Measurement and Analysis of the HF Radiation from a Reacting Supersonic Jet.
Abstract
The spontaneous emission from HF infrared bands in the free jet of a continuous HF chemical laser with a slit nozzle bank has been measured at a number of downstream positions. Three cases are reported: high-power flow (1) that includes O2, (2) without O2, and (3) with reduced SF6. Spatially averaged number densities of the HF vibrational levels (v = 1, 2, 3, 4) have been determined for the zero-power case. Vibrational nonequilibrium is evident. Observed rotational temperatures range from 560 down to 400 degrees K. Gain coefficients are deduced. Data have been fitted to both a one-dimensional, constant-pressure streamtube jet model and a two-dimensional model; the best fit occurs with the latter. Deactivation plays an important role in determining the average gain. The principal deactivator of HF(v) is H. Other important deactivation mechanisms are vibration-vibration transfers with HF or H2. (Modified author abstract)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 15, 1973
- Accession Number
- AD0767193
Entities
People
- Munson A. Kwok
Organizations
- The Aerospace Corporation