The non-steady flow generated by convection of gas containing non-uniform temperature
regions or “entropy spots” through a nozzle is examined analytically as a source of acoustic …

This paper discusses the sound generated when an inhomogeneity in density is convected
in a low Mach number steady flow through a contraction in a duct of infinite extent, and also …

IN recent years, there has been considerable interest in the acoustic power losses that occur
as a result of the interaction between acoustic fields and shear layers in separated flows. Of …

Analytical and numerical assessments of the indirect noise generated through a nozzle are
presented. The configuration corresponds to an experiment achieved at DLR by Bake et …

Small perturbations of a choked flow through a thin annular nozzle are investigated. Two
cases are considered, corresponding to a 'choked outlet'and a 'choked inlet'respectively. For …

The development and transmission of sound through the exit of an aero-engine combustor is
often investigated by modelling the complex geometry as a convergent-divergent nozzle …

This paper examines the energy conversion mechanisms which govern the emission of low
frequency sound from an axisymmetric jet pipe of arbitrary nozzle contraction ratio in the …

The acoustic nonlinearity of an orifice in a plate has been investigated by measuring
simultaneously the oscillatory flow velocity in the orifice and the acoustic‐pressure …

An experimental study has been carried out in a controlled environment in a large anechoic
chamber at Boeing to clarify certain features associated with the nonlinear distortion of …

This paper examines the aeroacoustics associated with model nozzles operating
supersonicall y. In particular the shock structure and radiated shock noise of Mach 1.5 and …