Wyniki wyszukiwania - BazTech

1

Obliczenia numeryczne drgań wirnika dwustopniowej wirowej pompy diagonalnej

Jarzyna T.

Inżynieria i Aparatura Chemiczna

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2014

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Nr 6

398--399

PL

Przedstawiono wyniki obliczeń numerycznych wirnika dwustopniowej wirowej pompy diagonalnej przeprowadzonych za pomocą dwóch programów komputerowych: 1. AxisVM- Structural Analysis and Design Software, 2. MSC.Adams, the Multibody Dynamics Simulation Solution. Wyniki symulacji komputerowych porównano z wynikami obliczeń analitycznych opublikowanymi we wcześniejszej pracy autorów, co pozwoliło na ocenę zgodności różnych metod obliczeniowych.

EN

Results of numerical calculations of the rotor of two stage impeller mixed-flow pump, carried out using two software: AxisVM - Structural Analysis and Design Software and MSC.Adams, the Multibody Dynamics Simulation Solution are presented in the paper. The computer simulations results were compared with the analytical calculations results published in author’s earlier paper. Such comparison allowed one to assess the compatibility of different calculation methods.

2

Obliczanie częstotliwości drgań własnych wirnika pompy w zależności od sposobu jego podparcia

Holka H., Jarzyna T.

Inżynieria i Aparatura Chemiczna

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2013

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Nr 2

100-101

PL

W pracy przedstawiono zagadnienie modelowania wirników pionowych pomp diagonalnych. Zaprezentowano trzy modele wirników różniące się sposobem podparcia: czteromasowy, dyskretny model wirnika na sztywnych podporach, model wirnika na podporach o sztywności k, model wirnika na podporach o sztywności k oraz tłumieniu c. Wprowadzenie sztywności k spowodowało obniżenie częstotliwości drgań własnych w stosunku do podpór sztywnych, natomiast łączne uwzględnienie k oraz c spowodowało, że obliczona częstotliwość drgań wzrosła.

EN

Modeling of vertical mixed-flow pump shafts is presented in the paper. Three models of rotors with a different support were shown: four-mass discrete model of rotor on a rigid support, rotor model on supports with stiffness k, rotor model on supports with stiffness k and damping stiffness c. Introduction of stiffness k reduced values of eigenfrequencies for rigid supports, whereas considering k and c together, it caused the increase of calculated frequency of vibration.

3

Overview of Performance Modeling and New Model Development for Radial Turbomachinery Using Optimization Search Methodology with an Extensive Database

Japikse D., Pelton R., Oliphant K. N., Dubitsky O.

Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka

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2005

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nr 128, vol. 1

243-264

EN

Performance modeling of centrifugal and mixed-flow compressors and pumps has developed substantially over the past decades. The first half of the 1900s provided important insights as to the basic structure of the fluid dynamic process; the period from 1960 to 2005 provided 45 years of continuous analytical modeling development. Throughout the past century, the radial turbomachinery field awaited the development of a comprehensive loss, diffusion, and deviation modeling system similar to those that evolved for axial turbomachinery. Recently, a concrete foundation for an appropriate modeling system has developed. In this presentation, the basic models are reviewed and, in turn, the available database (more than 250 cases) is surveyed. A fully computerized, data synthesis process, employing optimization search techniques, is presented by which new analytical models can be thoroughly matched to available data.

4

Numerical analysis of cavitated flows in mixed-flow pump impellers

Sedlar M., Marsik F., Safarik P.

Zeszyty Naukowe Politechniki Świętokrzyskiej. Mechanika

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2003

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Z. 77

57-64

EN

This paper deals with the flow model based on the Navier-Stokes computation and the simulation of bubble dynamics in the flow field, solving the Rayeigh-Plesset equation alongflow characteristics. No interaction between bubbles is considered. The initial bubble sizedistribution is based on a precribed distribution law and the initial void fraction. The flowpast the blades of mixed-flow pump impellers is investigated including the tip leakage flowsfor three different impeller configurations, aimed to predict the impeller configuration influence on cavitation phenomena, especially the blade surface regions endangered with the cavitation phenomena, especially the blade surface regions endangered with the cavitation erosion.

5

Numerical investigation of flow in mixed-flow pump with volute

Sedlar M.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

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2001

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Vol. 5, No 4

595-602

EN

The work considers the modelling of flow in a complete mixed-flow pump with volute, including tip leakage flows, using both quasi-steady and true transient models of rotor/stator interaction. The CFX-TASCflow CFD package from AEA Technology is applied to calculate flows for a wide range of flow rates from about 0.2 to 1.4 Q/sub 0pt/. Fairly detailed flow structures have been predicted based on the flow rates, especially impeller inlet recirculation and separation on the suction side of the blades for suboptimal rates of flow, as well as strong secondary flows and separation in the volute for off-design conditions. The rotor/stator interaction influence on flow phenomena both in the impeller and volute have been investigated with very interesting results, providing good insight into the dynamics of flow close to the volute tongue. Based on the computational results, pump performance curves (Q-H, Q- eta /sub h/ and Q-P, eta /sub h/ being the hydraulic efficiency) have been obtained. The data from this numerical investigation have been used to improve the inlet part of the impeller blades, especially close to the tip. The geometry modifications have resulted in reduced cavitation in the impeller as well as noise at suboptimal rates of flow.