Rapid Chemiluminescent Imaging Behind Reflected Shock Waves
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Current shock tube combustion experiments generally assume that the test environment behind a reflected shock wave is quiescent and that ignition processes progress uniformly over the entire test volume. However, various past investigations, including those based on schlieren data and sidewall imaging [1, 2], have observed nonuniform ignition in certain test regimes. Here, we use both conventional diagnostics (pressure, emission, and laser absorption) and a high-speed chemiluminescent imaging system to investigate the ignition behavior of n-heptane/oxygen/argon in shock tubes at long test times (greater than 2 ms), in an attempt to map the boundary of uniform and nonuniform ignition behavior in one of our shock tubes.
This material is based upon work supported by, or in part by, the US Army Research Laboratory and the US Army Research Office under contract/grant number W911NF1310206.
- 1.Heufer, K.A., Olivier, H., Medvedev, S.P., Khomik, S.V.: Optical investigation of shock induced ignition of different biofuels. In: 23rd International Colloquium on the Dynamics of Explosions and Reactive Systems (ICDERS) at Irvine, California, USA, 2011Google Scholar