[1] Liao Jianhong, Meng Hongyun, Wang Hongwei et al.. Investigation and applications of fiber laser precision cutting system[J].Chinese J. Lasers,2007,34(1): 135～138

[2] Hong Lei, Mi Chenglong, Liu Dejin. Laser cutting special steel sheet controlled by rotating gas flow[J]. Chinese J. Lasers,2007,34(4): 543～548

[3] H. C.Man, J. Duan, T. M.Yue. Behavior of supersonic and subsonic gas jets inside laser cut kerfs[C]. Section B-ICALEO, 1997,83:27～36

[4] I.M. Hall. Transonic flow in two-dimensional and axially-symmetric nozzles[J]. The Quarterly Journal of Mechanics and Applied Mathematics, 1962, 15(4): 487～508

[5] K. Foelsch. The analytical design of axially symmetric laval nozzle for a parallel and uniform jet[J]. Journal Aerospace Sciences, 1994, 16(3):161～166

[6] W. T. Lord. A theoretical study of annular supersonic nozzles[J]. Aeronautical Research Council Reposrts and Memoranda, 1961, 3227:1～30

[7] H. C. Man, J.Duan, T.M.Yue. Design and characteristic analysis of supersonic nozzles for high gas pressure laser cutting[J]. Journal of Material Processing Technology, 1997, 63(1～3) : 217～222

[8] B.A. Ward. Supersonic characteristics of nozzles used with laser for cutting [J]. Laser Instiute of America,1985,43(1):94～101

[9] R.Edler，P.Berger.New nozzle concept for cutting with high power lasers[C]. Proc. of the Laser Materials Processing Symposium ICALEO’91,1992,74:253～262

[10] Liu Jianhua, Chen Yijian, Duan Jun. Design of supersonic nozzles for laser cutting[J]. Laser Technology,2000,24(1): 46～49

[11] Chen Yijian,Liu Jianhua,Hu Xiyuan. Summary of laser cutting nozzles and analysis of flow field[J]. Aerospace Materials & Technology,1999,36(2): 17～20

[12] J.Iwamoto. Impingement of under-expanded jets on a flat plate[J].Journal of Fluids Engineering, 1990,112(7): 179～184

[13] H. Katanoda, Y. Miyazato, M. Masuda et al.. Pitot pressure of correctly-expanded and underexpanded free jets from axisymmetric supersonic nozzles[J]. Shock Waves, 2000,10(2): 95～101