서지주요정보
난류확산 화염에서의 차등확산의 영향에 관한 연구 = A study on the differential diffusion effects in the turbulent diffusion flames
서명 / 저자 난류확산 화염에서의 차등확산의 영향에 관한 연구 = A study on the differential diffusion effects in the turbulent diffusion flames / 이병무.
저자명 이병무 ; Lee, Byung-Moo
발행사항 [서울 : 한국과학기술원, 1988].
Online Access 원문보기 원문인쇄

소장정보

등록번호

4105316

소장위치/청구기호

학술문화관(문화관) 보존서고

DME 8811

SMS전송

도서상태

이용가능

대출가능

반납예정일

초록정보

A Study on the differential diffusion caused by the difference in the molecular diffusivities in turbulent H-Air diffusion flame in coaxial air jet is investigated. The approach is to use the perturbation method based on the conventional conserved scalar approach. Turbulent momentum fluxes are represented by turbulence model. The turbulence models used are:Algebraic stress model, standard kε model and Rodi's corrected k-ε model. The scalar fluctuations are represented the clipped Gaussian P.D.F with mixture fraction. The species equations are closed by the combustion model. The combustion models used are:chemical equilibrium model, eddy break-up model and Arrhenius model. The computational results considering the differential diffusion for Re=4200 are better predicted than those which don't consider it. Because of the differential diffusion of hydrogen, the hydrogen concentration decays more rapidly than that of equal diffusivity theory, so temperatures rise more rapidly and formation rates of H 0 therefore increase a long axis between 0-150 mm. Turbulence models are tested at Re=4200 and Re=11000. As a result, at Re=4200, the algebraic stress model is superior near the initial region, but at downstream, the Rodi's k-ε model predicts the experiments well, but there is little difference between Rodi's model and standard k-ε model. As the Reynolds number increases to Re=11000, the standard model is better than the other models. This is thought to be in local equilibrium of turbulence at high Reynolds number. Arrhenius model predicts greatly the temperature, and $H_2O$ concentrations than Magnussen's eddy break model. The effects of nozzle wall thickness and axial diffusion become apparent, and they are dicussed, The two methods of averaging are discussed, and additionally, discussions are made about the validity of p.d.f. model.

서지기타정보

서지기타정보
청구기호 {DME 8811
형태사항 [viii], 131 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Byung-Moo Lee
지도교수의 한글표기 : 신현동
지도교수의 영문표기 : Hyun-Dong Shin
학위논문 학위논문(박사) - 한국과학기술원 : 기계공학과,
서지주기 참고문헌 : p. 71-80
주제 Flame.
Thermal diffusivity.
Perturbation (Quantum physics)
Combustion engineering.
확산 연소. --과학기술용어시소러스
난류 확산. --과학기술용어시소러스
확산 속도. --과학기술용어시소러스
섭동법. --과학기술용어시소러스
모델링. --과학기술용어시소러스
Turbulence.
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