Combined effects of blowing ratio and mist diameter with mainstream turbulence intensity in mist-assisted film cooling

Article Thermodynamics

Numerical simulation of two-phase flow: Air-mist film cooling over a flat plate

Anjali Dwivedi et al.

Summary: In this study, the performance of air-mist film cooling was evaluated for different mist concentrations and droplet diameters. The introduction of droplets greatly improved the cooling effectiveness.

INTERNATIONAL JOURNAL OF THERMAL SCIENCES (2023)

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Article Thermodynamics

Numerical decoupling of the effect of internal cooling and external film cooling on overall cooling effectiveness

Runzhou Liu et al.

Summary: In modern aero-engine turbine blades, the coolant system can be divided into internal cooling and external film cooling. Analyzing the effects of these cooling parts on the overall cooling effectiveness is crucial for blade design improvement. This study used a numerical decoupling method to investigate the relationship between cooling effectiveness and various cooling parts.

APPLIED THERMAL ENGINEERING (2023)

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Article Mechanics

Effects of combustion on the near-wall turbulence and performance for supersonic hydrogen film cooling using large eddy simulation

Jianfei Wei et al.

Summary: Supersonic film cooling using on-board fuel is an effective method to protect the wall in a scramjet engine from the high heat and momentum transported from the mainstream. The combustion of the injected fuel film alters the turbulent transport behavior in the boundary layer. Large eddy simulations (LES) of the Burrows-Kurkov supersonic combustion experiment reveal the impact of boundary layer combustion on near-wall turbulence and wall fluxes, providing insights for improving engineering computations based on the Reynolds averaged simulation method.

PHYSICS OF FLUIDS (2023)

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Article Engineering, Multidisciplinary

Numerical analysis and design optimization on full coverage film-cooling for turbine guided vane

Mingrui Wang et al.

Summary: Based on numerical simulations, the study analyzed the heat transfer and flow field of a turbine vane to improve film cooling effectiveness. By replacing cylindrical film holes with laidback holes and V-crater holes, the overall cooling effectiveness increased while cascade pressure loss factors remained almost unchanged. Structural adjustments were made to the vane to analyze their effects, resulting in improved cooling performance with minimal increase in pressure loss factors.

ENGINEERING APPLICATIONS OF COMPUTATIONAL FLUID MECHANICS (2022)

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Review Energy & Fuels

Large Eddy Simulation of Film Cooling: A Review

Joon Ahn

Summary: This review paper analyzes and introduces about 70 papers published in the past 20 years on large eddy simulation (LES) of film cooling. It discusses the challenges of numerical instability and generating realistic inflow in LES of film cooling. The main focus is on improving film cooling performance and studying the effect of flow conditions. Turbulence statistics obtained from LES of film cooling are also presented, along with future challenges in this field.

ENERGIES (2022)

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Article Thermodynamics

Effect of Blowing Ratio on Mist-Assisted Air Film Cooling of a Flat Plate: An Experimental Study

Mallikarjuna Rao Pabbisetty et al.

Summary: The mist-assisted air film cooling scheme proposed by Li and Wang in 2006 shows a 26% enhancement in film cooling effectiveness compared to regular air film cooling when 2.1% mist is added. Improved coolant coverage is observed in both streamwise and spanwise directions with mist cooling. The net enhancement of mist-assisted air film cooling decreases as the blowing ratio increases within the range of 0.55-2.58 at a density ratio of 2.2.

JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS (2021)

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Article Engineering, Multidisciplinary

Experimental and CFD analysis on the pressure ratio and entropy increment in a cover-plate pre-swirl system of gas turbine engine

Gaowen Liu et al.

Summary: This study investigates the flow and entropy increment of a pre-swirl system under high-speed test conditions, providing insights into pressure ratio characteristics and loss mechanisms. Experimental results suggest that entropy increment and non-dimensional temperature drop are important factors affecting system performance.

ENGINEERING APPLICATIONS OF COMPUTATIONAL FLUID MECHANICS (2021)

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Article Thermodynamics