The high pressure waves generated due to muzzle blast flow of tank gun during firing is a critical issue to examine. The impulsive noise from the gun has various negative effects such as damage of human bodies, damage of structures, creating an environmental, social problem and also military problems such as exposure of location of troops. This high pressure impulsive sound, generated during the blast flow, was studied and attenuated. An axisymmetric computational domain was constructed by employing Spalart Allmaras turbulence model. Approximately 90% of pressure and 20 dB of sound level are reduced due to the use of the three baffle silencer at the muzzle end of the gun barrel, in comparison with the tank gun without silencer. Also, the sound pressure level at different points in the ambient region shows the same attenuation in results. This study will be helpful to understand the blast wave characteristics and also to get a good idea to design silencer for large caliber weapon system.

Hydrogen compressing system is the most important part of hydrogen economy. There develop inherently pressure pulsation in reciprocating hydrogen compressing system. Snubber unit has been employed then to decrease it. An experiment has been conducted to investigate the performance of snubber used in reciprocating compression system. CFD analysis is applied to get the pressure values at different sections of this system. Regression models are also developed for amplitude at input and output of the snubber. A comparative study of pressure and amplitude by experiment, regrssion model and CFD model are performed for 35, 40 and 45hz motor frequency. These models results are varied by 0.844%, 0.117% and 0.475% from the experiment for those motor frequencies.The pressure losses in the snubber are also found almost similar values by the model i.e. 0.024%, 0.030% and 0.016% deviations.