Assessment of the In-House Laboratory Independent Research at the Army's Research, Development, and Engineering Centers (2020) / Chapter Skim
Currently Skimming:
7 Mechanical Sciences
7 Mechanical Sciences
Pages 78-86
The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.
From page 78... ...
AMRDEC's internal effort to study the mechanisms behind the vorticity flux when vorticity is shed off a lifting surface was described in this project's presentation. Prior research effort showed that reducing the leading edge pressure gradient by using a variable drop leading edge preserves lift and mitigates negative pitch, thereby maintaining lifting surface performance.
|
From page 79... ...
The research addresses some basic questions and is, essentially, a study comparing an inviscid lift model with an unstated drag model, with data from rather crude experiments. The presentation shown during the review addressed an elegant fundamental problem of hover rotor performance, the understanding of which may have been lost in time.
|
From page 80... ...
Why was it useful to measure the vortex near the surface of the wing? Project: Investigation of Corotating and Counterrotating Coaxial Rotor Performance The presentation outlined a short numerical study (using the Rotorcraft Comprehensive Analysis System [RCAS]
|
From page 81... ...
Additionally, the work could be further expanded to include the forward flight impact on performance and, if possible, vibratory hub moment. Project: Time Resolved Boundary Layer State and Surface Streamline Measurements of Rotating Aerodynamic Surfaces via Infrared Thermography The aim of the project is to visualize laminar-to-turbulent transitions on a rotor blade both in hover and in forward flight.
|
From page 82... ...
Project: Development of a Hub-Based Camera System to Observe and Measure Rotorcraft Blade Deformation Motivated by the need to obtain independent high-resolution blade deformation data to address persistent discrepancies between flight test data and aeromechanics computations, this project aims to develop a hub-based camera system to measure blade deformation through the use of off-the-shelf cameras and algorithms for image processing. The project takes advantage of off-the-shelf components and algorithms for the image processing in the rotating system.
|
From page 83... ...
There are several commercial vendors that offer standalone mesh generation software or as part of a general CFD package. AMRDEC's internal effort for development of strand mesh generation software was presented.
|
From page 84... ...
They also need to demonstrate the advantages of the strand mesh generation technology compared to other mesh generation software, including those offered by commercial vendors. Project: Development of Three-Dimensional Fluidic Oscillators for Active Flow Control This project intends to develop and test 3D fluidic oscillators; the two-dimensional versions have already been in use for a long time.
|
From page 85... ...
This project aims to investigate the effects of residual compressive stress in gear fatigue life. It has set forward the hypothesis that the compressive residual stresses from shot peening will not relax after cyclic bending fatigue at normal operating conditions (defined in terms of temperature range, load cycles, and other factors)
|
From page 86... ...
The projects Development of Tomographic PIV Technique for Rotor Applications and Investigation of the Relaxation of Residual Stresses in R otorcraft Gears fell into this category. The impact of the research was not often explicitly stated during the review.
|
Key Terms
This material may be derived from roughly machine-read images, and so is provided only to facilitate research.
More
information on Chapter Skim is available.