Convergent Nozzle Gross Thrust Coefficient and Discharge Coefficient Calculation with Boundary Layer Ingestion (BLI) Effects

Shi, Mingxuan; Pokhrel, Manish; Gladin, Jonathan C.; García, Elena; Mavris, Dimitri N.

doi:10.2514/6.2017-5057

Cited by 4 publications

(3 citation statements)

References 11 publications

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“…To realistically model the performance of a BLI propulsion system, this paper will use the environment in GT-HEAT developed by Shi that incorporates a modified parallel compressor model 12 and nozzle model 13 in the framework setup by Gladin. 14 CFD is used to isolate the effects of the propulsors on the flow field and consequently, the boundary layer that the propulsor ingests.…”

Section: Bli Impacts On Losses In the Propulsormentioning

confidence: 99%

“…The nozzle model built by Shi 13 is used to analyze the impacts of distortion on the discharge coefficient and gross thrust coefficient. The loss model is a combination of an analytic turbulent pipe flow solution and a mixing model that predicts the pressure drop using the generated entropy through the nozzle, as shown in Fig.…”

Section: Distortion Impacts: Nozzlementioning

confidence: 99%

See 1 more Smart Citation

Conceptual Design of a BLI Propulsor Capturing Aero-Propulsive Coupling and Distortion Impacts

Pokhrel

Shi

Ahuja

et al. 2019

AIAA Scitech 2019 Forum

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Boundary Layer Ingestion (BLI) appears to be a promising solution to meet aggressive aviation fuel burn and environmental goals defined by NASA and other entities. Propulsion-airframe integration plays a critical role in BLI vehicle design given the strong coupling between the airframe and the propulsion system. Several studies have focused on flow field impacts on the propulsion system performance, but have ignored the effect of the propulsor on the flow field. Recent studies, however, have focused on both aspects, highlighting the need for capturing this interdisciplinary coupling. Multidisciplinary analyses (MDA), especially those involving CFD, are computationally expensive and are not suitable in the conceptual design of BLI propulsion systems. This paper aims to provide a less expensive approach by developing a parametric formulation for the effect of the propulsion system on the flow field, which can then be used in BLI propulsor conceptual design. This paper quantifies the sensitivity of the changes in the flow field due to the on-design and off-design parameters of the propulsion system. In addition, it also illustrates the difference in propulsion system design and performance when the throttle dependent effects on the flow field is captured, to the case where it is not. Distortion impacts on engine sizing and performance are also considered in this paper.

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Section: Bli Impacts On Losses In the Propulsormentioning

confidence: 99%

Section: Distortion Impacts: Nozzlementioning

confidence: 99%

Conceptual Design of a BLI Propulsor Capturing Aero-Propulsive Coupling and Distortion Impacts

Pokhrel

Shi

Ahuja

et al. 2019

AIAA Scitech 2019 Forum

Self Cite

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“…However, a number of significant challenges -both on modeling and design -appear as a result of BLI. Various studies [1][2][3][4] have been conducted to to capture the impacts of BLI on the the propulsion system, such as those in the inlet, fan, and nozzle. Many BLI propulsor modeling studies use representative fan maps and scale them accordingly.…”

Section: Introductionmentioning

confidence: 99%

Application of Variational Asymptotic Method for Structural Analysis of Fan Rotor Blades in Boundary Layer Ingesting Flow Field

Gupta

Pokhrel

Hodges

et al. 2020

AIAA Scitech 2020 Forum

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Boundary Layer Ingestion (BLI) appears to be a promising technology for reducing aircraft fuel burn. Despite potential benefits, there are several challenges associated with BLI. A primary concern is the structural integrity of the fan blades experiencing unsteady forces due to unequal work input from the rotor at different circumferential locations of the engine annulus. In the conceptual design phase, rapid turnaround is as important as measuring the stresses accurately. Through the present work, the authors present a computationally efficient framework for measuring natural frequencies and analyzing time histories of 3-D stresses in nonlinear transient structural analyses of rotating fan blades. This framework uses state of the art tools developed for beam modeling based on Variational Asymptotic Method and the Geometrically Exact Beam Theory. The authors also provide verification of the present framework against 3-D finite element analysis performed in COMSOL.

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Model Fidelity Requirements in Boundary Layer Ingestion Propulsion System Conceptual Design

Shi

Pokhrel

Gladin

et al. 2018

2018 Aviation Technology, Integration, and Operations Conference

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Convergent Nozzle Gross Thrust Coefficient and Discharge Coefficient Calculation with Boundary Layer Ingestion (BLI) Effects

Cited by 4 publications

References 11 publications

Conceptual Design of a BLI Propulsor Capturing Aero-Propulsive Coupling and Distortion Impacts

Conceptual Design of a BLI Propulsor Capturing Aero-Propulsive Coupling and Distortion Impacts

Application of Variational Asymptotic Method for Structural Analysis of Fan Rotor Blades in Boundary Layer Ingesting Flow Field

Model Fidelity Requirements in Boundary Layer Ingestion Propulsion System Conceptual Design

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