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Computational Cavitation Flows at Inception and Light Stages on an Axial-Flow Pump Blade and in a Cage-Guided Control Valve

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Journal of Thermal Science 2007年第4期16卷 337-345页

作者： Sumio SAITO MasahiroSHIBATA HideoFUKAE Eisuke OUTA Tokyo National College of Technology 1220-2 Kunugida-machiHachioji-shiTokyo 193-0997 Graduate student Graduate School of Science and EngineeringWaseda University Department of Mechanical Engineering Waseda UniversityOkubo 3-4-1Shinjyuku-ku Tokyo 1600072Japan

Cavitation flows induced around an axial-flow pump blade and inside a high pressure cage-type valve are simulated by a two-dimensional unsteady Navier-Stokes analysis with the simplest treatment of bubble dynamics. The fluid is assumed as a continuum of homogeneous dispersed mixture of water and vapor nuclei. The analysis is aimed to capture transient stages with high amplitude pressure change during the birth and collapse of the bubble especially at the stage of cavitation inception. By the pump blade analysis, in which the field pressure is moderate, cavitation number of the inception and locations of developed cavitation are found to agree with experimental results in a wide flow range between high incidence and negative incidence. In the valve flow analysis, in which the water pressure of 5MPa is reduced to 2MPa, pressure change responding to the bubble collapse between the vapor pressure lower than 1 KPa and the extreme pressure of higher than 104 KPa is captured through a stable computation. Location of the inception bubble and pressure force to the valve plug is found agree well with the respective experimental features.

关键词： Cavitation unsteady cfd hydrofoil control valve homogeneous mixture inception and collapse transient pressure

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Design of a two spool contra-rotating turbine for a turbo-fan engine

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Propulsion and Power Research 2020年第3期9卷 225-239页

作者： Prathapanayaka Rajeevalochanam S.N.Agnimitra Sunkara Seepana Venkata Ramana Murthy R.Senthil Kumaran Propulsion Division CSIR-National Aerospace LaboratoriesBangaloreKarnataka560017India Turbine Group Gas Turbine Research EstablishmentDRDOBangalore.Karnataka560093India

Contra-rotating turbines offer enhanced performance over their conventional corotating *** addition,vaneless contra-rotating turbine stages offer lesser stage length along with improved ***-rotating turbines with a vaned LP stages offer a controlled work-split between the stages over a wider range of operating conditions by maintaining inlet swirl to the second *** objective of the present work is to design an equivalent vaned contra-rotating turbine for an existing co-rotating configuration of a two-spool turbo fan *** contra-rotating turbine is designed by retaining the existing flow path and HP turbine,and redesigning the LP turbine for fixed radial distributions of inlet total temperature,pressure and swirl.A comparative study between performance of the co-rotating and contra-rotating turbines is carried out for different *** testing of the LP stator and rotor mean sections was carried out to validate the *** LP stage of contra-rotating turbine exhibits a performance improvement by 2%points at design point,as per flow *** reduced flow deflection in stator row is the primary reason for significant reduction in profile and secondary losses in contra-rotating turbine,which contributed to the performance improvement.A significant reduction of 23%in blade weight and 45% in LP stator vane count is obtained.

关键词： Contra-rotating turbine Computational fluid dynamics Vaned contra-rotating Two spool unsteady cfd

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