Yaw and spin effects on high intensity sound generation and on drag of training projectiles with ring cavitiesProjectiles containing axisymmetric ring cavities constitute aeroacoustic sources. These produce high intensity tones which are used for coding in the SAWE (Simulation of Area Weapons Effects) system. Experimental data obtained in a free jet facility are presented describing the effects of yaw, spin and geometric projectile parameters on sound pressure and drag. In general, the sound pressure decreases with increasing yaw angle whereas the drag increases. Spin tends to increase sound pressure levels because of a reduction in asymmetry of flow. Drag increases at zero yaw approximately as the 1.5 power of sound wavelength. A significant part of the drag increase appears to be due to energy loss by sound radiation.
Document ID
19860035186
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Parthasarathy, S. P. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Cho, Y. I. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Kwack, E. Y. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Back, L. H. (California Institute of Technology Jet Propulsion Laboratory, Pasadena, United States)