Simulation and Measurements of Small Arms Blast Wave Overpressure in the Process of Designing a Silencer
Abstract Simulation and measurements of muzzle blast overpressure and its physical manifestations are studied in this paper. The use of a silencer can have a great influence on the overpressure intensity. A silencer is regarded as an acoustic transducer and a waveguide. Wave equations for an acoustic dotted source of directed effect are used for physical interpretation of overpressure as an acoustic phenomenon. Decomposition approach has proven to be suitable to describe the formation of the output wave of the wave transducer. Electroacoustic analogies are used for simulations. A measurement chain was used to compare the simulation results with the experimental ones.
A study on impulsive sound attenuation for a high-pressure blast flowfield
The present work addresses a numerical study on impulsive sound attenuation for a complex high-pressure blast flowfield; these characteristics are generated by a supersonic propellant gas flow through a shock tube into an ambient environment. A numerical solver for analyzing the high pressure blast flowfield is developed in this study. From numerical simulations, wave dynamic processes (which include a first precursor shock wave, a second main propellant shock wave, and interactions in the muzzle blasts) are simulated and discussed. The pressure variation of the blast flowfield is analyzed to evaluate the effect of a silencer. A live firing test is also performed to evaluate four different silencers. The results of this study will be helpful in understanding blast wave and in designing silencers.
Muzzle Blast from 105mm M735 Round
Abstract : The overpressure field around an M68 tank cannon firing an M735 round was studied. Pressure transducers were located from 15 to 400 calibers from the muzzle and at 30 degree increments around the gun. The investigation yielded a detailed picture of the flow field, as displayed by overpressure traces. Comparisons of the overpressure data with a prediction method show better agreement for the measured points nearer to the muzzle. The peak overpressure, time-of-arrival, and positive-phase-duration data will be used together with other gun blast data to modify and improve the present prediction method. Observed anomalous pulses were also investigated but their origins remain unknown.