Abstract
Alongside the development of methods of intensifying convective heat transfer inside the blade, development of methods of local improvement of the efficiency of film cooling of the blades surface is still of immediate interest. The film is formed on the blade surface in conditions of high-camber shape and low initial velocity of the gas flow in the vicinity of the leading edge with its subsequent abrupt acceleration. The paper presents some data on the peculiarities of film formation on the back and pressure side of the blade in the vicinity of the leading edge. Experimental temperature distribution over the adiabatic wall was obtained with the use of a FLIR-E 64501 thermal imager. It was found that the conditions for the film formation on the blade back are more favorable than those on the pressure side. It manifests itself in the fact that optimal blowing parameters on the blade back are considerably lower than those on the pressure side. The use of V-shaped dimples located on the wall immediately behind the holes for blowing was suggested as a measure for local improvement of film cooling efficiency. The efficiencies of film cooling in the formation of a curtain, without the use and with the use of V-shaped dimples behind the holes for blowing were compared. Local improvement of efficiency and uniformity of film cooling distribution with the use of V-shaped dimples behind the holes for blowing was observed.
Highlights
Цитирование: Лебедев В.В., Лебедев О.В., Ремизов А.Е
7 представлены значения осреднённых эффективностей завесного охлаждения 0 при отсутствии V-образных выемок для параметров вдува т 1,9
При этом возрастали значения осреднённых по шагу отверстий эффективностей завесного охлаждения и расширялся диапазон формирования завесной пелены на корытце в сторону снижения m до 1,34
Summary
Особенности формирования завесного охлаждения на спинке и корытце турбинной лопатки при использовании V-образных выемок // Вестник Самарского университета. 1 приведены данные о перфорации для вдува на передней кромке лопатки, корытце и спинке лопатки и параметры V-образных выемок. Спинке и корытце лопатки по её высоте расположены ряды из пяти отверстий с V-образными выемками непосредственно за отверстиями и ряды из пяти отверстий без V-образных выемок.
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