Entropy generation and exergy destruction in condensing steam flow through turbine blade with surface roughness

H Ding, Y Li, E Lakzian, C Wen, C Wang - Energy Conversion and …, 2019 - Elsevier
In the steam turbine, the wetness loss due to vapor condensation is one of the most crucial
losses at low-pressure stage. This study focused on entropy generation and exergy …

Distributed roughness effects on transitional and turbulent boundary layers

NR Vadlamani, PG Tucker, P Durbin - Flow, Turbulence and Combustion, 2018 - Springer
A numerical investigation is carried out to study the transition of a subsonic boundary layer
on a flat plate with roughness elements distributed over the entire surface. Post-transition …

Dynamics of bypass transition behind roughness element subjected to pulses of free-stream turbulence

A Vaid, NR Vadlamani, AS Malathi, V Gupta - Physics of Fluids, 2022 - pubs.aip.org
This study explores the dynamics of bypass transition of a zero pressure gradient boundary
layer transitioning under the combined influence of an isolated roughness element with …

Effects of forced frequency oscillations and free stream turbulence on the separation-induced transition in pressure gradient dominated flows

A Sengupta, P Tucker - Physics of Fluids, 2020 - pubs.aip.org
The individual and cumulative effects of forced frequency oscillations and free stream
turbulence (FST), on the separation-induced transition caused by an adverse pressure …

Numerical investigation of distributed roughness effects on separated flow transition over a highly loaded compressor blade

M Wang, X Lu, C Yang, S Zhao, Y Zhang - Physics of Fluids, 2021 - pubs.aip.org
Large eddy simulations were conducted to investigate the effects of distributed roughness
on separated flow transitions over a highly loaded compressor blade at a Reynolds number …

Axial turbine aerodynamics for aero-engines

Z Zou, S Wang, H Liu, W Zhang - Springer, Singapore. https://doi. org/10, 2018 - Springer
With the progress of aviation technology, turbine aerodynamic, as one of the major support
subjects for the development of aero-gas turbine, has experienced a rapid development in …

Unsteady non-equilibrium condensation flow of 3-D wet steam stage of steam turbine with roughness using sliding mesh method

H Ding, Y Zhang, C Sun, E Lakzian, C Wen… - International Journal of …, 2022 - Elsevier
This research develops the non-equilibrium condensation model with sliding mesh
technology to solve the unsteady condensing flow inside a 3D wet steam stage of steam …

Surface roughness impact on boundary layer transition and loss mechanisms over a flat-plate under a low-pressure turbine pressure gradient

H Jeong, SJ Song - Journal of turbomachinery, 2022 - asmedigitalcollection.asme.org
An experimental study has been conducted to investigate the effects of surface roughness
on the profile loss of a flat-plate with a contoured wall. All of the measurements have been …

Large eddy simulation for turbines: methodologies, cost and future outlooks

J Tyacke, P Tucker… - Journal of …, 2014 - asmedigitalcollection.asme.org
Flows throughout different zones of turbines have been investigated using large eddy
simulation (LES) and hybrid Reynolds-averaged Navier–Stokes-LES (RANS-LES) methods …

Large eddy simulations in turbines: influence of roughness and free-stream turbulence

VN Rao, R Jefferson-Loveday, PG Tucker… - Flow, turbulence and …, 2014 - Springer
The individual and coupled effects of the incoming free-stream turbulence (FST) and surface
roughness on the transition of a separated shear layer over a flat plate is numerically …