The jet propulsion engine is used for the propulsion of aircraft, m issile and submarine (for vehicles operating entirely in a fluid) by the reaction of jet of gases which are discharged rearward (behind) with a high velocity. As applied to vehicles operating entirely in a fluid, a momentum is imparted to a mass of fluid in such a manner that the reaction of the imparted momentum furnishes a pr...

This paper discusses the design and integration of a desktop system for electrohydrodynamic jet (E-jet) printing. E-jet printing is a micro/nano-manufacturing process that uses an electric field to induce fluid jet printing through micro/nano-scale nozzles. This enables better control and resolution than traditional jet-printing processes. The printing process is predominantly controlled by cha...

Using jet propulsion, squid can swim at high speed or at low speed with good maneuverability, which makes them quiet valuable to be studied for biomimetic purposes. Vortex rings usually occur in the highly-unsteady jet flow in squid, and they play quite important roles in the jet propulsion of squid. This paper tries to investigate the squid jet structure by computational fluid dynamics (CFD) a...

Vampyroteuthis infernalis is a cosmopolitan cephalopod that lives in the oxygen minimum layer between 600 and 800 m depth. Morphometric and physiological studies have indicated that V. infernalis has little capacity for jet propulsion and has the lowest metabolic rate ever measured for a cephalopod. Because fin swimming is inherently more efficient than jet propulsion, some of the reduction in ...

di erential radar interferometry: the Landers earthquake Howard A. Zebker, Paul Rosen, Richard M. Goldstein, Andrew Gabriel, and Charles L. Werner Jet Propulsion Laboratory California Institute of Technology 4800 Oak Grove Drive Pasadena, CA 91109 May 10, 1994 To be subm itted to: JGR Earth Please address corresp ondence to: Howard A. Zebker MS 300-227 Jet Propulsion Laboratory 4800 Oak Grove D...

We review the first round of QCD studies at the c+ ecollider LEP, which started operating towards the end of last year. These studies at the peak of the 2’ resonance have proven to be extremely rewarding, not only because of the large statistics available due to the high resonance cross section, but also because of the higher centre of mass energy, which allows a much cleaner study of events wi...

Abstract: To study the influence of turning maneuvering navigation angle on inflow characteristics water jet propulsion pumps, numerical simulations were conducted mixed flow pumps under straight and left right 15 °/30 ° states. By comparing hydraulic performance differences five states, intrinsic relationship between pump morphology was elucidated, evolution mechanism conditions emphasized, co...

The thrust-generating mechanism of a prolate hydromedusa Sarsia tubulosa and an oblate hydromedusa Aequorea victoria was investigated by solving the incompressible Navier-Stokes equations in the swirl-free cylindrical coordinates. The calculations clearly show the vortex dynamics related to the thrust-generating mechanism, which is very important for understanding the underlying propulsion mech...

Pulsed-jets are commonly used for aquatic propulsion, such as squid and jellyfish locomotion. The sudden ejection of a jet with each pulse engenders the formation of a vortex ring through the roll-up of the jet shear layer. If the pulse is too long, the vortex ring will stop forming and the remainder of the pulse is ejected as a trailing jet. Recent results from mechanical pulsedjets have demon...