Elastomeric Seals for the Army's Lance Missile

1966 ◽  
Vol 39 (4) ◽  
pp. 1233-1246
Author(s):  
S. P. McManus ◽  
S. Pikkn
Keyword(s):  
High Temperature ◽  
Exposure Time ◽  
Chemical Industry ◽  
High Performance ◽  
Propulsion System ◽  
Elastomeric Seals ◽  
Chlorobutyl Rubber ◽  
High Temperature Operation

Abstract The LANCE propulsion system requires dynamic and static seals which must operate under extremely severe conditions for short periods. By analysis and tests it has been found that resin-cured chlorobutyl rubber meets the requirements for low and high temperature operation and retains its properties when exposed to the LANCE propellants for short periods. The chlorobutyl rubber, however, is not a panacea. Its properties become increasingly poorer as exposure time increases. Since the need for high performance, versatile systems should continue indefinitely, it is hoped that research can produce elastomers to meet the growing need for unusual environments such as are described here. For successful accomplishment of this task, the rubber and chemical industry will have to meet the challenge to reach this goal.

On the Integration of Hot Foil Bearings Into Gas Turbine Engines: Theoretical Treatment

2019 ◽  
Author(s):  
Hooshang Heshmat ◽  
James F. Walton
Keyword(s):  
High Temperature ◽  
System Dynamics ◽  
High Performance ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Structural Stiffness ◽  
Foil Bearings ◽  
Foil Bearing ◽  
High Temperature Operation ◽  
Bearing System

Abstract To achieve high power density Gas Turbine Engines (GTEs), R&D efforts have strived to develop machines that spin faster and run hotter. One method to achieve that goal is to use high temperature capable foil bearings. In order to successfully integrate these advanced foil bearings into GTE systems, a theoretical understanding of both bearing and rotor system integration is essential. Without a fundamental understanding and sound theoretical modeling of the foil bearing coupled with the rotating system such an approach would prove application efforts fruitless. It is hoped that the information provided in this paper will open up opportunistic doors to designs presently thought to be impossible. In this paper an attempt is made to describe how an advanced foil bearing is modeled for extreme high temperature operation in high performance turbomachinery including GTEs, Supercritical CO2 turbine generators and others. The authors present the advances in foil bearing capabilities that were crucial to achieving high temperature operation. Achieving high performance in a compliant foil bearing under the wide extremes of operating temperatures, pressures and speeds, requires a bearing system design approach that accounts for the highly interrelated compliant surface foil bearing elements such as: the structural stiffness and frictional characteristics of the underlying compliant support structure across the operating temperature and pressure spectrum; and the coupled interaction of the structural elements with the hydrodynamic pressure generation. This coupled elasto-hydrodynamic-Finite Element highly non-linear iterative methodology will be used by the authors to present a series of foil bearing design evaluations analyzing and modeling the foil bearing under extreme conditions. The complexity of the problem of achieving foil bearing system operation beyond 870°C (1600°F) requires as a prerequisite the attention to the tribological details of the foil bearing. For example, it is necessary to establish how both the frictional and viscous damping coefficient elements as well as the structural and hydrodynamic stiffness are to be combined. By combining these characteristics the influence of frictional coefficients of the elastic and an-elastic materials on bearing structural stiffness and hence the bearing effective coupled elasto-hydrodynamic stiffness coefficients will be shown. Given that the bearing dynamic parameters — stiffness and damping coefficients — play a major role in the control of system dynamics, the design approach to successfully integrate compliant foil bearings into complex rotating machinery systems operating in extreme environments is explored by investigating the effects of these types of conditions on rotor-bearing system dynamics. The proposed rotor/bearing model is presented to describe how system dynamics and bearing structural properties and operating characteristics are inextricably linked together in a manner that results in a series separate but intertwined iterative solutions. Finally, the advanced foil bearing modeling and formulation in connection with resulting rotor dynamics of the system will be carried out for an experimental GTE simulator test rig. The analytical results will be compared with the experiments as presented previously to demonstrate the effectiveness of the developed method in a real world application [1].

190 °C High-Temperature Operation of 905-nm VCSELs With High Performance

2021 ◽  
pp. 1-6
Author(s):  
Meng Xun ◽  
Guanzhong Pan ◽  
Zhuang Zhuang Zhao ◽  
Yun Sun ◽  
Jingtao Zhou ◽  
...  
Keyword(s):  
High Temperature ◽  
High Performance ◽  
High Temperature Operation

An Ultra-Low Noise Instrumentation Amplifer Designed for High Temperature Applications

2012 ◽  
Vol 2012 (HITEC) ◽  
pp. 000082-000086
Author(s):  
Jeff Watson ◽  
Gustavo Castro
Keyword(s):  
High Temperature ◽  
High Performance ◽  
Low Noise ◽  
Silicon On Insulator ◽  
Instrumentation Amplifier ◽  
Leakage Currents ◽  
Comprehensive Reliability ◽  
High Temperature Operation ◽  
Temperature Applications

This paper discusses a very low noise instrumentation amplifier designed specifically for high temperature applications. The device uses a proprietary silicon-on-insulator process that minimizes parasitic leakage currents at elevated temperature. Variance in device parameters are managed to maintain high performance over a wide temperature range. Layout and packaging considerations that would affect long term reliability are addressed. The amplifier is well characterized above 200°C and attains much higher performance than amplifiers not optimized for high temperature operation. Comprehensive reliability testing over temperature has been completed.

