Film cooling characteristics of a single round hole at various streamwise angles in a crossflow: Part I effectiveness

Yuen, C.H.N.; Martinez-Botas, Ricardo

doi:10.1016/s0017-9310(02)00274-0

Cited by 104 publications

(68 citation statements)

References 31 publications

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“…For the validation of the turbulence model used, the computational results obtained for the case of cylindrical holes have been verified by the experimental data of Yuen et al [5]. The performance of different hole shapes (Semicylindrical, semi-elliptic and triangular) for film cooling effectiveness has been measured in terms of centerline and spatially averaged adiabatic film cooling effectiveness.…”

Section: Validation -Cylindrical Hole(single)mentioning

confidence: 75%

“…The inclination of the compound angle is varied from 0°to 90°. Validation of the model has bee cylindrical cooling hole with the experimental study of Yuen et al [5].The geom kept in coordination with the literature work so as to achieve better validation re study, three different shaped holes (semi-cylindrical, semi-elliptic and triangular) cross-sectional area of other hole configurations used in this work has been kept sam Fig. 1 shows the computational domain along with the dimensions and the bound the compound angles of the hole shapes while Fig.…”

Section: Computational Modellingmentioning

confidence: 99%

“…The inclination of coolant injection is 30°and pound angle is varied from 0°to 90°. Validation of the model has been done using the results of ical cooling hole with the experimental study of Yuen et al [5].The geometrical conditions have been coordination with the literature work so as to achieve better validation results. In the later part of the hree different shaped holes (semi-cylindrical, semi-elliptic and triangular) have been investigated.…”

Section: A Validation -Cylindrical Hole (Single)mentioning

confidence: 99%

“…They considered a blowing ratio (M) of 0.5 for maximum effectiveness at coolant to freestream DR (Density Ratio) around 1.0. Film cooling effectiveness using a cylindrical hole at an angle of 30°, 60° and 90° was studied by Yuen and Martinez [5]. They considered a hole length of L=4D, the free-stream Reynolds number of 8563 based on the free-stream velocity and hole diameter, and the blowing ratio was varied from 0.33-2.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Hole Shapes, Orientation And Hole Arrangements On Film Cooling Effectiveness

Jindal¹,

Roy²,

Sharma³

2016

International Journal of Aeronautical and Space Sciences

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In this present work, the effect of hole shapes, orientation and hole arrangements on film cooling effectiveness has been carried out. For this work a flat plate has been considered for the computational model. Computational analysis of film cooling effectiveness using different hole shapes with no streamwise inclination has been carried out. Initially, the model with an inclination of 30° has been verified with the experimental data. The validation results are well in agreement with the results taken from literature. Five different hole shapes viz. Cylindrical, Elliptic, Triangular, Semi-Cylindrical and Semi-Elliptic have been compared and validated over a wide range of blowing ratios. The blowing ratios ranged from 0.67 to 1.67. Later, orientation of holes have also been varied along with the number of rows and hole arrangements in rows. The performance of film cooling scheme has been given in terms of centerline and laterally averaged adiabatic effectiveness. Semi-elliptic hole utilizes half of the mass flow as in other hole shapes and gives nominal values of effectiveness. The triangular hole geometry shows higher values of effectiveness than other hole geometries. But when compared on the basis of effectiveness and coolant mass consumption, Semi-elliptic hole came out to give best results.

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Section: Validation -Cylindrical Hole(single)mentioning

confidence: 75%

Section: Computational Modellingmentioning

confidence: 99%

Section: A Validation -Cylindrical Hole (Single)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Hole Shapes, Orientation And Hole Arrangements On Film Cooling Effectiveness

Jindal¹,

Roy²,

Sharma³

2016

International Journal of Aeronautical and Space Sciences

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“…Different injection angles were studied by Goldstein et al [14] and later by Yuen and MartinezBotas [45]. Yuen and Martinez-Botas investigated three injection angles, namely 30, 60 and 90 degrees with seven different blowing ratios from 0.33 to 2.0.…”

