTION OF DRAWINGS

[0038] Fig. 1 is the overall structure schematic view of the utility model.

[0039] Fig. 2 is the sensor placement tool and multi-modal sensor monitoring group installation schematic view of the utility model.

[0040] Fig. 3 is the principle diagram of the utility model.

[0041] REFERENCE SIGNS:

[0042] 1, airflow pipeline; 11, contraction section; 12, test section; 13, expansion section; 14, connecting section one; 15, stable section; 16, connecting section two;

[0043] 2, dust generator; 21, powder outlet pipeline;

[0044] 3, fan;

[0045] 4, multi-modal sensor monitoring group; 5, concentration regulating component; 6, guide vane group; 7, rectifier grid; 8, sensor placement tool; 9, observation window; 10, active pressure regulating valve. DETAILED DESCRIPTION

[0046] The foregoing and other technical contents, characteristics and effects of the utility model will be clearly presented in the following detailed description of the embodiments in cooperation with the reference to the accompanying drawings. Figs. 1-3 The structural contents mentioned in the following embodiments are all referred to the drawings.

[0047] The various exemplary embodiments of the utility model will be described below with reference to the accompanying drawings.

[0048] Embodiment 1, a wind tunnel dust generator, characterized in that it comprises the following structure:

[0049] Air flow pipeline 1, which is a closed loop. It specifically includes a contraction section 11, an experimental section 12, an expansion section 13, a connection section one 14, a stable section 15, and a connection section two 16 connected in turn, together forming a ring-shaped closed structure. Among them, the contraction section 11 and the expansion section 13 are both gradually changing horn-shaped, and the size of the opening end close to the experimental section 12 is smaller than that of the opening end away from the experimental section 12; The connection section one 14 and the connection section two 16 are provided with a set of guide vanes 6; The contraction section 11 is provided with at least two groups of parallel arranged fairing grids 7, and the fairing direction of the fairing grid 7 is consistent with the air flow circulation direction. The experimental section 12 is detachably connected with a sensor placement tool 8 cooperating with a multi-modal sensor monitoring group 4.

[0050] Dust generator 2, the output end of which extends to the inside of the air flow pipeline 1 through the powder outlet pipeline 21.

[0051] Fan 3, which is arranged inside the air flow pipeline 1 and can form air flow circulation along the air flow pipeline 1, the powder outlet direction of the powder outlet pipeline 21 is opposite to the direction of the dust in the air flow circulation, and the fan 3 is located on the upwind side of the experimental section 12.

[0052] Multi-modal sensor monitoring group 4, which is arranged inside the experimental section 12, and the air outlet direction of the fan 3 is opposite to the input end of the multi-modal sensor monitoring group 4.

[0053] Concentration control assembly 5, which is arranged inside the air flow pipeline 1 and is signal connected with the multi-modal sensor monitoring group 4, can adjust the dust concentration in the air flow pipeline 1 based on the monitoring data of the multi-modal sensor monitoring group 4.

[0054] In use, first start the fan 3 to form air flow circulation along the closed loop of the air flow pipeline 1 (contraction section 11-experimental section 12-expansion section 13-connection section one 14-stable section 15-connection section two 16). When the air flow passes through the contraction section 11, the gradually changing horn-shaped structure accelerates the air flow, and the fairing grid 7 further straightens to ensure uniform and stable air flow. Then, the dust generator 2 sprays powder into the air flow pipeline 1 through the powder outlet pipeline 21, and since the powder outlet direction is opposite to the movement direction of the dust in the air flow circulation, the dust is fully dispersed under the action of the reverse air flow. The multi-modal sensor monitoring group 4 monitors the air flow parameters (such as wind speed, air volume, dust concentration, etc.) in the experimental section 12 in real time, and the concentration control assembly 5 dynamically adjusts the dust concentration according to the monitoring data to meet the experimental requirements. The sensor placement tool 8 in the experimental section 12 facilitates the installation and disassembly of the multi-modal sensor monitoring group 4, improving the flexibility of the equipment.

