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Monday, July 27, 2020 | History

2 edition of Gain selection method and model for coupled propulsion and airframe systems found in the catalog.

Gain selection method and model for coupled propulsion and airframe systems

Patrick C Murphy

Gain selection method and model for coupled propulsion and airframe systems

by Patrick C Murphy

  • 386 Want to read
  • 25 Currently reading

Published by National Aeronautics and Space Administration, Scientific and Technical Branch, For sale by the National Technical Information Service] in Washington, D.C, [Springfield, Va .
Written in English

    Subjects:
  • Airplanes -- Handling characteristics,
  • Airframes

  • Edition Notes

    StatementPatrick C. Murphy
    SeriesNASA technical paper -- 2067
    ContributionsUnited States. National Aeronautics and Space Administration. Scientific and Technical Information Branch
    The Physical Object
    Pagination30 p. :
    Number of Pages30
    ID Numbers
    Open LibraryOL14933219M

    As described above, with some modifications, this coupled viscous/potential flow method can also used to simulate a self-propulsion test. Table 1 shows the comparison of the computational results and the experimental data of a self-propulsion test. Integration of Propulsion-Airframe- Aeroacoustic Technologies and Design Concepts for a Quiet Blended- Wing-Body Transport G.A. Hill*, S.A. Brown^, and K.A. Geiselhart^ NASA Langley Research Center, Hampton, VA C.M. Burg § Aerospace Systems Design Lab, Georgia Institute of Technology, Atlanta, GA This paper summarizes the results.

    Commercial Aircraft Propulsion and Energy Systems Research develops a national research agenda for reducing CO2 emissions from commercial aviation. This report focuses on propulsion and energy technologies for reducing carbon emissions from large, commercial aircraft— single-aisle and twin-aisle aircraft that carry or more passengers. AMTS Airframe, Volume 2: Systems is the second book of the series, which is divided into 2 volumes. Airframe: Systems covers the various systems involved with the airframe, encompassing electrical, fuel, cabin atmosphere control, instruments, communications and navigation, ice and rain control, and fire protection systems, and aircraft inspections.

    Advanced aircraft concepts are increasingly reliant on closer coupling of propulsion systems with airframe aerodynamics, or propulsion/airframe integration (PAI), for optimal performance. For instance, several advanced concepts employ fuselage boundary layer ingestion by turbofan engines to achieve a reduction in mission fuel burn. Thereafter, the method used for modeling of the FF propulsion system is discussed and a procedure for the matching of CFD results with gas turbine performance calculations is introduced. Description of the CFD setup An essential task associated with a PF concept refers to the aerodynamic assessment of the airframe-propulsion integration.


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Gain selection method and model for coupled propulsion and airframe systems by Patrick C Murphy Download PDF EPUB FB2

Gain Selection Method and Model for Coupled Propulsion and Airframe Systems Patrick C. Murphy Langley Research Center Hampton, Virginia NI A National Aeronautics and Space Administration Scientific and Technical Information Branch. Gain selection method and model for coupled propulsion and airframe systems.

Washington, D.C.: National Aeronautics and Space Administration, Scientific and Technical Branch ; [Springfield, Va.: For sale by the National Technical Information Service], (OCoLC) Material Type: Government publication, National government publication.

Gain selection method and model for coupled propulsion and airframe systems / By Patrick C. Murphy and United States. National Aeronautics and Space Administration.

Scientific and Technical Information Branch. Abstract "October "es bibliographical of access: Internet Topics. Based on the control-oriented model deduced in Sec.the control law for mode transition could be designed with airframe/propulsion couplings considered by trimming the vehicle as the inlet splitter is closing.

The design method chosen in this work is calculating trim points at different stages of mode transition, which means the steady Cited by: 6. A new approach is presented for building coupled aeropropulsive analyses of boundary layer ingestion (BLI) propulsion systems using a 1-D cycle model and a RANS aerodynamic model.

The approach was implemented in the OpenMDAO framework, using pyCycle and ADflow for the propulsion and aerodynamic analyses, by: Propulsion Airframe Integration FY Accomplishments PAIT Inlet Concept Studies (LeRC) Wing/2-D Mixer-Ejector Nozzle Interactions Test (LeRC) SA Model Prep (ARC) Significance • Defined Relative Merits of Candidate Concept • Identified PAl Issues as Critical • No First-Order PAl Effects on Aero Performance Of Nozzle.

