CN-122025363-A - Electromagnetic coil emitter nitrogen cooling system and method

Abstract

The application relates to the technical field of electromagnetic coil emission, and particularly discloses a nitrogen cooling system and a nitrogen cooling method for an electromagnetic coil emitter. The method comprises the steps of firstly establishing a quantitative calculation model of emission working conditions and cooling power based on an energy conservation principle and pre-storing the quantitative calculation model in a control system, inquiring the model based on task parameters before emission, pre-adjusting the running state of a nitrogen cooling device through a feedforward control strategy, and carrying out negative feedback adjustment by combining real-time temperature data during emission. The high-efficiency cooling of the coil is carried out by adjusting the liquid nitrogen release rate, the compressed air flow and the outlet end flow of the gas mixing device, controlling the flow and the temperature of cooling gas so as to adjust the cooling capacity and arranging a cooling air passage at the coil. The application combines feedforward and negative feedback control, realizes accurate active cooling of electromagnetic emission pulse thermal shock, and can meet the requirement of rapid cooling of the coil under the continuous emission working condition of the emitter.

Inventors

• ZHANG YADONG
• HU YIRAN

Assignees

• 武汉大学

Dates

Publication Date

20260512

Application Date

20260205

Claims (10)

1. 1. A nitrogen cooling method for an electromagnetic coil emitter is characterized by comprising the following steps: Modeling and presetting, namely establishing a corresponding relation model of the emission working condition and the cooling power target value through multi-physical-field simulation, and presetting the corresponding relation model in a control system; Temperature monitoring, namely acquiring real-time temperature data of a coil through a temperature sensor in the coil; The real-time cooling power is determined by combining the real-time temperature data of the coil and the corresponding relation model by the control system; The cooling control comprises the steps of inquiring the corresponding relation model according to the parameters of the emission task before each emission task and pre-adjusting the operation parameters of the nitrogen cooling device to a target state; The nitrogen cooling device mixes the compressed air and the liquid nitrogen in the gas mixing device to obtain cooling gas, the coil is cooled through a cooling air passage arranged outside or inside the coil, and the flow and the temperature of the cooling gas are controlled by adjusting the release rate of the liquid nitrogen, the flow of the compressed air and the flow of the outlet end of the gas mixing device, so that the cooling capacity is adjusted.
2. 2. The method for cooling the electromagnetic coil transmitter by nitrogen according to claim 1, wherein in the modeling and presetting steps, the multi-physical-field simulation comprises the steps of adopting an electromagnetic-temperature-stress multi-physical-field coupling method, calculating joule heat generated by coils of each level of the transmitter according to preset transmitting kinetic energy and continuous transmitting speed, substituting the joule heat as a heat source into a simulation model, setting initial conditions such as temperature, flow and the like of cooling gas based on the structure and material parameters of the coils, carrying out simulation calculation, obtaining the space-time distribution characteristics of temperature fields of the coil transmitter under different cooling modes and different transmitting working conditions, and determining cooling gas flow control parameters for realizing the cooling power target values.
3. 3. The method of nitrogen cooling an electromagnetic coil according to claim 2, wherein the Joule heat Q i generated by the ith coil of the coil emitter is: Wherein i (t) i is the time-varying current of the ith coil under each working condition, R i is the resistance of the ith coil, and t i is the duration of the ith current.
4. 4. A method for nitrogen cooling of a magnetic coil emitter according to claim 3, wherein the cooling gas flow V satisfies the following rule: wherein Q is the Joule heat generated by all coils, T target is the coil safety threshold temperature, T in is the inlet temperature of the cooling gas, C p is the specific heat capacity of the cooling gas, For the coil temperature change rate, α, β are correction coefficients determined by simulation based on the coil specific heat capacity and the thermal conductivity.
5. 5. A method for cooling an electromagnetic coil transmitter by nitrogen as recited in claim 2, wherein determining the cooling gas flow control parameters for achieving the cooling power target values comprises establishing a mapping agent model relationship among the coil transmitter hot spot, the cooling gas initial temperature and the cooling gas flow under different working conditions according to the coil transmitter temperature time-space distribution characteristics obtained by multi-physical field simulation, optimizing the cooling gas initial temperature and the cooling gas flow under different emission working conditions by limiting coil test temperatures, and achieving thermal management through minimum cost.
6. 6. The method for cooling the electromagnetic coil transmitter by nitrogen according to claim 1, wherein in the temperature monitoring step, a highest temperature value of the transmitter is obtained by calculation according to multi-physical field coupling, a plurality of positions inside a flange plate of the transmitter or outside the transmitter are selected as temperature measuring points, a temperature corresponding relation between the positions of the measuring points and the positions of the highest temperature value is established, temperature measuring point screening is carried out by adopting a machine learning method, and a minimum measuring point is determined and a temperature sensor is additionally arranged as an automatic regulation reference condition.
7. 7. The method of claim 1, wherein the step of controlling the cooling comprises automatically adjusting the liquid nitrogen release rate, the compressed air flow rate and the outlet end flow rate of the gas mixing device synchronously according to the required real-time cooling power by the control system.
8. 8. The method of claim 7, wherein the automatic adjustment is further combined with a negative feedback control mode, and the negative feedback adjustment can be performed on the operation parameters of the nitrogen cooling device according to real-time temperature data fed back by the temperature sensor.
9. 9. A method of cooling a solenoid valve according to claim 7 wherein the adjustment in the cooling control step supports a manual adjustment mode, wherein in the event of failure of the automatic adjustment, the cooling scheme settings for different emission conditions can be queried prior to emission, the compressed air flow rate can be manually adjusted, the liquid nitrogen release rate can be manually adjusted, and the gas mixing device outlet flow rate can be manually adjusted.
10. 10. A cooling system for carrying out the method for nitrogen cooling of an electromagnetic coil transmitter according to any one of claims 1 to 9, characterized by comprising nitrogen cooling means, coil temperature monitoring means and a control system; the nitrogen cooling device comprises a gas compressor, a drying filter, a gas mixing device and a cooling air passage leading to the coil, which are sequentially connected, wherein the gas mixing device is also connected with a liquid nitrogen storage tank; the coil framework is provided with a mounting groove for accommodating a cooling air passage, and cooling gas is released to a flange plate or directly released to a gun barrel to cool the coil; The coil temperature monitoring device comprises a temperature sensor pre-buried in the inner or surface of the coil flange and is used for acquiring real-time temperature data of the coil; the control system is respectively connected with the gas compressor, the gas mixing device, the valve at the outlet end of the liquid nitrogen storage tank and the coil temperature monitoring device, and is internally preset with a corresponding relation model which is established based on multi-physical-field simulation and between different emission working conditions and required cooling power target values, and is configured to execute the following operations: And generating and sending a control instruction according to the real-time cooling power to synchronously adjust the flow of the outlet end of the gas compressor, the liquid nitrogen release rate of the liquid nitrogen storage tank and the flow of the outlet end of the gas mixing device, thereby controlling the flow and the temperature of cooling gas and realizing the adjustment of the cooling capacity.

