Performance Enhancement of Low Pressure Turbine Cascade by Introducing Tubercles


Authors : Pradeep Kumar Behera; P Vasantha Kumar

Volume/Issue : Volume 5 - 2020, Issue 6 - June

Google Scholar : http://bitly.ws/9nMw

Scribd : https://bit.ly/3iyBR0Q

This paper studies the performance characteristics of a Low Pressure Turbine Cascade with and without introducing tubercles. The focus of the project is on improvement in the performance of the turbine cascade. Improving the turbine performance in turn improves the efficiency of the engine. In the present work, tubercles are introduced onto the leading edge of a low pressure turbine cascade so as to enhance its performance in terms of its lift and surface pressure distribution CFD analysis has been carried out on the blades of a low pressure turbine cascade with and without tubercles at zero incidence. Both the results are compared and conclusions are drawn as to which blade has better performance. Blade profile used in both the simulations is T106 turbine blade at a Reynolds number of 1.6x105 . From the simulations method not fully turbulence model with transition model has been used & observed that the pressure difference between the suction and pressure surfaces increases for the blade with tubercles. For the T106 blade without tubercles, separation starts at nearly 76% of chord whereas for the blade with tubercles separation starts at nearly 82% of chord. The present computational investigation shows that flow separation on the LPT cascade is delayed by the use of leading edge tubercles for an extent of 6% of the chord.

Keywords : Low Pressure Turbine Cascade, Tubercles, Low Reynolds number, Transition model.

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