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Injury Reduction in Vehicle to Pedestrian Collision using Deployable Pedestrian Protection System in Vehicles

International Centre for Automotive Technology-Jitendra Singh Gaur
  • Technical Paper
  • 2019-28-2551
To be published on 2019-11-21 by SAE International in United States
Head injuries are the main source of road fatalities in when a pedestrian is involved in an accident with the vehicle. The frontal part of vehicle such as engine hood, lower-windshield area and A-pillars are the possible location of head impact in such accidents. The head impact with hard points located in these areas result in the fatal head injuries. The effect of impact can be reduced by using the deployable pedestrian protection systems (DPPS) such as hood-lifters and windshield airbag in the vehicle. The study shows how these systems are effective in reducing the fatalities in pedestrian accidents and how to evaluate the performance of these deployable systems.
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Study on effect of HVAC Air Flow Distribution on Windows Fogging

Hyundai Motor India Engineering-Santhosha Vigneshwaran, Eeshan Geel, G Sundrasekaran
  • Technical Paper
  • 2019-28-2414
To be published on 2019-11-21 by SAE International in United States
Windshield & Windows fogging up in cars has long been a topic of interest & concern. Lot of research has already been put into Front/Rear windshield fogging up issue and, Defrosters, Heated Windshields have been designed to remove the fog effectively. However, Windows Fogging up is still one of the major concerns faced while driving, as it obscures the drivers' field of vision and raises safety concerns. Windows fogging up is a phenomenon in which Moisture is condensed on the glass of the window. It is classified into two categories - Inside Fogging and Outside Fogging. When Ambient temperature is lower than the cabin temperature, the moisture is condensed on the inside surface of the glass. In this case the moisture is added inside the cabin by the occupants when they exhale air. Similarly when the Cabin temperature is lower than the ambient temperature, the moisture from atmosphere is condensed on the outer surface of the glass. A Survey with 500 Indian Customers has been conducted to understand the occurrence of Windows fog up issue…
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Windshield Defrosting Analysis: A Numerical and Experimental Approach

Maruti Suzuki India Ltd.-Chandan Kumar, Mohan Makana, Felix Regin, Amit Garg, Durga Prasad Pedamallu
  • Technical Paper
  • 2019-28-0115
Published 2019-10-11 by SAE International in United States
The outside visibility through the windshield and ORVM visibility through the side glasses are critical for safe driving. The frost deposition on the Windshield and side glasses in the cold climatic condition impairs the outside and ORVM visibility during driving and hence leads to an unsafe driving condition. In India, the regulation AIS-084 governs the defrosting standard. The defrosting performance evaluation by testing cannot be performed at concept stage when the vehicle prototype is not available. It also increases the cost of vehicle development due to increase in the number of prototype used for testing.This paper explains about the in-house developed CFD methodology to evaluate the windshield defrosting performance of the vehicle in the concept stage when no vehicle proto is available and cost of countermeasure for defrosting performance improvent is very less. This methodology is implemented for some of the existing models. The results of CFD simulations are compared to the experimental data using a correlation study and the correlation coefficient of numerical and experimental measurements were reported. CFD simulation was in good agreement…
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EDITORIAL: Losing the plot of the Engineering story?

Automotive Engineering: October 2019

Editorial Director-Bill Visnic
  • Magazine Article
  • 19AUTP10_05
Published 2019-10-01 by SAE International in United States

I think we all will agree that passenger vehicles are “technical” consumer products.

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Passenger Vehicle Windshield Demisting and Defrosting Systems

Interior Climate Control Vehicle OEM Committee
  • Ground Vehicle Standard
  • J902_201909
  • Current
Published 2019-09-25 by SAE International in United States

This SAE Recommend Practice establishes for passenger cars, light trucks, and multipurpose vehicles with GVW of 4500 kg (10000 pounds) or less, as defined by EPA, and M1 category vehicles as defined by the European Commission:

Tuning Material Color and Thermal Properties Separately

  • Magazine Article
  • TBMG-34898
Published 2019-08-01 by Tech Briefs Media Group in United States

The color of a material can often tell how it handles heat. With clothing, for example, the darker the pigment, the warmer you're likely to feel on a hot day. Likewise, the more transparent a glass window, the more heat it can let through. A material's responses to visible and infrared radiation are often naturally linked.

