Beyond Knowing That: Axiomatizing Ability-Based Logics with Regularity Constraints

Title

Thermoacoustic instability in combustors – taming the “ghost” of gas turbines and rocket engines

Speaker

Prof. Dong Yang (Southern University of Science and Technology)

Time and Location

Friday, November 1, 2024, 12:45-14:00 (Beijing time), 6:45-8:00 am (Israel time), E210 (GTIIT North Campus, Education Building)

Zoom  Meeting

• Link: https://gtiit.zoom.us/j/97226842281?pwd=8qtVu7KBsrfPx87G36Z6ZhHCs7anpQ.1
• Code: 147495

Abstract

Thermoacoustic instabilities (or “combustion instabilities”) come from the positive feedback between acoustics and unsteady combustion; unsteady combustion generates acoustic waves which propagate within the combustor, being reflected by the boundaries, and further disturb the flame to generate more acoustics. This coupling can generate large pressure and heat release oscillations which could reduce the lifetime of the combustion system or even lead to catastrophic damages. In a real combustor, both the geometric shape of the combustor and the burner type are important in affecting its thermoacoustic stability. New thermoacoustic problems are likely to arise in the future gas turbine combustors burning carbon-free fuels such as hydrogen, so good predicting and controlling tools could be very helpful in the design stage of these combustors. Predicting it is very difficult since it requires resolving couplings across very different scales (acoustics, turbulence, and combustion). Full-scale experiments are extremely expensive, but lab-scale rig does not capture all key physics. This talk presents the state-of-the-art treatments in predicting and damping of this instability. More specifically, the state-of-the-art low-order network modelling methodology, and relevant vortex-sound-entropy coupling theories will be presented.

Biography

Dr. Dong Yang is an Associate Professor at SUSTech. He is a recipient of the National Science Fund for Excellent Young Scholars (Oversea) in China. His research focuses on predicting and damping of thermoacoustic instabilities, with expertise in low-order network modelling and vortex-sound-entropy coupling theory. He got his first and Master’s degrees from Tsinghua University in Beijing, and his PhD from Imperial College London. His work won the Osborne Reynolds student Award 2017 — top six PhDs in Fluid Mechanics in the UK, and has been highlighted by the Journal of Sound and Vibration as “2017 Highlight of Aeroacoustics research in Europe”. He has been invited by many leading companies such as Rolls-Royce, Siemens, Reaction Engines, Dongfang Electric, Shanghai Electric, and AECC CAE to give talks or build collaborations on thermoacoustic instabilities. He is an organizer and co-chair of the GPPS Hong Kong23 conference, SoTiC 2023-Symposium on Thermoacoustics in Combustion: Industry meets Academia​, the 23rd International Congress on Acoustics, the Combustion Webinar, the 11th National Fluid Mechanics conference of China and the 51st Inter-Noise conference. His research has been extensively published in Annual Review of Fluid Mechanics, Journal of Sound and Vibration, Journal of Fluid Mechanics, AIAA Journal, Combustion and Flame, Proceedings of the Combustion Institute, Journal of Engineering for Gas Turbines and Power etc.