Investigation Of The Cooling Characteristics Of Lamilloy

Lamilloy is a new cooling technology which has advantage of combining film cooling, internal impingement, large internal heat transfer area and enhanced heat exchange by pin fin array and has characteristic of small quantity coolant consumption and high cooling effectiveness.It has been used on board.The resistance and cooling characteristic of lamilloy were investigated with experimental and numerical simulation in this paper.In this paper,six single layer laminate plates and blades were made.The resistance and cooling characteristic were investigated in a large scale low speed close-looped wind tunnel and heat wind tunnel respectively.The experimental results of resistance investigation indicated that the resistances of laminate plate and blade were mainly determined by the ratio of the hole area to the plate, and the bigger the ratio, the smaller the resistance. The other geometries such as height of the channel were secondary importance.The experimental results of cooling effectiveness investigation indicated that very high effectiveness can be achieved by using lamilloy and the ratio of the hole area to the plate will play the most important role of cooling effectiveness. The cooling effectiveness of pressure side of blade was higher than suction side.Numerical simulation were conducted to calculate four laminate plates with three types of flow patterns under experimental conditions.The resistance and cool -ing effectiveness were obtained.The simulation results were in good agreement with the experimental data but large discrepancies exited in some cases.Conjugate three dimension coupled fluid/solid numerical simulation was carried out for sixteen Lamilloy configurations with different geometry parameters. Numerical results showed that in the condition of same coolant mass flux cooling effectiveness can be increased by reducing passage height and hole diameter of Lamilloy, but the resistance of it became larger simultaneity. Large size of the internal heat transfer surfaces and high value of heat transfer coefficient created by the coolant impingement lead to a large portion of the heat to be removed. The obtained results would be valuable for the optimization in designing Lamilloy.