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김중배(Jung-Bae Kim),이권희(Kwon-Hee Lee),토시아키 세코구치(Toshiaki Setoguchi),김희동(Heuy-Dong Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
The present study addresses experimental results to investigate the details of the near field flow structures<br/> produced in the under-expanded, dual, coaxial, swirling, jet. The sonic/supersonic swirling jets are emitted<br/> from the sonic inner nozzle and the outer annular nozzle produce the co-swirling and counter swirling against<br/> the primary swirling jet, respectively. The interactions between both the secondary annular swirling and<br/> primary inner supersonic swirling jets are quantified by the pitot impact and static pressure measurements and<br/> visualized by using the Schliern optical method. The experiment is performed for different swirl intensity and<br/> pressure ratio. The results obtained show that the secondary co-swirling jet significantly changes the inner<br/> under-expanded swirling jet, such as the recirculation zone, pressure distribution, through strong interactions<br/> between both the swirling jets and the effects of the secondary counter-swirling jet is similar to the secondary<br/> co-swirl jet case.