Unsteady Phenomena at the Combustor-Turbine Interface

Shaikh, Faisal; Rosic, Budimir

doi:10.33737/gpps20-tc-150

Cited by 2 publications

(1 citation statement)

References 32 publications

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“…Figure 12 shows a schematic of an aerothermal linear cascade, typically instrumented with thin-film gauges or infra-red thermal cameras. The 3D registration allowed the thermal data to clipped by surface, highlighting the endwall region of interest in the original NGV study by Shaikh (2020).…”

Section: Thermal Camera Registrationmentioning

confidence: 99%

1D analytic and numerical analysis of thin film heat transfer gauges and infra-red cameras in non-planar applications

Baker,

Rosic

2024

J. Glob. Power Propuls. Soc.

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The impulse response method is widely used for heat transfer analysis in turbomachinery applications. Traditionally, the 1D method assumes a: linear time invariant, isotropic, semi-infinite block with planar surfaces and does not accurately model the true geometric behaviour. This paper evaluates the error introduced by the planar assumption and outlines the required modifications for accurate freeform surface analysis. Adapted cylindrical basis functions are defined for the impulse response method and used to evaluate the impact of the 1D planar assumption. The analytic solutions for both convex and concave surfaces are presented. A penta-diagonal algorithm, for a modified numerical Crank-Nicolson scheme, is also evaluated for fast stable implementation of curved geometry simulation. The scheme shows comparable performance to the impulse response, whilst removing the requirement for linear time invariance. The new methods are demonstrated in the case of aerothermal analysis for heat transfer in a turbine nozzle guide vane. A 3D ANSYS simulation is used as a benchmark and further highlights the importance of the curvature effects. The methods are extended using curvature mapping for infra-red camera data, enabling direct 3D thermal simulation or the fast calculation of freeform curvature. This paper defines the methodology to analyse heat transfer measurements on non-planar geometry.

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Section: Thermal Camera Registrationmentioning

confidence: 99%

1D analytic and numerical analysis of thin film heat transfer gauges and infra-red cameras in non-planar applications

Baker,

Rosic

2024

J. Glob. Power Propuls. Soc.

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A New Experimental Approach for Heat Transfer Coefficient and Adiabatic Wall Temperature Measurements on a Nozzle Guide Vane With Inlet Temperature Distortions

Bacci

Picchi

Facchini

et al. 2021

Journal of Turbomachinery

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Modern gas turbines lean combustors are used to limit NOx pollutant emissions; on the other hand, their adoption presents other challenges, especially concerning the combustor-turbine interaction. Turbine inlet conditions are generally characterized by severe temperature distortions and swirl degree, which is responsible for very high turbulence intensities. Past studies have focused on the description of the effects of these phenomena on the behavior of the high pressure turbine. Nevertheless, very limited experimental results are available when it comes to evaluate the heat transfer coefficient (HTC) on the nozzle guide vane surface, since relevant temperature distortions present a severe challenge for the commonly adopted measurement techniques. The work presented in this paper was carried out on a non-reactive, annular, three-sector rig, made by a combustor simulator and a NGV cascade. It can reproduce a swirling flow, with temperature distortions at the combustor-turbine interface plane. This test apparatus was exploited to develop an experimental approach to retrieve heat transfer coefficient and adiabatic wall temperature distributions simultaneously, to overcome the known limitations imposed by temperature gradients on state-of-the-art methods for HTC calculation from transient tests. A non-cooled mockup of a NGV doublet, manufactured using low thermal diffusivity plastic material, was used for the tests, carried out using IR thermography with a transient approach. In the authors' knowledge, this presents the first experimental attempt of measuring a nozzle guide vane heat transfer coefficient in the presence of relevant temperature distortions and swirl.

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Unsteady Phenomena at the Combustor-Turbine Interface

Cited by 2 publications

References 32 publications

1D analytic and numerical analysis of thin film heat transfer gauges and infra-red cameras in non-planar applications

1D analytic and numerical analysis of thin film heat transfer gauges and infra-red cameras in non-planar applications

A New Experimental Approach for Heat Transfer Coefficient and Adiabatic Wall Temperature Measurements on a Nozzle Guide Vane With Inlet Temperature Distortions

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