SMALL SUBMERGED SUPERSONIC GAS JETS. RESULTS OF A SERIES OF EXIT-STABILITY AND NOISE TESTS,
Abstract
High-speed photography revealed that several submerged supersonic gas jets were unstable and broke up into a bubbly water mixture very rapidly upon exit. Jet instability varied in amplitude at a frequency of approximately 300 cps. Over- or underexpansion of the jet did not noticeably affect jet instability. Occasionally, during periods of extremely high-amplitude pulsing, the jet would form a large bubble. The bubble would rapidly expand and disintegrate, generating a pressure wave of high intensity. A frequency spectrum analysis revealed noise with a bandwidth of approximately 50 to 4,500 cps, with a number of reinforced peaks. The spectrum shape varied little with chamber pressure, and therefore was not affected by over- or underexpansion of the gas jet. Neither jet instability nor resonating bubbles contributed noticeably to the noise spectrum. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1966
- Accession Number
- AD0627328
Entities
People
- Howard V. L. Patrick
Organizations
- Naval Air Weapons Station China Lake