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NASA NTRS · Conference Paper

Yaw and spin effects on high intensity sound generation and on drag of training projectiles with ring cavities

Published 2019-06-24 From Legacy CDMS 4 authors
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Attribution

This is the abstract and citation. Full text lives at NASA NTRS — we link out rather than host. All credit to the authors and Legacy CDMS.

Abstract

Verbatim from NASA NTRS. Not paraphrased, not summarized.

Projectiles 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.

Authors

  • Parthasarathy, S. P. Jet Propulsion Lab., California Inst. of Tech.
  • Cho, Y. I. Jet Propulsion Lab., California Inst. of Tech.
  • Kwack, E. Y. Jet Propulsion Lab., California Inst. of Tech.
  • Back, L. H. California Institute of Technology

Citation: Parthasarathy, S. P., Cho, Y. I., Kwack, E. Y. , et al. (2019). Yaw and spin effects on high intensity sound generation and on drag of training projectiles with ring cavities. Legacy CDMS. NASA NTRS ID 19860035186. https://ntrs.nasa.gov/citations/19860035186 ↗