Investigation of the HDT-TVF interaction for small core engines (TVFInterakt)

The current development strives for engine architectures with significantly higher pressure and bypass ratios. One possibility is to scale the core engine to smaller dimensions. If the fan diameter remains constant, the bypass ratio can be significantly increased by scaling the core engine and thus the propulsive efficiency can be improved. However, reducing the size of the flow channel leads to a non-linear increase in secondary flow losses (size effect). The project deals with the quantification of the size effect with regard to the performance of the high-pressure turbine (HPT) and the turbine vane frame (TVF).

Primarily, experimental test campaigns with different turbine guide vane geometries are planned. The wind tunnel at the chair will be adapted to carry out high subsonic tests to enable measurements at realistic Mach numbers. This ensures that the test results can be transferred to real engine conditions. The experimental results will then be used to validate numerical calculations. The goal is to gain a better understanding of the size effect, because to date there is no universal source concerning all the variables and their respective influence on the loss mechanisms.