Tip Leakage Flow and Heat Transfer on Turbine Blade Tip and Casing, Part 1: Effect of Tip Clearance Height and Rotation Speed

Rahman, M. Hamidur; Kim, Sung In; Hassan, Ibrahim

doi:10.1080/15502287.2012.725800

Cited by 10 publications

(4 citation statements)

References 16 publications

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“…In the earlier studies (Rahman et al, 2010(Rahman et al, , 2013Kim et al 2012), grid sensitivity and validations and steady analysis of tip leakage flow structures and heat transfer distributions have been investigated. Also, the effect of tip clearance heights and rotor speeds on tip leakage flow and heat transfer rate was systematically analyzed.…”

Section: Umentioning

confidence: 99%

Tip Leakage Flow and Heat Transfer on Turbine Stage Tip and Casing: Effect of Unsteady Stator–rotor Interactions

Rahman

Kim

Hassan

2014

Int. J. Comput. Methods

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Section: Umentioning

confidence: 99%

Tip Leakage Flow and Heat Transfer on Turbine Stage Tip and Casing: Effect of Unsteady Stator–rotor Interactions

Rahman

Kim

Hassan

2014

Int. J. Comput. Methods

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“…On the other hand, at a higher clearance of 6.9%, there was no considerable effect of the shroud motion on the tip leakage mass flow rate. Hamidur et al 24 numerically studied the effect of shroud motion on the blade tip heat transfer at transonic speed. They reported that the region of critical HTC shifts towards the trailing edge with the shroud motion due to the change in inflow angle.…”

Section: Introductionmentioning

confidence: 99%

Blade tip leakage flow and heat transfer characteristics over a gas turbine blade at subsonic and transonic exit conditions

Dipendrasingh,

MVV,

2023

Proceedings of the Institution of Mechanical Engineers, Part G:

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The present study numerically investigates the blade tip leakage flow (TLF) over a gas turbine blade cascade at low speed ( M ex = 0.1) and transonic ( M ex = 0.92) blade exit Mach numbers, with and without shroud motion. Various blade tip flow phenomena like flow separation and reattachment, flow choking, shock-boundary layer interaction (SBLI), and tip leakage vortex (TLV) are studied, and their influence on the heat transfer coefficient (HTC) distributions over the blade tip and near tip blade suction surface is investigated. The study has found some new zones of heat transfer due to the interaction of horseshoe vortices (HSV) with the blade tip. In addition to the primary TLV, a secondary TLV is formed, which increases near tip blade suction surface heat transfer. The flow transitions to supersonic speed in the aft portion of the blade tip for the transonic case resulting in complex heat transfer distribution due to SBLI, compared to near-uniform distribution for the low speed case. This supersonic flow results in a smaller flow separation zone near the aft portion of the pressure side tip edge for the transonic case compared to the low speed case. The qualitative nature of HTC near the leading edge of the blade tip resembles for low speed and transonic cases. However, near the trailing edge of the blade tip, the qualitative nature of HTC for the transonic case shows a substantial difference due to supersonic flow compared to the low speed case.

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“…An extensive review of the research work conducted on fluid flow in the passage and immediate downstream of compressor linear cascade and axial pump was published by Muthanna and Devenport, 27 Many researchers are continuing efforts to characterize the physics of this complex flow field developed due to the tip gap. [28][29][30][31][32] Khan and Tay 33 experimentally investigated the effects of tip gap on upstream flow structure for static blunt bodies in a water tunnel facility. The experimental setup consisted of square and circular cross-section blunt bodies mounted over a flat plate with varying tip gap clearance.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional numerical modeling of flow upstream of a symmetric streamlined body mounted over a flat plate with tip gap

Khan

Arshed

Khan

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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In this research activity numerical simulations are carried out to investigate the flow field upstream of a symmetric streamlined body mounted perpendicular to a flat plate with and without clearance gap between the tip of the streamlined body and the flat plate with laminar boundary layer. The developed numerical model successfully predicted the three-dimensional horseshoe vortex system upstream of the streamlined body with and without the tip gap. The resulting vortex system for the configuration with tip gap contains multiple vortices with characteristics similar to that of end-wall-flows of surface-mounted obstacles. The effects of varying tip gap clearance for various values of free stream Reynolds number are also investigated. It was found that the introduction of a gap between the streamlined body tip and flat surface caused shifting of the vortex structure system in the upstream direction. Moreover, it is observed that the free stream Reynolds number and the tip gap between the streamlined body and the flat plate substantially influences the unsteady character of the flow field and the vortex system structure. Results obtained from the numerical simulations are compared with experimental measurements of a blunt body configuration and have been found in good agreement.

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Tip Leakage Flow and Heat Transfer on Turbine Blade Tip and Casing, Part 1: Effect of Tip Clearance Height and Rotation Speed

Cited by 10 publications

References 16 publications

Tip Leakage Flow and Heat Transfer on Turbine Stage Tip and Casing: Effect of Unsteady Stator–rotor Interactions

Tip Leakage Flow and Heat Transfer on Turbine Stage Tip and Casing: Effect of Unsteady Stator–rotor Interactions

Blade tip leakage flow and heat transfer characteristics over a gas turbine blade at subsonic and transonic exit conditions

Three-dimensional numerical modeling of flow upstream of a symmetric streamlined body mounted over a flat plate with tip gap

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