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Detonation Wave Dynamics in a Rotating Detonation Engine

Conference · · AIAA Scitech 2019 Forum
DOI:https://doi.org/10.2514/6.2019-0198· OSTI ID:1995280
 [1];  [2]
  1. University of Michigan, Ann Arbor; University of Michigan, Aerospace Engineering
  2. University of Michigan, Ann Arbor
+ Show Author Affiliations

Rotating detonation engines have complex unsteady flow fields that have been observed to give rise to multiple wave systems beyond the main detonation wave they are intended to produce. In this work we have developed a new analysis technique we refer to Circuit Wave Analysis to identify and describe the system of waves associated with the reaction fronts that exist in the RDE from time-resolved, high-speed end-view chemiluminescence movies of the reaction fronts. For each wave system, we then extract the speed of the wave, its direction and strength (from a measure of spectral power). Through this approach we have determined that under a range of operating conditions RDE flow fields are characterized by three separate wave systems: the main detonation wave and two secondary wave systems, which, based on their relationship relative to the main detonation wave, we refer to as the counter rotating fast wave and counter rotating slow wave pair, respectively. The properties of all three waves vary with both operation condition (air mass flow rate and equivalence ratio) and the configuration of the air inlet and fuel injector. The controlling mechanisms behind the secondary wave systems are not currently known. However, the impact that secondary waves have on some of the detonation properties can be observed in select cases. For example, the presence of a secondary wave has been observed to correspond with a reduction in detonation wave speed.

Research Organization:
University of Michigan, Ann Arbor
Sponsoring Organization:
USDOE Office of Fossil Energy and Carbon Management (FECM)
DOE Contract Number:
FE0031228
OSTI ID:
1995280
Report Number(s):
DOE-UMICH-FE0031228-015
Journal Information:
AIAA Scitech 2019 Forum, Journal Name: AIAA Scitech 2019 Forum
Country of Publication:
United States
Language:
English

References (10)

High-speed imaging of wave modes in an RDC journal April 2019
Analysis of an RDE with Convergent Nozzle in Preparation for Turbine Integration
  • Tellefsen, Jonathan; King, Paul; Schauer, Fred
  • 50th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition https://doi.org/10.2514/6.2012-773
conference November 2012
Study of the Effects of Various Injection Geometries on the Operation of a Rotating Detonation Engine conference January 2018
Feedback into Mixture Plenums in Rotating Detonation Engines conference November 2012
Chemiluminescence imaging of an optically accessible non-premixed rotating detonation engine journal February 2017
Dynamics of Counter-Rotating Wave Modes in an RDC conference July 2018
Numerical Optimisation in Non Reacting Conditions of the Injector Geometry for a Continuous Detonation Wave Rocket Engine journal June 2015
Characterization of Detonation Wave Propagation in a Rotating Detonation Rocket Engine using Direct High-Speed Imaging conference July 2018
Continuous Spin Detonations journal November 2006
Experimental research on the rotating detonation in gaseous fuels–oxygen mixtures journal January 2011

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