Topic
Propulsion
About: Propulsion is a research topic. Over the lifetime, 24977 publications have been published within this topic receiving 200311 citations.
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16 Oct 2006
TL;DR: The development of ship propulsion synchronous motors with high temperature superconductor (HTS) field windings for Naval electric ship applications has progressed to the point where a full scale motor is now under construction as discussed by the authors.
Abstract: The development of ship propulsion synchronous motors with high temperature superconductor (HTS) field windings for Naval electric ship applications has progressed to the point where a full scale motor is now under construction. A 5 MW, 230-rpm prototype ship propulsion motor was built and tested by the Center for Advanced Power Systems (CAPS) on behalf of U.S. Office of Naval Research (ONR). It met or exceeded all its design goals. Currently, a 36.5 MW, 120-rpm ship propulsion motor is being built for delivery to ONR at the end of 2006. This paper presents test results of the 5 MW motor and the status of the 36.5 MW motor.
62 citations
TL;DR: In this paper, a phenomenological model has been developed to consider the relevant processes inside the cylinder of a homogeneous-charge compression-ignition (HCCI) engine, and lower possible limits of scaling-down HCCI cycle engines are proposed.
62 citations
01 Jan 1978
TL;DR: In this article, a historical review on the research and development of liquid hydrogen for use as a propulsion fuel is presented, divided into three parts: Part 1 (1945-1950), Part 2 (1950-1957), and Part 3 (1957-1958), encompassing eleven topics.
Abstract: A historical review is presented on the research and development of liquid hydrogen for use as a propulsion fuel. The document is divided into three parts: Part 1 (1945-1950); Part 2 (1950-1957); and Part 3 (1957-1958), encompassing eleven topics. Two appendixes are included. Hydrogen Technology Through World War 2; and Propulsion Primer, Performance Parameters and Units.
62 citations
TL;DR: In this article, a two-dimensional panel method is developed for the hydrodynamic analysis of the flapping hydrofoil, where the instantaneous angle of attack is influenced by foil's oscillatory motion and the incident waves.
Abstract: Oscillating wings are investigated as unsteady thrusters, augmenting ship's overall propulsion in waves. Flapping propulsor's heave is induced by ship's motions, while pitching motion is set by an active control mechanism. For the detailed investigation of the free-surface effects, a two-dimensional panel method is developed for the hydrodynamic analysis of the flapping hydrofoil. The instantaneous angle of attack is influenced by foil's oscillatory motion and the incident waves. We consider moderate submergence and speed, permitting us to approximately neglect effects of breaking waves and cavitation, and linearize the free-surface boundary conditions and the trailing vortex wake dynamics. Numerical calculations are presented concerning the performance of the developed BEM over a range of motion parameters and compared against other methods and experimental data. Our analysis indicates that significant efficiency is achieved under optimal operating conditions and the free surface effects cannot be neglected. In the presence of waves the thrust coefficient is observed to raise well above its value in infinite domain, with maximum gain reaching 20%, for appropriate selection of the parameters. The present method could serve as a useful tool for the assessment, preliminary design and control of the studied system, extracting energy from sea waves for marine propulsion.
62 citations
TL;DR: In this paper, experimental results concerning the performance of a fuel cell power train are reported and discussed, and characterization results for a small sized fuel cell system (FCS), based on a 2.5kW PEM stack, alone and coupled to an electric propulsion chain of 3.7kW, are presented and discussed.
62 citations