09:40   PIV/PTV methods and applications III Research on Combustion Mode Identification Method for Ramjet Based on Particle Image Velocimetry Guang Chang, Hongjie Zhong, Guannan Men Abstract: To address the testing requirements for the internal flow fields in scramjet engines, a combustion mode identification method based on particle image velocimetry (PIV) technology was developed, employing aluminum oxide powder as tracer particles with a high-frequency pulsed laser and high-speed camera serving as the excitation source and detector respectively, enabling measurements of both transient and time-averaged velocity field distributions in different combustion modes within the scramjet engine. Experimental results demonstrated that the airflow Mach number at the engine inlet could be derived from the inflow total temperature combined with PIV measurements, achieving reliable combustion mode identification whose accuracy was validated by conventional pressure-based recognition methodologies. 360° volumetric LPT measurements around a robotically actuated model of a wing Thomas Rockstroh, Alex Nila Abstract: The aerodynamics of flapping flight are very intricate and the evolving vortex systems are complex in a spatial as well as in a temporal sense [1]. In order to fully capture such flow scenarios in an experimental study, three-dimensional and time-resolved flow measurements are required alongside the measurement of the flapping insect/ wing/ model to further enhance insights into the fluid-structure-interaction. Up until recently, many volumetric measurements were limited to or solely focused on measuring regions in the wake of aerodynamic models due to negative impacts of optical obstructions during the reconstruction step. In order to overcome such limitations, a novel object-aware extension to 3D Lagrangian particle tracking methods – OA-LPT – was proposed by Wieneke and Rockstroh [2]. With OA-LPT it becomes possible to inform the particle reconstruction step about the presence of a view-obstructing object. As a result, only camera perspectives for the reconstruction of a particle are considered, which are physically able to see a particle and therefore minimizing reconstruction artifacts. In the initial paper by Wieneke and Rockstroh, only static objects were considered but in the meantime further developments have been made to support dynamic objects as well. With this contribution, we want to present an experimental set-up and first measurement results to demonstrate the potential of applying this novel method in the research context of flapping flight aerodynamics.

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