Gas Turbine Engine Optimization at Conceptual Designing Andrey Y. Tkachenko, Venedikt S. Kuz’michev, Ilia N. Krupenich and Viktor N. Rybakov MATEC Web Conf., 77 (2016) 01027 Published online: 03 October 2016 DOI: 10.1051/matecconf/20167701027