Abstract
A narrow-band screech has been observed during cold flow model test performed by the NASA Marshall Space Flight Center to study trends in Space Shuttle launch acoustic environments. An investigation to determine the source of the screech has been completed by Wyle Laboratories. An acoustic feedback mechanism resulting from interaction between the jet exhaust flow and model launch pads with several exhaust hole configurations has been identified to be responsible for generation of screech. A simple equation which permits prediction of the screech frequencies in terms of the basic testing parameters, such as the nozzle exit Mach number and the distance between the nozzle exit and the surface of the model launch pads, is presented and is found in good agreement with the subject test data. [Work supported by NASA-MSFC.]
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
