High-speed rail overhead line system line icing real model simulation device

Abstract

The invention discloses a high-speed rail overhead line system line icing real-model simulation device which comprises an environment simulation cabin, a real-model overhead line system module, an air circulation module, a supercooled water spraying module and a humidity control module. An air inlet and an air outlet which are symmetrically distributed are formed in the inner wall of the environment simulation cabin. The real-type contact net module transversely penetrates through the environment simulation cabin, two ends of the real-type contact net module are anchored on the cabin wall, and the air circulation module comprises a fan set arranged on the air inlet side, an air flow circulation channel connected with the air inlet and the air outlet, and a flow field regulation and control structure arranged between the fan set and the contact net; the supercooled water spraying module comprises a spraying assembly located at the top of the cabin body and a supercooled water supply unit communicated with the spraying assembly, and the humidity control module comprises a dehumidification unit and a humidification unit which are independently controlled. Through multi-system cooperative control and true structure adaptive design, high-precision simulation of the icing process of the overhead line system is realized, and the problem of aerodynamic characteristic distortion caused by dissimilar Reynolds numbers of a traditional scaling model is thoroughly avoided.

Description

Technical Field

[0001] The present invention relates to the field of rail transportation technology, and in particular to a high-speed railway contact network line icing real-type simulation device. Background Art

[0002] The safety and reliability of high-speed railway traction power supply systems directly impact train operating efficiency. Catenary icing is a key threat to power supply stability. Under extreme weather conditions such as rime, snow, and mixed rime, icing can cause catenary conductor vibration, insulator flashover, and even structural damage, severely hampering high-speed rail operations during winter.

[0003] Current research on catenary icing primarily relies on observations of natural icing. This is limited by factors such as uncontrollable meteorological conditions, long observation periods, and high data dispersion, making it difficult to systematically replicate the icing formation mechanism. Due to the significant differences between the catenary's unique suspension structure, service environment, and power grid system, existing technologies lack scientific devices specifically designed to simulate catenary icing. This makes it impossible to accurately simulate the icing process of a full-scale catenary under complex meteorological conditions, hindering research on icing growth mechanisms and verifying de-icing technologies. Furthermore, the limited structural dimensions of traditional icing wind tunnels and artificial icing simulation chambers make it impossible to simulate the icing formation process of a full-scale catenary structure. Furthermore, artificial climate simulation chambers cannot adjust wind speed and direction, failing to meet research needs. Therefore, there is an urgent need to develop a full-scale simulation device for icing on high-speed rail catenary lines. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a real-type simulation device for high-speed railway contact network line icing.

[0005] The present invention solves the above-mentioned technical problems with the following technical solutions: A high-speed railway overhead line ice-covered real-type simulation device comprising: The inner wall of the environmental simulation cabin is provided with symmetrically distributed air inlets and outlets; The real catenary module runs horizontally through the environmental simulation cabin and is anchored to the cabin wall at both ends; The air circulation module includes a fan unit arranged on the air inlet side, an air circulation channel connecting the air inlet and the air outlet, and a flow field control structure arranged between the fan unit and the contact network; The supercooled water spray module includes a spray assembly located on the top of the cabin and a supercooled water supply unit connected thereto; Humidity control module, including independently controlled dehumidification unit and humidification unit.

[0006] Furthermore, the flow field control structure includes a honeycomb rectifier and guide vanes with adjustable angles, and the guide vanes are arranged in a stepped manner along the direction of the airflow.

[0007] Furthermore, the air circulation channel is a closed pipeline structure, and a heat exchanger is provided between the air circulation channel and the air inlet.

[0008] Furthermore, the supercooled water supply unit includes an open cooling tower, a water-cooled direct expansion machine, a precooling pump, an ice-coating water tank and an ice-coating pump which are sequentially connected in series through pipelines.

[0009] Furthermore, the spray assembly includes a water delivery pipe connected to a pipe of the cold water supply unit and an adjustable nozzle connected to the water delivery pipe and located above the contact network.

[0010] Furthermore, a plurality of distributed optical fiber sensors are arranged at intervals on the contact line surface of the real contact network module, and the distributed optical fiber sensors are connected to a high-speed image acquisition device.

