Abstract
A turbulent round jet is experimentally manipulated using a pulsed periodic radial minjet placed near the nozzle exit. Empirical scaling analysis performed on the experimental data unveils that once decay rate $K$, mass flow rate ratio ${C}_{m}$ and duty cycle \ensuremath{\alpha} are corrected by their `true values' ${K}_{c}$, ${C}_{c}$ and \ensuremath{\alpha}${}_{c}$, the relationship $K$ = ${g}_{1}$(${C}_{m}$, \ensuremath{\alpha}) may be reduced to ${K}_{c}$ = ${g}_{2}$(\ensuremath{\xi}${}_{c}$ = ${C}_{c}$ /\ensuremath{\alpha}${}_{c}$), where ${g}_{1}$ and ${g}_{2}$ are different functions. The manipulated jet is further classified into five typical flow structures which are uniquely determined by the \ensuremath{\xi}${}_{c}$, which represents physically the effective penetration depth of the minijet.
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