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- W3190954458 abstract "The effect of small-sized conical reflectors on the screech emission of supersonic underexpanded jets was studied experimentally. The investigation focused on two closely spaced fully-expanded Mach numbers, 1.32 and 1.34, and included reflectors with four cone half angles, from 90 degrees to 60 degrees. The acoustic far-field was surveyed by a microphone phased array that included a continuously-scanning microphone, the latter enabling high spatial resolution. The isolated jets contained well-known screech mode B (flapping) and its harmonics. Addition of the reflectors caused significant changes in the modal emission pattern, with mode switching B to C (helical) occurring at fully-expanded Mach number 1.34 but not at 1.32. New modes E and F emerge at both Mach numbers when the cone half-angle is 70 degrees or 60 degrees. The tones are generally unsteady, undergoing fluctuations of as much as 5 dB with time. However, some strong tones that result from the reflection are nearly steady-state. The noise source distribution generally elongates with decreasing cone angle of the reflectors. Some modes show clear scattering from the reflectors, while others do not. The study underscores the complexity that initial conditions can impart on the modal structure of screech." @default.
- W3190954458 created "2021-08-16" @default.
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- W3190954458 date "2021-07-28" @default.
- W3190954458 modified "2023-09-27" @default.
- W3190954458 title "Effect of Nozzle Geometry on the Space-Time Emission of Screech Tones" @default.
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- W3190954458 doi "https://doi.org/10.2514/6.2021-2306" @default.
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