Evaluation of a Mass Spectrometer Probe for Density and Velocity Distribution Measurements in a Rocket Exhaust Plume
Final rept. 17 Oct 1969-Jun 1970
ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN
Pagination or Media Count:
The evaluation of a mass spectrometer probe in a highly expanded exhaust plume of a small rocket is described in this report. This probe, which utilizes a quadrupole mass spectrometer, is used for species identification and concentration measurements and for velocity distribution measurements. The probe maintains a compatible pressure environment for the spectrometer during rocket firings and generates a molecular beam which is representative of the plume gas dynamic state at a given sampling point. The modulated beam technique for both density and velocity distribution measurements is described. The important criteria for the design of the more important features are discussed. Sample data from calibration sources and the thruster are presented along with analysis of the data as it relates to parameter spatial dependence and kinetic temperatures calculated from the velocity distributions.
- Test Facilities, Equipment and Methods