[0055] Embodiment 2, a wind tunnel dust generator, on the basis of embodiment 1, the multi-modal sensor monitoring group 4 is mainly composed of air volume sensors, air speed sensors, air pressure sensors, particulate matter sensors, temperature sensors and humidity sensors. Each sensor is detachably connected with the sensor placement tool 8, and is uniformly distributed on the sensor placement tool 8.

[0056] The concentration regulation assembly 5 comprises an electrostatic precipitator fixedly arranged at the input end of the connecting section one 14.

[0057] The airflow duct 1 and the fan 3 are located at the output end of the connecting section two 16, and the fan 3 is arranged at the rear end of the airflow duct 1.

[0058] The end of the powder outlet duct 21 extending into the airflow duct 1 is provided with a dispersion nozzle, which is conical and has a plurality of powder outlet holes uniformly distributed on the surface.

[0059] In use, the air volume sensors, air speed sensors, air pressure sensors, particulate matter sensors, temperature sensors and humidity sensors of the multi-modal sensor monitoring group 4 are detachably installed on the sensor placement tool 8 and are uniformly distributed, ensuring comprehensive and balanced monitoring of the airflow parameters in the experimental section 12. The above-mentioned sensors are electrically connected with the controller. The electrostatic precipitator of the concentration regulation assembly 5 is fixed at the input end of the connecting section one 14. Without generating significant noise, the power of the electrostatic precipitator can be adjusted by the controller to accurately regulate the dust concentration in the airflow duct 1. The conical dispersion nozzle at the end of the powder outlet duct 21 is densely covered with powder outlet holes, allowing the dust to be uniformly dispersed in the form of atomization, avoiding excessive local concentration. The airflow duct 1 and the fan 3 are located at the output end of the connecting section two 16, and the fan 3 is rear-mounted, optimizing the airflow circulation path and reducing energy loss.

[0060] Embodiment 3, a wind tunnel dust generator, on the basis of embodiment 1 or 2, the fan 3 is a variable frequency axial flow fan, which is electrically connected with the controller. The controller can adjust the speed of the fan 3 according to the wind speed data fed back by the multi-modal sensor monitoring group 4.

[0061] In use, the fan 3 adopts a variable frequency axial flow fan, the speed of which can be dynamically adjusted by the controller according to the wind speed data fed back by the multi-modal sensor monitoring group 4. When a specific wind speed is required for the experiment, the controller receives the signal of the wind speed sensor in real time, automatically adjusts the speed of the fan 3, thereby accurately controls the speed of the airflow circulation, and meets the requirements of different experimental scenarios for airflow conditions. The design of the variable frequency axial flow fan has high efficiency and energy saving, and at the same time improves the intelligent degree of the system.

[0062] In the embodiment 4, the wind tunnel dust generator, based on any one of the embodiments 1 to 3, at least three groups of guide vanes are arranged in the guide vane group 6, and the guide vanes are uniformly distributed in the connecting section one 14 and the connecting section two 16 in an arc shape.

[0063] In use, the guide vane group 6 in the connecting section one 14 and the connecting section two 16 contains at least three groups of arc-shaped guide vanes, and is uniformly distributed, when the air flow passes through the connecting section one 14 and the connecting section two 16, the arc-shaped guide vanes guide the air flow direction, reduce the air flow separation and vortex phenomenon, make the air flow more smoothly into the steady section 15 and the experimental section 12, the design of the guide vane group 6 effectively improves the flow field uniformity in the air flow pipeline 1, reduces the influence of air flow disturbance on the experimental results, especially suitable for the experimental scene with higher requirements for air flow stability.

[0064] In the embodiment 5, based on any one of the embodiments 1 to 4, the observation window 9 is arranged on the experimental section 12.

[0065] In the embodiment 6, based on any one of the embodiments 1 to 4, the air flow pipeline 1 is provided with the active pressure regulating valve 10.

