Bulletin of the American Physical Society
77th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 24–26, 2024; Salt Lake City, Utah
Session J30: Aerodynamics: Hydrokinetic and Propulsion Systems |
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Chair: Giacomo Valerio Iungo, University of Texas at Dallas Room: 255 B |
Sunday, November 24, 2024 5:50PM - 6:03PM |
J30.00001: [PLACEHODLER] ABSTRACT WITHDRAWN Daniel TestUser ASBTRACT WITHDRAWN |
Sunday, November 24, 2024 6:03PM - 6:16PM |
J30.00002: Experimental investigation of aerodynamic loading on rotor sails at full dynamic similarity Thelge S. D. Pieris, Alberto F Rius-Vidales, Albert A. K. Rijkens, John W Kurelek, Marcus Hultmark A major challenge in the research of rotor sails for wind-assisted propulsion on maritime vessels is the limited understanding of aerodynamic loading coefficients scaling with operational parameters. This knowledge gap stems from the lack of experimental and numerical results at conditions close to full-scale operational envelopes of rotor sails. The present study experimentally investigates the effect of Reynolds number (ReD), velocity ratio (λ), aspect ratio (AR), and tip effects on the lift and drag coefficient of a finite-span rotating cylinder. Experiments are conducted in the High Reynolds number Test Facility at Princeton University, where conditions close to full-scale and are achieved by varying flow velocity and density. Loads and power are measured for ReD ∈ [0.5,4.5] x 106 and λ ∈ [0,5] for various AR and endplate configurations. The results provide novel insight into scaling laws of loading and power coefficients over an unprecedented range of ReD and λ, providing a dataset that spans conditions achievable in the laboratory to full-scale rotor sail operation. This work lays a foundation in investigating rotor sails for wind-assisted ship propulsion systems aimed at reducing transport emissions. |
Sunday, November 24, 2024 6:16PM - 6:29PM |
J30.00003: Crossover between lifting surfaces and its similarity to gust interaction response Lokesh Silwal, Vrishank Raghav Multi-body interactions, especially the crossover between two lifting bodies, are common in different aerial vehicles and vertical-axis wind turbine applications. These interactions add periodic excursions to the loads, leading to vibrations and altering the system's acoustic signatures. A fundamental study of the crossover phenomena is required to understand its implications on operating systems. While fundamental studies have not been conducted to understand its impact, it shares some similarities with other fundamental unsteady problems, such as gust interactions. During the crossover between two lifting bodies, the induced transverse gust from one lifting surface could dictate the load response of the other. The focus of this study is to explore the similarities between the crossover and gust interaction problems at different operating conditions. We also explore the applicability of using unsteady linear theories to model the load response during the crossover. Experimental measures have been applied to conduct these studies in a hydrodynamic towing tank facility. Here, two wings were translated in opposite directions, leading to a single crossover event, and loads and flowfield were measured. The results show that the linear gust interaction models predict some aspects of the interactions during the crossover. The predictions from the linear models fail during phases when the lifting surfaces align and modify the flow features. |
Sunday, November 24, 2024 6:29PM - 6:42PM |
J30.00004: Investigation of low Reynolds number effects on a bidirectional hydrofoil for a tidal stream turbine Knut Erik Teigen Giljarhus A bidirectional airfoil design has recently been proposed to efficiently exploit both the ebb and flow of a tidal stream. As part of laboratory scale testing, it can be challenging to achieve the high Reynolds numbers of the full scale design. In this work, the low Reynolds number effects on the hydrofoil is considered. CFD simulations are performed using OpenFOAM, where the Bas-Cakmakcioglu algebraic transition model is implemented to investigate low-Reynolds number effects. The implementation is first validated by simulation of the E387 airfoil, before the new hydrofoil design is simulated. The results show the presence of a laminar separation bubble that affect the performance of the hydrofoil at low Reynolds numbers, and a new design is proposed to alleviate these effects. |
Sunday, November 24, 2024 6:42PM - 6:55PM |
J30.00005: Evaluating Aerodynamic and Propulsive Performance of a Wing with Distributed Electric Propulsion Eric P Sadoway, Sina Ghaemi Distributed electric propulsion (DEP) has gained significant attention in aviation research for its potential to enhance aerodynamic performance and enable propulsion-based control. These benefits are achieved by leveraging the aerodynamic interaction between strategically placed propellers of the DEP system and the lifting surfaces of the aircraft. To investigate the effects of DEP configuration on aircraft performance, an experimental wind tunnel investigation was conducted using an eight-propeller DEP system and a full-scale wing at a chord-based Reynolds number of 350,000. The DEP system was tested at several streamwise positions upstream, downstream and over the suction side of the wing. Individual propeller thrust was controlled to generate various thrust levels and distributions, resulting in a range of advance ratios from 0.5 to 0.9. Decoupled aerodynamic load measurements were obtained using a six-axis load cell for the wing and single-axis load cells for each propeller. The results demonstrated that propeller position and operation conditions have an impact on wing aerodynamics and propeller performance that increases with propeller loading. This presentation will discuss these distinct relations with the goal of identifying an optimal DEP configuration. |
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