Results 281 to 290 of about 1,041,715 (351)

Effects of Clearance and Operating Conditions On Tip Leakage Vortex-induced Energy Loss in an Axial-Flow Pump Using Entropy Production Method

Journal of Fluids Engineering, 2022
Tip leakage flow (TLF) is a typical flow phenomenon in the internal flow of axial-flow pumps that has a serious impact on their safety and stability.
K. Kan, Haoyu Li, Huixiang Chen, Hui Xu, Yan Gong, Tianyi Li, Lian Shen   +6 more
semanticscholar   +1 more source

Analysis of Tip Leakage Flow Unsteadiness in a Transonic Turbine Cascade using Data-driven Modal Decomposition Methods

The Physics of Fluids, 2022
This paper presents a novel characterization of the unsteady dynamics of turbine tip flow using two kinds of modal decomposition methods, which are applied to hybrid RANS (Reynolds Averaged Navier-Stokes)/LES (Large Eddy Simulation) simulation data at a ...
Yi Yang, Hongwei Ma
semanticscholar   +1 more source

Effect of arbitrary blade tip design on tip leakage flow

Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 2019
Tip 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, Yanping Song, Jianyang Yu, Fu Chen   +3 more
openaire   +1 more source

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, William Devenport, Josh Staubs   +2 more
openaire   +1 more source

Investigation of Tip Leakage Vortex Breakdown in a High-Speed Multistage Axial Compressor

Volume 10A: Turbomachinery — Axial Flow Fan and Compressor Aerodynamics, 2022
In this paper, an unsteady tip leakage flow instability is identified and investigated for an axial compressor at near surge conditions. We describe the results of experimental verification of a new compressor developed by improving the blade geometry ...
R. Seki, Toshihiko Azuma, Junji Iwatani, Akihiro Nakaniwa, Hidetaka Okui, T. Shibata   +5 more
semanticscholar   +1 more source

Tip leakage aerodynamics over stepped squealer tips in a turbine cascade

Experimental Thermal and Fluid Science, 2011
Abstract 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, Sang Woo Lee, Ho Sang Kwak   +2 more
openaire   +1 more source

Energy dissipation mechanism of tip-leakage cavitation in mixed-flow pump blades

The Physics of Fluids
Tip leakage flow is one of the significant factors influencing the internal flow stability of mixed-flow pumps, and in severe cases, it can lead to channel blockage and energy loss.
Wei Li, Haoming Li, Mingjiang Liu, Leilei Ji, Ramesh K. Agarwal, Shengyang Jin   +5 more
semanticscholar   +1 more source

Basic Analysis of Tip Leakage Mixing Loss

Volume 6: Turbo Expo 2007, Parts A and B, 2007
A 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
openaire   +1 more source

Numerical study on effect of design parameters of the single-circumferential groove on tip leakage flow reduction in a transonic turbine

The Physics of Fluids
In order to investigate the impact of design parameters (depth, width, and location) of the single-circumferential groove (SCG) on tip leakage flow (TLF) reduction in a transonic turbine stage, a systematic investigation was conducted by high-precision ...
Xuyang Shi, Yanhui Wu, Haohua Li, Ziliang Li   +3 more
semanticscholar   +1 more source

PIV Measurements of a Tip Leakage Vortex

SNAME 26th American Towing Tank Conference, 2001
The 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, Ghanem F. Oweis, Steven L. Ceccio, Stuart D. Jessup, Christopher J. Chesnakas, David J. Fry   +5 more
openaire   +1 more source