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A Three-Layer Thermodynamic Model for Ice Crystal Accretion on Warm Surfaces: EMM-C

Rolls-Royce Plc-Geoffrey Jones, Benjamin Collier
University of Oxford-Alexander Bucknell, Matthew McGilvray, David Gillespie
Published 2019-06-10 by SAE International in United States
Ingestion of high altitude atmospheric ice particles can be hazardous to gas turbine engines in flight. Ice accretion may occur in the core compression system, leading to blockage of the core gas path, blade damage and/or flameout. Numerous engine powerloss events since 1990 have been attributed to this mechanism. An expansion in engine certification requirements to incorporate ice crystal conditions has spurred efforts to develop analytical models for phenomenon, as a method of demonstrating safe operation. A necessary component of a complete analytical icing model is a thermodynamic accretion model. Continuity and energy balances are performed using the local flow conditions and the mass fluxes of ice and water that are incident on a surface to predict the accretion growth rate. In this paper, a new thermodynamic model for ice crystal accretion is developed through adaptation of the Extended Messinger Model (EMM) from supercooled water conditions to mixed phase conditions (ice crystal and supercooled water). A novel three-layer accretion structure is proposed and the underlying equations described. The EMM improves upon the original model for…
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Simulations of Thin Film Dynamics on a Flat Plate and an Airfoil

Baylor University-Jordan Sakakeeny, Stephen T. McClain, Yue Ling
Published 2019-06-10 by SAE International in United States
The goal of the present study is to investigate the dynamics of a thin water film on a flat plate and an airfoil using direct numerical simulation (DNS). The first case for a wetted flat plate is used to model former experiments and investigate the dynamics of a wind-driven water film. The second case for a thin film on a NACA 0012 airfoil of chord length 0.5 m is used to investigate the dynamics of a wind-driven water film on a curved surface. Particular attention is paid to the interaction between the liquid film and the air shear-layer above the film. As the incoming airflow moves over the thin water film, instability is triggered at the gas-liquid interface. Interfacial waves develop and are advected downstream. The interaction between the air flow and the interfacial waves induces shedding vortices near the interface, which in turn perturb the liquid film farther downstream. Simulations are performed using the open source multiphase flow solvers, Gerris and Basilisk. Both solvers employ a finite-volume approach and the interface is captured using…
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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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Numerical Simulation of Aircraft and Variable-Pitch Propeller Icing with Explicit Coupling

ANSYS Inc.-Isik Ozcer, Guido S. Baruzzi, Miraj Desai, Maged Yassin
Published 2019-06-10 by SAE International in United States
A 3D CFD methodology is presented to simulate ice build-up on propeller blades exposed to known icing conditions in flight, with automatic blade pitch variation at constant RPM to maintain the desired thrust. One blade of a six-blade propeller and a 70-passenger twin-engine turboprop are analyzed as stand-alone components in a multi-shot quasi-steady icing simulation. The thrust that must be generated by the propellers is obtained from the drag computed on the aircraft. The flight conditions are typical for a 70-passenger twin-engine turboprop in a holding pattern in Appendix C icing conditions: 190 kts at an altitude of 6,000 ft. The rotation rate remains constant at 850 rpm, a typical operating condition for this flight envelope. Two icing conditions are simulated: air static temperature -23 °C, LWC 0.2 g/m3 and MVD 20 microns resulting in rime ice, and air static temperature -16 °C, LWC 0.3 g/m3 and MVD 20 microns resulting in mixed ice with rime to glaze transition in the radial direction. The ice shapes in both conditions are assumed to remain intact and…
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