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首页> 美国政府科技报告 >Simulation of a Blast Wave in a Shock Tube by Using Perforated Plates in the Driver
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Simulation of a Blast Wave in a Shock Tube by Using Perforated Plates in the Driver

机译：用驱动器中的穿孔板模拟激波管中的爆炸波

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The simulation of a blast wave in a conventional air-driven shock tube by means of judiciously positioning perforated plates in the driver with porosities judiciously selected is investigated both numerically and experimentally. For the numerical study the random-choice method is used in a much improved and extended form. Most notable in terms of the anaysis, which is presented and explained in detail, is the incorporation of perforated plates with area changes and head losses, head losses from poor diaphragm breakage, friction and heat transfer at the walls, mass loss by jets out of perforations in the walls, sudden changes in grid node spacing, and duct ends that are open to the atmosphere and may or may not include a reflection eliminator. The analysis is also developed to make the computer code efficient, and a factor of at least two is gained in computational time over earlier UTIAS programs. The validity of the analysis and computer code is demonstrated by presenting a number of comparisons of numerical and experimental data. Finally, in terms of numerical predictions, they are made for three different blast-wave simulators. The first has a constant area driver and channel 2.44 m in diameter and an 83-m-long driver with six perforated plates. The last two have a channel 1.22 m in diameter and a constant-area driver 15.2 m long and 2.13 m in diameter, but one driver has six perforated plates and the other only three. For all three simulators the extensive sets of numerical predictions include blast-wave peak overpressures of 1/6, 1/3, 2/3, 1, 3/2, 2, 5/2, and 3 atm, and predictions are also given for the important companion cases of driver-air heating which eliminates density and temperature discontinuities across the contact surface.

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