Results 191 to 200 of about 977 (245)

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

Heat Transfer Coefficients on the Squealer Tip and Near-Tip Regions of a Gas Turbine Blade With Single or Double Squealer

Journal of Turbomachinery, 2003
Detailed heat transfer coefficient distributions on a gas turbine squealer tip blade were measured using a hue detection based transient liquid-crystals technique. The heat transfer coefficients on the shroud and near tip regions of the pressure and suction sides of a blade were also measured.
Jae Su Kwak, Jaeyong Ahn, Je-Chin Han, C. Pang Lee, Robert Boyle, Raymond Gaugler, Ronald S. Bunker   +6 more
openaire   +1 more source

Influences of Squealer Tip Geometrical Characteristics on Tip-leakage Flow in Turbine Rotor

Proceedings of Global Power & Propulsion Society, 2022
Tip-leakage loss caused by tip-leakage flow is an important source of aerodynamic loss in turbine rotor. Squealer tips are often used to control the tip-leakge flow and loss. In this paper, a transonic single-stage high-pressure turbine is simulated numerically to investigate the effects of cavity width and height on tip-leakage flow and loss. Based on
Yufan Wang, Weihao Zhang*, Zhengping Zou, Shoumin Jiang, Zhenzhe Na, Yun Chen   +5 more
openaire   +1 more source

Rotating Effect on Transonic Squealer Tip Cooling Performance

Volume 5A: Heat Transfer, 2017
The aerothermal behavior of turbine blade tip has been studied for decades, mostly using stationary linear cascade. The blade rotation effect still remains unclear to the tip research community. This paper investigates two squealer tip cooling configurations with the effect of relative casing movement. The numerical method was validated against thermal
D. Zhu, S. Lu, H. Ma, Q. Zhang, J. Teng
openaire   +1 more source

Aerodynamic losses for squealer tip with different winglets

Journal of Mechanical Science and Technology, 2019
Aerodynamic loss measurements and flow visualizations have been conducted for a squealer tip with different winglets. The present results for seven winglets indicate that winglet coverage along the pressure side has a negative effect in the loss reduction, whereas winglet coverage along the suction side has a positive effect.
Yong Cheol Seo, Sang Woo Lee
openaire   +1 more source

Squealer Tip Leakage Flow Characteristics in Transonic Condition

Volume 6A: Turbomachinery, 2013
The Over-Tip-Leakage (OTL) flow characteristics for a typical squealer tip of high pressure turbine blade, which consists of subsonic and transonic flow, have been numerically investigated in the present study, in comparison with the corresponding flat tip results. For the squealer tip employed, flow choking behavior still exists above the tip surface,
Wei Li, Hongmei Jiang, Qiang Zhang, Sang Woo Lee   +3 more
openaire   +1 more source

RELATIVE CASING MOTION EFFECT ON SQUEALER TIP COOLING PERFORMANCE AT TIGHT TIP CLEARANCE

Journal of Thermal Science and Engineering Applications, 2020
Abstract The effect of relative motion between the casing and turbine blade tip has been recognized as an important factor for tip aerothermal performance evaluation. Tight tip clearance is becoming one of the main objectives of engine manufacturers.
Jinfang Teng, Shaopeng Lu, Qiang Zhang, Diwei Zhu   +3 more
openaire   +1 more source

Effects of Tip Gap Film Injection From Plain and Squealer Blade Tips

Volume 3: Turbo Expo 2004, 2004
The present study investigates the effect of orthogonal tip gap film injection from a plain and squealer tip of a HPT first stage rotor blade. The pressure ratio (inlet total pressure to exit static pressure) for the cascade used was 1.2, and the experiments were run in a blow-down test rig with a four-blade stationary linear cascade.
Hasan Nasir, Srinath V. Ekkad, Ronald S. Bunker, Chander Prakash   +3 more
openaire   +1 more source

Effects of Impeller Squealer Tip on Centrifugal Compressor Performance

Journal of Engineering for Gas Turbines and Power, 2016
This paper summarizes the main results sorted out from a design of experiment (DoE) based on a validated computational fluid dynamics (CFD). Several tip recessed geometries applied to an unshrouded impeller were considered in conjunction with two tip clearance levels.
Riccardo Da Soghe, Cosimo Bianchini, Lorenzo Toni, Dante Tommaso Rubino   +3 more
openaire   +1 more source

Effects of Squealer Geometry of Turbine Blade Tip on the Tip-Leakage Flow and Loss

Journal of Thermal Science, 2021
The effective control of the tip-leakage flow and loss is of great significance to improve the aerodynamic performance of the turbine. In this paper, the evolution mechanism of tip-leakage flow in a transonic high pressure turbine with a squealer tip is investigated with numerical simulation methods.
Fei Zeng, Weihao Zhang, Yufan Wang, Xia Cao, Zhengping Zou   +4 more
openaire   +1 more source