Cold and hot load dredging method and device for low-vacuum pipeline high-speed train and medium

Abstract

The invention discloses a cold and hot load dredging method and device for a low-vacuum-pipeline high-speed train and a medium, and the method comprises the steps: S1, constructing a geometric configuration of a low-vacuum-pipeline high-speed train transportation system, and obtaining vehicle body model parameters of the train; s2, acquiring system low vacuum environment data and operation speed data based on the current geometric configuration; s3, calculating a spatial wave system structure and heat flow distribution, identifying and obtaining spatial choking features, and judging the applicability of the periodic cold and hot load dredging design; s4, according to heat flow distribution in the train body bus direction of the train, the periodic cold and hot load acting position is determined; and S5, a micro-channel dredging unit is designed and established according to the thermal load position, and periodic cold and hot load dredging is achieved. According to the invention, the heat of the high-speed train transportation system based on the low-vacuum pipeline is directionally transported from a local high-heat load area to a local low-heat load area, and cold and hot load dredging in a skin cycle is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal protection in low-vacuum high-speed rail transportation, and in particular to a method, equipment and medium for conducting cold and hot loads of a low-vacuum pipeline high-speed train. Background Art

[0002] Higher operating speed is the goal pursued by high-speed trains. At present, the speed of high-speed maglev trains can reach 600km / h, which has almost reached the upper limit of operation. Current research uses a low-vacuum (100-10000Pa) pipeline closed system to operate high-speed maglev trains, which is expected to increase the operating speed to more than 1000km / h, making it possible to run trains at higher speeds. However, the study found that under such extremely high-speed operating conditions, high-speed trains located in low-vacuum pipelines present new service environment characteristics that traditional high-speed trains do not have, such as narrow space, complex wave systems, and obvious aerodynamic thermal effects. Because the surface skin of the train body is subjected to periodic cold and hot loads under non-congested conditions, there are thermal safety hazards such as inducing local thermal over-limit and non-uniform thermal deformation of the skin structure. Skin thermal protection is a problem currently faced by low-vacuum pipeline high-speed trains. Summary of the invention

[0003] To solve the above problems, the present invention provides a method, equipment and medium for conducting cold and hot loads of a low-vacuum pipeline high-speed train. According to the basic theory of compressible flow and based on the law that a periodic wave system structure is formed between the high-speed train and the low-vacuum pipeline under non-congested conditions and periodic cold and hot loads are generated, a liquid working medium transport channel with a certain high thermal conductivity is arranged through the principle of structural conduction thermal protection to achieve directional transport of heat from local high heat load areas to local low heat load areas, thereby achieving periodic cold and hot load conduction of the skin.

[0004] The present invention provides a method for guiding cold and hot loads of a low vacuum pipeline high-speed train, and the specific technical scheme is as follows:

[0005] S1: Construct the geometric configuration of the low vacuum pipeline high-speed train transportation system and obtain the body model parameters of the train;

[0006] S2: Based on the currently constructed geometric configuration, obtain the low vacuum environment data and running speed data of the low vacuum pipeline high-speed train transportation system;

[0007] S3: Calculate the spatial wave system structure and heat flow distribution of the low vacuum pipeline high-speed train transportation system, obtain the spatial congestion characteristics based on the spatial wave system structure identification, and judge the applicability of the periodic cold and hot load relief design according to the spatial congestion characteristics. If the applicability conditions are met, execute the next step;

[0008] S4: Determine the position of periodic hot and cold loads according to the heat flux distribution in the direction of the train body busbar;

[0009] S5: Design the length of the microchannel drainage unit according to the position of the heat load, establish the microchannel drainage unit, and realize the drainage of periodic cold and hot loads. The microchannel drainage unit is filled with a heat-conducting liquid working medium.

[0010] Further, in step S1, the geometric configuration is as follows:

[0011] The radius of the inner wall of the low vacuum pipeline is R T The train has an infinitely long ring structure; the train has a three-dimensional axisymmetric geometric configuration with a parabolic nose, and the train includes a head, a body and a tail.

[0012] Furthermore, the body model parameters include the train head length L n , Body length L f , tail length L r , body radius R tr and blocking ratio

[0013] Furthermore, the low vacuum environment data includes the vacuum degree p in the pipeline, the quiet environment temperature T and the corresponding quiet environment sound speed The operating speed data includes an operating speed U0 and a corresponding operating Mach number M0=aU0.

[0014] Furthermore, the heat flux distribution data is extracted when the train body is under cold wall conditions.

