Effect of Fluid-Solid-Thermal Coupling on the Performance of S-Duct in Hypersonic Inlet

Abstract

This article studies the effects of multi-field coupling on the S-duct by a self-developed fluid-solid-thermal bi-directional coupling code. The flow field inside the S-duct is complex with various vortices as the airflow turns. The results indicate that the total pressure recovery coefficient and the total pressure distortion index (DI) change rapidly at the beginning and reach a steady state at about 100s. The σ decreases by 12%, and the DI increases by 2% compared to the starting point. Structural deformation, size of separation zone, and wall temperature changes over time, and stabilizes around 100 s. The deformation mainly occurs at the outlet, with a maximum displacement of 3.65 mm for up-warping and 4.60 mm for expansion. The values of the total pressure recovery coefficient with S-ducts of bias distance with 20, 40, and 60 mm drop by 2.5%, 8.6%, and 12.1%, and the values of the total pressure distortion index increases with S-ducts of bias distance with 20, 40, and 60 mm increase by 10.8%, 15.1%, and 1.7%. The S-duct with a larger aspect ratio has larger separation zones and a smaller total pressure recovery coefficient.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Notes on contributors

Yuan Lin

Yuan Lin is a doctoral student in the Hypersonic Technology Laboratory at National University of Defense Technology, under the supervision of Prof. Chibing Shen. She is currently engaged in the research of hypersonic fluid-solid-thermal coupling.

Yu Yuan

Yu Yuan is a doctoral student in the Hypersonic Technology Laboratory at National University of Defense Technology, under the supervision of Prof. Mingbo Sun. He is currently engaged in the research of hypersonic fluid-solid-thermal coupling.

Chenglong Wang

Chenglong Wang is an associate researcher in the Hypersonic Technology Laboratory at National University of Defense Technology. He received his PhD degree from Lund University in Sweden. His main research interests include heat transfer and hypersonic fluid-solid-thermal coupling.

Chibing Shen

Chibing Shen is a researcher in the Hypersonic Technology Laboratory at National University of Defense Technology. He received his PhD degree from the National University of Defense Technology. He mainly engages in research on rocket and its combined propulsion technology, propulsion system combustion theory and diagnostic technology. He has published over 100 papers.

Mingbo Sun

Mingbo Sun is a professor in the Hypersonic Technology Laboratory at National University of Defense Technology. He has won first prize for National Science and Technology Progress, first prize for Military Science and Technology Progress, and first prize for Natural Science in Hunan Province. He published over 100 SCI papers and 5 Chinese and English monographs. He has received 100 National Excellent Doctoral Dissertations in 2011, Outstanding Youth Fund of the National Natural Science Foundation of China in 2015, and visited Lund University in Sweden and the University of Southampton in the UK. His main research interests include large eddy simulation/direct numerical simulation of supersonic flow and turbulent mixing/combustion laser diagnosis.

Yuan Wang

Yuan Wang is an associate researcher in Hypersonic Technology Laboratory at National University of Defense Technology. She has a PhD in Nanoengineering from the University of Edinburgh, UK. Her research interests include hypersonic propulsion, energy management and utilization, and microscale phase change heat transfer.