Results 201 to 210 of about 977 (245)

Turbine Blade Tip Leakage Flow Control by Partial Squealer Tip and Plasma Actuators

44th AIAA Aerospace Sciences Meeting and Exhibit, 2006
In order to further the understanding of turbine tip leakage and passage ∞ow mechanisms for undesirable entropy production, an experiment was conducted in a linear cascade at the Hessert Laboratory. Blade surface and tip endwall static pressure, total pressure loss, and wake vorticity measurements were taken to document the efiects of upstream axial ...
Travis Douville, Julia Stephens, Thomas Corke, Scott Morris   +3 more
openaire   +1 more source

Aeromechanical Optimization of a Winglet-Squealer Tip for an Axial Turbine

Journal of Turbomachinery, 2010
The possibility of reducing the over tip leakage loss of unshrouded axial turbine rotors has been investigated in an experiment using a linear cascade of turbine blades and by using CFD. A numerical optimization of a winglet-squealer geometry was performed. The optimization involved the structural analysis alongside the CFD.
Zbigniew Schabowski, Howard Hodson, Davide Giacche, Bronwyn Power, Mark R. Stokes   +4 more
openaire   +1 more source

Flow Investigations in the Tip Gap of Rotor Blade Tips With Squealer Cavity

Volume 6A: Turbomachinery, 2013
The tip leakage flow in turbines is considered to be responsible/or significant machine losses. An efficient reduction of these losses by e. g. squealer cavities at rotor blade tips requires a detailed physical and quantitative understanding of the tip leakage flow.
Andreas Fischer, Jörg König, Jürgen Czarske, Clemens Rakenius, Gregor Schmid, Heinz-Peter Schiffer   +5 more
openaire   +1 more source

Robustness Analysis on the Aerothermal Performance of Turbine Blade Squealer Tip

Journal of Engineering for Gas Turbines and Power, 2022
Abstract An improved efficient uncertainty quantification (UQ) analysis framework is proposed by the combination of sparse polynomial chaos expansion (PCE) and universal Kriging (UK) metamodel to obtain the surrogate model (UK-PCE). Moreover, a challenging analytical test function and an engineering test are considered to investigate the
Ming Huang, Zhigang Li, Jun Li
openaire   +1 more source

Effect of Shelf Squealer Tip Configurations on Film Cooling Effectiveness

Volume 5C: Heat Transfer, 2018
Film cooling effectiveness and heat transfer were measured in squealer tip configurations on the blade tip surface. Three different shelf squealer tip geometries were studied: conventional, vertical, and inclined. The experiment was carried out in a wind tunnel with an inlet mainstream Reynolds number, based on the axial chord length of the blade, of ...
JeongJu Kim, Wonjik Seo, Minho Bang, Seon Ho Kim, Seok Min Choi, Hyung Hee Cho   +5 more
openaire   +1 more source

Effect of Common Blade Tip Squealer Designs in Terms of Tip Clearance Loss Control

ASME 2013 Turbine Blade Tip Symposium, 2013
The increase of new gas turbine’s efficiency is connected with further rise of turbine inlet temperature and sometimes as well pressure. In these conditions, first cooled turbine stages of a gas turbine engine usually consist of freestanding airfoils, which do not use an integrated shroud, to avoid risk of shroud overheating. In order to better control
N. Lomakin, A. Granovskiy, V. Belkanov, J. Szwedowicz   +3 more
openaire   +1 more source

Influence of tip clearance and cavity depth on heat transfer in a cutback squealer tip

Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering, 2020
Numerical simulations are conducted to present the aerothermal performance of a turbine blade tip with cutback squealer rim. Two different tip clearance heights (0.5%, 1.0% of the blade span) and three different cavity depths (2.0%, 3.0%, and 6.0% of the blade span) are investigated.
Weijie Wang, Shaopeng Lu, Hongmei Jiang, Qiusheng Deng, Jinfang Teng, Wensheng Yu   +5 more
openaire   +1 more source

Effect of Tip Gap Height on Heat/Mass Transfer over a Cavity Squealer Tip

Journal of Fluid Machinery, 2013
ABSTRACT The effect of tip gap height on heat/mass transfer characteristics on the floor of cavity squealer tip has been investigated in a turbine cascade for power generation by employing the naphthalene sublimation technique. The squealer rim height is chosen to be an optimal one of h st /c = 5.51% for the tip gap height-to-chord ratios of h/c = 1.0,
Dong Bum Kang, Hyun Suk Moon, Sang Woo Lee   +2 more
openaire   +1 more source

Effects of Squealer Width and Height on Aerodynamic Performance of Tip-Leakage Flow of Cavity Tips

Proceedings of Global Power & Propulsion Society, 2022
The scraping vortex (SV) is the dominant flow structure in the cavity tip gap. As the basic geometric parameters, it is of great significance to explore the influence mechanism of the squealer width and height on the evolution of SV. In this study, the influence mechanism of the squealer width and height on the SV evolution and aerodynamic ...
Xiaojuan He, Zhengping Zou
openaire   +1 more source

Comparison of Turbine Tip Leakage Flow for Flat Tip and Squealer Tip Geometries at High-Speed Conditions

Volume 2: Turbo Expo 2004, 2004
The tip leakage flow characteristics for flat and squealer turbine tip geometries are studied in the von Karman Institute Isentropic Light Piston Compression Tube facility, CT-2, at different Reynolds and Mach number conditions for a fixed value of the tip gap in a non-rotating, linear cascade arrangement.
Nicole L. Key, Tony Arts
openaire   +1 more source