The most common methods are open field exposure, blast tubes for explosive damage, and shock tubes
with compressed air or gas. The third model has been frequently used because of its single shock wave factor without other injury mechanisms. Sophisticated shock tube
systems have been installed at the Walter Reed Institute, the United States Naval Medical Research Center, the Applied Physics Laboratory at Johns Hopkins University, and other institutions.,,, A novel methodology that subjects BINT models to excess pressures in vivo and in vitro through a drive chamber consisting of a flange connection has been reported. However, heavy gas cylinder and large volume chambers in the model may increase the complexity and danger of operation.
[63-65] derived correlations to relate the ignition delay-times of 1-hexene to changes of temperature and equivalence ratio by using shock tube
For one-dimensional shock tube
problem, there is a precision difference in the results of the two methods, but it is not too big.
There are many variations of shock tube
design but all share a basic two chamber concept.
Thereafter, an off-engine shock tube
test bench was used to create a simulated exhaust gas flow condition to investigate the impacts of the pressure wave and pulsating gas flow on the droplet breakup and spray distribution of an after-treatment injection using optical methods.
From the open literature, it can be concluded that various researchers have implemented different impulse facilities such as shock tube
and shock tunnel for measurement of force, heat transfer, or material testing.
The present shock tube
facility which has been described in details previously [20, 21] is consists of a 2000mm long driver section and a 7300mm long driven section, as shown in Figure 1.
Figure 8 presents the representative signals from the pressure transducers in the shock tube
reservoir and a location in the model surface, respectively.
NPL's facility is based on shock tube
techniques and secondary equipment.
The method chosen is a shock tube
technique, though other groups in other countries are trying to reach the same end using different methods.
To simulate normal reflections, the researchers used a one-dimensional (1D) domain CEL model of a shock tube
for the validation effort, because the relevant analytical equations for the compressible flow were readily available.