Blast Waves in a Room: Impact on Standing Behind Large Machine

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In a scenario where a dozen stun grenades detonate in a room measuring 10m by 5m by 4m, the individual positioned behind a large machine in the center would experience significant effects from the blast waves. While shrapnel would not pose a threat due to the design of modern stun grenades, which do not fragment upon explosion, the individual would still be subjected to intense sound and light. The blast waves would reflect off the walls, potentially amplifying the auditory and visual impact. The size of the room offers some protection, but the experience could be akin to being near a detonating grenade, resulting in temporary deafness and possible blindness. Historical context, such as the 20 July plot involving Adolf Hitler, illustrates that even with protective barriers, individuals can sustain injuries from blast waves, though the explosive power of stun grenades is significantly lower than that of traditional explosives.
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No i don't want to blow up anything, just wonder about story possibilities, solely for writing.
Lets suppose that dozen stun grenades blows in a room, that is at least 10m long, 5m wide, 4m tall, with a large machine(generator) in the middle, the majority of the grenades not so far from the entry door.
What would someone at the other end of the room, behind the machine, experience?
While no shrapnels could hit him, but blast waves reflects from the walls, and stun greandes operates with blast waves. Could the sizes of the room be enough protection, or it would be similar to standing next to a detonating grenade?
 
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newjerseyrunner said:
Something very similar happened to Adolf Hilter: https://en.wikipedia.org/wiki/20_July_plot 4 of the people in the room were killed, Hilter only suffered some minor injuries and a blown out ear drum.
In this case, the walls didnt stand, so no reflected waves, although it is still useful, that some wood was enough to protect from worst of the blast.
 
newjerseyrunner said:
Something very similar happened to Adolf Hilter: https://en.wikipedia.org/wiki/20_July_plot 4 of the people in the room were killed, Hilter only suffered some minor injuries and a blown out ear drum.

In that case there was over a kilo of plastic explosive in the room. GTOM is talking about multiple (for some reason) stun grenades. Their explosive power is a lot lower.
 
Ryan_m_b said:
In that case there was over a kilo of plastic explosive in the room. GTOM is talking about multiple (for some reason) stun grenades. Their explosive power is a lot lower.

Attackers are a police force they don't wield HE usually. Although probably escapees blow their own bomb near to the entryway when they break in.
 
The casing of modern stun grenades doesn't fragment when the grenade explodes. The blast is mostly contained within the casing, and holes are cut out of the casing so that sound and light from the explosion can escape. So anyone in the room but out of LOS will still experience a deafening sound and may be blinded for several seconds depending on how well the walls reflect the light, how cluttered the room is, and a number of other details.
 

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