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Use of CFD to Validate and Predict the Jet Noise from a High Aspect-ratio Nozzle at Off-design Conditions

Selvaraj, Sudharshan
http://orcid.org/0000-0001-7962-3275
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1595850094240426

Abstract Details

2020, MS, University of Cincinnati, Engineering and Applied Science: Aerospace Engineering.
The objective of this work is to highlight and ascertain the significance of high aspect ratio nozzle studies through Computational Fluid Dynamics (CFD) as a diagnosis of existing design and as a means of future preliminary investigations to ensure the feasibility of such designs. The novelty of this work lies in the flow and acoustic calculations using a commercial code. The one used for this study is developed by Siemens, CD-Adapco, and is called Star CCM+. During the design phase of nozzles for real-world applications, along with understanding the flow behavior, fully knowing the dependence of noise performance on the nozzle geometry would help researchers identify and isolate tones that the human ears are less sensitive to. A single expansion ramp nozzle (SERN) is considered for this study here. Due to the throat aspect ratio being 9 it is also referred to as AR9. We will be investigating the jet flow field, the noise at over-expanded case (NPR 3), and comparing this behavior to under and ideal working conditions. The followed stages for the sound investigation here are - (a) LES flow study - to track the growth of unsteady structures and associated shock cell physics and (b) setting up an array of probe mics - to pick up the pressure disturbances in the flow. FW-H methodologies and Lighthill's acoustic analogy are collectively used to study far-field noise from near field sources. This process is repeated for all the different working conditions. Comparisons to existing experimental data, previous CFD approaches, and deductions from this study will be added to the depository of SERN high aspect ratio nozzle research.
Ephraim Gutmark, Ph.D. (Committee Chair)
Shaaban Abdallah, Ph.D. (Committee Member)
Mark Turner, Sc.D. (Committee Member)
73 p.
Aerospace Materials
CAA; Aero-acoustics

Recommended Citations

Citations

  • Selvaraj, S. (2020). Use of CFD to Validate and Predict the Jet Noise from a High Aspect-ratio Nozzle at Off-design Conditions [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1595850094240426

    APA Style (7th edition)

  • Selvaraj, Sudharshan. Use of CFD to Validate and Predict the Jet Noise from a High Aspect-ratio Nozzle at Off-design Conditions. 2020. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1595850094240426.

    MLA Style (8th edition)

  • Selvaraj, Sudharshan. "Use of CFD to Validate and Predict the Jet Noise from a High Aspect-ratio Nozzle at Off-design Conditions." Master's thesis, University of Cincinnati, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1595850094240426

    Chicago Manual of Style (17th edition)

ucin1595850094240426
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This open access ETD is published by University of Cincinnati and OhioLINK.