The issue of using vortex generators to improve the take-off and landing characteristics a transport category aircraft has been considered. Three directions have analyzed. first: installation on nacelles main engines increase maximum value lift coefficient in modes. second: upper surface flap lifting wing by improving flow around flap. third: tail unit efficiency control surfaces reducing handl...

In the present study, heat transfer and thermal efficiency of double-pipe exchangers with novel Double-Perforated Inclined Elliptic (DPIE) turbulators were experimentally investigated. The range Reynolds number was between 5000 18,000 under turbulent flow regime. inclination angle elliptic inserts (?), perforation diameters (d) varied from 15° to 25°, 0.5 mm < d 1.5 mm, respectively. perforated...