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Mixing Characteristics of Turbulent Twin Impinging Axisymmetric Jets at Various Impingement Angles

Landers, Brian D
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1467987856

Abstract Details

2016, MS, University of Cincinnati, Engineering and Applied Science: Aerospace Engineering.
An experimental study is first presented on the comparison between two commonly used velocity measurement techniques applied in experimental fluid dynamics: Constant Temperature Anemometry (CTA) and Particle Image Velocimetry (PIV). The comparison is performed in the near-field region of an axisymmetric circular turbulent jet where the flow field contains large scale turbulent structures. The comparison was performed for five Reynolds numbers, based on diameter, between 5,000 and 25,000. The Reynolds numbers selected cover the critical Reynolds number range, 10,000 to 20,000 where the characteristics of the flow transition to a fully developed turbulent mixing layer. A comparison between these two measurement techniques was performed in order to determine the differences between an intrusive (CTA) and non-intrusive (PIV) method when applied to a practical application. The results and observations obtained from the comparison between the two techniques were applied to better characterize the time-averaged characteristics of a single axisymmetric turbulent jet with a Reynolds number of 7,500. The mean and fluctuating velocities, turbulent kinetic energy (TKE), and vorticity were measured as a baseline case. Additionally, smoke visualization was utilized to determine the mixing characteristics of the transient start of an axisymmetric turbulent jet. The shedding frequencies, also known as, the `preferred mode’ were investigated for a single jet. Particle Image Velocimetry (PIV) was also utilized to characterize the pre-and post-regions of the interaction region of two axisymmetric, incompressible turbulent jets at included angles: 30, 45, and 60 degrees. The Reynolds number selected (7,500) was within the range of critical Reynolds numbers and the geometrical distance to twin jet impingement, X0, remained constant at 10.33D for each impingement angle. The mean and fluctuating velocities, vorticity, and turbulent kinetic energy (TKE) were measured. Smoke Visualization was utilized to measure the mixing characteristics of impinging jets during the transient start as well as when the jets had reached a steady state condition.
Peter Disimile, Ph.D. (Committee Chair)
Shaaban Abdallah, Ph.D. (Committee Member)
Milind Jog, Ph.D. (Committee Member)
241 p.
Aerospace Materials
Impinging Jets; Axisymmetric Turbulent Jet; Particle Image Velocimetry; Constant Temperature Anemometry; Hotwire Anemometry; Turbulent Flow

Recommended Citations

Citations

  • Landers, B. D. (2016). Mixing Characteristics of Turbulent Twin Impinging Axisymmetric Jets at Various Impingement Angles [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1467987856

    APA Style (7th edition)

  • Landers, Brian. Mixing Characteristics of Turbulent Twin Impinging Axisymmetric Jets at Various Impingement Angles. 2016. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1467987856.

    MLA Style (8th edition)

  • Landers, Brian. "Mixing Characteristics of Turbulent Twin Impinging Axisymmetric Jets at Various Impingement Angles." Master's thesis, University of Cincinnati, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1467987856

    Chicago Manual of Style (17th edition)

ucin1467987856
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This open access ETD is published by University of Cincinnati and OhioLINK.