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Thursday, April 16, 2020 | History

2 edition of Rotor design optimization using a free wake analysis found in the catalog.

Rotor design optimization using a free wake analysis

Rotor design optimization using a free wake analysis

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  • 14 Currently reading

Published by NASA Ames Research Center, National Technical Information Service, distributor in [Moffett Field, Calif.], [Springfield, Va.? .
Written in English

    Subjects:
  • Rotors (Helicopters),
  • Wakes (Aerodynamics)

  • Edition Notes

    StatementTodd R. Quackenbush ... [et al.].
    SeriesNASA-CR -- 177612., NASA contractor report -- NASA CR-177612.
    ContributionsQuackenbush, Todd R., Ames Research Center.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL14692824M

    title = "Design optimization of axially laminated rotors for synchronous reluctance motors", abstract = "This article describes a design optimization of an axially laminated rotor of the synchronous reluctance motor, using the optimization method combined with the Author: Shinji Wakao, Y. Nishimura, H. Ando, T. Onuki. Wind tunnel test case: DUT rotor, TSR=6, velocity time traces in the wake, at x/R= downstream the rotor and at radial positions (a) y/R=, (b) y/R= Fast pitch steps and yaw misalignment can cause significant overshoots, that play an important role in the estimation of the fatigue loading lifetime of the rotor. ansys software to perform static analysis to analyse the strength of rotor hub and optimise by using different materials. Keywords- Rotor Hub, Von Mises Stresses, Unigraphics, Aerodynamic Forces I. INTRODUCTION Helicopters are made in many sizes and shapes, but most share the similar major components. These. Rotor and Propeller Analysis Tools: Download Excel File Here I have created a spreadsheet that contains a blade element momentum analysis that can be used for any propeller or rotor. It includes Prandtl tip and root losses, and can be customized with any blade geometry. User can choose from the following inputs: Linear or Optimized twist.


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Rotor design optimization using a free wake analysis Download PDF EPUB FB2

Get this from a library. Rotor design optimization using a free wake analysis. [Todd R Quackenbush; Ames Research Center.;]. N and P. G, "Design and Analysis of Disc Brake Rotor for a Two wheeler," International Journal of Mechanical and Industrial Technology, vol.

1, no. 1, pp.Jan Design Optimization of Small Rotors in Quad-Rotor Configuration have developed a rotor design Rotor design optimization using a free wake analysis book analysis code, HELICE, which exploits analytic simplications possible with.

Aerodynamic Analysis and Optimization of Multi-Rotor Wind Turbines Aaron Rosenberg1, Anupam Sharma1, Department of Aerospace Engineering, Iowa State University, Ames, IA,USA Abstract This paper extends the prescribed wake vortex lattice/line method (VLM) to perform aerodynamic analysis and optimization of dual-rotor wind tur-bines (DRWTs).File Size: 2MB.

tunnel model of a utility rotor blade. The hover analysis is performed using nonuniform inflow without a wake model. The forward flight analysis is performed with and without wake models. Introduction Over the last two decades, work has been done in developing and applying techniques for the optimum design of aircraft structures (refs.

1 and 2).File Size: 1MB. The rotor is designed assuming constant induction for most of the blade span, but near the tip region, a constant load is assumed instead. The rotor design is obtained using an actuator disc model, and is subsequently verified using both a free‐wake lifting line method and a full three‐dimensional Navier–Stokes by: The rotor wake model is based on the proposition that the free wake hover problem possesses a self-preserving state solution when viewed in a rotating frame that is fixed to fundamental idea in the model is that at each point on the rotor wake, when viewed in coordinates rotating with the blade, the velocity contributions due to all effects must be such that there is Cited by: 8.

WAKE COUPLING TO FULL POTENTIAL ROTOR ANALYSIS CODE Francisco J. Torres, I-Chung Chang NASA Ames Research Center, Moffett Field, California Byung K. Oh Boeing Computer Services - Helicopters Support, Philadelphia, Pennsylvania SUMMARY The wake information from a helicopter forward flight code is coupled with two transonic potential rotor.

The numerical wake instability, the most critical problem for analysis, is resolved by adopting slow start-up and by including viscous effects. Also, the instability due to wake interference in tandem rotor analysis is resolved by configuring the initial shapes of the multi-rotor wake as that of a single rotor wake trajectory.

Computational Fluid Mechanics Expertise in wide range of CFD applications; Subsonic - General purpose aircraft/Unmanned Air Vehicles Transonic – Rotorcraft Applications Supersonic/Hypersonic – Fighter Jets/Rockets/Reentry vehicles A family of solutions are present using in-house developed software or enhanced open source software capabilities for complex.

