Experimental and numerical investigation of a counter-rotating boundary layer ingesting propulsion system

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Soner Bilyaz MSc Thesis.pdf

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2023-1-23

Author

Bilyaz, İbrahim Soner

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This study investigates the performance of a boundary layer ingesting (BLI) propulsion system with a counter-rotating propulsor numerically and experimentally. The main benefit driver for a BLI propulsion system is that the propulsor ingests the boundary layer of the aircraft's fuselage, which is slower than the free stream velocity and consumes less power to generate the required thrust. The power-saving coefficient (PSC), the amount of power saved to obtain the same net streamwise force compared to the traditional podded configurations, is used to quantify the amount of power saved in this configuration. For the calculation of the PSC, two different configurations are considered: isolated propulsor-isolated fuselage configuration (i.e., non-BLI configuration) and combined propulsor-fuselage configuration (i.e., BLI configuration). The relationship between the power input and the net streamwise force is obtained for each configuration, and the PSC values are calculated. A numerical analysis is performed to assess the benefit of using a counter-rotating propulsor over a single-fan propulsor in the BLI environment. The results show that 3% power saving is obtained for the cruise condition (i.e., zero net streamwise force) in the counter-rotating concept compared to the single propulsor case, in addition to the 16% power saving obtained for the counter-rotating BLI concept compared to the non-BLI counter-rotating configuration. It is found that the main benefit driver for the counter-rotating concept stems from the recovery of the swirl. The variation of the axial distance between the propulsors in the counter-rotating concept is also investigated, and no relation is found between the axial distance and the PSC values. An experimental setup is designed and produced to analyze the performance of the counter-rotating BLI concept. PSC values are calculated by considering the electrical power input of the fan and the load cell data. The results reveal that approximately 15% of the power is saved in the BLI configuration for the cruise condition.

Subject Keywords

Boundary layer ingestion, Counter-Rotating, Propulsion, Aerodynamics

URI

https://hdl.handle.net/11511/102468

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

İ. S. Bilyaz, “Experimental and numerical investigation of a counter-rotating boundary layer ingesting propulsion system,” M.S. - Master of Science, Middle East Technical University, 2023.