Heat Transfer in a Square Ribbed Channel: Evaluation of Turbulent Heat Transfer Models

Abstract

This paper presents the results of integral heat transfer measurements taken in a square ribbed cooling channel configuration for evaluating heat transfer and turbulent flow characteristics in convective cooled gas turbine blades and draws a comparison with numerical results. The heated section of the channel is either smooth or equipped with 45 ∘ crossed ribs on two opposite walls. The first part of the paper describes the instrumentation and experimental setup in detail. The second part compares the numerical calculations with the experimentally determined results. The turbulent heat transfer is calculated using two common algebraic models and three implemented explicit algebraic models, each time in combination with an explicit algebraic Reynolds stress model. The numerical calculations show that the use of higher-order models for the turbulent heat flux provides a higher accuracy of the heat transfer prediction for both configurations. The best model is able to predict almost all results within the experimental uncertainties.

Heat transfer and flow structures of supercritical n-decane in a regenerative cooling channel loaded with non-uniform heat flux

“…The results indicated that wall temperature remained decreased when the aspect ratio of the channel was increased from 1 to 8 in regenerative cooling channels, but the reduction rate decreased slowly. With Some experiments are performed to study the principles of flow and heat transfer characteristics (Li Z, et al, 2019;Wörz et al, 2019;Peszynski and Tesař 2020;Yan et al, 2020). carried out experiments under different engine-like working conditions to investigate the dynamic characteristics of the hydrocarbon fuel at high temperatures.…”

“…The settling time increased with the increased heat flux for both outlet fuel temperature and wall temperature. Wörz et al (2019) first experimentally studied the heat transfer and flow characteristics for gas turbine blades and then compared them with numerical results by adopting two common algebraic models and three implemented explicit algebraic models. The results indicated that the higher-order heat flux model would bring a remarkable improvement in heat transfer.…”