Evaluation of shock dividers using numerical and experimental methods

Mohammad Rezay Haghdoost, Bhavraj S. Thethy, Maikel Nadolski, Rupert Klein, Damon Honnery, Daniel Edgington-Mitchell, Bonggyun Seo, Christian Oliver Paschereit, Kilian Oberleithner

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther

Abstract

Mitigation of pressure pulsations in the exhaust of a pulse detonation combustor is crucial for operation with a downstream turbine. For this purpose, a device termed the shock divider is designed and investigated. The intention of the divider is to split the leading shock wave into two weaker waves that propagate along separated ducts with different cross-sections, allowing the shock waves to travel with different velocities along different paths. The separated shock waves redistribute the energy of the incident shock wave. The shock dynamics inside the divider are investigated using numerical simulations. A second order dimensional split finite volume MUSCL-scheme is used to solve the compressible Euler equations. Furthermore, low-cost simulations are performed using Geometrical Shock Dynamics to predict the shock wave propagation inside the divider. The numerical simulations are compared to high-speed schlieren images and time-resolved total pressure recording. For the latter, a high frequency pressure probe is placed at the divider outlet, which is shown to resolve the transient total pressure during the shock passage. Moreover, the separation of the shock waves is investigated and found to grow as the divider duct width ratio increases. The numerical and experimental results allow for a better understanding of the dynamic evolution of the flow inside the divider and inform its capability to reduce the pressure pulsations at the exhaust of the pulse detonation combustor.

Original languageEnglish
Title of host publicationAIAA Scitech 2020 Forum
PublisherAmerican Institute of Aeronautics and Astronautics
Number of pages19
ISBN (Print)9781624105951
DOIs
Publication statusPublished - 2020
EventAIAA Scitech Forum 2020 - Orlando, United States of America
Duration: 6 Jan 202010 Jan 2020

Publication series

NameAIAA Scitech 2020 Forum
Volume1 PartF

Conference

ConferenceAIAA Scitech Forum 2020
CountryUnited States of America
CityOrlando
Period6/01/2010/01/20

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