Research On Function Expansion And Hybrid Energy Storage System Of Reconnection Electromagnetic Launcher

Electromagnetic launch technology has been widely used in military,aerospace and other fields due to its advantages of high launch speed,high energy conversion efficiency and good controllability.Of which,the reconnection electromagnetic launcher(REL)not only overcomes the friction and ablation defects of railgun,but also has the potential to launch large mass projectile,so it has a good application prospect.Improving the energy conversion efficiency is the key research problem of electromagnetic launcher technology.Because of the numerous and interrelated factors,the research on improving the energy conversion efficiency is still very difficult.Secondly,improving the ability to launch different types of backpack is also the key issue of the electromagnetic launch technology research,so the research on launching different mass and size loads with high energy conversion efficiency still needs to be further studied based on a set of launcher.Besides,the synchronous induction electromagnetic launcher still has the problems of inadequate energy utilization and low energy density of energy storage elements,designing a hybrid energy storage system with high energy density and high power density to realize rapid repeated charging and residual energy recovery for pulse power supply will help to promote the practical development of electromagnetic launchers.In this paper,the function expansion of REL and a hybrid energy storage system which can be applied to synchronous induction electromagnetic launcher are studied.The main work can be summarized as follows:(1)A reconfigurable reconnection electromagnetic launcher(RREL)is proposed.For the task of launching different mass loads within the limits of the driving coil current amplitude and the projectile acceleration amplitude,on the one hand,the reconfigurable operation of the driving coil combined with the initial voltage regulation of the pulse capacitor can achieve good waveform matching,so that the launch process of the loads with different mass can achieve a high energy conversion efficiency;on the other hand,the reconfigurable operation of the pulse capacitor can effectively reduce the withstand voltage level of the device without reducing the energy conversion efficiency.In addition,under the same pulse power supply parameters,the RREL can carry a small mass load with an aluminum alloy armature to achieve a relatively high speed launching,the copper alloy armature can be used to carry a large mass load realizing a relatively high energy conversion efficiency launching.(2)Study the characteristics of multi-coil reconnection electromagnetic launcher(MCREL).The launch performances and mechanical characteristics of the MCREL are simulated based on the principle of “the current waveform of the driving coils are consistent,and the projectile mass is consistent with the initial energy storage ratio when no-load”,the results show that the energy conversion efficiency of the MCREL increases with the continuous expansion of the model structure and tends to a stable value gradually,but the mechanical properties of the model gradually deteriorate.Finally,it is concluded that the three-coil reconnection electromagnetic launcher(TCREL)has relatively good launch performance and mechanical characteristic,it has equivalent referenced value in application.(3)Taking the TCREL as the basic module,multiple basic modules are symmetrically arranged along the circumferential direction,and finally the toroidal reconnection electromagnetic launcher(TREL)is obtained.The launch performances and mechanical characteristics of the TREL are simulated,the results show that under the “traditional armature+ synchronous discharge” mode,the switching timing control is relatively simple,further,the TREL has high energy conversion efficiency and better mechanical property.But in the launch mode of “improved armature + asynchronous discharge”,the TREL not only has high energy conversion efficiency,but also the fluctuation of projectile acceleration curve is smooth,which is conducive to the launch of the projectile with electronic devices.(4)A high temperature superconducting magnet—battery hybrid energy storage system is proposed.The new hybrid energy storage system can not only meet the demand of electromagnetic launchers for short time high-power repetitive charging,but also achieve residual energy recovery,which improves the overall energy conversion efficiency under continuous launch conditions.In addition,the new hybrid energy storage system can realize the energy exchange with power system.When there is no launch mission requirement,it can connect the grid and adjust the power fluctuation of the power system;When launching mission requirements,it is disconnected from the grid and can independently complete the charging process and residual energy recovery process of the pulse capacitor,so,the hybrid energy storage system has high flexibility.Finally,part of the above research work is verified by experiments,and the experimental results verify the feasibility of the new structure REL.The research results of this paper provide some guidance for the practical application of the REL.