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RISPerturbed Flow Structure in an Annular Seal Due to Synchronous Whirl
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This paper provides a thorough examination of the flow field resulting from synchronous whirl of an eccentric rotor in an annular seal under typical operating conditions. A new finite-element-based ...
Swirl Brake Effect on the Rotordynamic Stability of a Shrouded Impeller
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The swirling motion of the shroud-to-housing leakage flow in pumps is known to have an adverse impact on the impeller rotordynamic stability. Swirl brakes, under such circumstances, would enhance ...
Optimization of the Three-Dimensional Flow Path in the Scroll-Nozzle System of a Radial Inflow Turbine
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A three-dimensional inviscid flow analysis in the combined scroll-nozzle system of a radial inflow turbine is presented. The coupling of the two turbine components leads to a geometrically ...
Finite-Element Analysis of Turbulent Flow in Annular Exhaust Diffusers of Gas Turbine Engines
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A finite-element model of the turbulent flow field in the annular exhaust diffuser of a gas turbine engine is developed. The analysis is based on a modified version of the Petrov-Galerkin ...
A New Model for Leakage Prediction in Shrouded-Impeller Turbopumps
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The swirling secondary flow in the shroud-to-housing passage of a turbopump stage is analyzed. The flow model is based on the weighted-residual finite-element method to solve the axisymmetric ...
Flow Field in the Secondary, Seal-Containing Passages of Centrifugal Pumps
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This paper illustrates the impact of seal configuration on the through-flow leakage in centrifugal pumps with shrouded impellers. The flow model is based on the Petrov-Galerkin finite element ...
Interrelated Rotordynamic Effects of Cylindrical and Conical Whirl of Annular Seal Rotors
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A comprehensive approach for computing the dynamic coefficients of an annular seal is presented. The coefficients are partly those associated with a uniform lateral eccentricity mode of the rotor ...
A Finite-Element Perturbation Approach to Fluid/Rotor Interaction in Turbomachinery Elements. Part 1: Theory
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The vibrational characteristics of a rotor that is in contact with a fluid in an annular clearance gap, as dictated by the fluid forces in the gap, are investigated. The “rotor” here is a ...
A Finite-Element Perturbation Approach to Fluid/Rotor Interaction in Turbomachinery Elements. Part 2: Application
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A newly devised perturbation model for the fluid-induced vibration of turbomachinery rotating elements is used to compute the rotordynamic coefficients of an annular seal. First, the finite ...
Rotordynamic Effects of the Shroud-to-Housing Leakage Flow in Centrifugal Pumps
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The fluid/shroud interaction forces acting on a pump impeller that is precessing around the housing centerline, are computed and the rotordynamic coefficients deduced. The numerical procedure ...