국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Numerical Simulation of a Low Emissions Gas Turbine Combustor Using KIVA-II Part II: Quick-Quench/Lean-Combustion Zones Analysis
저자	S.L. Yang, R. Chen, and M.C. Cline
Keyword	Gas turbine combustors; CFD; Emissions; Dilution jet mixing
URL	http://gltrs.grc.nasa.gov/reports/1997/CR-204140.pdf
보고서번호	NASA CR-204140
발행년도	1997
출처	NASA Glenn Research Center
ABSTRACT	This is the second part of the numerical investigation on a low emissions staged turbine combustor (STC) using a modified version of the KIVAII code. The main focus of this study is the numerical analysis of the reacting fluid flow and heat transfer inside the quickquench/leancombustion (QQ/LC) zones. In the QQ zone, cool dilution air was injected into the hot mixture through eight 45?inclined slots with a momentum flux ratio of 60. The slot aspect ratio was 6 and the jettomainstream mass flow rate ratio was 3. The inlet conditions of the QQ zone were obtained from the results of rich combustion zone analysis described in part I. A tension spline interpolation scheme was then used to interpolate the necessary information needed at the inlet. Conditions at the slot opening (dilution jet) were chosen closely related to those encountered in advanced combustion systems. The Grid system needed for the numerical solutions was generated by a transfinite interpolation scheme. KIVAII was further modified for the current study. Preliminary results illustrate some of the major features of the flow and temperature fields inside the QQ/LC zones. Formation of the co and counterrotating bulk flow and the sandwichedringshape temperature field, typical of the confined inclined jetincross flow, can be seen clearly and is consistent with experimental observations. The calculations of the massweighted standard deviation and the pattern factor of temperature revealed that the mixing performance of the STC combustor is very promising. The temperature of the fluid leaving the LC zone is very uniform. Prediction of the NOx emission index showed that there was no excessive thermal NOx produced in the QQ/LC zones for the case studied. From the results obtained so far, it appears that the modified KIVAR code can be used to guide the low emission combustion experiments.