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Showing 1 to 20 of 30 for “"Boundary Layer Ingestion"”.
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Analysis of civil aircraft propulsors with boundary layer ingestion
… for fan turbomachinery conceptual design, for a boundary layer ingesting (BLI) propulsion system for advanced civil transport aircraft. For the former, configuration performance analysis shows BLI yields a reduction in mechanical power required to propel a given aircraft. For the latter, fan …
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A numerical investigation of s-duct flows with boundary-layer ingestion
… for a flush-mounted inlet with significant boundary-layer ingestion (BLI). In conjunction with a NASA-sponsored research grant, the aim is to further accumulate knowledge and insight on the effectiveness of flow control devices in reducing circumferential distortion. Using Computational …
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Aerodynamic benefits of boundary layer ingestion for the D8 double-bubble aircraft
… experimental assessments of the aerodynamic boundary layer ingestion (BLI) benefit of the D8 advanced civil aircraft design. Two independent methods were applied for 1:11 scale (4.1 m wingspan) powered aircraft model experiments in the NASA Langley 14x22-foot Subsonic Wind Tunnel. The metric …
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Quantification of the boundary layer ingestion benet for the D8-series aircraft using a pressure rake system
… Wind Tunnel to determine the aerodynamic boundary layer ingestion (BLI) benet for the D8 aircraft advanced transport concept. The experiments involved a back-to-back comparison between two D8 aircraft configurations: a podded propulsion system (non-BLI) and a fuselage integrated propulsion …
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Assessment of an Innovative Experimental Facility for Testing Diffusing Serpentine Inlets with Large Amounts of Boundary Layer Ingestion
… ground test facility was able to simulate the boundary layer profile expected to be ingested by inlets mounted on the aft sections of these aircraft. It generated Mach numbers ranging from 0.19 to 0.4 and boundary layer thicknesses between 36% and 45%. The circumferential distortions at the …
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Performance of a boundary layer ingesting propulsion system
… engines, in the presence of aircraft fuselage boundary layer ingestion (BLI). The emphasis is on defining the role that the turbomachinery (i.e., the fan, in the ultra high bypass engines considered) plays in establishing the flow benefit due to BLI. A three-dimensional body force approach to …
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Application of overset grids for aerodynamic assessment of an advanced civil transport aircraft
… of an advanced civil transport designed to use boundary layer ingestion (BLI). Comparison with wind tunnel results on unpowered configurations show that the computed and measured lift slopes agree within 15% and the drag at simulated cruise point to within 20%. Computations have been carried out …
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Evaluation of propulsor aerodynamic performance for powered aircraft wind tunnel experiments
… model of an advanced civil aircraft utilizing boundary layer ingestion (BLI); mechanical ow power is a surrogate for aircraft fuel burn. Back-to-back experiments of BLI and non-BLI aircraft configurations to assess the BLI benet directly measured electrical power, and supporting experiments …
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Hybrid wing-body aircraft noise and performance assessment
Hybrid wing-body aircraft noise generation and boundary layer ingestion (BLI) performance trends with increased fan face Mach number inlet designs are investigated. The presented topics are in support of the NASA subsonic fixed wing project, which seeks to lower noise and increase performance by …
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Experimental Investigation of Fan Rotor Response to Inlet Swirl Distortion
… One such design concept incorporates boundary layer ingestion which locates the turbofan engine inlet near enough to the lifting surface of the aircraft skin that the boundary layer is ingested and reenergized. This process reduces overall aircraft drag and associated required thrust, …
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Design of a model propulsor for a boundary layer ingesting aircraft
… of an advanced civil transport aircraft with boundary layer ingestion (BLI). The electrically powered single-stage propulsors represent the ultra-high bypass ratio turbofan engines on a full-scale conceptual aircraft previously designed at MIT. Powered models will use these propulsors in both …
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Trade-Space Analysis of Liquid Hydrogen Propulsion Systems for Electrified Aircraft
… systems leveraging superconducting motors, boundary layer ingestion, high-temperature PEM fuel cells, and liquid hydrogen fuel were examined. Aviation turbine fuel (ATF) and liquid hydrogen were compared using the payload-fuel energy intensity (PFEI), defined as the fuel energy required per …
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Flow analysis and control in a subsonic inlet
… MIT, on the selected off-design case of forebody boundary layer ingestion. The first set of experiments focused on the characterization of the inlet in a clean configuration. Then, a distortion device was added in order to simulate thick forebody boundary layer. This proved to have a strong …
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A Requirements analysis methodology for turboelectric aircraft
… enables novel airframe configurations, boundary layer ingestion, and distributed propulsion, each of which can reduce the amount of power and energy wasted during aircraft travel. In addition, it could reduce the aircraft noise. However, the drawbacks of switching to turboelectric …
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Trade space assessment of electrified commercial aircraft
… timeframe. The propulsive power reduction from boundary layer ingestion (BLI), a technology that could be enhanced by electrification, is characterized and bounded by power balance analysis. An aircraft system model extends this analysis to capture the weight and performance trades of …
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A Tail-Integrated Boundary-Layer Ingesting Propulsion System for Turbo-Electric Aircraft
… system for turbo-electric aircraft with boundary layer ingestion (BLI). This includes (i) definition of tail BLI electric fans and (ii) integration of the BLI propulsors on an aircraft tail, to meet the propulsive power requirements and performance goals, i.e. separation-free and …
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Measurements of Flow in Boundary Layer Ingesting Serpentine Inlets
… integrated airframe-propulsion systems featuring ingestion of the airframe boundary layer offer reduced noise, emissions, and fuel consumption. Embedded engine systems are envisioned which require boundary layer ingesting (BLI) serpentine inlets to provide the needed air ow to the engine. These …
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Analysis of a Goldschmied Propulsor Using Computational Fluid Dynamics Referencing California Polytechnic's Goldschmied Propulsor Testing
… by Fabio Goldschmied. The concept combines boundary layer suction and boundary layer ingestion technologies to reduce drag and increase propulsor efficiency. The most recent testing, done in 1982, left questions concerning the validity of the results. To answer these questions a 38.5in …
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Design and development of a continuous, open-return transonic wind tunnel facility
… shock buffet phenomenon and control, shock wave boundary layer ingestion to a propulsor, and other future research topics. The new wind tunnel is a rectangular testing facility with a 6 in (width) x 9 in (height) cross-sectional area in the test section. It is a continuous, open-return facility, …
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Investigation Into Flutter of Complex Vane Packs
… fuel efficient aircraft using concepts such as boundary layer ingestion (BLI) that cause large amounts of pressure and swirl distortion that enter the jet engines. To enable ground testing the performance of these engines in different distortion patterns, the StreamVane and ScreenVane systems …
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