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Flow, Turbulence and Combustion

, Volume 102, Issue 2, pp 255–277 | Cite as

Experimental Study of Reactant Mixing in Model Rotating Detonation Combustor Geometries

  • Richard BluemnerEmail author
  • Myles D. Bohon
  • C. Oliver Paschereit
  • Ephraim J. Gutmark
Article

Abstract

Reactant mixing has been identified as one of the driving factors for successful and stable operation of Rotating Detonation Combustors (RDC). This work investigates the stationary mixing in a scaled model RDC cross section in a water tunnel. Two configurations with one and five dyed water jets injecting into a confined water crossflow modeled the mixing scheme used in the radially inward injecting RDC at TU Berlin. The influence of several parameters on the mechanisms driving the mixing quality was investigated, with the objective of improving future injection strategies. The parameters studied were: the position of the fuel injectors relative to the RDC outer wall, the shape of the corner between the oxidizer injection slot and the detonation annulus, and the ratio of fuel to oxidizer momentum flux. High-speed PLIF imaging of the longitudinal plane centered at the middle jet injection hole, as well as of several planes perpendicular to the longitudinal plane, confirmed the existence of a strong shear layer and recirculation zone at the RDC outer wall corner that significantly influenced the mixing. Depending on the jet location and the jet-to-crossflow velocity ratio, different mechanisms impacted the reactant mixing.

Keywords

Rotating detonation Jet in crossflow Mixing Pressure gain combustion 

Nomenclature

A

jet trajectory model factor

c

jet trajectory model exponent

D

fuel jet diameter in model, m

d

fuel jet diameter in engine, m

G

crossflow confinement gap width in model, m

g

crossflow confinement gap width in engine, m

m

jet trajectory model exponent

R

blowing ratio (velocity ratio)

u

velocity, m/s

W

combustor annulus width in model, m

x

radial position, m

y

axial position, m

ρ

density, kg/m3

injection hole separation distance in engine, m

Subscript

c

values for crossflow properties in model

j

values for jet properties in model

a

air

f

fuel

w

water

Notes

Acknowledgements

Financial support from the Einstein Foundation Berlin is gratefully acknowledged. The authors also appreciate the help of Andy Göhrs for assistance with the experimental setup.

Compliance with Ethical Standards

This study was funded by the Einstein Foundation Berlin (grant number EVF-2015-229 (TU)).

Conflict of interests

The authors declare that they have no conflict of interest.

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Copyright information

© Springer Nature B.V. 2018

Authors and Affiliations

  1. 1.Chair of Fluid DynamicsTechnische Universität BerlinBerlinGermany
  2. 2.Department of Aerospace EngineeringUniversity of CincinnatiCincinnatiUSA

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