Effects of Shock Control Bumps on Transonic Buffet of a Supercritical Aerofoil

Effects of Shock Control Bumps on Transonic Buffet of a Supercritical Aerofoil

Bremm, M.J.

Schröder, W. (mentor)
Klaas, M. (mentor)

Aerospace Engineering

Aerodynamics, Wind Energy & Propulsion

2017-07-17

The mechanism of three-dimensional shock control bumps (SCBs) to reduce wave drag is widely understood. Further, it has been claimed potential for passive flow control of transonic buffet. Although the underlying mechanisms of how SCBs favourably influence buffet onset are thought to be understood in broad terms, no experiments of SCBs in an unsteady flow field exist that verify this (Bruce and Colliss (2015)). Two different SCB geometries which have already been investigated in a steady flow field, experimentally and numerically, were investigated in buffet conditions. Image post processing was used to detect the oscillating shock wave position from schlieren images and velocity vector fields. It thus became possible to divide the velocity field into the time-average, the cyclic component and the turbulent component, known as triple decomposition. The time-averaged and the phase-averaged flow field were analysed in respect to the shock position and boundary layer separation.

http://resolver.tudelft.nl/uuid:dbdf1588-e46e-4450-bdb5-6ded91cf50d8

Student theses

master thesis

(c) 2017 Bremm, M.J.