Section: Design Variablesmentioning

confidence: 99%

Large Eddy Simulation of an Asymmetric Jet in Crossflow

Folkersma

Bodart

2017

Direct and Large-Eddy Simulation X

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A high fidelity large eddy simulation (LES) of an asymmetric jet in crossflow is performed to study passive scalar mixing. The configuration includes the most relevant physics of a film cooling application. The simulation is validated with an experiment which has exactly the same geometry.The compound angle injection leads to an asymmetric counter-rotating vortex pair (CVP) in which one vortex dominates the other. This CVP is highly responsible for the shape of the jet in the far field. The entrainment of the present jet is calculated and compared with a symmetric jet without a compound angle.The evolution of the turbulent scalar flux is studied by analysing its transport equations. The production term is closely examined because its shape resembles the turbulent scalar flux. In addition, the commonly used algebraic models in Reynoldsaveraged Navier-Stokes (RANS) exploit it. The algebraic models are evaluated and the applicability of the models is further discussed. Tässä työssä tutkitaan passiivisen skalaarin sekoittumista epäsymmetrisessä ristivirtaussuihkussa suurten pyörteiden simuloinnilla (LES). Laskentamalli kuvaa yksinkertaistettua kalvolauhtumisprosessia. Simulointi validoidaan käyttäen mittausdataa samanlaisesta geometriasta.Kallistettu ja käännetty suihku johtaa epäsymmetriseen vastakkain pyörivään pyör-repariin (CVP), jossa toinen pyörre on voimakkaampi kuin toinen. Voimakkaampi pyörre on vastuussa suihkun poikkileikkauksen muodosta kaukana suihkun injektioreiästä. Epäsymmetrisen ristivirtaussuihkun sekoittumista verrataan symmetriseen ristivirtaussuihkuun, jota ei ole käännetty virtaussuuntaan nähden.Turbulentin skalaarivirran kehittymistä analysoidaan tutkimalla sen kuljettumisyhtälöä. Erityisesti tuottotermiin keskitytään, koska sen muoto muistuttaa itse turbulenttia skalaarivirtaa ja tuottotermiä käytetään hyväksi turbulentin skalaarivirran mallintamiseen yleisimmissä algebrallisissa Reynoldsin yhtälöjärjestelmän sulkeumissa. Yleisimpien algebrallisten mallien soveltuvuutta arvioidaan vertaamalla niistä saatuja tuloksia tämän työn simulointituloksiin.iii PREFACE This work was done in ISAE SUPAERO in Toulouse, France. I gratefully acknowledge the financial support from Honeywell and the computational resources from Calmip (EOS) and IDRIS (Turing).First and foremost I would like to thank my supervisor Assistant Professor Julien Bodart for his help and advice during the project. I would also like to thank all the personnel of DAEP for the opportunity and great experience in Toulouse. Additionally, I am grateful to the examiner Professor Hannu Ahlstedt.

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Numerical simulation of film cooling effectiveness on a flat plate

Kanani

Shams

Ebrahimi

et al. 2008

Numerical Methods in Fluids

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SUMMARYNumerical simulation has been conducted to study film cooling effectiveness on a flat plate. Threedimensional geometry was generated and the effects of blowing ratio and geometrical shape were studied. The simulation results show that cooling hole shape affects film cooling effectiveness significantly. The LDSA hole decreases the momentum of jet flow at the exit area of the hole and avoids lift-off phenomenon. Counter-rotating vortex formed downstream of the hole is weaker for the LDSA hole and secondary flow is not powerful enough to disturb the jet flow structure next to the wall. Also the results show that the LDSA hole has a better lateral coverage due to the diffused shape of the hole and has a higher effectiveness value in a wider region on the wall.

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Film cooling characteristics of a single round hole at various streamwise angles in a crossflow: Part I effectiveness

Cited by 104 publications

References 31 publications

Effect of Hole Shapes, Orientation And Hole Arrangements On Film Cooling Effectiveness

Effect of Hole Shapes, Orientation And Hole Arrangements On Film Cooling Effectiveness

Large Eddy Simulation of an Asymmetric Jet in Crossflow

Numerical simulation of film cooling effectiveness on a flat plate

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