scholarly journals Numerical Simulation of 3D Cavitating Flows: Analysis of Cavitation Head Drop in Turbomachinery

2008 ◽  
Vol 130 (6) ◽  
Author(s):  
Benoît Pouffary ◽  
Regiane Fortes Patella ◽  
Jean-Luc Reboud ◽  
Pierre-Alain Lambert
Keyword(s):  
Numerical Simulation ◽  
Numerical Simulations ◽  
Cold Water ◽  
Rocket Engine ◽  
Cavitating Flows ◽  
Internal Flows ◽  
Cavitation Phenomenon ◽  
Analysis Methodology ◽  
Space Agency

The numerical simulation of cavitating flows in turbomachinery is studied at the Turbomachinery and Cavitation team of Laboratoire des Ecoulements Géophysiques et Industriels (LEGI), Grenoble, France in collaboration with the French space agency (Centre National d’Etudes Spatiales, CNES), the rocket engine division of Snecma and Numeca International. A barotropic state law is proposed to model the cavitation phenomenon and this model has been integrated in the CFD code FINE/TURBO™. An analysis methodology allowing the numerical simulation of the head drop induced by the development of cavitation in cold water was proposed and applied in the case of two four-bladed inducers and one centrifugal pump. Global results were compared to available experimental results. Internal flows in turbomachinery were investigated in depth. Numerical simulations enabled the characterization of the mechanisms leading to the head drop and the visualization of the effects of the development of cavitation on internal flows.

scholarly journals Numerical Simulation of 3D Cavitating Flows: Analysis of Cavitation Head Drop in Turbomachinery

2005 ◽  
Author(s):  
Benoiˆt Pouffary ◽  
Regiane Fortes Patella ◽  
Jean-Luc Reboud
Keyword(s):  
Numerical Simulation ◽  
Numerical Stability ◽  
Rocket Engine ◽  
State Law ◽  
Centrifugal Pumps ◽  
Cavitating Flows ◽  
Internal Flows ◽  
Cavitation Phenomenon ◽  
Space Agency

The numerical simulation of cavitating flows in turbomachinery is studied at the Turbomachinery and Cavitation team of LEGI (Grenoble - France) in collaboration with the French space agency (CNES) and the rocket engine division of SNECMA Moteurs. A barotropic state law is proposed to model the cavitation phenomenon and this model has been integrated in the commercial CFD code Fine/TurboTM, developed and commercialized by Numeca International. The numerical aspects of the work are mainly focused on numerical stability and reliability of the algorithm, when introducing large density variations through the strongly non linear barotropic state law. This research conducted first to changes in the way preconditioning parameters are calculated. Internal flows in turbomachinery have been deeply investigated. A methodology allowing the numerical simulation of the head drop induced by the development of cavitation has been proposed on the basis of computations in inducers and centrifugal pumps. These simulations have allowed the characterization of the mechanisms leading to the head drop and the visualization of the effects of the development of cavitation on internal flows.

scholarly journals Thermodynamic Effect on a Cavitating Inducer in Liquid Hydrogen

2010 ◽  
Vol 132 (11) ◽  
Author(s):  
Eric Goncalvès ◽  
Regiane Fortes Patella ◽  
Julien Rolland ◽  
Benoit Pouffary ◽  
Guillaume Challier
Keyword(s):  
Fluid Dynamics ◽  
Experimental Data ◽  
Rocket Engine ◽  
Cavitating Flows ◽  
Cavitation Phenomenon ◽  
Space Agency ◽  
Thermodynamic Effect ◽  
Computational Fluid Dynamics Cfd ◽  
T State ◽  
Cryogenic Conditions

This study was led in collaboration with the French Space Agency (CNES) and the Rocket Engine Division of Snecma. The main aims were the simulations and the analyses of cavitating flows in the rocket engine turbopump inducers, where the operating fluids are LH2 and LOx under cryogenic conditions. A ρ(P,T) state law modeling the cavitation phenomenon was integrated by the laboratory LEGI in the commercial computational fluid dynamics (CFD) code FINE/TURBO™, developed by Numeca International. Various 3D numerical results are given for an inducer geometry and comparisons are made with experimental data (head drop curves) obtained by NASA.

scholarly journals Thermodynamic Effect on a Cavitating Inducer in Liquid Hydrogen

2009 ◽  
Author(s):  
Eric Goncalve`s ◽  
Regiane Fortes Patella ◽  
Julien Rolland ◽  
Benoit Pouffary ◽  
Guillaume Challier
Keyword(s):  
Experimental Data ◽  
Rocket Engine ◽  
Liquid Hydrogen ◽  
Numerical Results ◽  
Cavitating Flows ◽  
Cavitation Phenomenon ◽  
Space Agency ◽  
Thermodynamic Effect ◽  
T State ◽  
Cryogenic Conditions

This study was led in collaboration with the French space agency (CNES) and the rocket engine division of Snecma. The main aims were the simulations and the analyses of cavitating flows in the rocket engine turbopump inducers, where the run fluids are LH2 and LOx under cryogenic conditions. A ρ(P,T) state law modeling the cavitation phenomenon was integrated by the laboratory LEGI in the commercial CFD code Fine/Turbo™, developed by Numeca International. Various 3D numerical results are given for an inducer geometry and comparisons are made with experimental data (head drop curves) obtained by NASA.

