Micro-thermometers

SHAMRC Simulation

Challenge

Pressure and temperature time histories associated with explosive detonations are of particular interest to the military, but measurements are difficult because of short timescales and massive turbulence generated by the gas flows. While some current methods do probe the ‘inside’ of the fireball, they are either too slow, or fail too quickly to record temperatures associated with the entire event.

Solution

To overcome some of these difficulties, micron-sized temperature sensing particles were designed by Washington State University (WSU) with the expectation that these sensors would flow with the expanding fireball and measure the temperature of the hot gases within the time-scales of the dynamically changing temperatures.  To understand how they would behave and what environment they would experience, ARA modeled these sensors in a dynamic blast environment.  ARA used the two-phase particulate flow models within the SHAMRC high-fidelity multi-physics code to simulate sensor motion, heating and thermal response after a detonation.

Impact

Through these high-fidelity SHAMRC simulations, ARA was able to identify improvements necessary to make the sensors a viable data collection technique.

Micro-thermometers temperature
Test and Evaluation

Weapons Development, Testing, and Effects

From penetration and detonation underground, to air-blast, to a nuclear attack against U.S. satellites in space, ARA scientists and engineers... more