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The barriers against the flow or jags can be used, increasing of heat transfer rate. Turbojet blade cooling, heat convertors and solar air heater are the devices that jags used in them. Arrangement and geometry of jags are effective on heat and pressure transfer.In present study the heat transfer at turbojet turbine blades entrance has been studied empirically. The thin and square jags were compared distinctly.The air was imported to the conduit in 10000 to 30000 Reynolds. Three step towards the jags height equal to 10, 20, 40, and 3jags height towards the hydraulic diameter of conduit equal to 0.068. 0.137 And 0.205 were considered and jags were implemented in 90° attack angle. In experimented domain, it was revealed that heat would be increased with reduction of step to jags height ratio and increasing of jags height to hydraulic diameter of conduit ratio.

Empirical study of heat transfer at input area of turbojet blades