Optimization of film hole row locations of a nozzle guide vane using network approach

Kukutla, Pol Reddy; Prasad, B. V. S. S. S.; Tarigonda, Hariprasad; Reddy, D. Raghurami

doi:10.1007/s10973-020-09841-2

Cited by 3 publications

(1 citation statement)

References 32 publications

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“…The injected air forms as a film over the blade surface and protects the blade from the hot mainstream gas. Many researchers have investigated the performance of the air film cooling and its dependence on the geometric and operating parameters (Zhang and Hassan, 2006; Kassab et al , 2003; Nemdili et al , 2011; Klavetter et al , 2016; Wang et al , 2015; Singh et al , 2017; Kelishami and Lakzian, 2017; Krishna and Parammasivam, 2021; Kukutla et al , 2021; Taheri et al , 2020).…”

Section: Introductionmentioning

confidence: 99%

A numerical study of mist-air film cooling on a 3-D flat plate

M.V.V.

Surya²,

Singh³

et al. 2022

HFF

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Purpose The purpose of this study is to explore the mist-air film cooling performance on a three-dimensional (3-D) flat plate. In mist-air film cooling technique, a small amount of water droplets is injected along with the coolant air. The objective is to study the influence of shape of the coolant hole and operating conditions on the cooling effectiveness. Design/methodology/approach In this study, 3-D numerical simulations are performed. To simulate the mist-air film cooling over a flat plate, air is considered as a continuous phase and mist is considered as a discrete phase. Turbulence in the flow is accounted using Reynolds averaged Navier–Stokes equation and is modeled using k–e model with enhanced wall treatment. Findings The results of this study show that, for cylindrical coolant hole, coolant with 5% mist concentration is not effective for mainstream temperatures above 600 K, whereas for fan-shaped hole, even 2% mist concentration has shown significant impact on cooling effectiveness for temperatures up to 1,000 K. For given mist-air coolant flow conditions, different trend in effectiveness is observed for cylindrical and fan-shaped coolant hole with respect to main stream temperature. Research limitations/implications This study is limited to a flat plate geometry with single coolant hole. Practical implications The motivation of this study comes from the requirement of high efficiency cooling techniques for cooling of gas turbine blades. This study aims to study the performance of mist-air film cooling at different geometric and operating conditions. Originality/value The originality of this study lies in studying the effect of parameters such as mist concentration, droplet size and blowing ratio on cooling performance, particularly at high mainstream temperatures. In addition, a systematic performance comparison is presented between the cylindrical and fan-shaped cooling hole geometries.

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