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A novel multi-fidelity optimization framework for high-altitude propellers

Aerospace Science and Technology, ISSN: 1270-9638, Vol: 153, Page: 109407
2024
  • 2
    Citations
  • 0
    Usage
  • 8
    Captures
  • 1
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    2
  • Captures
    8
  • Mentions
    1
    • News Mentions
      1
      • News
        1

Most Recent News

Reports from Royal Military Academy Highlight Recent Findings in Aerospace Research (A Novel Multi-fidelity Optimization Framework for High-altitude Propellers)

2024 OCT 08 (NewsRx) -- By a News Reporter-Staff News Editor at Defense & Aerospace Daily -- Investigators discuss new findings in Aerospace Research. According

Article Description

A novel optimization methodology is presented for optimizing high-altitude propellers operating in the lower stratosphere. The proposed methodology combines a Bayesian optimization approach for most design variables and Vortex Theory for the optimization of twist distribution and rotational velocity. For the Bayesian optimization part of the problem, a multi-fidelity approach is employed with three levels of modeling fidelity. The considered fidelity levels, from lower to higher, are: Vortex Theory, and 3D Reynolds-Averaged Navier-Stokes (RANS) with the use of γ−Reθ transition model, converged with first-order upwind, and second-order upwind for the momentum equations. Additionally, the optimization problem involves two objectives: maximizing the cruise efficiency and minimizing the total volume of the propeller. To enhance the performance of multi-fidelity, multi-objective (MFMO) acquisition functions, a novel algorithm is proposed. The proposed optimization methodology demonstrates its effectiveness in generating several high-performing propeller designs and proves to be more efficient than an equivalent problem formulation relying solely on Bayesian optimization. Post-processing of optimization data reveals new design variable bounds that correspond to more efficient blade shapes. These findings provide insights into some important geometric features of high-altitude propellers and establish guidelines for future optimization efforts within the specified thrust and power consumption ranges. Finally, simulations of the best-performing designs across a range of advance ratios and altitudes confirm their high performance in various operating conditions.

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