Results 121 to 130 of about 41,220 (167)
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Effect of arbitrary blade tip design on tip leakage flow
Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 2019Tip geometry modification is frequently used to suppress the tip leakage flow in the turbine cascade however a universally beneficial tip geometry modification design has not been fully discovered. In this paper, the two-surface coupling arbitrary blade tip design method in three-dimensional physical space which satisfies the simple trigonometric ...
Jiahui Jin +3 more
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The Tip Leakage Vortex Shed from an Unsteady Tip Clearance Flow
34th AIAA Fluid Dynamics Conference and Exhibit, 2004*† ‡ , The interaction between the rotor blade tip leakage flow and inflow disturbances, such as encountered in shrouded marine propulsors, was simulated in the Virginia Tech Linear Cascade Wind Tunnel equipped with a moving endwall system. The idealized periodic inflow unsteadiness was generated using vortex generator pairs upstream of the blade row ...
Nanyaporn Intaratep +2 more
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Tip leakage aerodynamics over stepped squealer tips in a turbine cascade
Experimental Thermal and Fluid Science, 2011Abstract Tip gap flow physics and aerodynamic loss generations for two stepped squealer tips of a “Higher Pressure-side rim and Lower Suction-side rim” (HPLS) tip and a “Lower Pressure-side rim and Higher Suction-side rim” (LPHS) tip have been investigated in a turbine cascade.
Seong Eun Lee +2 more
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Basic Analysis of Tip Leakage Mixing Loss
Volume 6: Turbo Expo 2007, Parts A and B, 2007A simple model for tip leakage mixing loss of unshrouded blades for compressible flow is presented. The work draws ideas, is based on the theoretical analysis of the loss by Denton. Relationship for computing the loss is derived, in terms of blade surface static pressure, chordwise distribution of tip clearance, discharge coefficient and total pressure
Weiwei Shao, Lucheng Ji, Ronghui Cheng
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PIV Measurements of a Tip Leakage Vortex
SNAME 26th American Towing Tank Conference, 2001The tip-leakage vortex occurring on a ducted rotor was examined using both three component Laser Doppler Velocimetry (LDV) and planar Particle Imaging Velocimetry (PIV). The vortex strength and core size were examined for different vortex cross sections downstream of the blade trailing edge. The variability of these quantities are observed with PIV and
Carolyn Q. Judge +5 more
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Tip Leakage Flow: Advanced Measurements and Analysis
22nd AIAA/CEAS Aeroacoustics Conference, 2016Advanced measurements of a tip clearance flow are carried out in the large subsonic anechoic wind tunnel of the LMFA in Lyon. The experimental set-up is obtained by placing the airfoil between two plates into the potential core of a turbulent rectangular jet, the upper plate being the hub and the lower the casing.
Jacob, Marc +3 more
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Rotor-Tip Leakage: Part I—Basic Methodology
Journal of Engineering for Power, 1982Blade tip losses represent a major efficiency penalty in a turbine rotor. These losses are presently controlled by maintaining close tolerances on tip clearances. This two-part paper outlines a new methodology for predicting and minimizing tip leakage flows.
T. C. Booth, P. R. Dodge, H. K. Hepworth
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Suppressing tip-leakage vortex cavitation by overhanging grooves
Experiments in Fluids, 2020In the present paper, a new control method for tip-leakage vortex (TLV) cavitation is proposed. This method, which combines the effects of grooves and winglets, is made of overhanging grooves (OHGs) fitted at the tip of a hydrofoil. Experimental and numerical investigations are conducted to evaluate the performances of OHGs in terms of TLV cavitation ...
Huaiyu Cheng +4 more
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Tip Leakage Losses in Subsonic and Transonic Blade-Rows
Volume 7: Turbomachinery, Parts A, B, and C, 2011In this paper the effect of blade-exit Mach number on unshrouded turbine tip-leakage flows is investigated. Previously published experimental data of a high-pressure turbine blade are used to validate a CFD code, which is then used to study the tip-leakage flow at blade-exit Mach numbers from 0.6 to 1.4.
Andrew P. S. Wheeler +2 more
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Control of Tip Leakage Vortex Breakdown by Tip Injection in Unshrouded Turbines
Journal of Propulsion and Power, 2014Tip leakage flow is responsible for a number of aerodynamic losses in turbines, but the leakage loss mechanisms have not been fully elucidated yet. This paper computationally investigates the effects of tip injection on tip leakage vortex dynamics in an unshrouded turbine, in an attempt to seek new loss generation mechanisms in turbine tip clearance ...
Jie Gao +3 more
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