Space Shuttle Main Engine: Part Number RS007001

Topics considered include: low-pressure oxidizer turbopump; low-pressure fuel turbopump; high-pressure oxidizer turbopump; high-pressure oxidizer turbopump turbine; high-pressure fuel turbopump; and SSME propellant flow schematic

The Effect of Inlet Swirl on the Rotordynamic Shroud Forces in a Centrifugal Pump

The role played by fluid forces in determining the rotordynamic stability of a centrifugal pump is gaining increasing attention. The present research investigates the contributions to the rotordynamic forces from the discharge-to-suction leakage flows between the front shroud of the rotating impeller and the stationary pump casing. In particular, the dependency of the rotordynamic characteristics of leakage flows on the swirl at the inlet to the leakage path was examined. An inlet guide vane was designed for the experiment so that swirl could be introduced at the leakage flow inlet. The data demonstrate substantial rotordynamic effects and a destabilizing tangential force for small positive whirl ratios: this force decreased with increasing flow rate. The effect of swirl on the rotordynamic forces was found to be destabilizing

Measurements for the rotordynamic shroud forces for centrifugal pumps

An experiment was designed to measure the rotordynamic shroud forces on a centrigual pump impeller. The measurements were doen for various whirl/impeller ratios and for different flow rates. A destabilising tangential force was measured for small positive whirl ratios and this force decreased with increasing flow rate

Rotordynamic Forces Generated by Discharge-to-Suction Leakage Flows in Centrifugal Pumps

This paper reviews the current state of knowledge of rotordynamic forces caused by the discharge-to-suction leakage flows in centrifugal pumps. The indications that these flows could contribute significantly to the rotordynamics motivated the fabrication of an experiment in which measurements of rotordynamic forces would be made on simulated leakage flows in which the flow rate, clearance, eccentricity and other parameters would be exercised in order to understand the phenomena. Sample data is presented and demonstrates substantial rotordynamic effects which could be potentially destabilizing. The rotordynamic forces appear to be inversely propertional to the clearance and change significant with the flow rate

Experimental Results for the Rotordynamic Characteristics of Leakage Flows in Centrifugal Pumps

In recent years, increasing attention has been give to fluid-structure interaction problems in turbomachines. The present research focuses on just one such fluid-structure interaction problem, namely, the role played by fluid forces in determining the rotordynamic stability and characteristics of a centrifugal pump. The emphasis of this study is to investigate the contributions to the rotordynamic forces from the discharge-to-suction leakage flows between the front shroud of the rotating impeller and the stationary pump casing. An experiment was designed to measure the rotordynamic shroud forces due to simulated leakage flows for different parameters such as flow rate, shroud clearance, face-seal clearance and eccentricity. The data demonstrate substantial rotordynamic effects and a destabilizing tangential force for small positive whirl frequency ratios; this force decreased with increasing flow rate. The rotordynamic forces appear to be inversely proportional to the clearance and change significantly with the flow rate. Two sets of data taken at different eccentricities yielded quite similar nondimensional rotordynamic forces indicating that the experiments lie within the linear regime of eccentricity

Importance of foot and mouth disease vaccine purity in interpreting serological surveys

