Thesis (M.S. in Operations Research)--Naval Postgraduate School, March 2005. / Thesis Advisor(s): David A. Schrady. Includes bibliographical references (p. 83-85). Also available online.

Thesis (M.A.)--Naval Postgraduate School, 2003. / Title from title screen (viewed Apr. 5, 2004). "ADA414654"--URL. Includes bibliographical references (p. 87-91). Also issued in paper format.

Thesis (Th. M.)--Detroit Baptist Theological Seminary, 1983. / Includes bibliographical references (leaves [68]-74).

Thesis (Th. M.)--Detroit Baptist Theological Seminary, 1983. / Includes bibliographical references (leaves [68]-74).

Thesis (Th. M.)--Detroit Baptist Theological Seminary, 1983. / Includes bibliographical references (leaves [68]-74).

Submitted by Estagiário SPT BMHS (spt@fgv.br) on 2011-12-28T13:32:13Z No. of bitstreams: 1 000013493.pdf: 12836291 bytes, checksum: 011a7cfe08827805ea95b7d65aed53ec (MD5) / Approved for entry into archive by Estagiário SPT BMHS (spt@fgv.br) on 2011-12-28T13:32:23Z (GMT) No. of bitstreams: 1 000013493.pdf: 12836291 bytes, checksum: 011a7cfe08827805ea95b7d65aed53ec (MD5) / Approved for entry into archive by Estagiário SPT BMHS (spt@fgv.br) on 2011-12-28T13:32:30Z (GMT) No. of bitstreams: 1 000013493.pdf: 12836291 bytes, checksum: 011a7cfe08827805ea95b7d65aed53ec (MD5) / Made available in DSpace on 2011-12-28T13:32:37Z (GMT). No. of bitstreams: 1 000013493.pdf: 12836291 bytes, checksum: 011a7cfe08827805ea95b7d65aed53ec (MD5) Previous issue date: 1980 / O mar foi o primeiro meio de comunicação usado entre pessoas muito distantes. Através dele os povos se visitaram mutuamente, possibilitando a troca de experiências, com o consequente progresso da humanidade. Ele sempre atraiu o homem, ávido na busca de conhecimentos, conquistas, aventuras, comércio, enfim , uma gama de propósitos quase tão extensos como sua própria imensidão. A necessidade de conseguir seu domínio absoluto se faz sentir desde as épocas mais remotas, pois seus 35 milhões de quilômetros quadrados representam 71% de nosso planeta.

<p> Numerical simulations of waterjet inlets have been conducted in order to understand inlet performance during ship turning maneuvers. During turning maneuvers waterjet systems may experience low efficiency, cavitation, vibration, and noise. This study found that during turns less energy arrived at the waterjet pump relative to operating straight ahead, and that the flow field at the entrance of the waterjet pump exhibited a region of both low pressure and low axial velocity. The primary reason for the change in pump inflow uniformity is due to a streamwise vortex. In oblique inflow the hull boundary layer separates when entering the inlet and wraps up forming the streamwise vortex. These changes in pump inflow during turning maneuvers will result in increased unsteady loading of the pump rotor and early onset of pump rotor cavitation.</p><p> Simulations covered drift angles from 0&deg; to 30&deg;, pump velocities relative to free stream speed of 0.6 to 1.0 for inlet geometries with ramp angles of 25&deg; and 30&deg; with inlet-hull fairing radii relative to pump diameter of 0.1 to 0.2. The following observations were made: 1) the onset of the streamwise vortex occurred between drift angles of 5&deg; and 10&deg;; 2) increasing drift angle increased the strength of the streamwise vortex and lowered the energy of the flow entering the pump; 3) increasing the flow rate through the waterjet system increased the strength of the streamwise vortex; 4) increasing ramp angle tended to increase the strength of the streamwise vortex; and 5) increasing the fillet radius decreases the strength of the streamwise vortex.</p><p> Simulations of steady ahead operation of the waterjet propelled <i> R.V. Athena</i> were also conducted for Froude numbers of 0.34 to 0.84. From these simulations it was found that the pump inflow can be effectively approximated at a new ship speed from a known ship speed by scaling only the mean component of the axial velocity by the relative change in waterjet flow rate. Additionally, waterjet pump operating point and rotor blade inflow angles were found to independent of ship speed.</p>

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