Your Selections

Gases
Show Only

Collections

File Formats

Content Types

Dates

Sectors

Topics

Authors

Publishers

Affiliations

Committees

Events

Magazine

 
new

Electrical Characterization of Crystalline UO2, THO2 and U0.71TH0.29O2

Aerospace & Defense Technology: June 2019

  • Magazine Article
  • 19AERP06_08
Published 2019-06-01 by SAE International in United States

Evaluating the suitability of advanced alloys for use in uranium-based neutron detectors.

Tracking and identifying radiation sources in the age of nuclear proliferation and well-resourced non-state actors is a national priority. Current neutron detection methods favor large detector volumes and long data collection times. Additionally, portable neutron detection methods have persistent problems with low signal-to-noise (small pulse height) and require large applied voltages.

Annotation icon
 

Temperature-Controlled Materials

  • Magazine Article
  • TBMG-34440
Published 2019-05-01 by Tech Briefs Media Group in United States

Researchers have designed a temperature-controllable copper-based material for sieving or storing different kinds of gases. The rationale used to design the material could act as a blueprint for developing nano-porous materials with a wide variety of applications, including medical.

 

Cobalt Alloy, Corrosion and Heat Resistant, Hardfacing Rod and Wire 62Co - 27Cr - 2.9Ni - 5.5Mo

AMS F Corrosion Heat Resistant Alloys Committee
  • Aerospace Material Specification
  • AMS5819A
  • Current
Published 2019-04-30 by SAE International in United States
This specification covers a corrosion and heat-resistant cobalt alloy in the form of welding rods or wrought wire.
Datasets icon
Annotation icon
 

R410A Based Automotive Heat Pump System That Hits Cabin Heating Goal Successfully in -30 °C Extreme Ambient

BAIC Motor Corporation, Ltd. New Energy-Kelvin Zhai
BYD Auto Industry Company Limited-Xuefeng Chen
Published 2019-04-02 by SAE International in United States
To meet low ambient challenges on Battery based Electric Vehicles (BEV), it is necessary to employ heat pump systems on the HVAC systems. However, due to the boiling points limitation of the regular refrigerant R134A/R1234YF, even with Vapor Injection cycle (VI) added, due to -26°C Boiling Temperature (BT) limitation, it is still encountering serious challenges to meet -30 °C or lower ambient needs, although VI Heat Pump (VI H/P) may reach COP>=1.7 at ambient -18 °C. An alternative low BT refrigerant, R410A, plus VI participation, the combination provides potentials to operate in extreme low ambient like -30 °C. In order to find out the actual heating performance of R410A+VI, a demonstration fleet of three vehicles had been built up for road tests to compare each other, which consists of a traditional vehicle (ICE gas heating), a BEV with PTC water heating system (R134A) and a BEV with VI heat pump system (R410A). The testing area covers the coldest city in China such as Harbin, (-20°C), Yakeshi (-39 °C), The road tests have exhibited positive results…
Datasets icon
Annotation icon
 

Study on Improvement of NOx Reduction Performance at Low Temperature Using Urea Reforming Technology in Urea SCR System

HKT Corporation-Hiroshi Inoue
Hino Motors Ltd-Yuichi Okada, Hiroshi Hirabayashi, Shinya Sato
Published 2019-04-02 by SAE International in United States
To reduce NOx and PM emissions in exhaust gas, after-treatment systems for low NOx emissions are being developed in combination with improvements of engine combustion. In recent years, the exhaust gas temperature has been dropping because of enhanced low-fuel consumption of the engine. Therefore, it is urgent to develop NOx reduction technologies that work at a low temperature under 200degC. Since NOx is reduced by reacting with ammonia supplied to the SCR catalyst, it is necessary to make the urea solution decompose into ammonia using the heat of the exhaust gas to supply sufficient ammonia to the SCR catalyst. However, both the decomposition reaction and hydrolysis reaction of the urea have insufficient exhaust heat, thus making it difficult for urea to decompose and hydrolyze to ammonia at a low temperature. To solve this problem, it focuses on forcibly decomposing the urea solution without depending on the exhaust gas temperature. We selected a urea reforming method in which the urea is directly heated using the glow plug as the heat source. In this study, we have…
Datasets icon
Annotation icon
 

Heat Transfer Characteristics of Gas Cooler in a CO2 Automobile Heat Pump System

Shanghai Jiao Tong University-Dandong Wang, Jun-ye Shi, Binbin Yu, Jiangping Chen
Published 2019-04-02 by SAE International in United States
An automobile heat pump system with conventional refrigerant (HFC-134a or HFO-1234yf) suffers significantly diminishment of heating capacity and system efficiency as the ambient temperature decreases. Natural refrigerant CO2 (GWP = 1) is considered as a promising alternative to HFC-134a in automobile air conditioning (MAC) applications with environmentally friendly advantage. In addition, CO2 automobile heat pump system is a promising heat pump technology for EVs with great heating advantages in a cold climate. This study aims to investigate the supercritical heat transfer characteristics of a compact micro-channel gas cooler applied in an automobile CO2 heat pump system. A simulation model of automobile gas cooler was developed by using segment-by-segment method, and validated by experimental results from Series Gas cooler (SGC) and One Gas cooler (OGC) CO2 heat pump systems. The error of heating capacity between calculated results and experimental results was less than 7%. Using this model, the air and refrigerant temperature distribution as well as the heat transfer coefficient along the refrigerant flow path under the condition of -20 °C air inlet temperature and 9…
Datasets icon
Annotation icon
 

