Assessment of the accuracy of gust response calculations by comparison with experiments

Mitchell, Cgb

doi:10.2514/3.44133

Cited by 11 publications

(3 citation statements)

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“…Item 12 should be used when only a minimum amount of Information is needed to make an advance and outlay information contained In item 11 can be obtained In a-tlmely-manner-from-otlier-reportfc 11 The purpose of the vertical columns (a), (b), and (c) is to provide space for separate cost breakdowns when a project has been planned and budgeted by program, function, or…”

Section: Itemmentioning

confidence: 99%

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Enabling Technologies for Nano Air Vehicles

Jacob¹

2009

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This project investigated several areas with the aim of improving performance and operational use of nano air vehicles (NAVs) by understanding fundamental operating principles and developing key technologies. The project developed plasma actuators for thrust and maneuvering control and examined flapping flight through the development of a high speed videogrammetry system and a gust/shear tunnel to replicate flow fields seen as the NAV scale. In the first portion of the research effort, we developed plasma actuators for use as control surfaces, stall mitigation devices and propulsive units for NAVs. Both of these concepts leverage the relevant low speed flow physics experienced at the NAV scale. A secondary objective of this project was to investigate the physics of low speed flow over various biologically inspired aerodynamic configurations, from both numerical and experimental perspectives, and use this information to develop novel yet practical concepts for NAVs. The primary focal points of biological inspiration for this project were the exploration of low speed aerodynamics -particularly separation phenomena -and the physical mechanisms used by nature to optimize performance in this flight regime, including the use of novel plasma actuators, aeroelastic behavior and its effect on gust response and alleviation, and the impact of unsteady motions (flapping) on the flow, especially for the reduction of drag and separation. This was related to the primary objectives of the proposal since plasma actuators are particularly useful as laminar separation control devices.This report is divided into 3 parts. Parts la and lb detail the investigations of jet vectoring plasma actuators and plasma micro-thrusters. Part II discusses flapping wing aerodynamics using high speed videogrammetry. Finally, Part III details the development of the gust/shear tunnel. 0348-0004

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Section: Itemmentioning

confidence: 99%

“…11 The tunnel consists of a bank of miniature computer cooling fans assembled in a 10x11 grid. The fans are controlled by a DC voltage input and are set up for multiple rows to be controlled by a single voltage input.…”

Section: Wind Tunnel Testingmentioning

confidence: 99%

Enabling Technologies for Nano Air Vehicles

Jacob¹

2009

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“…Mitchell 19 employed a technique in which the model was moved in relation to the flow, passing orthogonally through an open jet wind tunnel. Gillman and Bennett 2 0 studied gusts produced by a set of airfoils mounted in a biplane arrangement on the opposite walls of a wind tunnel.…”

Section: Introductionmentioning

confidence: 99%