Open AccessAnalysis of Flow Characteristics and Overall Cooling Effectiveness of Ultra-high Impingement Distance Heat Shield
Author(s) -
Xie Long,
Cunliang Liu,
Jianjun Zhou
Publication year - 2019
Publication title -
proceedings
Language(s) - English
Resource type - Conference proceedings
ISSN - 2504-4400
DOI - 10.33737/gpps19-bj-109
Subject(s) - heat shield , turbulence , mechanics , coolant , materials science , heat transfer , reynolds averaged navier–stokes equations , shield , reynolds number , shields , thermodynamics , physics , composite material , geology , electromagnetic shielding , petrology
Computational investigations is reported on a flat plate subjected to combined impingement and film cooling. Conjugate heat transfer and 3-D steady RANS approach with the k-ω SST turbulence model were used for analysis of the impingement and film cooling plates. The flow dynamic features of impinging jets and the coolant-mainstream interaction in presence of heat shield are described. The discharge coefficients are presented at blowing ratio M = 0.2 to 0.8 and Reynolds number Re 9300 to 75000 respectively. A comparison between the conventional heat shield and ultra-high impingement distance heat shield shows that the discharge coefficients values for the new heat shield are higher. The value of overall cooling effectiveness for the new heat shield is lower than the conventional structure at low blowing ratio, but at high blowing ratio, the values of overall cooling effectiveness for both the heat shields are almost equal. As the blowing ratio is increased from 0.2 to 0.8, the overall effectiveness values show an increasing trend for both the heat shields.