q(r1) at any observed pbint (point A, figure 2a) can be obtained by differen- tiating of recorded temperature signal Ts(r) of spheric thermocouple (with radius R).
CONTACT METHODS FOR DIAGNOSTICS OF THERMAL PLASMA P. Stefanovij, P. Pavlovij, M. Jankovij, S. Oka
To cite this version: P. Stefanovij, P. Pavlovij, M. Jankovij, S. Oka. CONTACT METHODS FOR DIAGNOSTICS OF THERMAL PLASMA. Journal de Physique Colloques, 1990, 51 (C5), pp.C5-281-C5-288. .
HAL Id: jpa-00230841 https://hal.archives-ouvertes.fr/jpa-00230841 Submitted on 1 Jan 1990
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COLLOQUE DE PHYSIQUE Colloque C5, suppl6ment au n018, Tome 51, 1 5 septembre 1990
CONTACT METHODS FOR DIAGNOSTICS OF THERMAL PLASMA P.Lj.
STEFANOVIC, P.B. PAVLOVI~,M.M.
JANKOVIC? and S.N.
OKA
Institut for Nuclear Sciences "Boris KidriC", vinCa Institut for Thermal Sciences and Energy Research, P.O. Box 522, 11001 Belgrade. Yugoslavia
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On p r u t e dans ce papier l e principe de mesure, ainsi que des exemples d'applications possibles, pour l e s mathodes de mntact suivantes: l/ sorde enthalpique (calorim6riie), 2/ sonde de Pitot mobile, 3/ -le mobile. Les deux premikes n&hcdes sont directement inspdu tube de Pitot. Ia t r o i s i h ethode consiste en dew passages oil plus avec un 616rmt sensible de 1 -e l e long de l'i%mlemmt. lb plus de l a description d&ta.ill& de m e m&hode, on p r k t e quelques r6sultats exp6rheataux pour un j e t plasma air-azote 8 l a sortie de l a tomhe.
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Abstract I n t h i s paper p r i n c i p l e of measurement, t o g e t h e r with i l l u s t r a t i v e examples of p o s s i b l e a p p l i c a t i o n s , a r e presented f o r t h e following c o n t a c t methods: 1) enthalpy ( c a l o r i m e t r i c ) probe, 2 ) f l y i n g P i t o t L p r o b e , 3 ) f l y i n g thermocouple. Calorimetric o r enthalpy probe i s , i n f a c t , water cooled Pitot-probe f o r d i r e c t measurement of s t a g n a t i o n p r e s s u r e and s t a g n a t i o n enthalpy. Dynamic method of f l y i n g Pitot-probe enables a b r i e f c o l l e c t i n g of experimental d a t a and implies good dynamic c h a r a c t e r i s t i c s of pneumatic p a r t of measuring system. Measuring of plasma flow temperature by flying or dynamic thermooouple, c o n s i s t s of two o r more passings with s e n s i t i v e element of thermocouple along t h e diameter of t h e flow. Besides t h e d e t a i l e d d e s c r i p t i o n of each method, some experimental r e s u l t s a r e presented f o r a i r - n i t r o g e n plasma j e t a t t h e e x i t of t h e experimental plasma t o r c h . 1. INTRODUCTION
Term of thermal o r dense plasma i s r e l i e d with p a r t i a l l y d i s s o c i a t e d o r i o n i zed gas, b u t n o t s o r a r e f i e d t h a t r a d i a t i o n processes of energy t r a n s f e r becomes dominant compared t o p a r t i c l e s c o l i s i o n processes. Term of thermal plasma is c l o s e l y connected with t h e condition of l o c a l thermodynamic e q u i l i b r i u m (LTE) which implies unique value of temperature f o r every p a r t i c l e a t one s i n g l e p o i n t . Greater d e v i a t i o n s from e q u i l i b r i u m plasma should be expected a t lower .pressures (