A super-thermostable, flexible supercapacitor for ultralight and high performance devices

2020 ◽  
Vol 8 (2) ◽  
pp. 532-542 ◽  
Author(s):  
Dong Won Kim ◽  
Sung Mi Jung ◽  
Hyun Young Jung
Keyword(s):  
High Temperature ◽  
Energy Density ◽  
Polymer Composite ◽  
High Performance ◽  
Composite Electrolytes ◽  
Graphene Aerogel ◽  
High Capacitance ◽  
Flexible Supercapacitor ◽  
Flexible Supercapacitors ◽  
High Temperature Operation

High-temperature operation and flexible supercapacitors are designed from graphene aerogel electrodes and IL-FSN based polymer composite electrolytes, achieving a high capacitance of 1007 F g−1 and an energy density of 1134 Wh kg−1 at 200 °C.

Development of Electrode Structure for High Performance Fuel Cell Using CAE

2010 ◽  
Author(s):  
Joji Tomiyasu ◽  
Takashi Harada ◽  
Makoto Fujiuchi ◽  
Takaji Inamuro ◽  
Shiaki Hyodo ◽  
...  
Keyword(s):  
High Temperature ◽  
Fuel Cell ◽  
High Performance ◽  
Flow Simulation ◽  
Gas Diffusion ◽  
Polymer Electrolyte Fuel Cell ◽  
Structural Factors ◽  
Electrode Structure ◽  
Cold Starting ◽  
High Temperature Operation

Cold starting performance and high temperature operation are current issues in the development of high performance polymer electrolyte fuel cell (PEFC) electrodes. Although excess water must be removed to improve these aspects of electrode performance, it is also important to adopt a structure that prevents the electrodes from drying up. In the face of this conflicting relationship, it is therefore difficult to design an electrode structure with the required properties. For this reason, using technology jointly developed with Kyoto University and Toyota R&D Labs., Inc., the relationship between structural factors and performance was identified by applying a two-phase flow simulation to the complex microstructure of the gas diffusion layer (GDL) to optimize the electrode structure. As a result, an electrode structure was designed that improves high temperature operation while maintaining cold starting performance. The simulation results were then validated by experiments.

scholarly journals A Particle/sCO2 Heat Exchanger Testbed and Reference Cycle Cost Analysis

2016 ◽  
Author(s):  
Matt D. Carlson ◽  
Clifford K. Ho
Keyword(s):  
High Temperature ◽  
Heat Exchanger ◽  
Power System ◽  
High Performance ◽  
Solar Thermal ◽  
Test Facility ◽  
Thermal Test ◽  
Power Block ◽  
High Temperature Operation ◽  
Industry Experience

The high-temperature particle – supercritical carbon dioxide (sCO2) Brayton power system is a promising option for concentrating solar power (CSP) plants to achieve SunShot metrics for high-temperature operation, efficiency, and cost. This system includes a falling particle receiver to collect solar thermal radiation, a dry-cooled sCO2 Brayton power block to produce electricity, and a particle to sCO2 heat exchanger to couple the previous two. While both falling particle receivers and sCO2 Brayton cycles have been demonstrated previously, a high temperature, high pressure particle/sCO2 heat exchanger has never before been demonstrated. Industry experience with similar heat exchangers is limited to lower pressures, lower temperatures, or alternative fluids such as steam. Sandia is partnering with three experienced heat exchanger manufacturers to develop and down-select several designs for the unit that achieves both high performance and low specific cost to retire risks associated with a solar thermal particle/sCO2 power system. This paper describes plans for the construction of a particle sCO2 heat exchanger testbed at Sandia operating above 700 °C and 20 MPa, with the ability to couple directly with a previously-developed falling particle receiver for on-sun testing at the National Solar Thermal Test Facility (NSTTF).

High-Temperature Operation of Photonic-Crystal Lasers for On-Chip Optical Interconnection

2012 ◽  
Vol E95.C (7) ◽  
pp. 1244-1251 ◽  
Author(s):  
Koji TAKEDA ◽  
Tomonari SATO ◽  
Takaaki KAKITSUKA ◽  
Akihiko SHINYA ◽  
Kengo NOZAKI ◽  
...  
Keyword(s):  
High Temperature ◽  
Photonic Crystal ◽  
Optical Interconnection ◽  
On Chip ◽  
High Temperature Operation

KUBOTA UCX

Alloy Digest ◽  
2008 ◽  
Vol 57 (6) ◽  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Temperature Performance ◽  
High Temperature Operation ◽  
Oxidation And Corrosion ◽  
Very High

Abstract Kubota UCX was developed for very high temperature operation for ethylene pyrolysis service. The alloy also has excellent oxidation and corrosion resistance. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on high temperature performance and corrosion resistance as well as casting and joining. Filing Code: Ni-663. Producer or source: Kubota Metal Corporation, Fahramet Division.

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