Conjugate heat transfer of a rib-roughened internal turbine blade cooling channel using large eddy simulation

Scholl, Sebastian; Verstraete, Tom; Duchaine, Florent; Gicquel, Laurent

doi:10.1016/j.ijheatfluidflow.2016.07.009

Cited by 37 publications

(25 citation statements)

References 37 publications

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“…Moreover, transition and secondary flows may play a considerable role, depending on the Reynolds number. Therefore, the numerical results are very sensitive on the chosen turbulence model [3,4]. Applying this method to the cooling of the compressor backwall involves additional effects, which further complicates the physical situation: the rotation will generate crossflow conditions, and if multiple jets are foreseen, complex horse-shoe vortex systems will develop, with corresponding effects on the single jets and on the shear flow along the wall.…”

Section: Characteristics Of Impingement Jet Coolingmentioning

confidence: 99%

Steady-State Fluid-Solid Mixing Plane to Replace Transient Conjugate Heat Transfer Computations during Design Phase

Hanimann

Mangani

Casartelli

et al. 2021

IJTPP

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The demand for increased turbomachinery performance, both, towards higher pressures and temperatures, leads to high thermal-loads of specific components and can critically affect mechanical integrity. In the particular case of rotating-disk configurations, like the back-side of wheels or in cavities, a very efficient way for cooling is jet impingement. An example for this situation are high pressure-ratio turbochargers, where cooling of the impeller disk (back wall) is introduced to achieve tolerable thermal loads. From the physical point of view, jet impingement on a rotating wall generates an unsteady heat transfer situation. On the other end, accurate values of time-averaged temperatures would be sufficient for design purposes. In general, obtaining circumferentially time-averaged solutions requires transient analysis of the conjugate heat transfer (CHT) process to account for the mean effect of jet cooling on solids. Such analysis is computationally expensive, due to the difference in information propagation time-scale for the solid and the fluid. In this paper, a new approach to directly compute circumferentially time-averaged (i.e., steady-state) temperature distributions for rotating-disk CHT problems is presented based on an adaption of the well known fluid-fluid mixing plane approach.

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Section: Characteristics Of Impingement Jet Coolingmentioning

confidence: 99%

Steady-State Fluid-Solid Mixing Plane to Replace Transient Conjugate Heat Transfer Computations during Design Phase

Hanimann

Mangani

Casartelli

et al. 2021

IJTPP

View full text Add to dashboard Cite

show abstract

“…Consequently, Duchaine [55] highlighted that LES coupling strategies are well-adapted to explore phenomena impossible to capture in RANS. Then, LES studies with CHT have been conducted in combustion chambers, like Jauré [56], and cooling systems with multi-perforated plates have been investigated (Florenciano [57], Scholl [58]). In the field of propulsion in general, Misdariis [59] showed that the CHT could be applied to piston engines, allowing to characterize the knock phenomenon.…”

Section: Coupling Strategymentioning

confidence: 99%

Modeling of Conjugate Heat Transfer in a Kerosene/Air Spray Flame used for Aeronautical Fire Resistance Tests

Boulet

Bénard

Lartigue

et al. 2018

Flow Turbulence Combust

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Airworthiness standards require a fire resistance demonstration for aircraft or helicopter engines to obtain a type certificate. This demonstration relies on tests performed with prototype engine parts in the late stages of the development. In hardest tests, a kerosene standardized flame with imposed burnt gas temperature and heat flux is placed next to the engine casing during a given time. The aim of this work is to provide a better characterization of a kerosene/air certification burner in order to reach a better understanding of the thermal environment during fire tests. To this purpose, Large-Eddy Simulation (LES) of the certification burner is carried out. Spray combustion, forced convection on walls and conduction in the solid parts of the burner are coupled to achieve a detailed description of heat transfer. In a first place, physical aspects involved inside the burner in an adiabatic case are described. Then, differences that exist with a conjugate convective and conductive heat transfer case are analyzed. To a larger extent, the aim is to have a better characterization of the flow impinging the casing and to progress on fire test modeling so as to minimize the risks of test failure.

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“…Furthermore, mechanisms for generating local peaks can be elucidated by observing instantaneous flow and thermal fields [18,19]. For studying the conjugate heat transfer of ribbed channels [14,15], Scholl et al [20,21] performed a LES. The LES predicted that the heat transfer of the channel wall was in good agreement with the experiment, but the heat transfer coefficient at the front edge and back of the rib was higher than those observed in the experiment [20].…”

Section: Introductionmentioning

confidence: 99%

Dependence of Conjugate Heat Transfer in Ribbed Channel on Thermal Conductivity of Channel Wall: An LES Study

2021

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A series of large eddy simulations was conducted to analyze conjugate heat transfer characteristics in a ribbed channel. The cross section of the rib is square and the blockage ratio is 0.1. The pitch between the ribs is 10 times the rib height. The Reynolds number of the channel is 30,000. In the simulations, the effect of the thermal resistance of the solid wall of the channel on convective heat transfer was observed in the turbulent flow regime. The numerical method used was based on the immersed boundary method and the concept of effective conductivity is introduced. When the conductivity ratio between the solid wall and the fluid (K*) exceeded 100, the heat transfer characteristics resembled those for an isothermal wall, and the cold core fluid impinging and flow recirculation mainly influenced the convective heat transfer. For K* ≤ 10, the effect of the cold core fluid impinging became weak and the vortices at the rib corners strongly influenced the convective heat transfer; the heat transfer characteristics were therefore considerably different from those for an isothermal wall. At K* = 100, temperature fluctuations at the upstream edge of the rib reached 2%, and at K* = 1, temperature fluctuations in the solid region were similar to those in the fluid region. The rib promoted heat transfer up to K* = 100, but not for K* ≤ 10. The Biot number based on the channel wall thickness appears to adequately explain the variation of the heat transfer characteristics with K*.

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Conjugate heat transfer of a rib-roughened internal turbine blade cooling channel using large eddy simulation

Cited by 37 publications

References 37 publications

Steady-State Fluid-Solid Mixing Plane to Replace Transient Conjugate Heat Transfer Computations during Design Phase

Steady-State Fluid-Solid Mixing Plane to Replace Transient Conjugate Heat Transfer Computations during Design Phase

Modeling of Conjugate Heat Transfer in a Kerosene/Air Spray Flame used for Aeronautical Fire Resistance Tests

Dependence of Conjugate Heat Transfer in Ribbed Channel on Thermal Conductivity of Channel Wall: An LES Study

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