The aim of this study was to determine whether the degree of purity achieved in conventional vaccines against the foot and mouth disease virus in Argentina interferes with the interpretation of seroepidemiological surveys for confirming the absence of viral activity, which are performed to support the recognition of free zones practising vaccination. The evaluation of 168 vaccine series due to be marketed in Argentina (2006–2012) and subjected to official control testing in cattle, as well as repeated vaccination of cattle and other species using vaccines with high antigen concentrations, demonstrated that they did not induce antibodies to non-structural proteins (NSPs). The results show clearly that vaccines with satisfactory potency do not induce a response to NSPs, even by forcing the immune response through more concentrated doses with multiple valences and revaccination protocols at shorter intervals than in vaccination campaigns. These results confirm that the vaccines used in routine vaccination programmes have a degree of antigen purification consistent with the needs observed on the basis of sampling for serological surveillance. Moreover, serological surveys conducted in 2006–2011 by Argentina’s official Veterinary Services – the National Health and Agrifood Quality Service (SENASA) – on more than 23,000 sera per year from cattle included in the vaccination programme, in order to confirm the absence of virus circulation, revealed an average 0.05% of reactive results, consistent with the specificity of the tests. In conclusion, the vaccines produced by conventional methods and with proven potency that are available in Argentina are sufficiently purified to ensure that they do not interfere with the interpretation of sampling for serological surveillance performed to support the recognition of FMD-free zones practising vaccination.Fil: Smitsaart, E.. Biogénesis Bagó; ArgentinaFil: Espinosa, A. M.. Biogénesis Bagó; ArgentinaFil: Maradei, E. D.. Ministerio de Agricultura, Ganadería, Pesca y Alimento. Servicio Nacional de Sanidad y Calidad Agroalimentaria; ArgentinaFil: Cosentino, B.. Ministerio de Agricultura, Ganadería, Pesca y Alimento. Servicio Nacional de Sanidad y Calidad Agroalimentaria; ArgentinaFil: Guinzburg, M.. Biogénesis Bagó; ArgentinaFil: Maddoni, G.. Ministerio de Agricultura, Ganadería, Pesca y Alimento. Servicio Nacional de Sanidad y Calidad Agroalimentaria; ArgentinaFil: Cadennazzi, G.. Ministerio de Agricultura, Ganadería, Pesca y Alimento. Servicio Nacional de Sanidad y Calidad Agroalimentaria; ArgentinaFil: Bottini, R.. Ministerio de Agricultura, Ganadería, Pesca y Alimento. Servicio Nacional de Sanidad y Calidad Agroalimentaria; ArgentinaFil: Filippi, J.. Biogénesis Bagó; ArgentinaFil: Bergmann, Ingrid Evelyn. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Ciencia y Tecnología "Dr. César Milstein". Fundación Pablo Cassará. Instituto de Ciencia y Tecnología ; Argentin

Deep Throttle Turbopump Technology Testing

The objectives of this viewgraph presentation were to: (1) enhance and demonstrate critical technologies in support of planned RBCC flight test programs; and (2) obtain knowledge of wide flow range as it is applicable to liquid rocket engine turbopumps operating over extreme throttle ranges. This program was set up to demonstrate wide flow range diffuser technologies. The testing phase of the contract to provide data to anchor initial designs was partially successful. Data collected suggest flow phenomena exists at off-design flow rates

Satellite altimetry applications in the Caspian Sea

978-3-642-12795-

Vocação de criar: anotações sobre a cultura e as culturas populares Vocation to create: notes on culture and popular cultures

O artigo examina diferentes dimensões da cultura e das polêmicas que envolvem o termo para dizer da(s) cultura(s) popular(es) como derivação também controvertida. Diferentemente dos estudos sobre o eixo cultura-cultura popular, num exercício de memória, busca-se o processo de criação dos movimentos de cultura popular dos anos 1960 no Brasil para, então, aproximá-lo dos tempos atuais e mostrar como a cultura e a cultura popular foram levadas ao campo da prática política e integraram nelas um novo sentido dado à própria educação. Trata-se da discussão entre cultura e educação como espaços francamente abertos e dialógicos que se abrem à difícil e complexa arte da criação, da partilha e do intercâmbio de e entre culturas populares, do papel do saber e da reprodução do saber como questão substantiva no eixo entre cultura e educação.<br>This article examines different dimensions of culture and the controversies surrounding this term when used to refer to "popular culture(s)";. Unlike studies on the axis culture-popular culture, an attempt is made to return to the beginning of the Brazilian popular culture movements in 60's, in order to bring them closer to the present time. In doing so, it will be possible to show how culture and popular culture were taken to the field of political praxis, integrating in them a new meaning given to education itself. The discussion points out that a substantive issue to be considered is if culture and education are conceived as spaces overtly open and dialogical in nature, typical of the difficult and complex art of creating, sharing and interchanging of (and between) popular cultures the role of knowledge and of the knowledge reproduction