Results 211 to 220 of about 23,531 (251)

The Development and Applications of a Loading Distribution Based Tip Leakage Loss Model for Unshrouded Gas Turbines

Journal of Turbomachinery, 2020
Abstract The prediction of tip leakage flow aerothermal loss plays a crucial role in turbine preliminary design, which strongly affects the turbine performance. A new tip leakage loss model for unshrouded turbine is developed in this paper, considering the compressible flow aerothermal process inside the clearance.
Weihao Zhang, Zhengping Zou, Zhang Weihao   +2 more
exaly   +2 more sources

Novel wave-shaped tip-shroud contours towards reducing turbine leakage loss

Energy, 2022
Xinqian Zheng
exaly   +2 more sources

Tip Leakage Losses in Subsonic and Transonic Blade-Rows

Volume 7: Turbomachinery, Parts A, B, and C, 2011
In 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, Theodosios Korakianitis, Shashimal Banneheke   +2 more
openaire   +2 more sources

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

Improvement of Tip Leakage Loss Model for Axial Turbines

Journal of Turbomachinery, 1997
Tip leakage has a significant effect on the aerodynamic and thermal performance of gas turbines. Losses from the leakage flow often account for as much as one third of the total loss through a turbine stage. Among the recent experimental studies, Bindon (1989) measured the flow field in the tip gap and the subsequent mixing region in a linear cascade ...
Chung, MK Chung, Myung-Kyoon, Kim, BN Kim, Byung-Nam   +1 more
openaire   +1 more source

Effects of inclined squealer rims on tip leakage vortex and loss in a transonic axial turbine

Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 2022
In this paper, to investigate the effects of inclined squealer rims on tip leakage flow and loss, numerical simulations have been performed on a transonic high-pressure turbine. Based on the geometry of prototype with conventional cavity tip, six modifications with different inclined rims are constructed.
Yufan Wang, Weihao Zhang, Yumo Mu, Shoumin Jiang, Yun Chen, Guangjian Ma   +5 more
openaire   +1 more source

Tip leakage flow behavior and loss characteristics of turbine blade squealer tip with inclined shelf and partition rib

Aerospace Science and Technology
Yun Jin, Shaopeng Lu
exaly   +2 more sources

Vortical Structures and Loss Mechanism of Tip Leakage Flow In Subsonic and Transonic Turbine Stages

Volume 10B: Turbomachinery — Axial Flow Turbine Aerodynamics; Deposition, Erosion, Fouling, and Icing; Radial Turbomachinery Aerodynamics, 2022
Abstract Aerothermal behavior and performance of turbine blade squealer tip has been extensively studied, but previously mainly confined to very low speed flows. Some recent research efforts have revealed some distinctive tip heat transfer as well as aerodynamic characteristics in a transonic flow, many of which are confined to a linear ...
P. H. Duan, L. He
openaire   +1 more source

Axial Turbine Tip-Leakage Losses at Off-Design Incidences

Volume 5: Turbo Expo 2004, Parts A and B, 2004
The tip-leakage losses in axial turbines with unshrouded rotor blades can account for as much as one third of the total losses. Various effects are influencing the tip-leakage flow and losses. This paper presents results of an experimental investigation concerning off-design incidences.
R. Willinger, H. Haselbacher
openaire   +1 more source

Turbulence Characteristic and Loss of Transonic Turbine Tip Leakage Vortex With Endwall Motion Effect

Volume 10D: Turbomachinery — Multidisciplinary Design Approaches, Optimization, and Uncertainty Quantification; Turbomachinery General Interest; Unsteady Flows in Turbomachinery, 2022
Abstract Tip leakage flow is considered as an essential loss source within unshrouded high-pressure turbines. This work numerically investigated the flow physics associated with the prediction of the tip leakage loss in a transonic turbine cascade at a high Reynolds number.
Kai Zhou, Chao Zhou
openaire   +1 more source