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Particle characterization in rocket exhaust plumes
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Fisher, J. Scott Callen Jr., E. Eugene |
| Copyright Year | 1997 |
| Description | A method to characterize particles in rocket exhaust plumes is developed. The particle velocity, size, and material composition are determined from crater characteristics resulting from impacts into aluminum and copper targets passed through the plume. The targets are mounted on a steel arm approximately 21 inches (53 cm) long which is rotated through the plume at sufficient velocity to prevent material failure resulting from thermal effects. A Scanning Electron Microscope (SEM) with secondary x-ray detectors is used to determine the particle material, and a standard optical measurement microscope is used to determine the crater diameter and depth. The crater diameter and depth are used in turn, as inputs to a ballistics computer code to estimate the velocity and size of the particle. The target has a safe residence time in the plume of approximately 50 ms before reaching an unacceptably high temperature. The = must mach a velocity of 104 ft/s (32 m/s) before entering the plume to produce the design residence time of 20 ms. The arm is actuated by a torsion spring with a 5-inch (13 cm) outer diameter, 0.625-inch (16 mm wire diameter, and 11 coils. A prototype of the entire rocket exhaust particle impact characterization system (PICS) was constructed and statically tested. |
| File Size | 4854401 |
| Page Count | 150 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20040065827 |
| Archival Resource Key | ark:/13960/t6rz46h90 |
| Language | English |
| Publisher Date | 1997-07-01 |
| Access Restriction | Open |
| Subject Keyword | Spacecraft Propulsion And Power Optical Measurement Scanning Electron Microscopy Particle Size Distribution X Ray Detectors Craters Exhaust Gases Rocket Exhaust Ballistics Plumes Computer Programs Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