[0066] The above is only for the purpose of illustrating the present application, it should be understood that the present application is not limited to the above embodiments, various modifications in accordance with the idea of the present application are within the scope of the present application.

Claims

1. A wind tunnel smoke generator, characterized by, The application relates to a dust concentration control device for a dust concentration control experiment. The device comprises: an airflow pipeline (1) with an experimental section (12), wherein the airflow pipeline (1) is a closed loop; a dust generator (2) with an output end extending into the airflow pipeline (1) through a powder outlet pipeline (21); a fan (3) arranged in the airflow pipeline (1) and forming an airflow circulation along the airflow pipeline (1), wherein the powder outlet direction of the powder outlet pipeline (21) is opposite to the direction of the dust airflow circulation, and the fan (3) is located on the upwind side of the experimental section (12); a multi-modal sensor monitoring group (4) arranged in the experimental section (12), wherein the air outlet direction of the fan (3) is opposite to the input end of the multi-modal sensor monitoring group (4); 2. A wind tunnel dust generator according to claim 1, wherein a concentration control assembly (5) arranged in the airflow pipeline (1) and connected with the multi-modal sensor monitoring group (4) in signal, and the dust concentration in the airflow pipeline (1) is adjusted based on the monitoring data of the multi-modal sensor monitoring group (4). The airflow pipeline (1) comprises a contraction section (11), the experimental section (12), an expansion section (13), a first connecting section (14), a stable section (15) and a second connecting section (16) connected in sequence, and forms a ring-shaped closed structure. The contraction section (11) and the expansion section (13) are both gradually changed in a horn shape, and the opening end close to the experimental section (12) is smaller than the opening end far from the experimental section (12). The first connecting section (14) and the second connecting section (16) are provided with a group of guide vanes (6). The contraction section (11) is provided with at least two groups of parallel arranged rectifier grids (7), and the rectification direction of the rectifier grids (7) is consistent with the airflow circulation direction.

3. A wind tunnel dust generator according to claim 2, wherein The experimental section (12) is detachably connected with a sensor placement tool (8) matched with the multi-modal sensor monitoring group (4).

4. A wind tunnel dust generator according to claim 3, wherein The multi-modal sensor monitoring group (4) comprises an air volume sensor, an air speed sensor, an air pressure sensor, a particulate matter sensor, a temperature sensor and a humidity sensor, each sensor is detachably connected with the sensor placement tool (8), and is uniformly distributed on the sensor placement tool (8).

5. A wind tunnel dust generator according to claim 4, wherein The concentration control assembly (5) comprises an electrostatic precipitator, and the electrostatic precipitator is fixedly arranged at the input end of the first connecting section (14).

6. A wind tunnel smoke generator according to claim 5, wherein The airflow pipeline (1) and the fan (3) are located at the output end of the second connecting section (16), and the fan (3) is located at the rear end of the airflow pipeline (1).

7. A wind tunnel dust generator according to claim 6, wherein The end of the powder outlet pipeline (21) extending into the airflow pipeline (1) is provided with a dispersion nozzle, the dispersion nozzle is in a conical shape, and a plurality of powder outlet holes are uniformly distributed on the surface.

8. A wind tunnel dust generator according to claim 7, wherein The fan (3) is a variable frequency axial flow fan (3), the variable frequency axial flow fan (3) is electrically connected with a controller, and the controller adjusts the rotating speed of the fan (3) according to the air speed data fed back by the multi-modal sensor monitoring group (4).

9. A wind tunnel dust generator according to any one of claims 2 to 8, wherein, At least three groups of guide vanes are arranged in the group of guide vanes (6), and the guide vanes are arc-shaped and uniformly distributed in the first connecting section (14) and the second connecting section (16).

10. A wind tunnel dust generator according to any one of claims 2 to 8, wherein An observation window (9) is arranged on the experimental section (12). The airflow pipeline (1) is provided with a main pressure regulating valve (10).

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