Abstract
The effect of orifice diameter ratio on the mixing qualities of unlike-doublet and split-triplet impinging elements is experimentally studied. The quality of mixing was checked by performing cold-flow tests with nonreacting immiscible simulant liquids. The local volume fractions are determined by direct measurement of the volume of each liquid. The test matrix comprises combinations of the orifice diameter ratios from 1 to 1.5, with the jet momentum ratios (oxidizer/fuel) in the range of 0.5-6. Results show that impinging elements of unequal orifice diameters exhibit substantially different mixing qualities. Maximum mixing efficiency occurs at higher momentum ratios with increasing diameter ratio. Relative jet velocity ratio for optimum mixing ranges from 0.65 to 0.78 and from 0.87 to 0.92 for unlike-doublet and split-triplet elements, respectively. The split-triplet element is superior to the unlike-doublet element in both the mixing efficiency and the mixing-controlled characteristic velocity in the test range of interest. The diameter ratio effect on the mixing of split-triplet element is less significant than that on the unlike-doublet element mixing. The mixing factor of the split-triplet element for maximum mixing efficiency is 0.75.
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