volume | PIER Journals

Abstract

Electromagnetic thermal performance is critical during electromagnetic launch. However, due to the harsh in-bore environment, it is difficult to obtain multi-parameter information by means of experimental measurement, which further limits our understanding of the field distribution of electromagnetic launcher. In this paper, considering the temperature dependence of material conductivity and armature solid-liquid isothermal phase transition, a bidirectional coupling model of electro-magnetic-thermal field of multi-turn electromagnetic rail launcher is established. The reliability of this model is verified by comparing the calculation results of the same model and input conditions with the numerical tool EMAP3D, as well as the related experimental comparison. In addition, the multi-turn and traditional EMRLs are compared and analyzed. The results show that compared to single-turn EMRL, the armatures have greater driving force in two multi-turn configurations, and the impulse lifting rates are about 1/2. In the multi-turn configurations, the lateral resultant forces of the two armatures are not zero, while the lateral force difference in the integrated negative rail configuration is relatively small. The ablation of the armature in the integrated negative rail configuration is less severe.

1. Hundertmark, S., G. Vincent, F. Schubert, and J. Urban, "The NGL-60 railgun," IEEE Transactions on Plasma Science, Vol. 47, No. 7, 3327-3330, Jul. 2019.
doi:10.1109/TPS.2019.2921099

2. Fair, H. D., "The science and technology of electric launch," IEEE Transactions on Magnetics, Vol. 37, No. 1, 25-32, Jan. 2001.
doi:10.1109/20.911783

3. Zhang, B., Y. Kou, K. Jin, and X. Zheng, "A multi-field coupling model for the magnetic-thermal-structural analysis in the electromagnetic rail launch," Journal of Magnetism and Magnetic Materials, Vol. 519, 167495, Feb. 2021.
doi:10.1016/j.jmmm.2020.167495

4. Angeli, M. and E. Cardelli, "Electro-thermal behavior of solid armatures," IEEE Transactions on Magnetics, Vol. 35, No. 1, 47-52, Jan. 1999.
doi:10.1109/20.738374

5. Sun, Jian, Junsheng Cheng, Qiuliang Wang, Ling Xiong, Yuantao Cong, and Yichen Wang, "Numerical simulation of melt-wave erosion in 2-D solid armature," IEEE Transactions on Plasma Science, Vol. 50, No. 4, 1032-1039, Apr. 2022.
doi:10.1109/TPS.2022.3158526

6. Li, Shizhong, Jun Li, Shengguo Xia, Qingxia Zhang, and Peizhu Liu, "Phase division and critical point definition of electromagnetic railgun sliding contact state," IEEE Transactions on Plasma Science, Vol. 47, No. 5, 2399-2403, May 2019.
doi:10.1109/TPS.2019.2891175

7. Bayati, Mohammad Sajjad and Asghar Keshtkar, "Novel study of the rail's geometry in the electromagnetic launcher," IEEE Transactions on Plasma Science, Vol. 43, No. 5, 1652-1656, May 2015.
doi:10.1109/TPS.2015.2417532

8. Sun, Jian, Junsheng Cheng, Qiuliang Wang, Ling Xiong, Yuantao Cong, and Yichen Wang, "Research on arc suppression parameter matching of augmented electromagnetic launcher," IEEE Transactions on Plasma Science, Vol. 49, No. 12, 3988-3993, Dec. 2021.
doi:10.1109/TPS.2021.3125045

9. Bayati, M. Sajjad, Asghar Keshtkar, and Ahmad Keshtkar, "Transition study of current distribution and maximum current density in railgun by 3-D FEM-IEM," IEEE Transactions on Plasma Science, Vol. 39, No. 1, 13-17, Jan. 2011.
doi:10.1109/TPS.2010.2063040

10. Bayati, M. Sajjad, Asghar Keshtkar, and Ahmad Keshtkar, "Thermal computation in railgun by hybrid time domain technique 3-D-FEM-IEM," IEEE Transactions on Plasma Science, Vol. 39, No. 1, 18-21, Jan. 2011.
doi:10.1109/TPS.2010.2070847

11. Pang, Zhanzhong, Housheng Wang, Hui Wang, and Li Zhang, "Analysis of current and magnetic field distributions in rail launcher with peaceman-rachford finite-difference method," IEEE Transactions on Plasma Science, Vol. 40, No. 10, 2717-2722, Oct. 2012.
doi:10.1109/TPS.2012.2211083

12. Gong, Fei and Chunsheng Weng, "3-D numerical study of meltwave erosion in solid armature railgun," High Voltage Engineering, Vol. 40, No. 7, 2245-2250, 2014.

13. Hsieh, K., "A lagrangian formulation for mechanically, thermally coupled electromagnetic diffusive processes with moving conductors," IEEE Transactions on Magnetics, Vol. 31, No. 1, 604-609, Jan. 1995.
doi:10.1109/20.364626

14. Shatoff, H., D. A. Pearson, and A. E. Kull, "Simulation of dynamic armature motion in a railgun with coupling of electromagnetic, thermal and structural effects using shifted finite element fields," 2005 IEEE Pulsed Power Conference, 253-256, 2005.

15. Lin, Qing-Hua and Bao-Ming Li, "Numerical simulation of interior ballistic process of railgun based on the multi-field coupled model," Defence Technology, Vol. 12, No. 2, 101-105, Apr. 2016.
doi:10.1016/j.dt.2015.12.008

16. Bayati, M. Sajjad, Asghar Keshtkar, and S. V. Al-Din Makki, "Analyzing the current distribution, magnetic field and inductance gradient at the circular rail in comparison to rectangular rail," 2012 16th International Symposium on Electromagnetic Launch Technology, 1-5, Beijing, China, May 2012.

17. Stefani, F., R. Merrill, and T. Watt, "Numerical modeling of melt-wave erosion in two-dimensional block armatures," IEEE Transactions on Magnetics, Vol. 41, No. 1, 437-441, Jan. 2005.
doi:10.1109/TMAG.2004.838758

Dr. Jian Sun

Dr. Ling Xiong

Dr. Yuantao Cong

Dr. Junsheng Cheng