Large Blast-Wave Simulators (LBS) with Cold-Gas Drivers: Computational Design Studies

摘要

Computational, parametric design studies were carried out using the BRL-QID hydrocode to investigate the effects of variations in length of a US-LBS designed to simulate blast waves within a predefined test envelope. The simulation requirement was based on a 60m/kT 1/3 Height of Burst, scaled, tactical explosion for shock overpressures ranging from 14 to 240 kPa (2-35 psi) and weapon yields rangining form 1 kT to 1 MT. The US-LBS design is based on the LBS at the Centre d'Etudes de Gramat (CEG), France. However, the cross sectional reference area of the test section is expected to be twice the size of the French facility. Studies are preformed to investigate the effects of changes of the driver length, the expansion tube length without RWE and the expansion tube length with a passive RWE. The results of these studies are presented in form of design envelopes, and discussed. Recommendations are made for the US-LBS design. Keywords: Large Blast wave simulators; Shock tubes; Blast wave simulation; Blast waves; Shock overpressure; Pressure history; Dynamic pressure; Computational fluid dynamics; Hydrocode computations.