Numerical Modeling Study of Detailed Gas Diffusivity into Catalyst Washcoat for Lean NOx Catalyst

Honda R&D Co., Ltd.-Osami Yamamoto, Yuichi Matsuo, Shinichi Tosa, Tatsuya Okayama
RES Group Inc-Zhiwei Zhang, John Tolsma
Published 2019-04-02 by SAE International in United States
To evaluate the relationship between the exhaust gas purification performance and the catalyst pore properties related to gas diffusion, an elementary reaction model was combined with gas diffusion into catalyst pores, referred to as the pseudo-2D gas diffusion/reaction model. It was constructed for Pt/Al2O3 + CeO2 catalyst as lean NOx catalyst. The gas diffusion was described as macro pore diffusion between the catalyst particles and meso pore diffusion within the particle. The kinetic model was composed of 26 reactions of NO/CO/O2 chemistry including 17 Pt/Al2O3 catalyst reactions and 9 CeO2 reactions. Arrhenius parameters were optimized using activity measurement results from various catalysts with various pore properties, meso pore volume and diameter, macro pore volume and diameter, particle size, and washcoat thickness. Good agreement was achieved between the measured and calculated values. Moreover, as compared to the performance of other catalysts which was not used for reaction model calibration, the simulated results were in good agreement with this experimental data. Using the calibrated reaction model combined with detailed gas diffusion model, a sensitivity analysis for NOx…
Datasets icon
Annotation icon
 

Designing for Turbine Housing Weight Reduction Using Thermal Fatigue Crack Propagation Prediction Technology

Honda R&D Co., Ltd.-Toshikazu San'o, Mitsumasa Sorazawa, Shoji Takahashi
Published 2019-04-02 by SAE International in United States
Turbine housings in car engine turbochargers, which use costly stainless steel castings, account for nearly 50% of the parts cost of a turbocharger. They are also the component which controls the competitiveness of the turbocharger, in terms of both function and cost. In this research, focusing on thermal fatigue resistance which is one of the main functions demanded of a turbine housing, achieving reduction in wall thickness while securing sufficient thermal fatigue resistance, it is possible to reduce the amount of material used in the turbine housing and aimed for cost reduction. Therefore, we built a method to quantitatively predict, using 3D FEM, the lifespan from the initiation of thermal fatigue cracking to the formation of a penetrating crack which leads to gas leakage. This prediction method uses the Abaqus general-purpose nonlinear analysis software from Dassault Systèmes, and produced a low-cycle fatigue analysis by the direct cyclic algorithm, by identifying the parameters for analysis from the results of RIG tests, which applied hot-cold cycle loads. In addition, we reduced the analysis time by using submodel…
Datasets icon
Annotation icon
 

Optimization of Automotive Exhaust Sampling Parameters for Evaluation of After-Treatment Systems Using FTIR Exhaust Gas Analyzers

Horiba Ltd.-Jorge E. Lamas, Kenji Hara, Yuichi Mori
Published 2019-04-02 by SAE International in United States
Understanding the chemical reactions taking place in the engine and after-treatment systems is indispensable for minimizing harmful emissions in automotive exhaust gas. Real time gas analyzers for engine exhaust play a vital role for developing mathematical models and evaluating new after-treatment technologies. Gas analyzers using Fourier Transform Infrared Spectroscopy (FTIR) offer the advantage of continuous non-destructive simultaneous multicomponent analysis of a single gas stream. The ability of such analyzers to detect concentration fluctuations in the sample gas depends on a balance between its sample gas replacement rate and data sampling frequency. Increasing the sampling frequency is useful for detecting rapid concentration fluctuations, provided that the sample gas replacement rate is fast enough. This is commonly achieved by increasing the sample flow rate. However, such approach could be difficult during catalyst evaluation where the sample flow rate that may be extracted is limited. Recent developments in sample cell geometry and gas sampling method have improved gas replacement rate in HORIBA’s FTIR exhaust gas analyzers, without the need to increase sample flow rate. The response time and…
Datasets icon
Annotation icon
 

Titanium Alloy, Forgings 10V - 2Fe - 3Al Consumable Electrode Melted, Single-Step Solution Heat Treated and Overaged 160 ksi (1103 MPa) Tensile Strength

AMS G Titanium and Refractory Metals Committee
  • Aerospace Material Specification
  • AMS4986F
  • Current
Published 2019-04-02 by SAE International in United States
This specification covers a titanium alloy in the form of forgings 4.0 inches (101.6 mm) and under in nominal cross-sectional thickness and of forging stock.
Datasets icon
Annotation icon