Impulsive discharge noise: Balloon burst problem and engine exhaust pulses

DOI PDF 被引用文献2件

書誌事項

公開日
1978-07-01
DOI
  • 10.1121/1.381975
公開者
Acoustical Society of America (ASA)

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説明

<jats:p>Two cases of impulsive discharge, balloon burst and engine exhaust, are experimentally investigated to find scaling laws for the discharge time τ and the pressure amplitude A of the acoustic pulse. Observations show that the flow may be modeled as a pressure reservoir of dimension D and overpressure Δp suddenly discharging through an aperture growing with time. If W is a characteristic aperture velocity, the aperture area varies as (Wτ)2 for the balloon burst and as Wτ for the engine exhaust. The flow is driven by a complex, unsymmetric wave field within the volume. It is shown that D/τ∝ (CiW2)1/3 and A/Δp∝ (Ci/W)4/3 for the balloon burst, where Ci is the sound speed in the reservoir. The corresponding quantities for the engine exhaust pulses are (CiW)1/2 and Ci/W.</jats:p>

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