The mixing noise in jet engine exhaust is one of the main noise sources in aviation. Nozzle lip serrations, commonly called chevrons, are one of the technologies deployed to address the issue in modern civilian aircraft. These nozzle serrations impinge on the shear layer and change its dynamics; the jet plume becomes lobed or serrated near the nozzle in a time-averaged sense, but reverts to a r...

Abstract With the approach of next generation supersonic transport entry into service, new research activities were initiated to support updates on ICAO regulations and certification processes for vehicles. Within this context, EU Horizon 2020 SENECA project has been launched investigate levels noise gaseous emissions in vicinity airports as well global climate impact civil aircraft. This paper...

Compliance with environmental protection regulations, in particular, community noise requirements, constitutes one of the major obstacles for designing future supersonic civil aircraft. Although there are several sources that contribute to total level aircraft, it is turbulent jet appears most problematic; a dominant source low-to moderate- bypass-ratio engines, and at present no effective meth...

In this paper, we present a monitoring program of loss control prevention for airlines to enhance aviation safety and operational efficiency. The assessments dynamic stability characteristics based on the approaches oscillatory motion eigenvalue modes jet transport aircraft response sudden plunging motions are demonstrated. A twin-jet encountering severe clear-air turbulence in transonic flight...

Friction drag constitutes approximately half of the total subsonic civil transport aircraft at cruise conditions. Several means were examined to control flow over an and achieve laminar flow. Here, a new concept for friction reduction in form integration aerodynamics propulsion is put forward. Engines buried wing rear fuselage suck boundary layer entire surface, then, they used it as intake air...

Scientific research studies on jet noise generation have been ongoing since the early 1950s, when turbojets were first used in commercial aircraft. Several numerical methods developed with aim of reducing environmental issues related to impact community annoyance. Among them, development fast and comprehensive tools for prediction captured attention researchers engineers, being very useful prel...

This paper describes the development and use of background-oriented schlieren imaging a full-scale supersonic jet in flight. A series flight tests was performed April 2011, October 2014, February 2015, December 2018 using flora desert floor corridor near Edwards Air Force Base as background. Flight planning designed based on camera resolution, mean size color predominant plants, coordination se...