Effect of orifice diameter ratio on the mixing characteristics of unlike impinging injectors

Yong Ho Cho, Seong Woong Lee, Woong Sup Yoon, Young Soo Kim

Research output: Contribution to conferencePaper

Abstract

An experimental study is conducted to investigate the effect of orifice diameter ratio on the mixing qualities of unlike doublet and split triplet impinging elements. Spray of non-reacting immiscible waterkerosene liquids is intercepted and collected using a patternator. The local volume fractions are determined by direct measurement of the volume of each component and averaged to find representative liquidphase mixing and mixing-controlled combustion efficiencies. The orifice diameter ratios from 1 to 1.5 combined with the jet momentum ratios in the range of 0.5 to 6 are examined. Impinging elements of unequal orifice diameters exhibits substantially different mixing qualities. Mixing efficiency reaches its peak at higher momentum ratios as the diameter ratio increases over unity, and the relative jet velocity ratio for optimum mixing lies in the range of 0.65 ~ 0.7 and 0.85 ~ 0.9 for unlike doublet and split triplet elements, respectively. Split triplet element is superior to unlike doublet element in both the mixing and the mixing-controlled combustion efficiencies in the test range of interest. The diameter ratio effect on the mixing of split triplet element is less significant than on the unlike doublet element mixing. Mixing factor of the split triplet element for optimum mixing is 0.75.

Original languageEnglish
Publication statusPublished - 2002
Event40th AIAA Aerospace Sciences Meeting and Exhibit 2002 - Reno, NV, United States
Duration: 2002 Jan 142002 Jan 17

Other

Other40th AIAA Aerospace Sciences Meeting and Exhibit 2002
CountryUnited States
CityReno, NV
Period02/1/1402/1/17

All Science Journal Classification (ASJC) codes

  • Space and Planetary Science
  • Aerospace Engineering

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    Cho, Y. H., Lee, S. W., Yoon, W. S., & Kim, Y. S. (2002). Effect of orifice diameter ratio on the mixing characteristics of unlike impinging injectors. Paper presented at 40th AIAA Aerospace Sciences Meeting and Exhibit 2002, Reno, NV, United States.