Numerical evaluation of showerhead film cooling aerothermal performance on a first-stage vane

Ravelli, Silvia; Casarsa, Luca; Barigozzi, Giovanna

doi:10.1016/j.ijthermalsci.2019.03.038

Cited by 4 publications

(1 citation statement)

References 22 publications

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“…At present, the numerical simulation methods available for the calculation of the turbulent gas-phase flow field are direct numerical simulation (DNS), 6 large eddy simulation (LES) 7 and the Reynolds averaging method (RANS). 8,9 Since Reynolds averaging (RANS) can solve almost all engineering problems in the Reynolds number range with high reliability and few computational resources, it is widely applied to engineering practice.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of catalyst particle deposition characteristics in a flue gas turbine with an improved particle motion and deposition model

Cai

Yao

Hou

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part A:

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To more accurately understand and predict the deposition behavior of catalyst particles in the flue gas turbine cascade, test and numerical combined study is performed in this paper. Based on the systematic analysis of the deposition process and physical mechanism of the catalyst particles, the traditional DRW model, critical velocity particle deposition model and removal model were corrected with the user defined function custom function and validated with the actual deposition morphology. On this basis, the effects of the particle Stokes number and flue gas parameters on the particle deposition characteristics of the flue gas turbine cascade were detailed investigated. The results show that the revised DRW model, critical velocity and removal model can more accurately predict the deposition location and deposition rate of particles in the turbine cascade. With the increase in the Stokes number of particles, the average particle impact rate on the blade surface gradually increased, while the average deposition rate showed a trend of first increasing and then decreasing. The average deposition rate of particles in the rotor blade surface is roughly twice as high as that in the stator surface. With the increase of the flue gas expansion ratio, the deposition rate of particles less than 3 μm gradually increases, while the deposition rate of particles greater than 3 μm tends to decrease. In addition, the change in the flue gas expansion ratio has no obvious effect on the particle deposition distribution in different size ranges.

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Section: Introductionmentioning

confidence: 99%

Numerical analysis of catalyst particle deposition characteristics in a flue gas turbine with an improved particle motion and deposition model

Cai

Yao

Hou

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part A:

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Investigation and numerical simulation on film cooling performance with an anti-vortex hole design: Influences of diameter ratio

Zhu

Lin

Simon

et al. 2021

International Communications in Heat and Mass Transfer

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Numerical Assessment of Density Ratio and Mainstream Turbulence Effects on Leading-Edge Film Cooling: Heat and Mass Transfer Methods

Ravelli

Abdeh

Barigozzi

2021

Journal of Turbomachinery

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Within the context of leading edge film cooling in a high-pressure turbine vane, the present study is a step forward towards modelling showerhead performance for a baseline geometry (namely 4 staggered rows of cylindrical holes) at engine like conditions, starting from a previous investigation, at low speed flow (exit isentropic Mach number of Ma2is = 0.2), low inlet turbulence intensity of Tu1 = 1.6% and density ratio of DR ∼ 1. Those operating conditions, dictated by experimental constraints, were essential to validate results from delayed detached-eddy simulation (DDES) against off-the-wall measurements of velocity, vorticity and turbulent fluctuations, for the coolant-to-mainstream blowing ratio of BR = 3 (momentum flux ratio of I = 9). Here, the potential of DDES is exploited to predict the aero-thermal features of the flow in the leading edge region at larger density ratio (DR ∼ 1.5) and turbulent mainstream (Tu1 = 13%), while matching either BR or I. The experimental database contains surface measurements of film cooling adiabatic effectiveness obtained by using the pressure sensitive paint (PSP) technique. DDES predictions were computed by means of the species transport model (i.e. mass transfer), for comparison against the conventional thermal method, based on creating a temperature differential between the mainstream and the coolant (i.e. heat transfer). The simulated film cooling performance was found to depend on the method used, thus suggesting that other parameters than DR, BR, I and Tu1 should be taken into account when the goal is matching engine-like conditions.

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Numerical evaluation of showerhead film cooling aerothermal performance on a first-stage vane

Cited by 4 publications

References 22 publications

Numerical analysis of catalyst particle deposition characteristics in a flue gas turbine with an improved particle motion and deposition model

Numerical analysis of catalyst particle deposition characteristics in a flue gas turbine with an improved particle motion and deposition model

Investigation and numerical simulation on film cooling performance with an anti-vortex hole design: Influences of diameter ratio

Numerical Assessment of Density Ratio and Mainstream Turbulence Effects on Leading-Edge Film Cooling: Heat and Mass Transfer Methods

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