Results 81 to 90 of about 845 (119)

Squealer Tip Treatment Design for Axial Compressors

Volume 2A: Turbomachinery, 2020
Abstract End-wall flows are amongst the main sources of losses in the rear stages of a typical multi-stage axial compressor. Reducing the tip leakage losses in the rotor blades and vanes can provide an increased efficiency and stall margin of a given axial compressor stage.
Roger Wells, Rob Miller, Senthil Krishnababu, James Taylor, Giuseppe Bruni   +4 more
openaire   +1 more source

Aerothermal Performance of Axially Varying Winglet-Squealer Blade Tips

Volume 10B: Turbomachinery — Axial Flow Turbine Aerodynamics; Deposition, Erosion, Fouling, and Icing; Radial Turbomachinery Aerodynamics, 2022
Abstract High-pressure turbine blades are usually susceptible to secondary flow losses due to fluid flow between the casing and the blade tip. In this study, we have evaluated the performance of several blade tip designs for different combinations of winglets and squealer geometries towards mitigating tip leakage losses.
Anmol Garg, Nagabhushana Rao Vadlamani, Balaji Srinivasan   +2 more
openaire   +1 more source

Heat Transfer Coefficient on the Squealer Tip and Near Squealer Tip Regions of a Gas Turbine Blade

Heat Transfer, Volume 4, 2002
Detailed heat transfer coefficient distributions on a squealer tip of a gas turbine blade were measured using a hue detection based transient liquid crystals technique. The heat transfer coefficients on the shroud and near tip region of the pressure and suction sides of a blade were also measured.
Jae Su Kwak, Je-Chin Han
openaire   +1 more source

Squealer Tip Heat Transfer With Film Cooling

Volume 4: Heat Transfer, Parts A and B, 2010
Heat transfer coefficients and film cooling effectiveness values were obtained numerically on a film cooled 2-D gas turbine blade tip model featuring a cutback squealer. In addition, pressure distributions were obtained at 50% and 98% spans. The calculations were performed for a single blade with periodic boundary conditions imposed along the two mid ...
Sumanta Acharya, Gregory Kramer, Louis Moreaux, Chiyuki Nakamata   +3 more
openaire   +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

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