Supersonic Nozzle Optimization Design with Spline Curves Fitting the Nozzle Profiles Shenghao Wu, Daxiong Liao, Jiming Chen, Qin Chen and Haitao Pei JNWPU, 36 4 (2018) 785-791 Published online: 24 October 2018 DOI: 10.1051/jnwpu/20183640785