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

Download

Soner Bilyaz MSc Thesis.pdf

Date

2023-1-23

Author

Bilyaz, İbrahim Soner

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

216
views

280
downloads

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

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Experimental investigation of surface roughness effects on the flow boiling of R134a in microchannels Jafari, Rahim; Okutucu Özyurt, Hanife Tuba; Ünver, Hakkı Özgür; Bayer, Özgür (2016-12-01) This study experimentally investigates the effect of surface roughness on the hydrodynamic and thermal performance of microchannel evaporators. Three micro-evaporators of the same dimensions and different surface roughness have been fabricated by micro-WEDM. Each micro-evaporator consists of forty rectangular microchannels of 700 mu m height, 250 mu m width, and 19 mm length. A microscale vapor compression refrigeration cycle has been constructed to carry out the experiments. R134a is used as the refrigeran...
ADJOINT BASED SHAPE OPTIMIZATION OF SEMI-SUBMERGED INLETS AND DEVELOPMENT OF A NOVEL BOUNDARY LAYER DIVERTER Küçük, Umut Can; Tuncer, İsmail Hakkı; Department of Aerospace Engineering (2022-12-28) In this study, boundary layer ingesting and diverting submerged air inlets are design optimized with an adjoint-based optimization methodology based on RANS solu tions. The opensource SU2 software is employed for both RANS and adjoint solutions and for driving the gradient-based optimization. Total pressure recovery at the aerodynamic interface plane is taken as the main objective of the optimization, and the mass flow rate and the momentum distortion are closely monitored. It is first shown that the shape ...
Analytical and Experimental Investigations of a New Hysteretic Damper Dicleli, Murat (2012-09-24) In this paper, analytical and experimental studies into the behavior of a new hysteretic damper, designed for seismic protection of structures is presented. The Multidirectional Torsional Hysteretic Damper (MTHD) is a recently-patented invention in which a symmetrical arrangement of identical cylindrical steel cores is so configured as to yield in torsion while the structure experiences planar movements due to earthquake shakings. The new device has certain desirable properties. Notably, it is characterize...
Experimental study of wave characteristics on a thin layer of de/anti-icing fluid Özgen, Serkan; Sarma, GSR (2002-10-01) Several series of experiments were conducted in order to investigate wave formation and wave characteristics on a thin layer of de/anti-icing fluid using a nonintrusive technique. The configuration consists of a thin layer of de/anti-icing fluid deposited on the lower wall of the wind tunnel section, sheared by a turbulent airflow. Beyond a critical value of the wind speed, two-dimensional surface waves could be observed. The characteristics of these waves like the wavelength and the wave speed could be mea...
Experimental and Computational Investigation of Vortex Formation in a Vertical Intake Structure Aydın, İsmail; Köken, Mete (2013-09-13) Vortex formation in the head pond of a hydroelectric power plant has been studied experimentally in a scaled hydraulic model. Velocity vector field and the turbulent kinetic energy distributions were measured using an Acoustic Doppler Velocimetry (ADV). Free surface flow in the head pond was also simulated using Flow-3D software. Comparison of measured and computed flow variables were satisfactorily good, promising the use of CFD tool to identify surface vortex and calculate its strength from the numerical ...

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.