Some details about numerical methods employed for the aero-airframe-propulsion experimental work and a brief overview of multi-disciplinary interfacing are presented. Down-selection Framework During the down-selection exercise concept clouds comprising 6 candidate designs for both the PFC and DMFC sets were qualitatively rated.

The current state of the art for high-power, continuous thrust electric propulsion systems yield about ~ mN ( N) of thrust per engine, operating at.

The proposed scheme is universally applicable to coupled airframe–propulsion aircraft concepts, compatible with standard aircraft and propulsion system sizing tools and, under certain assumptions, deployable for low- and high-fidelity evaluation methods, such as semi-empirical methods as well as CFD or physical testing results.

propulsion systems. By entraining the boundary layer developing on wetted surfaces of the airframe into a propulsion system appropriately designed to compensate the airframe momentum deficit through a momentum increment, a reduction in induced over-velocities and hence propulsive power demand can be.

technology, to address future propulsion airframe integration challenges, in a multidisciplinary design environment. CFD Based Design Systems CFD based design systems have been used effectively now for several years.

Essential to a productive design system is an efficient method. The fully coupled aeropropulsive model includes a three-dimensional Reynolds-averaged Navier–Stokes aerodynamic analysis of the flow and a thermodynamic cycle model of the propulsor fan.

Concept selection Numerous methods of non-aerodynamic attitude stabilisation and control have been implemented over the history of spaceflight; Table 1 describes some of the main methods (partially taken from [7]). Other methods that have been used in large-scale vehicles in the past include: jet tabs, the jetavator, fluidic steering and.

Based on consistent book-keeping standards for conventionally installed and highly integrated propulsion systems, key aspects of conceptualisation regarding airframe and propulsion system are. 2. Historical review of distributed propulsion technology A few conceptual milestones of aircraft distributed propulsion.

InManzel (Fig. 1A) proposed multiple propeller units arranged in two rows or series as the propelling mechanism for airships, aircraft and the motivation behind this concept was the feasibility of ascent without a special landing field.

Airframe-propulsion integration design is one of the key techniques of air-breathing hypersonic vehicles [] to reduce overall drag and achieve positive thrust margins at hypersonic speeds [].The engine and airframe aerodynamics therefore become highly coupled [].Airframe-propulsion integration methodologies for the hypersonic vehicle have been extensively studied by many researchers [4, 5, 6, 7].

In order to analyze the basic relations of airframe/propulsion integration within the framework of the supersonic small perturbation theory, viscous tension \({\overrightarrow{\tau}}_W \) can be excluded from consideration, as well as the influence of the vehicle nose and leading edges’ bluntness.

As it is accepted within the theory, the flow disturbances caused by the vehicle airframe are. Airplane - Airplane - Propulsion systems: The engines used to provide thrust may be of several types. Often an internal-combustion piston engine is used, especially for smaller planes.

They are of various types, based on the arrangement of the cylinders. Horizontally opposed engines employ four to six cylinders lying flat and arrayed two or three on each side. Propulsion Airframe Integration Hybrid Electric Propulsion Alternative Fuels Quiet, Simplified High-Lift Research Areas.

High Eff. Small Gas Generator SX/PX Rim F PM Bore F Reduce Drag, Weight, TSEC, Emissions and Noise. coupled propulsion system/airframe components. The approach is to configure the model for tests representing two different test techniques.

One is the conventional test technique, where absolute configuration aerodynamics (including inlet/airframe interactions). Propulsion approaches other than combustion engines have been proposed, notably fuel cells (Stedman, ) and solar power.

Fuel-cell systems have the potential advantage of high energy densities but have relatively low power densities. Turbochargers and heat exchangers similar to those for piston engines would be required at high altitude.5], and between the propulsion, electrical, and thermal management systems [6].

Spatial integration While spatial or geometric integration is important for aircraft design generally, electric.PDF | The aim of this research is the identification of a unified bookkeeping and evaluation scheme for the integrated performance analysis of a | Find, read and cite all the research you need.