Numerical Simulation And Experimental Study On The Flow And Cooling Characteristics Of The Effusion Cooling Board And Lamilloy Structure

The resistance and heat transfer characteristics of effusion-cooling board or lamilloy structure are investigated with numerical simulation and experimental study in this paper.Numerical simulation was carried out for the resistance and cooling characteristics in simplified flat effusion-cooling board structure. The influences caused by the layout form in 4 types, opening ratio in 4 types, compound angle in 3 types of effusion cooling structures are studied in this paper. The results show that, a pair of vortexs appear at the downstream of the exit of the film holes, the mainstream crosses over the jet flow and gets convergence downstream it; with the increases of P/S, the flow resistance coefficient increases at first and then decreases, the discharge coefficient increases and the cooling effect decreases all along; with the increases of the opening ratio, the discharge coefficient decreases and the cooling effect increases all along. The layout form of rhombold benefits the coverage of the film and the increase of the cooling effect. Appropriate compound angle could reduce the resistance coefficient when this angle was not too large.Numerical simulation was carried out for the resistance and cooling characteristics on which in simplified flat lamilloy structure. The influences caused by the layout form of pin-fins in 3 types, opening ratio of the intake board in 4 types, diameter of film holes in 4 types, height of pin-fins in 4 types, diameter of pin-fins in 3 types are studied in this paper as for the lamilloy cooling structure. The results show that, the layout form of the pin-fins influences the flowing characteristics very much, the existence of pin-fins right between the impingement holes and the film holes eliminate the cooling air flows straightforward into the film hole, and the existence of pin-fins right between the impingement holes decreases the impact of the after-impingement flow with each other. With the increase of the opening ration of the impingement holes, the flow resistance coefficient increases, the discharge coefficient decreases and the total cooling effect increases. With the increase of the diameter of film holes, the flow resistance coefficient decreases, the discharge coefficient increases and the total cooling effect increase slowly. With the increase of the diameter of the pin-fins, the flow resistance coefficient decreases and the total cooling effect increases slowly. It shows a remarkable influence to the flow and cooling characteristics caused by the layout form of the pin-fins.