Due to higher Mach number on high speed LPT, secondary effects have different impact and structure compared to a conventional turbine. The detailed informations obtained from representative models in high speed test facilities, advanced instrumentation and CFD simulation is definitely contributing to improve the performance of next generation high speed LP turbines by providing high-resolution (time and space) experimental data at engine-scaled conditions (Mach and Reynolds numbers, wake/boundary layer interaction, leakages, cavities…. ). Several key technologies to reduce secondary flows, thus improving turbine performance are expected to be investigated in this representative environment. Please refer to the full topic descriptions document published in this call.