[0015] Furthermore, the length of the microchannel drainage unit is calculated as follows:

[0016]

[0017] Where n represents the number of times the vehicle body is subjected to periodic hot and cold loads, s h,i It represents the high point position of aerodynamic load along the generatrix of train body with stagnation point as zero point, i.e. the position of thermal load, i=1,2,3...,n.

[0018] Furthermore, after step S5, the method further includes:

[0019] S6: A temperature-sensitive switch device is arranged at the hot end of the microchannel drainage unit based on a temperature sensor, and the circulation flow rate of the liquid working medium in the microchannel drainage unit is adaptively controlled according to the temperature detected at the hot end of the microchannel drainage unit.

[0020] Furthermore, the circulation flow of the liquid working medium in the microchannel drainage unit is adaptively controlled by an adaptive adjustment control function, and the adaptive adjustment control function is expressed as follows:

[0021]

[0022] in, represents the maximum working flow of the microchannel drainage unit, T cr Indicates the trigger temperature of the temperature-sensitive switch device, T sup Upper service temperature limit.

[0023] The present invention provides a cold and hot load evacuation device for a low-vacuum pipeline high-speed train. The cold and hot load evacuation device for the low-vacuum pipeline high-speed train comprises: a memory, a processor, and a cold and hot load evacuation program for the low-vacuum pipeline high-speed train stored in the memory and executable on the processor. When the cold and hot load evacuation program for the low-vacuum pipeline high-speed train is executed by the processor, the steps of the cold and hot load evacuation method for the low-vacuum pipeline high-speed train are implemented.

[0024] The present invention also provides a computer storage medium, on which is stored a cold and hot load evacuation program for a low-vacuum pipeline high-speed train. When the cold and hot load evacuation program for the low-vacuum pipeline high-speed train is executed by a processor, the steps of the cold and hot load evacuation method for the low-vacuum pipeline high-speed train are implemented.

[0025] The beneficial effects of the present invention are as follows:

[0026] The geometric configuration of the low-vacuum pipeline high-speed train transportation system constructed by the present invention is to provide a self-circulating microchannel drainage unit with a high thermal conductivity liquid working medium and a local annular structure, and to provide a temperature-sensitive switch device for adaptive flow adjustment. Active drainage measures are adopted to alleviate the adverse effects such as local thermal over-limit and non-uniform thermal deformation of the skin structure caused by the non-uniform action of periodic cold and hot loads on the surface skin of the train body under non-congestion conditions, so as to achieve active adaptive adjustment and control of local non-uniform loads, effectively reduce the local high thermal load on the body skin of the low-vacuum pipeline high-speed train, and realize effective thermal protection of the body of the low-vacuum pipeline high-speed train by realizing efficient heat exchange of cold and hot loads. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall process of the method of the present invention.

[0028] Figure 2 It is a schematic diagram illustrating the cold and hot load drainage of the microchannel drainage unit of the present invention. DETAILED DESCRIPTION

[0029] The following description clearly and completely describes the technical solutions 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. Based on the embodiments of 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.

[0030] In the description of the embodiments of the present invention, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the invention product is usually placed when in use, or the orientation or positional relationship commonly understood by those skilled in the art, or the orientation or positional relationship in which the invention product is usually placed when in use, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0031] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Example 1

[0033] Embodiment 1 of the present invention discloses a method for guiding cold and hot loads of a low vacuum pipeline high-speed train, such as Figure 1 As shown, the details are as follows:

[0034] S1: Construct the geometric configuration of the low vacuum pipeline high-speed train transportation system and obtain the body model parameters of the train.

[0035] In this embodiment, the geometric configuration is as follows:

[0036] The radius of the inner wall of the low vacuum pipeline is R T An infinitely long ring structure, running a high-speed train on the centerline of a low-vacuum tube;

[0037] The train has a three-dimensional axisymmetric geometric configuration with a parabolic nose, and the train includes a head, a body and a tail.

[0038] The total length of the train is L tr , the head length of the train is L n , body length is L f , the tail length is L r ;

[0039] Specifically, L f >L n , L f >L r , L tr =L n +L f +L r ;

[0040] The radius of the train body is R tr , R tr <R T ;

[0041] The blocking ratio is defined as:

[0042] S2: Based on the current geometric configuration, obtain the low vacuum environment data and running speed data of the low vacuum pipeline high-speed train transportation system;

[0043] The low vacuum environment data include the vacuum degree in the pipeline p (p<1atm), the quiet environment temperature T, and the corresponding quiet environment sound speed

[0044] The operating speed data includes the operating speed U0 and the corresponding operating Mach number M0=aU0; specifically, the general design Mach number is 0.5 <M0<2.0。

[0045] S3: Calculate the spatial wave system structure and heat flow distribution of the low vacuum pipeline high-speed train transportation system, obtain the spatial congestion characteristics based on the spatial wave system structure identification, and judge the applicability of the periodic cold and hot load relief design according to the spatial congestion characteristics. If the applicability conditions are met, execute the next step.

