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Taking the Heat Out of Hot Spots at QinetiQ

From AC&E Inc.
 

 

Apart from the huge centripetal forces on turbine blades, hot spots around blades can peak at temperatures above 2,000 K, creating thermal fatigue that can ultimately lead to cracks that can cause blades to snap off. Made from special metals, turbine blades are generally the most expensive component in an engine. Since a set of blades for a large industrial gas turbine, for example, could cost £1 million, any developments aimed at increasing blade life are keenly monitored and assessed by designers and users alike.

Controlling the temperature across the blade can reduce creep significantly. Until now, manufacturers have had to take a very conservative approach to the design of such components and adopt a precautionary route to checking and replacing blades more frequently than may be necessary. This means taking the gas turbine out of service at a cost in excess of £250,000 per day for a large engine. Hence, accurately predicting the interval between inspections can have a massive effect on operational costs.

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