Concept development for the experimental investigation of forced convection heat transfer in circumferential cavities with variable geometry

Spura, David; Lueckert, Jasmin; Schoene, Sophie; Gampe, Uwe

doi:10.1016/j.ijthermalsci.2014.08.018

Cited by 7 publications

(4 citation statements)

References 30 publications

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“…The axial width of the cavity was 130 mm and the inlet width was 30 mm . Other dimensions of the cavity are presented in Spura et al (2015). Distribution of the thermal conductivity in domain Ω is shown in Figure 6, and its values are given in Table I.…”

Section: Results Of Numerical Calculationmentioning

confidence: 99%

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Determination of heat transfer coefficient in a T-shaped cavity by means of solving the inverse heat conduction problem

Frąckowiak

Spura

Gampe

et al. 2019

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Purpose T-shaped cavities occur by design in many technical applications. An example of such a stator cavity is the side space between the guide vane carriers and the outer casing of a steam turbine. Thermal conditions inside it have a significant impact on the deformation of the turbine casing. In order to improve its prediction, the purpose of this paper is to provide a methodology to gain better knowledge of the local heat transfer at the cavity boundaries based on experimental results. Design/methodology/approach To determine the heat transfer coefficient distribution inside a model cavity with the help of a scaled generic test rig, an inverse heat conduction problem is posed and a method for solving such type of problems in the form of linear combinations of Trefftz functions is presented. Findings The results of the calculations are compared with another inverse method using first-order gradient optimization technique as well as with estimated values obtained with an analytic two-dimensional thermal network model, and they show an excellent agreement. The calculation procedure is proved to be numerically stable for different degrees of complexity of the sought boundary conditions. Originality/value This paper provides a universal and robust methodology for the fast direct determination of an arbitrary distribution of heat transfer coefficients based on material temperature measurements spread over the confining wall.

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Section: Results Of Numerical Calculationmentioning

confidence: 99%

“…Better knowledge of the heat transfer conditions in stator side spaces of steam turbines (Figure 1) is needed for a more precise prediction of thermal casing distortions with finite element analysis (Spura et al , 2015).…”

Section: Introductionmentioning

confidence: 99%

Determination of heat transfer coefficient in a T-shaped cavity by means of solving the inverse heat conduction problem

Frąckowiak

Spura

Gampe

et al. 2019

HFF

Self Cite

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“…This proves that acoustic waves can be applied to achieve an improvement in the heat transfer conditions. A test rig concept to investigate convection heat transfer in cavities was presented by Spura et al (2015) and investigation of forced convection heat transfer in scaled generic models of steam turbine casing side spaces with varied geometric dimensions under fully turbulent air flow was presented by Spura et al (2018).…”

Section: Introductionmentioning

confidence: 99%

Influence of duct parameters on the acoustic wave generation

Rulik

Wróblewski

Rusin

et al. 2019

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Purpose This paper aims to determine the influence of geometrical features of the channel on the acoustic wave generation in a ducted cavity. The analysis is focussed on the effects of the change in the entrance length upstream the cavity and the height. The study is supposed to investigate boundary layer and acoustic wave parameters, and an attempt will be made to determine the correlation between the geometrical dimension and those parameters. Design/methodology/approach Analysis is conducted with the aim of a computational fluid dynamics (CFD) tool and selected results are validated with experimental investigations. The influence of grid resolution and time discretization is analysed. Four different entrance lengths and height are investigated. Qualitative and quantitative comparison between cases is presented. Findings The investigations prove the small influence of the entrance length on acoustic wave generation, but channel height due to wave reflection and interference inside of the cavity has a significant impact on wave frequency and sound pressure level. Channel height has also impact on generation and shape of the vortex created in the cavity inlet. Originality/value The paper extends the knowledge of phenomena taking place in the ducted cavities. Results obtained from these investigations will be useful in designing new cooling techniques and in noise reduction. The CFD analysis makes it possible to determine the correlations between channel dimensions and SPL function and frequency of sound waves.

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“…These examples pertain open flows. Besides, this type of flow occurs in many parts of a gas or steam turbine blade system such as labyrinth seals or rim seals applied between stator and rotor [4,5] and spaces between guiding vanes and turbine casing resulting from its modular construction [12]. Another example is flame stabilizer applied in the ramjet engines.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical studies of sound generated by cavities

et al. 2019

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Cavities and gaps are an important element in the construction of many devices and machines, including energy sector applications. This type of flow is usually coupled with strong pressure fluctuations inside the cavity, which are emitted into the far field in the form of a sound wave responsible for the noise generation. This applies to both subsonic and supersonic flows. Pressure fluctuations often have the character of single tones of a specific frequency and high amplitude and their generation is associated with a vortex shedding formed directly above the inlet and its interaction with the walls of the cavity. The presented work include description of developed test stand and applied measurement techniques dedicated to the analysis of high frequency phenomena. In addition, the adopted numerical model will be described, including conducted two-dimensional and three-dimensional analysis. The developed models will be validated based on experimental measurements concerning wide range of flow conditions.

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Concept development for the experimental investigation of forced convection heat transfer in circumferential cavities with variable geometry

Cited by 7 publications

References 30 publications

Determination of heat transfer coefficient in a T-shaped cavity by means of solving the inverse heat conduction problem

Determination of heat transfer coefficient in a T-shaped cavity by means of solving the inverse heat conduction problem

Influence of duct parameters on the acoustic wave generation

Experimental and numerical studies of sound generated by cavities

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