[0046] Under the above operating Mach number range conditions, the apparent blockage ratio r b The situation may cause a certain degree of flow congestion;

[0047] Specifically, in this embodiment, the compressible flow field of the system is obtained through CFD simulation of a high-speed train in a low vacuum pipeline, and the spatial wave system structure around the vehicle body is distinguished from the flow field;

[0048] Then, the spatial congestion characteristics are identified. If the flow field around the vehicle body is congested, the applicability of the periodic cold and hot load diversion design does not meet the standard; if the flow field around the vehicle body is not congested, but the periodic characteristics are not significant (the vehicle body is short or the congestion is relatively small), the applicability of the periodic cold and hot load diversion design does not meet the standard; if the flow field around the vehicle body is not congested, but the periodic characteristics are significant, the applicability of the periodic cold and hot load diversion design meets the standard; if the applicability does not meet the standard, stop the current operation;

[0049] At the same time, based on CFD data, the surface heat flux distribution data of the train body under cold wall conditions (such as 300K) can be extracted.

[0050] S4: Determine the position of periodic hot and cold loads according to the heat flux distribution in the direction of the train body busbar;

[0051] The periodic hot and cold load action positions include the aerodynamic load high point (thermal load) position s h,i , aerodynamic load low point (cold load) position s c,i .

[0052] S5: Design the length of the microchannel drainage unit according to the position of the heat load, establish the microchannel drainage unit, and realize the drainage of periodic cold and hot loads. The microchannel drainage unit is filled with a heat-conducting liquid working medium.

[0053] like Figure 2 As shown, the diversion unit can be designed as a self-circulating microchannel with a local annular structure. By establishing a microchannel diversion unit, the concentrated heat in the local heat load area can be diverted to the upstream and downstream local cold load areas, so that the train body structure and even the inner surface of the car can be evenly heated.

[0054] In this embodiment, the length of the microchannel drainage unit is designed and calculated as follows:

[0055]

[0056] Where n represents the number of times the vehicle body is subjected to periodic hot and cold loads, s h,i It represents the high point position of aerodynamic load along the generatrix of train body with stagnation point as zero point, i.e. the position of thermal load, i=1,2,3...,n.

[0057] In this embodiment, it also includes S6: a temperature-sensitive switch device based on a temperature sensor is arranged at the hot end of the microchannel drainage unit, that is, the high point of the aerodynamic load (thermal load), and the circulation flow rate of the liquid working medium in the microchannel drainage unit is adaptively controlled according to the temperature felt by the hot end of the microchannel drainage unit.

[0058] In this embodiment, the surface heat flux distribution of the train body under cold wall conditions (such as 300K) is used as the boundary condition, and the correction factors under hot wall conditions are considered to carry out heat and mass transfer simulation of the body "protection structure + drainage unit" configuration, obtain the temperature distribution inside and outside the body after adding drainage measures, and evaluate the drainage thermal protection effect.

[0059] In this embodiment, the circulation flow rate of the liquid working medium in the microchannel drainage unit is adaptively controlled by an adaptive adjustment control function, and the adaptive adjustment control function is expressed as follows:

[0060]

[0061] in, represents the maximum working flow of the microchannel drainage unit, T cr Indicates the trigger temperature of the temperature-sensitive switch device, T sup Upper service temperature limit;

[0062] When T <T cr When T <T cr <T sup When T>T sup When the drainage unit reaches the maximum working flow, the drainage efficiency of cold and hot loads will be limited.

[0063] In practice, for the body structure of a specific high-speed train, design guidance is carried out based on the periodic cold and hot load guidance method of the body skin of the above-mentioned train, which can realize the mapping and preparation of such a guidance type thermal protection system, forming a guidance type thermal protection system that can alleviate the hidden dangers of local thermal over-limit and non-uniform thermal deformation caused by local periodic cold and hot loads.

[0064] Example 2

[0065] Embodiment 2 of the present invention discloses a cold and hot load evacuation device for a low vacuum pipeline high-speed train, and the device may be a user equipment (UE), such as a mobile phone, a smart phone, a laptop, a digital broadcast receiver, a personal digital assistant (PDA), a tablet computer (PAD), a handheld device, a vehicle-mounted device, a wearable device, a computing device or other processing device connected to a wireless modem, a mobile station (MS), etc., for performing a cold and hot load evacuation method for a low vacuum pipeline high-speed train. The device may be called a user terminal, a portable terminal, a desktop terminal, etc.

