Mach stem formation in outdoor measurements of acoustic shocks.
نویسندگان
چکیده
Mach stem formation during outdoor acoustic shock propagation is investigated using spherical oxyacetylene balloons exploded above pavement. The location of the transition point from regular to irregular reflection and the path of the triple point are experimentally resolved using microphone arrays and a high-speed camera. The transition point falls between recent analytical work for weak irregular reflections and an empirical relationship derived from large explosions.
منابع مشابه
Free Boundary Problems for Nonlinear Wave Systems: Mach Stems for Interacting Shocks
We study a family of two-dimensional Riemann problems for compressible flow modeled by the nonlinear wave system. The initial constant states are separated by two jump discontinuities, x = ±κay, which develop into two interacting shock waves. We consider shock angles in a range where regular reflection is not possible. The solution is symmetric about the y-axis and on each side of the y-axis co...
متن کاملShocks in unmagnetized plasma with a shear flow: Stability and magnetic field generation
Convective radial energy flux due to resonant magnetic perturbations and magnetic curvature at the tokamak plasma edge Modification of the formation of high-Mach number electrostatic shock-like structures by the ion acoustic instability Phys. Generation of magnetic field and electrostatic shock wave driven by counterstreaming pair plasmas A pair of curved shocks in a collisionless plasma is exa...
متن کاملWaves in interplanetary shocks: a wind/WAVES study.
We describe results from the first statistical study of waveform capture data during 67 interplanetary (IP) shocks with Mach numbers ranging from approximately 1-6. Most of the waveform captures and nearly 100% of the large amplitude waves were in the ramp region. Although solitary waves, Langmuir waves, and ion acoustic waves (IAWs) are all observed in the ramp region of the IP shocks, large a...
متن کاملDust ion-acoustic shocks in quantum dusty pair-ion plasmas
Abstract The formation of dust ion-acoustic shocks (DIASs) in a four-component quantum plasma whose constituents are electrons, both positive and negative ions and immobile charged dust grains, is studied. The effects of both the dissipation due to kinematic viscosity and the dispersion caused by the charge separation as well as the quantum tunneling due to the Bohm potential are taken into acc...
متن کاملCharacterizing acoustic shocks in high-performance jet aircraft flyover noise.
Acoustic shocks have been previously documented in high-amplitude jet noise, including both the near and far fields of military jet aircraft. However, previous investigations into the nature and formation of shocks have historically concentrated on stationary, ground run-up measurements, and previous attempts to connect full-scale ground run-up and flyover measurements have omitted the effect o...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- The Journal of the Acoustical Society of America
دوره 138 6 شماره
صفحات -
تاریخ انتشار 2015