Description of the flow in a linear cascade with an upstream cavity Part 1: Influence of turbulence (draft)

Fiore, Maxime; Gourdain, Nicolas; Boussuge, Jean‐François; Lippinois, Eric

doi:10.1016/j.compfluid.2019.104361

Cited by 4 publications

(3 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The occurrence of the boundary layer separation and the formation of the vortexes constantly convert the useful mechanical energy of mainstream into the useless friction heat, and the total flow losses increase in the valve cavities. 23 Especially, for the vortex B behind the cores, part of the fluid has a large negative axial velocity and the gas phase is easily gathered and retained in this region. The same phenomenon can be observed in the experiment.…”

Section: Resultsmentioning

confidence: 99%

Numerical and experimental studies of gas–liquid flow and pressure drop in multiphase pump valves

Zhang

Luo

2020

Science Progress

View full text Add to dashboard Cite

A numerical and experimental study was carried out to investigate the two-phase flow fields of the typical three valves used in the multiphase pumps. Under the gas volume fraction conditions in the range of 0%–100%, the three-dimensional steady and dynamic two-phase flow characteristics, pressure drops, and their multipliers of the ball valve, cone valve, and disk valve were studied, respectively, using Eulerian–Eulerian approach and dynamic grid technique in ANSYS FLUENT. In addition, a valve test system was built to verify the simulated results by the particle image velocimetry and pressure test. The flow coefficient CQ (about 0.989) of the disk valve is greater than those of the other valves (about 0.864) under the steady flow with a high Reynolds number. The two-phase pressure drops of the three valves fluctuate in different forms with the vibration of the cores during the dynamic opening. The two-phase multipliers of the fully opened ball valve are consistent with the predicted values of the Morris model, while those of the cone valve and disk valve had the smallest differences with the predicted values of the Chisholm model. Through the comprehensive analysis of the flow performance, pressure drop, and dynamic stability of the three pump valves, the disk valve is found to be more suitable for the multiphase pumps due to its smaller axial space, resistance loss, and better flow capacity.

show abstract

Section: Resultsmentioning

confidence: 99%

Numerical and experimental studies of gas–liquid flow and pressure drop in multiphase pump valves

Zhang

Luo

2020

Science Progress

View full text Add to dashboard Cite

show abstract

“…According to Sagaut and Cambon [2008] and used by Fiore et al [2020], the time evolution of the turbulent kinetic energy can be written as:…”

Section: Methods To Account For the External Turbulence In Zdesmentioning

confidence: 99%

“…If not modelled, the turbulence can be partly resolved for a higher level of accuracy (Large Eddy Simulations approaches) but at the expense of a much larger computational cost. In turbine flows, Wall-Resolved LES (WRLES) is often prefered because the turbulence in the boundary layer is essentially resolved (Fiore et al [2020]) and not modelled as in Wall-Modeled LES approaches. However, the numerical cost of WRLES is high because of the mesh required in the boundary layer.…”

Section: Introductionmentioning

confidence: 99%

Assessment of an Hybrid RANS/LES Approach for the Prediction of Aerodynamic Losses on a Linear Cascade of Turbine Blades with Free-Stream Turbulence

François,

Gand

2023

European Conference on Turbomachinery Fluid Dynamics and Thermodynamics

View full text Add to dashboard Cite

Turbine blades are highly aerodynamically loaded, which leads to secondary flows in the vicinity of the hub/shroud walls. These secondary flows are the cause of significant aerodynamic losses in the turbine row, that need to be accurately predicted by the design engineer. Also, turbine rows operate in a flow with a high intensity of free-stream turbulence. Predicting such flows is quite challenging for RANS models that may lack accuracy. In the present work, a hybrid RANS/LES approach, named Zonal Detached Eddy Simulation, is assessed on a linear cascade of turbine blades submitted to a significant external turbulence. The selected configuration is the MAGPI configuration (Re=560 000) for which measurements are available downstream of the blades and on the blade walls. In this work, both the ZDES approach and the methodology for injecting turbulence are presented. The physical consistency of ZDES solutions is analysed and discussed. Finally, ZDES results are compared to the measurements and with a RANS solution: pressure losses maps downstream of the blade simulated with ZDES show a fair agreement with experiments both in shape and magnitude, while the RANS solution overestimates the pressure losses. The comparison of the pressure distribution on the blade wall near the lower wall (where secondary flows develop) exhibits also a better matching of the ZDES results with the measurements.

show abstract

Aerodynamic and heat transfer performances of a highly loaded transonic turbine rotor with upstream generic rim seal cavity

Mansouri

2021

Propulsion and Power Research

View full text Add to dashboard Cite

Description of the flow in a linear cascade with an upstream cavity Part 1: Influence of turbulence (draft)

Cited by 4 publications

References 29 publications

Numerical and experimental studies of gas–liquid flow and pressure drop in multiphase pump valves

Numerical and experimental studies of gas–liquid flow and pressure drop in multiphase pump valves

Assessment of an Hybrid RANS/LES Approach for the Prediction of Aerodynamic Losses on a Linear Cascade of Turbine Blades with Free-Stream Turbulence

Aerodynamic and heat transfer performances of a highly loaded transonic turbine rotor with upstream generic rim seal cavity

Contact Info

Product

Resources

About