Description

Electromagnetic coil emitter nitrogen cooling system and method Technical Field The application relates to the technical field of electromagnetic coil emission, in particular to a nitrogen cooling system and method for an electromagnetic coil emitter. Background When the electromagnetic coil transmitter is operating normally, the drive coil generates significant joule heat due to the discharge. In the continuous emission process, heat is continuously accumulated in the coil, if the heat cannot be timely emitted, the phase transition temperature of the insulating material of the coil is reached and exceeded after a plurality of emissions, irreversible damage of the coil structure is caused, and even insulation failure or emitter damage is caused. Therefore, performing thermal management on the drive coil is critical to ensure continuous, stable operation of the electromagnetic coil transmitter. At present, common electromagnetic coil thermal management modes mainly comprise forced air cooling and water cooling. Forced air cooling improves the convection heat transfer coefficient by enhancing air flow, can delay the temperature rise of the coil to a certain extent, but has limited heat radiation capacity, and especially for a solid insulated electromagnetic coil emitter with compact structure and high power density, the internal space is narrow, heat accumulation is serious, the continuous heat radiation requirement is difficult to be met by forced air cooling, and the temperature rise problem is still outstanding. Although the water cooling mode can provide larger cooling power, the cooling requirement of continuous emission of the high-power electromagnetic coil is still difficult to meet because the temperature of the working medium is only 0 ℃ at the lowest. In addition, the special requirements under the electromagnetic emission environment, such as real-time controllability, response speed, active protection of the coil insulation state and the like, are not fully considered in the two modes, so that the application is limited in the continuous emission scene with actual high power and high frequency. Disclosure of Invention In order to overcome the defects in the prior art, the application provides a nitrogen cooling system and a nitrogen cooling method for an electromagnetic coil emitter. The application provides a nitrogen cooling method for an electromagnetic coil transmitter, which adopts the following technical scheme: a method of nitrogen cooling a solenoid emitter comprising the steps of: Modeling and presetting, namely establishing a corresponding relation model of the emission working condition and the cooling power target value through multi-physical-field simulation, and presetting the corresponding relation model in a control system; Temperature monitoring, namely acquiring real-time temperature data of a coil through a temperature sensor in the coil; The real-time cooling power is determined by combining the real-time temperature data of the coil and the corresponding relation model by the control system; The cooling control comprises the steps of inquiring the corresponding relation model according to the parameters of the emission task before each emission task and pre-adjusting the operation parameters of the nitrogen cooling device to a target state; The nitrogen cooling device mixes the compressed air and the liquid nitrogen in the gas mixing device to obtain cooling gas, the coil is cooled through a cooling air passage arranged outside or inside the coil, and the flow and the temperature of the cooling gas are controlled by adjusting the release rate of the liquid nitrogen, the flow of the compressed air and the flow of the outlet end of the gas mixing device, so that the cooling capacity is adjusted. Further, in the modeling and presetting steps, the multi-physical field simulation comprises the steps of adopting an electromagnetic-temperature-stress multi-physical field coupling method, calculating Joule heat generated by coils at each level of a transmitter according to preset transmission kinetic energy and continuous transmission rate, substituting the Joule heat as a heat source into a simulation model, setting initial conditions such as temperature, flow and the like of cooling gas based on the structure and material parameters of the coils, carrying out simulation calculation, obtaining space-time distribution characteristics of temperature fields of the transmitter of the coils under different cooling modes and different transmission working conditions, and determining cooling gas flow control parameters for realizing the cooling power target values. Further, at different emission kinetic energies and continuous emission rates, joule heat Q i generated by the ith stage coil of the coil emitter is: Wherein i (t) i is the time-varying current of the ith coil under each working condition, R i is the resistance of the ith coil, and t i is the duration of the ith current. Further