The figure below provides sample holder schematics for solid composite and liquid propellant testing. A similar sample holder is used for pellet and liquid propellant testing, just modified for each sample size. This design is simple to remove and remount while being robust enough to handle the high fill pressures. The sample holder is a modified, 1-in-diameter bolt. Current is sent through the wire by a remotely latching a relay. The nichrome wire is strung across the propellant samples between two leads.
Propellant sample ignition for most experiments where precise ignition timing is not important is done with a nichrome wire. Photograph of the high-pressure strand burner facility at TAMU. Schematic of high-pressure strand burner facility at TAMU. An image of the high-pressure strand burner is shown below. Laser light at 10.6 μm from a 100-W CO 2 laser can be passed through this upper window for experiments where the cw laser is used to ignite the propellant samples. An additional window made of zinc sulfide (ZnS) is located at the top of the burner. These windows allow for several different optical diagnostics such as spectroscopy and high-speed videos. The vessel consists of a steel, cylindrical test chamber with an inner diameter of 94 mm (3.70 in) and a height of 203 mm (8.00 in) along with 3 windows spaced 90° apart. Inert gas, either Nitrogen or Argon, is used to pressurize the vessel for all propellant experiments. The strand burner is rated at 8000 psia (55.2 MPa) but most experiments are below 5000 psia. Additionally, the entire strand burner structure is located behind blast walls.
This infrastructure includes electronically controlled pneumatic fill and exhaust valves along with remote ignition.
As seen in the schematic below, this strand burner is capable of pressures in excess of 5000 psia (34.5 MPa) and contains the infrastructure for operating remotely. The high-pressure strand burner at TAMU became operational in 2005.
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