Results 91 to 100 of about 34,356 (208)
Computational methods for internal flows with emphasis on turbomachinery [PDF]
Current computational methods for analyzing flows in turbomachinery and other related internal propulsion components are presented. The methods are divided into two classes. The inviscid methods deal specifically with turbomachinery applications. Viscous
Mcnally, W. D., Sockol, P. M.
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OPTIMIZATION OF TIP SEAL WITH HONEYCOMB LAND IN LP COUNTER ROTATING GAS TURBINE ENGINE
TASK Quarterly, 2010 The goal of the presented work is an optimization of the geometrical configuration of the tip seal with a honeycomb land, to reduce the leakage flow in the counter-rotating LP turbine of a contra-rotating open rotor aero-engine.
WŁODZIMIERZ WRÓBLEWSKI +3 more
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A model for closing the inviscid form of the average-passage equation system [PDF]
A mathematical model is proposed for closing or mathematically completing the system of equations which describes the time average flow field through the blade passages of multistage turbomachinery.
Adamczyk, J. J. +2 more
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Turbomachinery technology for high-speed civil flight [PDF]
NASA Lewis' research and technology efforts applicable to turbomachinery for high-speed flight are discussed. The potential benefits and cycle requirements for advanced variable cycle engines and the supersonic throughflow fan engine for a high-speed ...
Glassman, Arthur J., Saunders, Neal T.
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Advanced propulsion concepts for orbital transfer vehicles [PDF]
Studies of the United States Space Transportation System show that in the mid-to-late 1990s expanded capabilities for Orbital Transfer Vehicles (OTV) will be needed to meet increased payload requirements for transporting materials and possible men to ...
Cooper, L. P.
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Impeller-Induced Rotor-Dynamic Forces [PDF]
, 1989 The flow through and around the rotor of a turbomachine exerts a force on the rotor and, hence, rotor shaft and bearing system. In some circumstances this force may lead to excitation of shaft whirl in the direction of impeller rotation.
Acosta, Allan J. +2 more
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Numerical method for modeling of acoustic waves propagation
Archives of Acoustics, 2013 In this paper, numerical results of modeling of acoustic waves propagation are presented. For calculation of the acoustic fluctuations, a solution of the full non-linear Euler equation is used.
Sławomir DYKAS +3 more
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Leakage performance of a novel turbomachinery shaft seal [PDF]
, 2009 Advanced sealing systems are needed to control parasitic leakage flows to achieve high turbine engine efficiency and low emissions. Typical extreme turbomachinery engine operating conditions when combined rotor excursions do not lend simple sealing ...
Akcan, Caner +3 more
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The design and performance estimates for the propulsion module for the booster of a TSTO vehicle [PDF]
A NASA study of the propulsion systems for possible low-risk replacements for the Space Shuttle is presented. Results of preliminary studies to define the USAF two-stage-to-orbit (TSTO) concept to deliver 10,000 pounds to low polar orbit are described ...
Maldonado, Jaime J. +1 more
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Navier-Stokes analysis of transonic cascade flow [PDF]
A new kind of C-type grid is proposed, this grid is non-periodic on the wake and allows minimum skewness for cascades with high turning and large camber.
Arnone, A., Liou, M.-S., Povinelli, L.
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