An Approach to Optimum Subsonic Inlet Design

Luidens, R. W.; Stockman, N. O.; Diedrich, J. H.

doi:10.1115/79-gt-51

Cited by 12 publications

(10 citation statements)

References 2 publications

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“…The isoaxial factor could be especially important at flight speeds, because of the tendency for sharp edges to cause flow separation and strong turbulence when the flows are not precisely isoaxial [Luidens et al, 1979]. It is for this reason that virtually all leading edges on aircraft are curved.…”

mentioning

confidence: 99%

Airborne aerosol inlet passing efficiency measurement

Huebert¹,

Lee²,

Warren³

1990

J. Geophys. Res.

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We have evaluated the aerosol passing efficiency of a variety of inlet systems during three experiments on the National Center for Atmospheric Research Electra. During the Dynamics and Chemistry of the Marine Stratocumulus (DYCOMS) program, we found discrepancies between concentrations in cloud water and the air below cloud, which we attribute to curved-inlet aerosol losses. In the First ISCCP Regional Experiment (FIRE) program, the same curved inlet passed significantly less material than a straight one. In the Particulate Matter Airborne Sampling Inlet Experiment (PASIN), we analyzed the material deposited within one inlet tube to establish an efficiency reference. Six different inlets were used simultaneously with six filter samplers to evaluate the effects of tube diameter, radius of curvature, and surface coating. The PASIN filters collected different amounts of material when they should have been sampling the same aerosol. Extraction of the 1-inch metal reference tube routinely found that 50--90% of the aerosol material had been deposited in the tube. None of the inlets had an average bulk efficiency greater than about 50% for the aerosol species we measured. In the commonly used 1-inch ID curved tube inlet, only 10-20% of marine sodium made it to the filter. High turbulence in the diffuser cone may be responsible for much of the observed loss. It is possible that many of the existing aircraftderived aerosol data in the literature are serious underestimates of actual ambient concentrations. We suggest some changes in strategy to improve the collection of aerosols from aircraft.

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mentioning

confidence: 99%

Airborne aerosol inlet passing efficiency measurement

Huebert¹,

Lee²,

Warren³

1990

J. Geophys. Res.

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“…Conventional rigid subsonic inlets can only attain a trade-off concerning minimum drag at high velocities and avoidance of flow separation at low velocities. While the identification of ideal trade-off geometries is subject of numerous studies (Luidens et al, 1979), (Pierluissi et al, 2011), (Schnell and Corroyer, 2015), variable pitot inlets may eliminate the necessity of an aerodynamic trade-off. Hence, subsonic variable inlets have been investigated in different studies.…”

Section: Aircraft Engine Inletsmentioning

confidence: 99%

A Variable Pitot-Inlet Concept for Supersonic Aviation

Kazula¹,

Höschler²

2020

Proceedings of Global Power &Amp; Propulsion Society

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An overview of aero-engine inlets, the design process in aviation and a safe design approach for academic studies is provided. By means of a safe design approach, a variable inlet concept is developed up to technology readiness level (TRL) 3 and described. The application of safety and reliability methods, aerodynamic and structural analyses, as well as functional demonstrators proves the feasibility of the present variable inlet concept and highlights its potential for application in future supersonic transport (SST).

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“…Hence, conventional rigid subsonic inlets can only accomplish a trade-off concerning minimum drag at high velocities and avoidance of flow separation at low velocities. While numerous studies [15], [16], [17] focus on the identification of ideal trade-off geometries, variable pitot inlets could eliminate the necessity for said trade-off.…”

Section: Aero Engine Inlets 21 Tasks and Trade-off In Designmentioning

confidence: 99%

“…3. The geometric parameters, which are utilised to investigate the influence on the inlet evaluation criteria during the optimisation are the inlet length linl, the diffuser length ldif and the lip length llip, as well as the radial lip height hlip, the lip fineness ratio llip/hlip, inlet throat radius rth, and the forebody height hext [15].…”

Section: Approachmentioning

confidence: 99%

Parametric Design Study on Aerodynamic Characteristics of Variable Pitot Inlets for Transonic and Supersonic Civil Aviation

et al. 2019

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This paper reveals the influence of selected geometric parameters on the aerodynamic performance of circular variable aero engine inlets in transonic and supersonic civil aviation. The trade-off in inlet design and aerodynamic evaluation parameters are presented. The approach to investigate the dependencies between the aerodynamic and geometric parameters at different flight conditions by means of a parametric design study is introduced. The dependencies of inlet drag and efficiency from geometric parameters at flight speeds of Mach 0.95 up to Mach 1.6 are identified. Although entailing additional weight, the inlet length represents the parameter with the highest potential for drag reduction by up to 50% in the selected design space. Ideal geometries for variable pitot inlets are determined. After considering weight, their potential range benefit nearly disappears for subsonic applications, but remains above 20% for supersonic flight at Mach 1.6.

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An Approach to Optimum Subsonic Inlet Design

Cited by 12 publications

References 2 publications

Airborne aerosol inlet passing efficiency measurement

Airborne aerosol inlet passing efficiency measurement

A Variable Pitot-Inlet Concept for Supersonic Aviation

Parametric Design Study on Aerodynamic Characteristics of Variable Pitot Inlets for Transonic and Supersonic Civil Aviation

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