scholarly journals R and D: technology assessment heat-engine components

1977 ◽  
Author(s):  
Not Given Author
Keyword(s):  
Technology Assessment ◽  
Heat Engine ◽  
R And D ◽  
Engine Components

scholarly journals OPTIMIZATION OF MECHANICAL STRENGTH OF ROTARY-VANE ENGINE

2017 ◽  
Vol 3 ◽  
pp. 357
Author(s):  
Yury Zhuravlev ◽  
Andrey Perminov ◽  
Yury Lukyanov ◽  
Sergey Tikhonov ◽  
Alexander Ilyin ◽  
...  
Keyword(s):  
Mechanical Strength ◽  
Heat Engine ◽  
Fluid Pressure ◽  
Internal Combustion ◽  
Working Fluid ◽  
Drive Torque ◽  
Cam Mechanism ◽  
Inertial Moment ◽  
Engine Components ◽  
External Combustion

The article discusses a rotory-vane heat engine with a lever-cam mechanism motion conversion (an engine may be an internal combustion or external combustion). The output shaft of the engine adds drive torque from the working fluid pressure forces acting on the blade and the inertial moment of the forces of inertia of engine components. The mechanical strength of the motor is dependent on the magnitude and phase of these two torque. The purpose of the article is to determine the conditions under which mechanical strength is minimized.

Development of Scaling Model for a MEMS-Based Micro Heat Engine

2010 ◽  
Author(s):  
H. Bardaweel ◽  
B. S. Preetham ◽  
R. Richards ◽  
C. Richards ◽  
M. Anderson
Keyword(s):  
Combustion Engine ◽  
Heat Engine ◽  
Working Fluid ◽  
Thin Membranes ◽  
Micro Heat Engine ◽  
Heat Of Evaporation ◽  
Major Factors ◽  
Engine Components ◽  
External Combustion ◽  
Thermal Physical Properties

In this work we investigate issues related to scaling of a MEMS-based resonant heat engine. The engine is an external combustion engine made of a cavity encapsulated between two thin membranes. The cavity is filled with saturated liquid-vapor mixture working fluid. We use both model and experiment to investigate scaling of the MEMS-based resonant heat engine. The results suggest that the performance of the engine is determined by three major factors: geometry of the engine, speed of operation, and thermal physical properties of engine components. Larger engine volumes, working fluids with higher latent heat of evaporation, slower engine speeds, and compliant expander structures are shown to be desirable.

Characterization of SiC fiber-reinforced SiC composites by TEM

1994 ◽  
Vol 52 ◽  
pp. 632-633
Author(s):  
K. Park ◽  
C. Sung
Keyword(s):  
Heat Engine ◽  
Porous Matrix ◽  
Fiber Reinforced ◽  
Ion Milling ◽  
Cross Sectional ◽  
Sic Fiber ◽  
Diffraction Patterns ◽  
Sic Composites ◽  
Engine Components ◽  
Porous Sic

SiC fiber-reinforced SiC composites have been accepted to have considerable potential as an engineering structural ceramic for numerous high-temperature applications, such as various heat engine components. In this study, the microstructure of matrix, fiber, and matrix/fiber interface of SiC fiber (SCS-6, Textron)-reinforced nitrogen-treated SiC composites was characterized using transmission electron microscopy (TEM). Cross-sectional TEM samples were prepared by mechanical grinding, dimpling, and ion-milling. The samples were analyzed using a Philips EM400T TEM and a Noran ultrathin window Micro-Z detector.The α-Si3N4 was formed in the porous SiC matrix by nitriding (Fig. 1(a)). The porous SiC matrix can permit easy and continuous penetration of the nitriding gas and rapid escape of the reaction and volatilization products, thus favoring vapor-phase reactions. In the case of huge SiC grains, the α-Si3N4 was formed at the surface of the huge SiC grains. Rod-shaped Si2N2O phase was often observed in the porous matrix. Figs. 1(b), (c), and (d) show electron diffraction patterns obtained from the α-SiC, α-Si3N4, Si2N2O phases, respectively.

Advanced Machining Technology for Gas Turbine and Heat Engine Components

2006 ◽  
Vol 45 ◽  
pp. 1765-1770
Author(s):  
Vimal K. Pujari ◽  
Ara Vartabedian ◽  
William T. Collins
Keyword(s):  
Systems Approach ◽  
Heat Engine ◽  
Cutting Tools ◽  
Cost Effective ◽  
Machining Parameters ◽  
Forming Technology ◽  
Fabrication Procedure ◽  
Advanced Machining ◽  
Ceramic Manufacturing ◽  
Engine Components

Cost effective ceramic manufacturing with green and dense machining perspectives has been described. An advanced CNC green machining based complex shape forming technology developed at Saint-Gobain is described which has been shown to be robust and capable of rapid prototyping. Utilizing a systems approach involving green blank properties, type of cutting tools and machining parameters the procedure has been optimized. Integral Bladed Rotors (IBR) for microturbine applications have been fabricated with dimensional controls within 0.15% and successfully spin tested at 143330 rpm without failure. Following this approach, a cost effective machining and prototype fabrication procedure is under development for IBR and Vane rings for various civilian and military applications.

Processing Methods for High Reliability Silicon Nitride Heat Engine Components

1995 ◽  
Vol 117 (1) ◽  
pp. 156-160 ◽  
Author(s):  
V. K. Pujari ◽  
D. M. Tracey
Keyword(s):  
Tensile Strength ◽  
Silicon Nitride ◽  
Process Control ◽  
High Reliability ◽  
Heat Engine ◽  
High Strength ◽  
Processing Unit ◽  
Unit Operations ◽  
Engine Components ◽  
Strength Database

The paper discusses highlights of a silicon nitride processing methodology that has been developed in the course of a major four-year DoE funded program in processing for reliability. The program focused on the attainment of high strength and reliability through the identification and subsequent control of strength-degrading flaws introduced during processing unit operations. Process control and NDE methods applied to achieve an optimized process with the potential to produce high-reliability advanced heat engine components are discussed. Concluding remarks are directed to the extensive tensile strength database that has been generated through testing of over 300 tensile rods produced by the optimized process.

GTE Sintered Silicon Nitride

1984 ◽  
Author(s):  
C. L. Quackenbush ◽  
J. T. Smith
Keyword(s):  
Silicon Nitride ◽  
Weibull Modulus ◽  
Heat Engine ◽  
Future Directions ◽  
Heat Engines ◽  
The Status ◽  
Density Surface ◽  
Microstructure Density ◽  
Engine Components ◽  
Sintered Silicon

A status of GTE sintered silicon nitride for advanced heat engines will be presented. This will include an update of: sintering and final properties for a number of GTE silicon nitride compositions, microstructure, density, surface finish, strength, Weibull modulus, oxidation resistance, fracture toughness etc. The status of heat engine components fabricated by injection molding or isopressed/green machining and their performance will be reviewed along with correlations between the shape fabrication technique, strength, and Weibull modulus. Costs and availability will be included where possible. Future directions for increased reliability in silicon nitride structural ceramics will be summarized.

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