THE EFFECT OF IMPURITIES DUE TO ABLATION ON THE ELECTRON NUMBER DENSITY OF AIR PLASMA

Citation
Nn. Pilyugin et Eb. Rudnyi, THE EFFECT OF IMPURITIES DUE TO ABLATION ON THE ELECTRON NUMBER DENSITY OF AIR PLASMA, High temperature, 34(3), 1996, pp. 349-358
Citations number
20
Categorie Soggetti
Physics, Applied
Journal title
ISSN journal
0018151X
Volume
34
Issue
3
Year of publication
1996
Pages
349 - 358
Database
ISI
SICI code
0018-151X(1996)34:3<349:TEOIDT>2.0.ZU;2-M
Abstract
The results are given of calculations of the equilibrium composition i n N-O-K-Mo(W)-C-H systems at a pressure of 1 atm and temperature rangi ng from 1600 to 5600 K, characteristic of the conditions in the bounda ry layer near a body performing hypersonic motion in the atmosphere. T he effect of the concentration of impurities (C, H, K, W, Mo) on the e lectron number density in the air plasma is investigated. It is found that, up to a temperature of 3000 K for molybdenum and 3500 K for tung sten, the addition of metals (0.1-5%) leads to appreciable reduction o f the electron number density in mixtures of air with additives (C, H, K). In so doing, the carbon and hydrogen content in the system should not exceed 5%. These phenomena may affect the propagation of radiowav es in the plasma near the body. The problem of simulating the ablation of W and Mo during entry of the body into the atmosphere is discussed .