국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Surface Catalysis and Oxidation on Stagnation Point Heat Flux Measurements in High Enthalpy Arc Jets
저자	Nawaz, Anuscheh;; Driver, David M.;; Terrazas-Salinas
Keyword	ARC HEATING;; CALORIMETERS;; CATALYSIS;; CONSTANTAN;; COPPER OXIDES;; ENTHALPY;; GOLD;; HEAT FLUX;; NICKEL;; OXIDATION;; PLATINUM;; SILICON DIOXIDE;; STAGNATION POINT
URL	http://hdl.handle.net/2060/20130000651
보고서번호	ARC-E-DAA-TN6592
발행년도	2013
출처	NTRS (NASA Technical Report Server)
ABSTRACT	Heat flux sensors are routinely used in arc jet facilities to determine heat transfer rates from plasma plume. The goal of this study is to assess the impact of surface composition changes on these heat flux sensors. Surface compositions can change due to oxidation and material deposition from the arc jet. Systematic surface analyses of the sensors were conducted before and after exposure to plasma. Currently copper is commonly used as surface material. Other surface materials were studied including nickel, constantan gold, platinum and silicon dioxide. The surfaces were exposed to plasma between 0.3 seconds and 3 seconds. Surface changes due to oxidation as well as copper deposition from the arc jets were observed. Results from changes in measured heat flux as a function of surface catalycity is given, along with a first assessment of enthalpy for these measurements. The use of cupric oxide is recommended for future heat flux measurements, due to its consistent surface composition arc jets.