Low-dimensional characteristics of a transonic jet. Part 2. Estimate and far-field prediction
作者： C. E. TINNEY , L. S. UKEILEY , M. N. GLAUSER
DOI: 10.1017/S0022112008003601
关键词: Field (physics) 、 Vector field 、 Sound pressure 、 Mach number 、 Jet (fluid) 、 Turbulence 、 Physics 、 Classical mechanics 、 Mechanics 、 Retarded time 、 Transonic
摘要: Complementary low-dimensional techniques are modified to estimate the most energetic turbulent features of a Mach 0.85 axisymmetric jet in flow's near-field regions via spectral linear stochastic estimation. This model is three-dimensional, comprises all three components velocity field and time resolved. The technique employs pressure as unconditional input, measured within hydrodynamic periphery flow where signatures (pressure) known comprise reasonable footprint large-scale structure. Spectral estimation coefficients derived from joint second-order statistics between that representative low-order (Fourier-azimuthal decomposition) (proper orthogonal decomposition). A bursting-like event observed similar what was found low-speed studies others. number estimates created using different velocity-pressure mode combinations which predictions far-field acoustics invoked Lighthill's analogy. overall sound level (OASPL) directivity determined prediction, qualitatively trends when compared direct measurements at r/D=75. Retarded topologies predicted 90° 30° also shown manifest, respectively, high- low-frequency wave-like motions combination only modes (m = 0, 1, 2). work thus constitutes first step developing dynamical system models for estimating predicting behaviour energy-containing events govern many physical constituents flows.
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