Effects of Boundary Layer Ingesting (BLI) Propulsion Systems on Engine Cycle Selection and HWB Vehicle Sizing

Gladin, Jonathan C.; Sands, Jonathan S.; Kestner, Brian K.; Mavris, Dimitri N.

doi:10.2514/6.2012-837

Cited by 19 publications

(6 citation statements)

References 4 publications

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“…The optimal BLI engine cycle design is dictated by installation-specific behaviors, which must be accurately accounted for. 43 An important observation can be made when comparing the effect of total pressure losses on the fan and core separately. The core behaves much like a turboshaft, adding work to the fan by means of a turbine.…”

Section: A Engine Cycle Effectsmentioning

confidence: 99%

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Progress in Boundary Layer Ingesting Embedded Engine Research

Ferrar¹,

O’Brien²

2012

48th AIAA/ASME/SAE/ASEE Joint Propulsion Conference &Amp;amp; Exhibit

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Modern aviation requirements for energy efficiency and environmental compatibility push air vehicle development toward highly integrated systems in which each component, and the system, is optimized for overall performance. Embedded engines and boundary layer ingesting propulsion systems have the potential to simultaneously improve fuel burn, noise, and emissions. Energizing the boundary layer of a drag-producing object has been recognized as a viable method to effectively reduce drag as part of the propulsion process for many years. For decades, investigators have suggested different methods for energizing boundary layers with propulsion systems. A wealth of publications forms a body of work including mathematical predictions of the effects of boundary layer ingestion and explanations of the physical basis for the process. This paper seeks to present a review of this work, in light of results from current research, to provide a reference and vision for the continuing development of boundary layer ingesting embedded engine technology.

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Section: A Engine Cycle Effectsmentioning

confidence: 99%

“…1 Additional losses within the BLI inlet arise from the complex flow structures discussed above. 37,43 The effects represent an inefficient inlet, with typical face-averaged recoveries of 0.977. By comparison, podded inlets can achieve recoveries on the order of 0.998 or better.…”

Section: A Engine Cycle Effectsmentioning

confidence: 99%

Progress in Boundary Layer Ingesting Embedded Engine Research

Ferrar¹,

O’Brien²

2012

48th AIAA/ASME/SAE/ASEE Joint Propulsion Conference &Amp;amp; Exhibit

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“…A whole system level study of the HWB concept was performed firstly by Gladin et al [54]. Since there were no available data for a HWB aircraft, the authors built a "baseline" HWB aircraft using the Boeing N2A HWB aircraft.…”

Section: N3-x Conceptmentioning

confidence: 99%

Recent Advances in Boundary Layer Ingestion Technology of Evolving Powertrain Systems

2022

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The increasing environmental concern during the last years is driving the research community towards reducing aviation’s environmental impact. Several strict goals set by various aviation organizations shifted the research focus towards more efficient and environmentally friendly aircraft concepts. Boundary Layer Ingestion (BLI) is currently investigated as a potential technology to achieve different design goals such as energy efficiency improvement and noise emission reductions in the next generation of commercial aircraft. The technology principle is to place the propulsive unit within the boundary layer generated by the airframe body. Although several studies showed its theoretical benefits, a multidisciplinary nature is introduced in the design phase. This imposes new challenges on the current design tools. An increasing number of publications are focusing on assessing this technology while taking into account interlinks between different disciplines. The goal of this work is to review the current state-of-the-art of BLI evaluation studies. Particular focus is given to the underlying assumptions of each work, the methodology employed, and the level of fidelity of the tools used. By organizing the available work in a comprehensive manner, the up-to-date results are interpreted. The current trends and trade-offs emerging from studies are presented. Through reviewing the ongoing published work, the next steps for further development of the methods that will assess this technology are derived.

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“…In BLI propulsor modeling, many studies use representative fan maps and scale them accordingly. [11][12][13] Sometimes, a small drop in efficiency is assumed to model BLI losses. 14 Some BLI studies have focused on fan modeling rather and the unsteady response of the fan has been ignored.…”

Section: Introductionmentioning

confidence: 99%

Conceptual aero-structural design of a fan stage under distorted flow

Pokhrel

Sarojini

Mavris

2023

Proceedings of the Institution of Mechanical Engineers, Part G:

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Rotor blades experience unsteady forces and aerodynamic losses when operating in a distorted inflow. The structural analysis of rotors under these conditions, therefore, is of prime importance during the early design phase. This work introduces a computationally efficient design framework that links the aerodynamic design and structural analysis of the rotor. Rotor structural analysis comprises computing dynamic stresses, the excitation frequencies, and resonance margins at various modes of vibration. A design space encapsulating fan stage design variables, aerodynamic performance, and rotor structural constraints is explored and optimized for maximum fan stage efficiency subject to aerodynamic and structural constraints.

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Effects of Boundary Layer Ingesting (BLI) Propulsion Systems on Engine Cycle Selection and HWB Vehicle Sizing

Cited by 19 publications

References 4 publications

Progress in Boundary Layer Ingesting Embedded Engine Research

Progress in Boundary Layer Ingesting Embedded Engine Research

Recent Advances in Boundary Layer Ingestion Technology of Evolving Powertrain Systems

Conceptual aero-structural design of a fan stage under distorted flow

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