Characterization of Rotating Cavitation in a High Speed Inducer of Liquid Rocket Engine

2011 ◽  
Vol 320 ◽  
pp. 196-201
Author(s):  
Fei Tang ◽  
Li Jia Wen
Keyword(s):  
High Speed ◽  
High Performance ◽  
Rocket Engine ◽  
Liquid Rocket Engine ◽  
Blade Surface ◽  
Cavitation Phenomenon ◽  
Flow Fluctuations ◽  
Blade Cascade ◽  
Liquid Rocket

Rotating cavitation is one of the most important problems in the development of modern high performance rocket pump inducers. In this paper, a numerical simulation of rotating cavitation phenomenon in a 2D blade cascade of liquid rocket engine inducer was carried out using a mixture model based on Rayleigh-Plesset equation. The purpose is to investigate the characterization of rotating cavitation in a high speed inducer. The results show that when sub-synchronous rotating cavitation occurs, the speed for the length of the blade surface cavitation is lower than the speed frequency of rotation shaft with the same direction. The external aspect is that the pressure at the upstream of blades changes synchronous. Thus, the generation of sub-synchronous rotating cavitation is closely related to the changes of flow angel which caused by the flow fluctuations. Hence, elimination of the flow rate redistribution among the flow channel can effectively suppress the occurrence of this phenomenon.

Numerical Simulation of Offshore Pipeline Installation by Lateral Deflection Procedure

2007 ◽  
Author(s):  
Danilo Machado Lawinscky da Silva ◽  
Rodrigo Almeida Bahiense ◽  
Breno Pinheriro Jacob ◽  
Fernando Gomes da Silva Torres ◽  
Antonio Roberto Medeiros ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Numerical Simulations ◽  
Computational Tool ◽  
Lateral Deflection ◽  
Correct Definition ◽  
Offshore Pipeline ◽  
Definition Of

Conventional offshore pipeline installation operations in Brazil have been performed in an S-Lay procedure employing the BGL-1 barge, owned by Petrobras. However, this procedure has some limits, and may not be feasible in some particular scenarios. Therefore, the objective of this work is to present the numerical simulation of an alternative pipeline installation procedure. This procedure basically consists of performing the pipeline assembly on shore, and deflecting it to the sea using a tug boat. The numerical simulations employ the SITUA-Prosim computational tool, which is able to incorporate the correct definition of the seabed and shore from bathymetric curves. An actual pipeline installation by this lateral deflection procedure is analyzed and discussed. The characterization of the procedure passes through the determination of the better velocity and direction of the tug boat in order to minimize the efforts on the pipeline (especially due to the curvatures).

scholarly journals Numerical modeling of cavitation phenomenon in a two-dimensional converging-diverging nozzle using a homogeneous approach

Mechanik ◽  
2018 ◽  
Vol 91 (7) ◽  
pp. 520-522
Author(s):  
Agnieszka Niedźwiedzka
Keyword(s):  
Numerical Modeling ◽  
Numerical Simulations ◽  
Three Dimensional ◽  
Numerical Calculations ◽  
Planar Geometry ◽  
Experimental Measurements ◽  
Two Dimensional ◽  
Cavitating Flows ◽  
Cavitation Phenomenon ◽  
Fluent Software

The article presents results of numerical simulations of cavitation phenomenon in a converging-diverging nozzle using the homogeneous approach. Three cavitation models are considered: the Schnerr and Sauer model, the Singhal et al. model and the Zwart et al. model. The simulations are performed for transient. The geometry is two-dimensional and planar. In the numerical calculations Fluent software was used. The aim of the work is to estimate the possibility of applying of two-dimensional planar numerical simulations of cavitating flows for small-sized converging-diverging nozzles. The motivation to conduct numerical simulations for two-dimensional and planar geometry are difficulties in obtaining results, which reflect experimental measurements, both for two- and three-dimensional geometry. The achieved results show a big similarity between the results of performed numerical simulations and the material from the experimental measurements for all the analyzed models.

CHARACTERIZATION OF SPLASH-PLATE ATOMIZERS USING NUMERICAL SIMULATIONS

2007 ◽  
Vol 17 (4) ◽  
pp. 347-380 ◽  
Author(s):  
Mohammad P. Fard ◽  
Denise Levesque ◽  
Stuart Morrison ◽  
Nasser Ashgriz ◽  
J. Mostaghimi
Keyword(s):  
Numerical Simulations
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