[0066] Typically, the device includes: at least one processor, a memory, and a cold and hot load evacuation program for a low-vacuum tube high-speed train stored in the memory and executable on the processor, wherein the cold and hot load evacuation program for the low-vacuum tube high-speed train is configured to implement the steps of the cold and hot load evacuation method for a low-vacuum tube high-speed train as described in Example 1.

[0067] The processor may include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The processor may be implemented in at least one hardware form of DSP (Digital Signal Processing), FPGA (Field-Programmable Gate Array), and PLA (Programmable Logic Array). The processor may also include a main processor and a coprocessor. The main processor is a processor for processing data in the awake state, also known as a CPU (Central Processing Unit); the coprocessor is a low-power processor for processing data in the standby state. In some embodiments, the processor may be integrated with a GPU (Graphics Processing Unit), which is responsible for rendering and drawing the content to be displayed on the display screen. The processor may also include an AI (Artificial Intelligence) processor, which is used to process the calculation operations of the cold and hot load evacuation program of the low-vacuum pipeline high-speed train, so that the cold and hot load evacuation method of the low-vacuum pipeline high-speed train can be trained and learned autonomously to improve efficiency and accuracy.

[0068] The memory may include one or more computer-readable storage media, which may be non-transitory. The memory may also include a high-speed random access memory, and a non-volatile memory, such as one or more disk storage devices, flash memory storage devices. In some embodiments, the non-transitory computer-readable storage medium in the memory is used to store at least one instruction, which is used to be executed by the processor to implement the cold and hot load evacuation method of the low vacuum pipeline high-speed train described in method embodiment 1 of the present application.

[0069] In some embodiments, the terminal may also optionally include: a communication interface and at least one peripheral device. The processor, the memory and the communication interface may be connected via a bus or a signal line. Each peripheral device may be connected to the communication interface via a bus, a signal line or a circuit board. Specifically, the peripheral device includes: at least one of a radio frequency circuit, a display screen and a power supply.

[0070] The communication interface can be used to connect at least one peripheral device related to I / O (Input / Output) to the processor and the memory. The communication interface is used to receive the movement trajectories and other data of multiple mobile terminals uploaded by users through the peripheral device. In some embodiments, the processor, memory and communication interface are integrated on the same chip or circuit board; in some other embodiments, any one or two of the processor, memory and communication interface can be implemented on a separate chip or circuit board, which is not limited in this embodiment.

[0071] The radio frequency circuit is used to receive and transmit RF (Radio Frequency) signals, also known as electromagnetic signals. The radio frequency circuit communicates with the communication network and other communication devices through electromagnetic signals, so that the movement trajectory and other data of multiple mobile terminals can be obtained. The radio frequency circuit converts the electrical signal into an electromagnetic signal for transmission, or converts the received electromagnetic signal into an electrical signal. Optionally, the radio frequency circuit includes: an antenna system, an RF transceiver, one or more amplifiers, a tuner, an oscillator, a digital signal processor, a codec chipset, a user identity module card, etc. The radio frequency circuit can communicate with other terminals through at least one wireless communication protocol. The wireless communication protocol includes but is not limited to: a metropolitan area network, various generations of mobile communication networks (2G, 3G, 4G and 5G), a wireless local area network and / or a WiFi (Wireless Fidelity) network. In some embodiments, the radio frequency circuit may also include circuits related to NFC (Near Field Communication), which is not limited in this application.

[0072] The display screen is used to display the UI (User Interface). The UI may include graphics, text, icons, videos and any combination thereof. When the display screen is a touch display screen, the display screen also has the ability to collect touch signals on the surface or above the surface of the display screen. The touch signal can be input to the processor as a control signal for processing. At this time, the display screen can also be used to provide virtual buttons and / or virtual keyboards, also known as soft buttons and / or soft keyboards. In some embodiments, the display screen can be one, the front panel of the electronic device; in other embodiments, the display screen can be at least two, respectively arranged on different surfaces of the electronic device or in a folding design; in some further embodiments, the display screen can be a flexible display screen, arranged on a curved surface or a folding surface of the electronic device. Even, the display screen can also be set to a non-rectangular irregular shape, that is, a special-shaped screen. The display screen can be made of materials such as LCD (Liquid Crystal Display), OLED (Organic Light-Emitting Diode) and the like.

[0073] The power supply is used to power various components in the electronic device. The power supply can be AC, DC, a disposable battery or a rechargeable battery. When the power supply includes a rechargeable battery, the rechargeable battery can support wired charging or wireless charging. The rechargeable battery can also be used to support fast charging technology.

