Factors influencing electro-fluid dynamic power generation.

1967 ◽  
Vol 4 (8) ◽  
pp. 961-966 ◽  
Author(s):  
HAROLD E. BRANDMAIER ◽  
T. HERBERT DIMMOCK
Keyword(s):  
Power Generation ◽  
Fluid Dynamic ◽  
Dynamic Power ◽  
Factors Influencing

Extended 3-D Thermo-Hydrodynamic Model of Radial Foil Bearing

2011 ◽  
Author(s):  
Daejong Kim ◽  
Jeongpill Ki ◽  
Youngcheol Kim ◽  
Kookyoung Ahn
Keyword(s):  
Power Generation ◽  
Thermal Contact Resistance ◽  
Fluid Dynamic ◽  
Thermal Contact ◽  
Leading Edge ◽  
Cfd Model ◽  
Thermal Boundary Conditions ◽  
Foil Bearing ◽  
Axial Temperature ◽  
Cooling Air

A turbine simulator with foil bearing supports mimicking 50kW power generation gas turbine was designed. In this paper, the 3-D thermo-hydrodynamic (THD) model developed for single radial FB was further extended to the turbine simulator configuration by extending the solution domains to surrounding structures. In addition, a computational fluid dynamic (CFD) model on the leading edge groove on the foil bearing was developed for better prediction of inlet thermal boundary conditions for the bearing. Several case studies are presented for hydrodynamically preloaded three-pad radial FB in the hot section. It is found that both bearing and rotor should be provided with cooling air to maintain both the rotor and top foil below 300°C. It is also found that the higher thermal contact resistance between the rotor and hot impellers reduces the axial temperature gradient of the rotor.

Extended Three-Dimensional Thermo-Hydrodynamic Model of Radial Foil Bearing: Case Studies on Thermal Behaviors and Dynamic Characteristics in Gas Turbine Simulator

2012 ◽  
Vol 134 (5) ◽  
Author(s):  
Daejong Kim ◽  
Jeongpill Ki ◽  
Youngcheol Kim ◽  
Kookyoung Ahn
Keyword(s):  
Power Generation ◽  
Elevated Temperature ◽  
Gas Turbine ◽  
Case Studies ◽  
Fluid Dynamic ◽  
Thermal Contact ◽  
Linear Perturbation ◽  
Softening Effect ◽  
Axial Thrust ◽  
Environment Friendly

Environment-friendly microturbomachinery has its broad current and future applications in fuel cells, power generation, oil-free industrial blowers and compressors, small aero propulsions engines for missiles and small aircrafts, automotive turbo chargers, etc. Air foil bearings (AFBs) have been one of the popular subjects in recent years due to ever-growing interests in the environment-friendly oil-free turbomachinery. AFBs have many noticeable attractive features compared to conventional rigid-walled air/gas bearings such as improved damping and tolerance to minor shaft misalignment and external shocks. In addition, the low viscosity of air or gas allows very low power consumption even at high speeds. A turbine simulator mimicking 50 kW power generation gas turbine was designed. The turbine simulator can generate the same thermodynamic conditions and axial thrust load as the actual gas turbine. In this paper, the 3-D thermo-hydrodynamic (THD) model developed for single radial AFB was further extended to the turbine simulator configuration by extending the solution domain to the surrounding structures including two plenums, bearing sleeve, housing, and rotor exposed to the plenums. In addition, a computational fluid dynamic (CFD) model on the leading edge groove region was developed for better prediction of inlet thermal boundary conditions for the bearing. Several case studies are presented through computer simulations for hydrodynamically preloaded three-pad radial AFB in the hot section. It is found that both bearing and rotor should be provided with cooling air to maintain the temperature of both the rotor and top foil below 300 °C. It is also found that the higher thermal contact resistance between the rotor and hot impellers reduces the axial temperature gradient of the rotor. Dynamic performance of the bearing was evaluated using the linear perturbation method for operation at elevated temperature. The softening effect of the bump foil at elevated temperature results in a decrease of both stiffness and damping coefficients compared to the values at room temperature.

High-Efficiency Solar Dynamic Space Power Generation System

1991 ◽  
Vol 113 (3) ◽  
pp. 131-137 ◽  
Author(s):  
Aristide Massardo
Keyword(s):  
Power Generation ◽  
Power Systems ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Combined Cycle ◽  
Working Fluid ◽  
Brayton Cycle ◽  
Generation System ◽  
Dynamic Power ◽  
Power Generation System

Space power technologies have undergone significant advances over the past few years, and great emphasis is being placed on the development of dynamic power systems at this time. A design study has been conducted to evaluate the applicability of a combined cycle concept—closed Brayton cycle and organic Rankine cycle coupling—for solar dynamic space power generation systems. In the concept presented here (solar dynamic combined cycle), the waste heat rejected by the closed Brayton cycle working fluid is utilized to heat the organic working fluid of an organic Rankine cycle system. This allows the solar dynamic combined cycle efficiency to be increased compared to the efficiencies of two subsystems (closed Brayton cycle and organic fluid cycle). Also, for small-size space power systems (up to 50 kW), the efficiency of the solar dynamic combined cycle can be comparable with Stirling engine performance. The closed Brayton cycle and organic Rankine cycle designs are based on a great deal of maturity assessed in much previous work on terrestrial and solar dynamic power systems. This is not yet true for the Stirling cycles. The purpose of this paper is to analyze the performance of the new space power generation system (solar dynamic combined cycle). The significant benefits of the solar dynamic combined cycle concept such as efficiency increase, mass reduction, specific area—collector and radiator—reduction, are presented and discussed for a low earth orbit space station application.

Latent heat thermal storage for solar dynamic power generation

Solar Energy ◽  
1993 ◽  
Vol 51 (3) ◽  
pp. 169-173 ◽  
Author(s):  
C. Bellecci ◽  
M. Conti
Keyword(s):  
Power Generation ◽  
Latent Heat ◽  
Thermal Storage ◽  
Dynamic Power
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