Results 1 to 10 of about 41 (30)
Open-Sea Testing of Two-Phase Marine Ramjet Propulsion [PDF]
Journal of Marine Science and Engineering, 2023 Open-sea testing of a two-phase marine ramjet vehicle has been conducted. This experimental phase was accomplished following comprehensive theoretical research. The concept of two-phase marine ramjet propulsion consists of a submerged propulsor acquiring
Shlomit Valensi, Alon Gany
doaj +5 more sources
Examining Metal Additives in a Marine Hybrid-Propellant, Water-Breathing Ramjet [PDF]
Journal of Marine Science and Engineering, 2022 This research focuses on theoretically and experimentally evaluating the performance of a metallized hybrid-propellant, water-breathing ramjet. The aluminum and/or magnesium particles added to a polymeric (polyester) fuel grain are hydro-reactive, using ...
Nachum E. Eisen, Alon Gany
doaj +6 more sources
Multiphase Marine Ramjet Using Liquefied Gas as a Source of Bubbles [PDF]
Journal of Marine Science and Engineering, 2020 An innovative variant of a multiphase marine ramjet is investigated analytically and experimentally. Pressure liquefied gas (LG) is injected, boiling under superheat conditions in the water stream within the propulsion unit, and serving as an on-board ...
Herman D. Haustein +2 more
doaj +6 more sources
Theoretical Performance Evaluation of a Marine Solid Propellant Water-Breathing Ramjet Propulsor [PDF]
Journal of Marine Science and Engineering, 2019 This work analyzes and presents theoretical performance of a marine water-breathing ramjet propulsor. A conceptual scheme of the motor is shown, the equation of thrust is presented, and the dependence on cruise velocity and depth are discussed. Different propellant compositions, representing a wide variety of formulations suitable for propelling a ...
Nachum E. Eisen, Alon Gany
openaire +3 more sources
Dynamic Testing of a Hybrid-Propellant Water-Breathing Ram Rocket in Underwater Cruise Conditions [PDF]
Journal of Marine Science and EngineeringHigh-speed submerged marine vehicles, such as torpedoes, traveling at velocities of an order of 100 m/s and above, require powerful propulsion to overcome the tremendous hydrodynamic drag.
Sagi Dinisman +2 more
doaj +2 more sources
Historical and current usage of per‐ and polyfluoroalkyl substances (PFAS): A literature review
American Journal of Industrial Medicine, Volume 66, Issue 5, Page 353-378, May 2023., 2023 Abstract Background Per‐ and polyfluoroalkyl substances (PFAS) have uniquely useful chemical and physical properties, leading to their extensive industrial, commercial, and consumer applications since at least the 1950s. Some industries have publicly reported at least some degree of information regarding their PFAS use, while other industries have ...
Linda G. T. Gaines
wiley +1 more source
The Impact on the Ozone Layer of a Potential Fleet of Civil Hypersonic Aircraft
Earth's Future, Volume 8, Issue 10, October 2020., 2020 Abstract The aeronautical community is currently researching technology that might lead to commercial hypersonic aircraft that would cruise at Mach 5–8 in the middle or upper stratosphere and would transfer passengers from London to New York or from Los Angeles to Tokyo in just a couple of hours.
Douglas Kinnison +4 more
wiley +1 more source
Performance Comparison of Bow and Stern Rudder for High‐Speed Supercavitating Vehicles
Mathematical Problems in Engineering, Volume 2020, Issue 1, 2020., 2020 To predict the hydrodynamic characteristics and supercavity shape of supercavitation flows, the numerical model including VOF, cavitation model, and turbulence models is presented and validated by a well‐established empirical correlation. The numerical method is then employed to simulate the high‐speed supercavitating vehicles with two different types ...
Chuang Huang +5 more
wiley +1 more source
Feasibility study on a seajet system for marine propulsion [PDF]
, 2021 LAUREA MAGISTRALELa riduzione delle emissioni e il taglio del consumo di carburante nei trasporti sta costringendo l'industria navale a studiare e sviluppare nuove tecnologie, che permetterebbero un esercizio più ecologico delle flotte.
Civaroli, Matteo
core
Spatial Kinetics Model of Supercavitating Vehicles Reflecting Conic‐Like Oscillation
Mathematical Problems in Engineering, Volume 2017, Issue 1, 2017., 2017 A spatial kinetics model for supercavitating vehicles including the coupled motion of pitch, yaw, and rolling was presented. Mathematical simulations were performed to investigate dynamic performance of supercavitating vehicles. An intrinsic conic‐like oscillation in the motion of supercavitating vehicles was discovered.
Chuang Huang +5 more
wiley +1 more source