국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Dilution Jet Mixing Phase I Program
저자	R. Srinivasan, A. Berenfeld, and H.C. Mongia
Keyword	Dilution-zone; Jet-mixing; Combustion
URL	http://gltrs.grc.nasa.gov/reports/1982/CR-168031.pdf
보고서번호	NASA CR-168031
발행년도	1982
출처	NASA Glenn Research Center
ABSTRACT	The main objective of the NASA Dilution Jet Mixing Phase I Program was to quantify by means of parametric tests the effect of the following on the mixing of a row of jets with a confined cross-flow. 1) Jet to mainstream density ratio; 2) Flow area convergence as encountered in transition sections; and 3) Non-uniform mainstream profile upstream of dilution orifices. The general conclusions derived from Phase I work are: 1) Jet spreading rate in transverse direction is increased with increasing J, H/D and with decreasing S/D; 2) The density ratio has only a second order effect on the jet mixing characteristics for a constant momentum ratio; 3) The temperature distributions in the jet mixing region are strongly influenced by the undisturbed mainstream profile. Therefore, a superposition of the mainstream profile on the correlations for isothermal mainstream conditions yields good agreement with data; and 4) Flow area convergence enhances mixing in radial and transverse directions. An asymmetric convergent duct with flat wall injection has the same jet mixing characteristics as a symmetric convergent duct. An asymmetric convergent duct with slant wall injection has a faster jet spreading rate in the transverse direction.