The wake-momentum analysis 5 The wake geometry 7 The performance calculation 11 3 COMPARISON BETWEEN THEORY AND EXPERIMENT 16 Two bladed model rotor 17 Wessex main and tail rotors 18 Sea King main and tail rotors 2 1 Sikorsky S main rotor 22 4 HOVER PERFORMANCE USING ONLY THE WAKE INDUCED VELOCITY.

Suggested Citation:"Experimental and CFD Analysis for Rotor-Stator Interaction of a Waterjet Pump." National Research Council. Twenty-Fourth Symposium on Naval Hydrodynamics.

Washington, DC: The National Academies Press. doi: / ×. A review of the aerodynamics, design and analysis, and optimization of wind turbines, combined with the author’s unique software. Aerodynamics of Wind Turbines is a comprehensive introduction to the aerodynamics, scaled design and analysis, and optimization of horizontal-axis wind author –a noted expert on the topic – reviews the fundamentals and basic Author: Sven Schmitz.

Additionally, this investigation uses finite element methods to design and optimize a mountain bike disc brake rotor using topology optimization. More specifically, the goal is to design a lighter rotor that maintains similar structural performance as rotors that are currently commercially by: 2.

A major source of contra-rotating open rotor (CROR) tonal noise is caused by the interaction of the front-rotor (FR) wakes with the aft-rotor blades. Inspired by chevron nozzles, which increase the mixing process in jet shear layers, serrations are implemented at the FR trailing-edge in order to increase the wake mixing and thus reduce the by: 7.

• Recap: the rotor design problem • Recap: SWP rotor optimization process • Application of MDO: Analysis of a design space by comparison of different technology (Pareto) fronts for changing system constraints • Example: NREL 5MW rotor design problem • Technical challenges of industrial MDO application • Conclusions.

In rotor wake analysis the rotor tip vortices are typically tracked for their position, size and strength. In wind tunnel experiments, PIV measurements allow a vortex core to be captured at an instance in time on a plane. An example of such a measurement can be found in Ref. 6, where rotor wake behavior over the outer 50% of the rotor.

In order to enhance the efficiency of the Savonius rotor, this paper designs a new type of Savonius rotor with a rectifier. By using Computational Fluid Dynamics software to simulate and optimize the various parameters which affect the efficiency of the rotor.

The sliding mesh method is applied here. The Cp-λ curves of wind turbine with different structural Cited by: 1. @article{osti_, title = {Optimization of Darrieus turbines with an upwind and downwind momentum model}, author = {Loth, J L and McCoy, H}, abstractNote = {A theoretical inviscid aerodynamic optimization method for straight-bladed Darrieus wind turbines is presented.

First, a generalized Betz limit has been derived for an arbitrary number of actuator disks in series. Abstract. Aerodynamic shape optimization of a helicopter rotor in hover is presented, using compressible CFD as the aerodynamic model.

An efficient domain element shape parameterization method is used as the surface control and deformation method, and is linked to a radial basis function global interpolation, to provide direct transfer of domain Cited by: wake-CFD solver for calculating the inviscid transonic flow on a two-bladed rotor in hover flight.

In this method, the CFD flow solver is coupled with a free wake model by using the surface transpiration approach, i.e., effects of rotor vortex-wake Cited by: 1. The goal of this book is to gather in a single document the most relevant concepts related to modern optimization methods, showing how such concepts and methods can be addressed using the open source, multi-platform R by: A detailed numerical analysis of secondary flows in a transonic turbine is presented in this paper.

The turbine stage is optimized by mitigating secondary flow through the method of non-axisymmetric endwall design. An automated optimization platform of NUMECA/Design3D was coupled with Euranus as a flow solver for the numerical investigation.

The contoured endwalls Cited by: 1. HAWT blade design, and blade loads. The review provides a complete picture of wind turbine blade design and shows the dominance of modern turbines almost exclusive use of horizontal axis rotors.

The aerodynamic design principles for a modern wind turbine blade are detailed, including blade plan shape/quantity, aerofoil selection and optimal attackFile Size: 1MB. This report covers the design, analysis, manufacturing, and testing of an autonomous quad-rotor helicopter.

A control system was designed and implemented through the use of an onboard microprocessor and inertial measurement system. The goal of the helicopter was to maintain a hover at a used-defined altitude while minimizing lateral drift.

moved radially out from the rotor as they approached the ground and there was an area of dead air, or even up wash, near the root.

Fradenburgh subsequently observed (Ref. 9) that for a rotor with -8° twist and a rotor with °, the more highly twisted rotor performed better out of ground effect but worse in ground by: 5. A two-level parallel strategy for rotorcraft optimization and design.

