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Mechanical Engineering

2019

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Mechanical Engineering Conference Presentations, Papers, and Proceedings

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Computational Finite Element Analysis Of Adaptive Gas Turbine Stator-Rotor Flow Interactions For Future Vertical Lift Propulsion, Nikita Kozak, Luis Bravo, Muthuvel Murugan, Anindya Ghoshal, Yu Yu Khine, Yuri Bazilevs, Ming-Chen Hsu Aug 2019

Computational Finite Element Analysis Of Adaptive Gas Turbine Stator-Rotor Flow Interactions For Future Vertical Lift Propulsion, Nikita Kozak, Luis Bravo, Muthuvel Murugan, Anindya Ghoshal, Yu Yu Khine, Yuri Bazilevs, Ming-Chen Hsu

Mechanical Engineering Conference Presentations, Papers, and Proceedings

The objective of this work is to computationally investigate the impact of an incident-tolerant rotor blade concept on gas-turbine engine performance under off-design conditions. Currently, gas-turbine engines are designed to operate at a single condition with nearly fixed rotor speeds. Operation at off-design conditions, such as during hover flight or during takeoff, causes the turbine blade flow to excessively separate introducing performance degradations, excessive noise, and critical loss of operability. To address these issues, the benefits of using an incidence-tolerant rotor blade concept is explored based on a novel concept that articulates the rotating turbine blade synchronously with the stator ...


Optimization Of High-Speed White Beam X-Ray Imaging For Spray Characterization, Timothy B. Morgan, Julie K. Bothell, Thomas J. Burtnett, Danyu Li, Theodore J. Heindel, Alberto Aliseda, Nathanael Machicoane, Katarzyna Matusik, Alan L. Kastengren Jan 2019

Optimization Of High-Speed White Beam X-Ray Imaging For Spray Characterization, Timothy B. Morgan, Julie K. Bothell, Thomas J. Burtnett, Danyu Li, Theodore J. Heindel, Alberto Aliseda, Nathanael Machicoane, Katarzyna Matusik, Alan L. Kastengren

Mechanical Engineering Conference Presentations, Papers, and Proceedings

The near-field region of a spray has a significant impact on the downstream dynamics. However, the near-field region remains one of the most difficult areas to characterize due to its optical density to visible light. One of the methods used to probe the near-field region is high-speed white beam (broad-spectrum) X-ray radiography, which generates path integrated, time sequenced images of the spray. While white beam imaging is effective at probing the near-field region, high intensity synchrotron sources are required to acquire high-speed time-resolved image sequences. The drawback to a synchrotron source is it emits a significant portion of its X-ray ...


Statistical Analysis Of Focused Beam Radiographs Taken From A Coaxial Airblast Spray, Julie K. Bothell, Danyu Li, Timothy B. Morgan, Theodore J. Heindel, Nathanael Machicoane, Alberto Aliseda, Alan L. Kastengren Jan 2019

Statistical Analysis Of Focused Beam Radiographs Taken From A Coaxial Airblast Spray, Julie K. Bothell, Danyu Li, Timothy B. Morgan, Theodore J. Heindel, Nathanael Machicoane, Alberto Aliseda, Alan L. Kastengren

Mechanical Engineering Conference Presentations, Papers, and Proceedings

Studying the near-field region of sprays is particularly challenging because it is optically dense. However, energy in the X-ray range is capable of penetrating this dense region and obtaining information that would otherwise be unavailable. Through time-resolved X-ray radiography, a better understanding of the near-field region is currently being developed. The 7-BM beamline at the Advanced Photon Source at Argonne National Lab was focused down to a 5 x 6 μm cross-sectional area. The attenuation in the beam, which is used to calculate the effective path length of liquid, was then collected at an effective rate of 270 kHz for ...


Measurement Of Liquid Core Length Of A Coaxial Two-Fluid Spray, Danyu Li, Julie K. Bothell, Timothy B. Morgan, Theodore J. Heindel, Nathanael Machicoane, Alberto Aliseda, Alan L. Kastengren Jan 2019

Measurement Of Liquid Core Length Of A Coaxial Two-Fluid Spray, Danyu Li, Julie K. Bothell, Timothy B. Morgan, Theodore J. Heindel, Nathanael Machicoane, Alberto Aliseda, Alan L. Kastengren

Mechanical Engineering Conference Presentations, Papers, and Proceedings

Shadowgraphs, tube-source X-ray radiographs, and synchrotron X-ray radiographs from a coaxial two-fluid spray are analyzed to measure the liquid core length of the spray. Two flow conditions: Rel = 1,100, Reg = 21,300, We = 40, and Rel = 1,100, Reg = 46,700, We = 196 are investigated. The standard deviation of the fluctuating intensity values are calculated and analyzed to estimate the liquid core length. Additionally, the largest connected domain is used to find an instantaneous breakup position of the spray. The results show that the high standard deviation region is related to the ligament development region, and the instantaneous position ...