Results 191 to 200 of about 1,629 (225)

RANS investigation of incoming vortex on the tip leakage vortex breakdown in an aspirated compressor cascade

International Journal of Heat and Fluid Flow
Xi Gao, Zhiyuan Cao
exaly   +2 more sources

Numerical Study of Tip Leakage Vortex Around a NACA0009 Hydrofoil

Journal of Fluids Engineering, 2021
Abstract In the tip clearance flow, the dominant vortex is the tip leakage vortex (TLV), which has a significant impact on the hydraulic and cavitation performance of axial flow machineries. In order to reveal the impact mechanism of the gap size on the TLV, gap flows with two gap sizes, i.e., τ=0.2 (2 mm) and τ=1.0 (10 mm), are ...
Zhen Bi, Xueming Shao, Lingxin Zhang
openaire   +1 more source

Tip Leakage and Backflow Vortex Cavitation

2007
In addition to blade surface cavitation, tip leakage and backflow cavitations occur in real inducers. Although most of cavitation instabilities can be explained by considering only blade surface cavitation, these types of cavitation might play an important role especially for the suppression of instabilities.
openaire   +1 more source

Turbulence Within the Tip-Leakage Vortex of an Axial Waterjet Pump

AIAA Journal, 2012
Stereoscopic particle image velocimetry measurements are performed in an optical refractive index matched facility to investigate the evolution of turbulence in the tip region of an axial waterjet pump rotor. Presented analysis of mean flow velocity, vorticity, Reynolds stresses, and turbulence production/transport within the rotor passage focus on the
Wu, H., Miorini, R., Tan, D., Katz, J.
openaire   +2 more sources

Numerical Analysis of a Tip Leakage Vortex in an Axial Flow Fan

Journal of Fluid Machinery, 2004
Three-dimensional vortical flow and separated flow topology near the casing wall in an axial flow fan having two different tip clearances have been investigated by a Reynolds-averaged Navier-Stokes (RANS) flow simulation. The simulation shows that the tip leakage vortex formed close to the leading edge of the blade tip on suction side grows in the ...
Choon-Man Jang, Kwang-Yong Kim
openaire   +1 more source

Vortex Lattice Method Investigation of Tip-Leakage Flow

Journal of Turbomachinery
Abstract The use of a vortex lattice method (VLM) is investigated on a tip-leakage flow single-blade configuration (NACA 0012) for a wide range of tip gaps. The aim is to estimate the circulation of the tip-leakage vortex (TLV) detaching from the blade.
Christophe Montsarrat, Jérôme Boudet
openaire   +1 more source

Characteristics of the Tip Leakage Vortex in a Low-Speed Axial Compressor

AIAA Journal, 2007
The flowfields in the tip region of the rotor passage are investigated from a large-scale low-speed axial compressor test at both the design and near-stall conditions by using stereoscopic particle image velocimetry. The characteristics of the tip leakage vortex (TLV) are analyzed based on the variations of its trajectory, concentration, size ...
Yu Xianjun, Liu Baojie, Jiang Haokang
openaire   +1 more source

An Unstructured RANS Study of Tip-Leakage Vortex Cavitation Inception

Volume 1: Fora, Parts A, B, C, and D, 2003
To study the physics of cavitation inception, a ducted propulsor simulation is developed and extensively validated with experimental results. The numerical method is shown to be in good agreement with experimental measurements made in the vortex. The simulation is used as a tool for investigating the minimum pressure, circulation, and axial/tangential ...
W. H. Brewer, D. L. Marcum, S. D. Jessup, C. Chesnakas, D. G. Hyams, K. Sreenivas   +5 more
openaire   +1 more source

Unsteady Aperiodic Behavior of a Periodically Disturbed Tip-Leakage Vortex

AIAA Journal, 2008
unsteadyperiodicvorticalinflow representativeof anarrayofstator necklace vortices.Thedownstream tip-leakage vortex is disturbed periodically by the vortical inflow shed by those vortex generators. Phase-averaged two-point correlations are measured near the trailing edge of the cascade. The measurement results clearly show that organized, intense, large-
Ruolong Ma, William J. Devenport
openaire   +1 more source

Suppressing tip leakage vortex cavitation via squealer-hole composite tip

Physics of Fluids
Suppressing tip leakage vortex (TLV) cavitation in rotating machinery, such as propellers and turbines, plays a crucial role in reducing hydrodynamic noise, mitigating cavitation erosion, and enhancing operational stability. This study proposes a composite tip structure that integrates squealer rims with jet holes to suppress TLV cavitation in a ...
Yigan Zhang, Zehui Qu, Yonghao Ye, Baiyan He, Huaping Liu   +4 more
openaire   +1 more source