Authors; Authors and affiliations Our work has addressed issues related to the performance and scalability of parallel computers with respect to the rotor design process. and T. Quakenbush, A New Methodology for Helicopter Free Wake Analysis, in 39th Annual Forum of Author: Joseph W. Manke, Thomas M.

Wicks, Leo Dadone, Joel E. Hirsh, Byung Oh. Rotor design The outer rotor and inner rotor back iron thickness are implanted on the basic principle and operating flux density.

The ideal back iron thickness range of value in outer rotor can be obtain if some conditions are taken into consideration during the machine design such as, the air-gap inter-polar is getting larger, theFile Size: KB. The Third Revised And Enlarged Edition Of The Book Presents An In-Depth Study Of The Dynamic Behaviour Of Rotating And Reciprocating Machinery.

It Evolved Out Of Lectures Delivered At Different Universities Over The Last Two Decades. The Book Deals With Torsional And Bending Vibrations Of Rotors, Stability Aspects, Balancing And Condition Monitoring/5(6). Rotordynamics, also known as rotor dynamics, is a specialized branch of applied mechanics concerned with the behavior and diagnosis of rotating structures.

It is commonly used to analyze the behavior of structures ranging from jet engines and steam turbines to auto engines and computer disk its most basic level, rotor dynamics is concerned with one or more.

A time-spectral and adjoint-based optimization procedure that is particularly e cient for the analysis and shape design of helicopter rotors is developed.

The time-spectral method is a fast and accurate algorithm to simulate periodic, unsteady ows by transform-ing them to a steady-state analysis using a Fourier spectral derivative temporal. Enhancement of Free Vortex Filament Method for Aerodynamic Loads on Rotor Blades conditions and its relation to rotor structural dynamics is one of the most important challenges in wind turbine rotor blade design.

Because of the unsteady flow field around wind turbine blades, prediction of aerodynamic loads with high level of accuracy is Cited by: 2. loadings, the shrouded rotor sees a compound benefit of thrust improvement and power reduction at a given RPM.

Nevertheless at design unshrouded rotor thrusts of 20 g, there is at least a % improvement in thrust. Figure 8 shows a comparison of power versus thrust for the ”, ” and ” shrouded rotor systems. It can be seen that. : Modal Analysis of Rotor Dynamic System using Time Domain Averaging: Concepts and Application in Crack Study (): Zhi Chao Ong: Books.

A final element of a helicopter rotor that needs to be examined is the wake it creates as it travels with a forward velocity. In the simplest case, where no vorticity is shed along the blade span, vortices would only be shed at the blade tips and roots.

The unstructured wake grid uses solution-adaption to improve the resolution of the vortical wake system. Various "error" indicators are used to determine where to refine and coarsen the grid for the rotor wake. Accomplishment Description.

The hybrid structure-unstructured flow solver has been implemented for a hovering rotor problem. Sadler, S. G.: Development and Application of a Method for Predicting Rotor Free Wake Posi-tions and Resulting Rotor Blade Air Loads. NASA CRNASA CRDec.

Sangha, K. B.: Bearingless Rotors and Higher Harmonic Control Modeling Using RACAP. American Helicopter Society 44th Annual Forum, Washington, D.C., June File Size: KB. @article{osti_, title = {Design optimization of small wind turbines for low wind regimes}, author = {Cromack, D E and Oscar, D}, abstractNote = {The optimized design of a wind turbine depends on numerous parameters involving the entire machine (rotor, generator, etc.) and on the intended operating environment as described by the wind characteristics as well as on the.

This paper describes an initial effort to mitigate the computational time when using surrogate optimization with viscous-inviscid interaction (VII) tool for wind-turbine rotor design. The aerodynamic tool used in the present work is the three-dimensional (3D) Method for Interactive Rotor Aerodynamic by: Complete design optimization was not performed, the objective was to demonstrate that design improvements over the baseline geometry could be achieved using numerical optimization.

For these design results to be meaningful, experienced design engineers would need to formulate the optimization problem. The aerodynamic performance and wake dynamics of a Darrieus‐type vertical‐axis wind turbine consisting of two straight blades is simulated using Brown's Vorticity Transport Model.

The predicted variation with azimuth of the normal and tangential force on the turbine blades compares well with experimental measurements.of the transverse-laminated type. Rotor design has been made for two different rotor geometries based on general design recommendations.

These geometries are studied and compared by using 2D finite element analysis. The geometries are developed by optimization algorithms after that. Optimized design is used for fabrication of synchronous.Rotor design has long been pursued using various techniques, but to our knowledge, only several pub-lications have addressed adjoint-based shape design using the non-inertial governing flow equations.

Lee and Kwon [12] presented a continuous adjoint formulation for inviscid, hovering rotor flows on unstructured meshes.