LPT Inject - Reduction of Tip Leakage Losses of Low Pressure Turbines by Applying Passive Flow Injection

Two university institutes as well as an Austrian supplier of the aeronautics industry join their forces to achieve the objectives of the proposed project LPT-INJECT. Passive blade tipinjection, recently developed by the Institute of Energy Systems and Thermodynamics, is a novel innovative method to reduce tip-leakage losses in uncooled axial turbine blade rows. The proposed project should answer the question, if passive blade tip-injection can be applied successfully to high speed low-pressure turbines for geared turbofans. Preliminary investigations have already been performed in the project MICROSHROUD. It is the main objective to achieve a weight reduction of the low-pressure turbine blade shrouds without any efficiency penalty due to increased tip-leakage losses.