Conical convergent-divergent (CCD) nozzles represent an important category of supersonic
jet-engine nozzles which require variable throat areas and variable exit areas to adapt to a …

The development of three-stream variable-cycle turbofan engines for tactical aircraft
provides an opportunity for noise reduction by sha** the exhaust of the secondary and …

Professor Philip Doak spent a very productive time as a consultant to the Lockheed-Georgia
Company in the early 1970s. The focus of the overall research project was the prediction …

A model is proposed for predicting the presence of cumulative nonlinear distortions in the
acoustic waveforms produced by high-speed jet flows. The model relies on the conventional …

The goal of the present investigation is to study the effect of using fluid inserts for noise
control at high exhaust temperatures by performing a sequence of large eddy simulations on …

This paper presents a comprehensive overview of the operation and spectral performance of
a novel lab-scale afterburning jet noise rig at Virginia Tech. The study involved steady-state …

A Mach 2.0 round jet at design and off-design condition is experimentally manipulated using
two steady radial injectors to investigate the effect of fluidic injection on jet mixing. A new …

With the emergence of more powerful fighter aircraft, supersonic jet noise reduction devices
are being intensively researched. Small-scale measurements are a crucial step in …

This paper describes an experimental study of the effects of jet heating on broadband shock-
associated noise. The noise measurements are supplemented with schlieren flow …

An innovative noise reduction method for supersonic exhaust jets was studied in a model-
scale aircraft carrier environment. Acoustic measurements of model exhaust jets with (and …