[0011] Furthermore, the dehumidification unit adopts a rotary dehumidifier.

[0012] Furthermore, the humidifying unit adopts an ultrasonic humidifier.

[0013] The present invention has the following beneficial effects: the high-speed railway contact network line icing real-type simulation device provided by the present invention realizes high-precision simulation of the contact network icing process through multi-system collaborative control and real-type structure adaptation design, completely avoids the aerodynamic characteristic distortion problem caused by Reynolds number dissimilarities in traditional scaled models, and effectively improves the consistency between experimental data such as icing load distribution and conductor dancing and real scenes. In addition, a fiber grating sensor is integrated on the surface of the contact line to collect the icing strain distribution in real time, and is simultaneously combined with a high-speed microscopic camera system to capture the ice crystal growth interface, forming a "mechanical-morphological" dual-modal database, providing a high-confidence test platform for the development of de-icing devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 1 The reference numerals shown in the figure represent respectively: 1-environmental simulation cabin, 2-spray assembly, 3-supercooled water supply unit, 4-dehumidification unit, 5-humidification unit, 6-open cooling tower, 7-water-cooled direct expansion machine, 8-precooling pump, 9-icing water tank, 10-icing pump, 11-water supply pipeline, 12-adjustable nozzle, 13-high-speed image acquisition device. DETAILED DESCRIPTION

[0015] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0016] like Figure 1As shown, a high-speed railway contact network line icing real simulation device includes an environmental simulation cabin 1, a real contact network module, an air circulation module, a supercooled water spray module and a humidity control module.

[0017] The environmental simulation chamber 1 measures 60m long, 2m wide, and 2m high. It has a negative pressure bearing capacity of ≥60kPa, capable of withstanding ice loads and sudden temperature fluctuations, and operates within a temperature range of -20°C to 60°C. Its inner walls are equipped with symmetrically distributed air inlets and outlets, creating a closed-loop airflow path and maintaining pressure balance within the chamber.

[0018] In this embodiment, a full-scale catenary module is inserted transversely through the environmental simulation cabin 1 and anchored to the cabin wall at both ends, simulating the tension compensation mechanism of an actual catenary. Using a 350 km / h high-speed rail catenary as a prototype, the complete structural system, including the copper-magnesium alloy catenary wire (CTMH-150), droppers, load-bearing cables, and tension compensation devices, is replicated on a 1:1 scale. This model avoids the dynamic distortion caused by the Reynolds number effect in traditional scaled-down models. Furthermore, multiple distributed fiber optic sensors are spaced apart on the contact wire surface of the full-scale catenary module. These sensors collect the strain distribution during icing in real time. These distributed fiber optic sensors are connected to a high-speed image acquisition device 13, which utilizes a high-speed microscope camera to observe the icing process.

[0019] In this embodiment, the air circulation module includes a fan unit located on the air inlet side, an airflow circulation channel connecting the air inlet and outlet, and a flow field control structure arranged between the fan unit and the contact network. This module is mainly used to simulate the natural wind field environment and control the temperature in the cabin. A variable frequency speed-regulating centrifugal fan unit is installed on the contact network side. It is driven by a high-efficiency motor and can accurately adjust the wind speed according to experimental requirements. The typical operating range is 1-15 m / s, covering different working conditions from light breeze to strong wind. Among them, the flow field control structure includes a honeycomb rectifier and adjustable angle guide vanes. The guide vanes are arranged in a stepped manner along the direction of the airflow. The combination of the honeycomb rectifier and the guide vanes is used to eliminate turbulence and achieve precise control of wind direction.

[0020] The air circulation channel is a closed duct structure made of high-strength lightweight alloy materials. Its internal aerodynamics are optimized to reduce wind resistance and energy loss. A heat exchanger is installed between the air circulation channel and the air inlet. The air flows through the heat exchanger to regulate the air flow temperature, ensuring a controllable temperature within the experimental chamber.

