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Study on the thermodynamical and mechanical conditions for the generation of high operating pressures with liquefied gases for low and very low flow rates

Untersuchung der physikalischen und mechanischen Voraussetzungen zur Erzeugung hoher Betriebsdrücke mit Flüssiggasen für kleine und kleinste Fördermengen. Köln: Wiss. Berichtswesen d. DFVLR 1989 (European Space Agency Technical Translation ESA-TT-1148) o.A.

Erscheinungsjahr: 1989

Publikationstyp: Buchbeitrag (Übersetzung)

Sprache: Englisch

GeprüftBibliothek

Inhaltszusammenfassung


High pressure cryogenic liquid pumps handling low boiling liquids are investigated in the very low mass flow range. The cavitation problem becomes predominant with lower pump capacities caused by the increasing ratio of heat loss to the pump capacity. Based on a mechanical design study a first prototype for low flow rates has been developed and investigated. The amount of incoming heat from the environment and the sealing problems of the reciprocating piston against high pressure occurred as ...High pressure cryogenic liquid pumps handling low boiling liquids are investigated in the very low mass flow range. The cavitation problem becomes predominant with lower pump capacities caused by the increasing ratio of heat loss to the pump capacity. Based on a mechanical design study a first prototype for low flow rates has been developed and investigated. The amount of incoming heat from the environment and the sealing problems of the reciprocating piston against high pressure occurred as the main problems. A new lifting pump concept and a patented construction promised to offer solutions and further essential advantages. After detailed investigations and improvements the new prototype is operable without being submerged in the cryogenic liquid and has a short instationary cooling period. The realization of single-staged high pressure cryogenic liquid pumps for low mass flow rates is demonstrated. It appeared that the prevention of cavitation caused by frictional heat between reciprocating piston and cylinder is neither possible nor necessary. » weiterlesen» einklappen

Klassifikation


DFG Fachgebiet:
Wärmeenergietechnik, Thermische Maschinen, Strömungsmechanik

DDC Sachgruppe:
Ingenieurwissenschaften

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