[0074] Example 3

[0075] An embodiment of the present invention discloses a computer storage medium, on which a cold and hot load evacuation program for a low-vacuum pipeline high-speed train is stored. When the cold and hot load evacuation program for the low-vacuum pipeline high-speed train is executed by a processor, the steps of the cold and hot load evacuation method for the low-vacuum pipeline high-speed train described in the above-mentioned embodiment 1 are implemented.

[0076] The present invention is not limited to the above-mentioned specific embodiments, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. A method for guiding cold and hot loads of a low vacuum pipeline high-speed train, characterized in that: include: S1: Construct the geometric configuration of the low vacuum pipeline high-speed train transportation system and obtain the body model parameters of the train; S2: Based on the current geometric configuration, obtain the low vacuum environment data and running speed data of the low vacuum pipeline high-speed train transportation system; S3: Calculate the spatial wave system structure and heat flow distribution of the low vacuum pipeline high-speed train transportation system, obtain the spatial congestion characteristics based on the spatial wave system structure identification, and judge the applicability of the periodic cold and hot load relief design according to the spatial congestion characteristics. If the applicability conditions are met, execute the next step; S4: Determine the position of periodic hot and cold loads according to the heat flux distribution in the direction of the train body busbar; S5: Design the length of the microchannel drainage unit according to the position of the heat load, establish the microchannel drainage unit, and realize the drainage of periodic cold and hot loads. The microchannel drainage unit is filled with a heat-conducting liquid working medium.

2. The method for guiding cold and hot loads of a low vacuum tube high-speed train according to claim 1, characterized in that: In step S1, the geometric configuration is as follows: The radius of the inner wall of the low vacuum pipeline is R T The train has a three-dimensional axisymmetric geometric configuration with a parabolic nose, and the train includes a head, a body and a tail.

3. The method for guiding cold and hot loads of a low vacuum tube high-speed train according to claim 2, characterized in that: The body model parameters include the train head length L n , Body length L f , tail length L r , body radius R tr and blocking ratio 4. The method for guiding cold and hot loads of a low vacuum tube high-speed train according to claim 1, characterized in that: The low vacuum environment data includes the vacuum degree p in the pipeline, the quiet environment temperature T and the corresponding quiet environment sound speed The operating speed data includes an operating speed U0 and a corresponding operating Mach number M0=aU0.

5. The method for guiding cold and hot loads of a low vacuum tube high-speed train according to claim 1, characterized in that: The heat flux distribution data is extracted when the body of the train is under cold wall conditions.

6. The method for guiding cold and hot loads of a low vacuum tube high-speed train according to claim 1, characterized in that: The length of the microchannel grooming unit is calculated as follows: Where n represents the number of times the vehicle body is subjected to periodic hot and cold loads, s h,i It represents the high point position of aerodynamic load along the generatrix of train body with stagnation point as zero point, i.e. the position of thermal load, i=1,2,3...,n.

7. The method for guiding cold and hot loads of a low vacuum tube high-speed train according to claim 1, characterized in that: After step S5, the method further includes: S6: A temperature-sensitive switch device is arranged at the hot end of the microchannel drainage unit based on a temperature sensor, and the circulation flow rate of the liquid working medium in the microchannel drainage unit is adaptively controlled according to the temperature detected at the hot end of the microchannel drainage unit.

8. The method for guiding cold and hot loads of a low vacuum tube high-speed train according to claim 7, characterized in that: The circulation flow rate of the liquid working medium in the microchannel drainage unit is adaptively controlled by an adaptive adjustment control function, and the adaptive adjustment control function is expressed as follows: in, represents the maximum working flow of the microchannel drainage unit, T cr Indicates the trigger temperature of the temperature-sensitive switch device, T sup Upper service temperature limit.

9. A cold and hot load evacuation device for a low vacuum pipeline high-speed train, characterized in that: The cold and hot load evacuation device of the low-vacuum pipeline high-speed train includes: a memory, a processor, and a cold and hot load evacuation program of the low-vacuum pipeline high-speed train stored in the memory and executable on the processor. When the cold and hot load evacuation program of the low-vacuum pipeline high-speed train is executed by the processor, the steps of the cold and hot load evacuation method of the low-vacuum pipeline high-speed train according to any one of claims 1 to 8 are implemented.

10. A computer storage medium, characterized in that: The computer storage medium stores a cold and hot load evacuation program for a low-vacuum pipeline high-speed train. When the cold and hot load evacuation program for a low-vacuum pipeline high-speed train is executed by a processor, the steps of the cold and hot load evacuation method for a low-vacuum pipeline high-speed train described in any one of claims 1-8 are implemented.

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