Evolution of Autocorrelation in Detonation Interaction with Homogeneous, Isotropic Turbulence
Detonation-turbulence interaction (DTI) differs from shock-turbulence interaction (STI) due to exothermicity, and the presence of a detonation lengthscale, intrinsic fluctuations of the unstable detonation front and a self-excited unstable region which supports intrinsic time scales. Downstream of the wavefront, a global instability exists due to self-excited acoustic coupling. Linear analysis found selective wave amplification that depends on both the turbulence lengthscale and the half-reaction distance . A subsequent DNS found that the preshock perturbations strongly affect the postshock statistics . This paper examines the evolution of the autocorrelation of the longitudinal velocity fluctuations for STI and DTI, some of which have been presented in . Local homogeneity and isotropy are assumed.
KeywordsDetonation Wave Isotropic Turbulence WENO Scheme Global Instability Detonation Wave Front
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- 3.Massa, L., Chauhan, M., Lu, F.K.: Detonation–Turbulence Interaction. Combust Flame (in press, 2011)Google Scholar