Wake ingestion propulsion benefit

Smith, L. H.

doi:10.2514/3.11487

Cited by 264 publications

(190 citation statements)

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“…Some aircraft engine technologies offer small incremental improvements but a few others offer a benefit large enough to be considered compelling for a future commercial aircraft application. One such technology is Boundary Layer Ingestion (BLI) propulsion, which has the potential for significant reduction in aircraft fuel burn 1 that is achieved by ingesting and exhausting airflow at lower mean velocities, thus producing the required aircraft thrust with less propulsive power input or in other words improved propulsive efficiency. Other associated benefits include the elimination of some part of the nacelle and the entire pylon, which results in a decrease in weight and drag.…”

Section: Introductionmentioning

confidence: 99%

Aeromechanics Analysis of a Distortion-Tolerant Fan with Boundary Layer Ingestion

Bakhle

Reddy

Coroneos

et al. 2018

2018 AIAA Aerospace Sciences Meeting

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A propulsion system with Boundary Layer Ingestion (BLI) has the potential to significantly reduce aircraft engine fuel burn. But a critical challenge is to design a fan that can operate continuously with a persistent BLI distortion without aeromechanical failure -flutter or high cycle fatigue due to forced response. High-fidelity computational aeromechanics analysis can be very valuable to support the design of a fan that has satisfactory aeromechanic characteristics and good aerodynamic performance and operability. Detailed aeromechanics analyses together with careful monitoring of the test article is necessary to avoid unexpected problems or failures during testing. In the present work, an aeromechanics analysis based on a three-dimensional, time-accurate, Reynolds-averaged Navier Stokes computational fluid dynamics code is used to study the performance and aeromechanical characteristics of the fan in both circumferentially-uniform and circumferentially-varying distorted flows. Pre-test aeromechanics analyses are used to prepare for the wind tunnel test and comparisons are made with measured blade vibration data after the test. The analysis shows that the fan has low levels of aerodynamic damping at various operating conditions examined. In the test, the fan remained free of flutter except at one near-stall operating condition. Analysis could not be performed at this low mass flow rate operating condition since it fell beyond the limit of numerical stability of the analysis code. The measured resonant forced response at a specific low-response crossing indicated that the analysis under-predicted this response and work is in progress to understand possible sources of differences and to analyze other larger resonant responses. Follow-on work is also planned with a coupled inlet-fan aeromechanics analysis that will more accurately represent the interactions between the fan and BLI distortion.

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Section: Introductionmentioning

confidence: 99%

Aeromechanics Analysis of a Distortion-Tolerant Fan with Boundary Layer Ingestion

Bakhle

Reddy

Coroneos

et al. 2018

2018 AIAA Aerospace Sciences Meeting

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“…To assess the effectivity of boundary layer ingestion a power saving coefficient (PSC) defined with Equation (3) is used. The concept of a PSC was first introduced in [8]. It describes the difference in necessary propulsive power for a propulsor without boundary layer ingestion compared to one with ingestion which provides the same amount of thrust.…”

Section: Boundary Layer Ingestionmentioning

confidence: 99%

Modelling of A Boundary Layer Ingesting Propulsor

Budziszewski

Friedrichs

2018

Energies

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Boundary layer ingestion is a promising method to decrease the propulsive power consumption of an aircraft, and therefore the fuel consumption. This leads to a reduced environmental impact and an improved cost-efficiency. To get a better understanding of this method and to estimate its benefits, the modelling of a propulsor located at the upper rear centerbody of a blended wing body aircraft is presented in this paper. A parallel compressor model approach is used to analyse the impact of the ingested low velocity fluid which leads to a non-uniform inflow. The required boundary layer data are generated with an analysis tool for 2D subsonic airfoils. Some parameter variations are conducted with the developed programme to study their impact on the power saving potential. In addition, a simple estimation for the benefit of embedded aeroengines is given. Despite the drawback from fan efficiency due to the inflow distortion, the results show a significant decrease in required propulsive power for boundary layer ingestion in combination with integrated engines.

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“…The previous analyses, such as that of Smith [17], have typically computed the propulsor power reduction with the assumption that the ingested airframe boundary layer is given. However, computing or estimating the benefit of integrated/ingesting propulsion systems is far more complex, since the airframe flow is itself modified.…”

Section: Evaluation Of Alternative Propulsion Systemsmentioning

confidence: 99%

Power Balance in Aerodynamic Flows

2009

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A control volume analysis of the compressible viscous flow about an aircraft is performed, including integrated propulsors and flow control systems. In contrast to most past analyses which have focused on forces and momentum flow, in particular thrust and drag, the present analysis focuses on mechanical power and kinetic energy flow. The result is a clear identification and quantification of all the power sources, power sinks, and their interactions which are present in any aerodynamic flow. The formulation does not require any separate definitions of thrust and drag, and hence it is especially useful for analysis and optimization of aerodynamic configurations which have tightly integrated propulsion and boundary layer control systems. x, y, z cartesian axes

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Wake ingestion propulsion benefit

Cited by 264 publications

References 1 publication

Aeromechanics Analysis of a Distortion-Tolerant Fan with Boundary Layer Ingestion

Aeromechanics Analysis of a Distortion-Tolerant Fan with Boundary Layer Ingestion

Modelling of A Boundary Layer Ingesting Propulsor

Power Balance in Aerodynamic Flows

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