[0021] In this embodiment, the supercooled water spray module includes a spray assembly 2 located at the top of the cabin and a supercooled water supply unit 3 connected thereto. The supercooled water supply unit 3 includes an open cooling tower 6, a water-cooled direct expansion machine 7, a pre-cooling pump 8, an ice-coating water tank 9, and an ice-coating pump 10, which are connected in series via pipes. The open cooling tower 6 is used to cool the circulating water from ambient temperature to near wet-bulb temperature. The water-cooled direct expansion machine 7 acts as a deep refrigeration unit, used to drop the water temperature from 15°C-25°C to a supercooled state of 0°C-5°C. The pre-cooling pump 8 acts as a power buffer, used to maintain the stability of the water flow between the cooling tower and the direct expansion machine. The ice-coating water tank 9 is used to store supercooled water energy, maintaining the metastable liquid supercooling of the water in a heat-insulating and pressure-maintaining environment. The ice-coating pump 10 serves as an atomization power source, used to provide adjustable pressure for the spray array.

[0022] The spray assembly 2 includes a water pipe 11 connected to the cold water supply unit and an adjustable nozzle 12 connected to the pipe and positioned above the catenary. The spray assembly 2 is located on the top of the experimental chamber and works with the air circulation module to guide water droplets toward the catenary. By adjusting air and water pressure and changing the stainless steel nozzle, the liquid water content in the chamber and the median diameter of the water droplets are controlled to provide water mist conditions under different icing conditions.

[0023] In this embodiment, the humidity control module includes independently controlled dehumidification unit 4 and humidification unit 5. Dehumidification unit 4 utilizes a rotary dehumidifier that employs silica gel adsorption-regeneration cycle technology, achieving a dew point temperature as low as -40°C, meeting ultra-low humidity requirements. Humidification unit 5 utilizes an ultrasonic humidifier, utilizing piezoelectric ceramics for high-frequency oscillation atomization, with a humidity adjustment range of 10%-95% relative humidity.

[0024] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-speed railway contact network line ice coating real model simulation device, characterized in that: include: An environmental simulation cabin (1) has an inner wall provided with symmetrically distributed air inlets and air outlets; A real catenary module is passed through the environmental simulation cabin (1) transversely and is anchored to the cabin wall at both ends; The air circulation module includes a fan unit arranged on the air inlet side, an air circulation channel connecting the air inlet and the air outlet, and a flow field control structure arranged between the fan unit and the contact network; A supercooled water spray module, comprising a spray assembly (2) located on the top of the cabin and a supercooled water supply unit (3) connected thereto; The humidity control module includes a dehumidification unit (4) and a humidification unit (5) that are independently controlled.

2. The high-speed railway overhead line ice coating real-type simulation device according to claim 1 is characterized in that: The flow field regulating structure includes a honeycomb rectifier and guide vanes with adjustable angles, and the guide vanes are arranged in a stepped manner along the airflow direction.

3. The high-speed railway overhead line ice coating real-type simulation device according to claim 1 is characterized in that: The air circulation channel is a closed pipe structure, and a heat exchanger is provided between the air circulation channel and the air inlet.

4. The high-speed railway overhead line ice coating real-type simulation device according to any one of claims 1 to 3, characterized in that: The supercooled water supply unit (3) comprises an open cooling tower (6), a water-cooled direct expansion machine (7), a precooling pump (8), an ice-coating water tank (9), and an ice-coating pump (10), which are sequentially connected in series via pipelines.

5. The high-speed railway overhead line ice coating real-type simulation device according to claim 4 is characterized in that: The spray assembly (2) comprises a water delivery pipe (11) connected to a pipe of a cold water supply unit, and an adjustable nozzle (12) connected to the water delivery pipe (11) and located above the contact network.

6. The high-speed railway overhead line ice coating real-type simulation device according to claim 5 is characterized in that: A plurality of distributed optical fiber sensors are arranged at intervals on the contact line surface of the true contact network module, and the distributed optical fiber sensors are connected to a high-speed image acquisition device (13).

7. The high-speed railway overhead line ice coating real-type simulation device according to claim 5 is characterized in that: The dehumidification unit (4) adopts a rotary dehumidifier.

8. The high-speed railway overhead line ice coating real-type simulation device according to claim 5 is characterized in that: The humidifying unit (5) adopts an ultrasonic humidifier.

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