The engineering and scientific community has been searching for the identification of surrogate fuels that can reasonably represent the performance and emissions behavior of jet fuels (e.g., Jet A, JP-8) in engines. Many proposals exist in the literature, but there has been no consensus of opinion. It has been recognized that if the surrogate (or its) components were identified and agreed upon,...

Supersonic commercial aircraft noise predictions have frequently considered only exhaust noise from the jet engines. Meeting the stringent noise requirements that apply to the subsonic fleet will require reducing jet exhaust noise to the point that fan noise may also require reduction. This report discusses the prediction of fan noise for a supersonic commercial aircraft using existing empirica...

Radiation of sound waves from a semi-infinite cylindrical duct with perforated end whose outer wall is coated acoustically absorbent material investigated by using the Wiener-Hopf technique in conjunction mode matching technique. A screen can be used as model for many engineering applications, such noise reduction exhausts automobile engines, modern aircraft jet, and turbofan engines. In partic...

Dimethyl ether (DME) is considered a promising alternative to diesel fuel in compression-ignition engines because of low particulate and NOx emissions along with high thermal efficiencies as well as improved auto-ignition characteristics due to its high cetane number. Recently, DME also has been selected as a prospective fuel candidate for the validation of turbulent combustion models organized...

Numerical modeling of direct hydrogen injection and in-cylinder mixture formation is performed in this paper. Numerical studies on direct-injection hydrogen engines are very limited due mainly to the complexity in modeling the physical phenomena associated with the high-velocity gas jet. The high injection pressure will result in a choked flow and develop an underexpanded jet at the nozzle exit...

Control of jets has been studied for over a century and even today continues to be a significant research topic. It finds applications in various fields especially in aerospace, where enhancement of mixing characteristics of a jet can improve the performance greatly. Review articles by Gutmark et al.;1 Gutmark & Grinstein;2 Seiner et al.;3 Glezer & Amitay;4 Reynolds et al.;5 Ginevsky Vlasov & K...

Nonlinear Assignment Problems (NAPs) are combinatorial optimization problems for which no exact algorithm exists that can solve them in reasonable computational time. They enjoy applications in diverse areas, such as location theory, data association problems, physics, manufacturing and many others. This talk is divided into two parts. First an overview of NAPs will be presented, where diierent...

Abstract Research on the application of liquid fuels to continuously rotating detonation was conducted. A new method mixture preparation proposed. special system fuel injection designed and tested which is based injecting into chamber a preheated partially mixed with hot air at conditions higher than rich flammability limit. The specially selected allow all evaporate in supply but prevent it fr...