177,617 research outputs found
Numerical Simulations for Plug Nozzle Flowfields
No full textThe reduction of Earth-to-Orbit launch costs in conjunction with an increase in launcher realibility and operational efficiency are the key demands on future space transportation systems, like Single- Stage-to-Orbit vehicles. The realization of these vehicles strongly depend on the capability of the engines, in delivery high performances at low systems complexity. In this paper we are interested to develop a 2- D axysimmetric numerical procedure, easily extendible to 3-D configurations, based on the full time-dependent Navier-Stokes equations to compute the external flow of the linear plug nozzle. We will address our numerical investigation on the performance of the linear plug nozzles in different flight configuration. © 2001 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved
Numerical simulation of the unsteady flowfield in complete propulsion systems
No full textA non-linear numerical simulation technique for predicting the unsteady performances of an air-
breathing engine is developed. The study focuses on the simulation of integrated propulsion systems, where
a closer coupling is needed between the airframe and the engine dynamics. In fact, the solution of the fully
unsteady flow governing equations, rather than a lumped volume gas dynamics discretization, is essential for
modeling the coupling between aero-servoelastic modes and engine dynamics in highly integrated
propulsion systems. This consideration holds for any propulsion system when a full separation between the
fluid dynamic time-scale and engine transient cannot be appreciated, as in the case of flow instabilities (e.g.,
rotating stall, surge, inlet unstart), or in case of sudden external perturbations (e.g., gas ingestion).
Simulations of the coupling between external and internal flow are performed. The flow around the nacelle
and inside the engine ducts (i.e. air intakes, nozzles) is solved by CFD computations, whereas the flow
evolution through compressor and turbine bladings is simulated by actuator disks. Shaft work balance and
rotor dynamics are deduced from the estimated torque on each turbine/compressor blade row
Mainardini, Marsilio
No full textNon esiste. ovviamente, in senso proprio, un autore, e neppure un curatore di un volume del Dizionario Biografico degli Italiani
La parte della voce di cui porto diretta responsabilità inserisce la redazione delle opere attribuite con certezza a Marsilio nel contesto del suo profilo biografic
Réplique au compte-rendu de M. Cavagna a R. Brusegan, Venezia, Marsilio, 2004 (Collana di Classici francesi), 472 pp.
No full textRéplique au compte-rendu de M. Cavagna a R. Brusegan, Venezia, Marsilio, 2004 (Collana di Classici francesi), 472 pp
Cumplir con cuidado: il mercato del credito genovese negli anni 1630-1640. Vecchi protagonisti e nuove strategie
No full textIl mercato del denaro internazionale nella prima metà del XVII secolo. La leadership dei banchieri genovesi tra Italia e Impero spagnol
Teoria musicale e tecniche di composizione astrologica in Marsilio Ficino
No full textThe aim of this essay, divided into two parts, is to investigate the relations between musical theory and practice in Marsilio Ficino’s philosophy. The principles
of music in the 'Commentarium in Timaeum' and the epistle 'De rationibus musicae' find an application in Ficino’s Orphic singing and magico-astrological music of the 'De vita coelitus comparanda'. The study of this texts demonstrates that the philosopher was not only a musician but also an innovative theorist of music
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