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Separating-Reattaching Flows Over an Iced Airfoil

Diakon Solutions LLC-Ezgi Oztekin
Federal Aviation Administration (FAA)-James Riley
Published 2019-06-10 by SAE International in United States
Delayed Detached Eddy Simulations (DDES) of separating-reattaching flows on the suction side of an ice-contaminated airfoil were conducted. A single-section straight-wing NACA23012 airfoil with leading-edge ice was studied. The geometry represents a realistic glaze horn-ice contamination obtained during the icing test campaigns described in [1], which has aerodynamic data for comparison. The three-dimensional transient flow behavior was simulated using the open-source flow solver OVERFLOW, version 2.2l [2] developed by NASA Langley Research Center. Configurations at three angles of attack that exhibit unsteady flow behavior starting with the bursting angle were examined at Mach number of 0.18 and Reynolds number of 1.8x106. As the stall angle was approached the aerodynamic performance parameters displayed large-scale unsteadiness where periods of attached and separated flows were observed. The time-averaged results show good agreement with the aerodynamic test data. The calculated Strouhal number for the self-sustained low-frequency oscillations is consistent with the previous experimental research.
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A Penalization Method for 2D Ice Accretion Simulations

Ecole Polytechnique Montreal-Pierre Lavoie, Eric Laurendeau
ONERA-Ghislain Blanchard, Emmanuel Radenac, Philippe Villedieu
Published 2019-06-10 by SAE International in United States
Numerical tools for 3D in-flight icing simulations are not straightforward to automate when seeking robustness and quality of the results. Difficulties arise from the geometry and mesh updates which need to be treated with care to avoid folding of the geometry, negative volumes or poor mesh quality. This paper aims at solving the mesh update issue by avoiding the re-meshing of the iced geometry. An immersed boundary method (here, penalization) is applied to a 2D ice accretion suite for multi-step icing simulations. The suggested approach starts from a standard body-fitted mesh, thus keeping the same solution for the first icing layer. Then, instead of updating the mesh, a penalization method is applied including: the detection of the immersed boundary, the penalization of the volume solvers to impose the boundary condition and the extraction of the surface data from the field solution. Although the current work is intended for 3D simulations, the content of this paper is limited to 2D applications to show the feasibility of the method. Tests are performed on multi-step rime and glaze…
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Generating Electrical Power from Waste Heat

  • Magazine Article
  • TBMG-34611
Published 2019-06-01 by Tech Briefs Media Group in United States

Directly converting electrical power to heat is easy; however, converting heat into electrical power is not as easy. To address this issue, a tiny silicon-based device was developed that can harness what was previously called waste heat and turn it into DC power. The device could be used as a compact infrared power supply that could replace radioisotope thermoelectric generators (RTGs) that are used for such tasks as powering sensors for space missions that don’t get enough direct sunlight to power solar panels. The device is made of common and abundant materials such as aluminum, silicon, and silicon dioxide — or glass — combined in uncommon ways.

 
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Standard for Safety Glazing Materials for Glazing Motor Vehicles and Motor Vehicle Equipment Operating on Land Highways - Safety Standard

Glazing Materials Standards Committee
  • Ground Vehicle Standard
  • J3097Z26_201905
  • Current
Published 2019-05-28 by SAE International in United States

Specifications, test methods, and usage provisions for safety glazing materials used for glazing of motor vehicles and motor vehicle equipment operating on land highways.

 
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Elastomer: Silicone (VMQ) Rubber Sheet, Glass Cloth Reinforced, Heat and Weather Resistant, 60 to 80 Type “A” Durometer Hardness

AMS CE Elastomers Committee
  • Aerospace Material Specification
  • AMS3320J
  • Current
Published 2019-05-10 by SAE International in United States

This specification covers a silicone (VMQ) elastomer, reinforced with glass cloth, in the form of sheet.

 

Ø SIZE CLASSIFICATION AND CHARACTERISTICS OF GLASS BEADS FOR PEENING

Surface Enhancement Committee
  • Ground Vehicle Standard
  • J1173_201905
  • Current
Published 2019-05-03 by SAE International in United States
This specification covers the characteristics of glass beads used for peening, and provides for standard glass bead size numbers.
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Environmental Degradation of Textiles

AGE-2 Air Cargo
  • Aerospace Standard
  • AIR1490C
  • Current
Published 2019-04-24 by SAE International in United States
Since cargo restraint devices made with textiles should have a predictable service life, there should be data available so that predictions can be made. This document compiles available information on textiles of the types used in air cargo restraint devices and reviews the degradation characteristics of each. Textiles are used primarily in cargo restraint nets on air cargo pallets and nonstructural containers, restraint nets installed in cargo aircraft, and similar applications.
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Test Procedure for Determining the Resistance of Safety-Glazing Materials, of which One Surface is Plastic, to Simulated Weathering

Glazing Materials Standards Committee
  • Ground Vehicle Standard
  • J2081_201904
  • Current
Published 2019-04-11 by SAE International in United States
This SAE Recommended Practice determines whether plastic and glass-plastic safety glazing materials will successfully withstand exposure to simulated weathering conditions.
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Plastic Motor Vehicle Safety Glazing - Tolerances and Fabrication Details

Glazing Materials Standards Committee
  • Ground Vehicle Standard
  • J1691_201904
  • Current
Published 2019-04-11 by SAE International in United States
This SAE Recommended Practice is intended to cover plastic safety glazing for use in motor vehicles and motor vehicle equipment. Nominal specifications for thickness, flatness, curvature, size, and fabrication details are presented principally for the guidance of body engineers and designers. For additional information on plastic safety glazing materials for use in motor vehicles and motor vehicle equipment, please refer to SAE J673.
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Developing High Dielectric Strength Alumina for Spark Plugs

Fram Group Company-Jing Zheng, Danny R. Overton, Philip Paul Treier
Published 2019-04-02 by SAE International in United States
Engine downsizing and widely adopted Gasoline Turbo Direct injection (GTDi) technology has led to harsher application condition for spark plugs, which demand insulators with higher dielectric strength to meet the new challenges in modern engine platform. To improve conventional alumina insulators, the influences of material properties, such as porosity, grain size, glass chemistry and surface finish, on dielectric strength performance are studied. It is also found that, the manufacturing process can greatly impact the final performance. Hence, the effort in optimizing process variables will be discussed and the performance of resultant Autolite HD95 ceramic will be reviewed against those of several leading manufacturers.
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