Numerical Investigation of Curvature Effect on Detonation Characteristics in Shuttling Transverse Combustion

ABSTRACT

Geometry curvature causes local compression and expansion, which may alter the characteristics of propagating detonation combustion waves. In annular or disk-shaped pressure gain combustors, reactant injectors may be positioned around the curved walls in a cross-flow configuration for better mixing. However, the effects of injection plane curvature on a transverse propagating detonation wave are not well understood. In this seminar, results from 2D numerical simulations of a reacting flow Shuttling Transverse Combustor with different curved injector planes will be presented. The effects of injection plane curvature are isolated to elucidate its impact on a continuously propagating transverse detonation wave.

Peng Hwee is an EngD student from National University of Singapore. He received a B.Eng. in Aerospace Engineering from Nanyang Technological University in 2019. His thesis focuses on performance quantification and improvement in pressure gain combustors.

Post-Processing Methodology for TDLAS Temperature Measurement of Combustion Flows

ABSTRACT

Understanding the temperature flow field in a continuous pressure gain combustor will facilitate advancements in the thermal management of these combustors. Tunable Diode Laser Absorption Spectroscopy (TDLAS) is an optical technique for non-intrusive, in-situ measurement of high-temperatures in highly unsteady flow in such combustors. In recent years, significant progress has been made to these measurements, with MHz measurement in detonation chambers (Nair et al, 2021). This seminar aims to elucidate the post-processing methodologies adopted for robust measurement using TDLAS in our own applications. Flat flame burner experiments have been conducted for validation and preliminary results for TDLAS measurement of a disk-shaped detonation combustor exhaust will also be discussed.

Avion is an EngD student from National University of Singapore. He received a B.Eng. in Aerospace Engineering and B.A. in Economics from Nanyang Technological University in 2020. His thesis focuses on thermal management strategies for continuous pressure gain combustors.