scholarly journals Variable Stator Vane Penny Gap Aerodynamic Measurements and Numerical Analysis in an Annular Cascade Wind Tunnel

2020 ◽  
Vol 11 (2) ◽  
pp. 44-55
Author(s):  
Daniel Pohl ◽  
Johannes Janssen ◽  
Peter Jeschke ◽  
Alexander Halcoussis ◽  
Hannes Wolf
Keyword(s):  
Numerical Analysis ◽  
Wind Tunnel ◽  
Stator Vane ◽  
Annular Cascade ◽  
Variable Stator

Effect of an Axially Tilted Variable Stator Vane Platform on Penny Cavity and Main Flow

2021 ◽  
Author(s):  
Johannes Janssen ◽  
Daniel Pohl ◽  
Peter Jeschke ◽  
Alexander Halcoussis ◽  
Rainer Hain ◽  
...  
Keyword(s):  
Wind Tunnel ◽  
Flow Region ◽  
Cavity Flow ◽  
Main Flow ◽  
Pressure Probe ◽  
Stator Vane ◽  
Cfd Analyses ◽  
Annular Cascade ◽  
The Impact ◽  
Variable Stator

Abstract This paper presents the impact of an axially tilted variable stator vane platform on penny cavity flow and passage flow, with the aid of both optical and pneumatic measurements in an annular cascade wind tunnel as well as steady CFD analyses. Variable stator vanes (VSVs) in axial compressors require a clearance from the endwalls. This means that penny cavities around the vane platform are inevitable. Production and assembly deviations can result in a vane platform which is tilted about the circumferential axis. Due to this deformation, backward facing steps occur on the platform edge. Penny cavity and main flow in geometries with and without platform tilting were compared in an annular cascade wind tunnel, which comprises a single row of 30 VSVs. Detailed particle image velocimetry (PIV) measurements were conducted inside the penny cavity and in the vane passage. Steady pressure and velocity data was obtained by two-dimensional multi-hole pressure probe traverses in the inflow and the outflow. Furthermore, pneumatic measurements were carried out using pressure taps inside the penny cavity. Additionally, oil flow visualization was conducted on the airfoil, hub, and penny cavity surfaces. Steady CFD simulations with boundary conditions, according to the measurements, have been benchmarked against experimental data. The results show that tilting the VSV platform reduces the mass flow into and out of the penny cavity. By decreasing penny cavity leakage, platform tilting also affects the passage flow where it leads to a reduced turbulence level and total pressure loss in the leakage flow region. In summary, the paper demonstrates the influence of penny platform tilting on cavity flow and passage flow and provides new insights into the mechanisms of penny cavity-associated losses.

EFFECT OF AN AXIALLY TILTED VARIABLE STATOR VANE PLATFORM ON PENNY CAVITY AND MAIN FLOW

2021 ◽  
pp. 1-20
Author(s):  
Johannes Janssen ◽  
Daniel Pohl ◽  
Peter Jeschke ◽  
Alexander Halcoussis ◽  
Rainer Hain ◽  
...  
Keyword(s):  
Wind Tunnel ◽  
Flow Region ◽  
Cavity Flow ◽  
Main Flow ◽  
Pressure Probe ◽  
Stator Vane ◽  
Cfd Analyses ◽  
Annular Cascade ◽  
The Impact ◽  
Variable Stator

Abstract This paper presents the impact of an axially tilted variable stator vane platform on penny cavity flow and passage flow, with the aid of both optical and pneumatic measurements in an annular cascade wind tunnel as well as steady CFD analyses. Variable stator vanes in axial compressors require a clearance from the endwalls. This means that penny cavities around the vane platform are inevitable. Production and assembly deviations can result in a vane platform which is tilted about the circumferential axis.. Penny cavity and main flow in geometries with and without platform tilting were compared in an annular cascade wind tunnel. Detailed particle image velocimetry measurements were conducted inside the penny cavity and in the vane passage. Steady pressure and velocity data was obtained by two-dimensional multi-hole pressure probe traverses in the inflow and the outflow. Furthermore, pneumatic measurements were carried out using pressure taps inside the penny cavity. Additionally, oil flow visualization was conducted on the airfoil, hub, and penny cavity surfaces. Steady CFD simulations have been benchmarked against experimental data. The results show that tilting the vane platform reduces the penny cavity leakage mass flow. By decreasing penny cavity leakage, platform tilting also affects the passage flow where it leads to a reduced turbulence level and total pressure loss in the leakage flow region. In summary, the paper demonstrates the influence of penny platform tilting on cavity flow and passage flow and provides new insights into the mechanisms of penny cavity-associated losses.

scholarly journals Numerical Analysis of Hydrogen Dispersion in Wind Tunnel Modeled on Vehicle Space of Pure Car Carriers

2017 ◽  
Vol 52 (4) ◽  
pp. 520-528
Author(s):  
Hideyuki Oka ◽  
Yuji Ogata ◽  
Yasushi Oka ◽  
Susumu Ota
Keyword(s):  
Numerical Analysis ◽  
Wind Tunnel

Numerical analysis of the influence of three turbulence models on the prediction of the airflow inside at a low-speed wind tunnel.

2015 ◽  
Author(s):  
Guilherme Loyola França de Vasconcellos ◽  
Caio Dell'Oro de Oliveira ◽  
Antônio Augusto Mesquita Diniz ◽  
Sérgio de Morais Hanriot ◽  
Cristiana Brasil Maia
Keyword(s):  
Numerical Analysis ◽  
Wind Tunnel ◽  
Turbulence Models ◽  
Low Speed ◽  
Low Speed Wind Tunnel

Numerical analysis of the influence of the dimensions of the spires in an atmospheric boundary layer wind tunnel

2015 ◽  
Author(s):  
Luiz Fernando Ribeiro Ledo ◽  
Júlio César Xavier Ribeiro ◽  
Sérgio de Morais Hanriot ◽  
Cristiana Brasil Maia
Keyword(s):  
Boundary Layer ◽  
Numerical Analysis ◽  
Wind Tunnel ◽  
Atmospheric Boundary Layer
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