Rpt. on the MHD Performance Demonstration Experiment for the Period Oct. 1 1977 to Sep. 30, 1978 PDF Download
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Author:
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Category : Magnetohydrodynamic generators
Languages : en
Pages :
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Book Description
Author:
Publisher:
ISBN:
Category : Magnetohydrodynamic generators
Languages : en
Pages :
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Book Description
Author:
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Category :
Languages : en
Pages :
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Author: United States. Air Force. Arnold Engineering Development Center
Publisher:
ISBN:
Category : Electric power production
Languages : en
Pages : 140
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Author:
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Category :
Languages : en
Pages :
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Book Description
The objective of this experimental research, initiated in December 1973, is to demonstrate the attainment of MHD performance on a sufficiently large scale to verify that the projected efficiency of the commercial MHD concept is viable. To perform the experiment, an existing facility at the Arnold Engineering Development Center was refurbished and the new systems required for performing the experiment have been designed and built. In particular, the largest systems which have required the greatest portion of the expended effort are the generator channel and 6 Tesla (T) cryogenically cooled magnet. The generator channel is now complete and the magnet is approximately 85 percent complete. Proof testing of various components has been performed to the extent possible and extensive testing of the plasma generator with its ancillary systems in particular has been completed. During the period between October 1, 1978 and December 31, 1978, the assembly of the magnet continued with the installation of the force containment structure (FCS) and upper pole steel being completed. Final placement of the magnet was accomplished and initial testing of the magnet performance was started. In the course of this testing, an arc over occurred in the outlet end coolant tubes and the testing was terminated to effect remedial repairs. Prior to the arc over, three successful powered tests with a peak field strength slightly greater than 2 T were performed. Fabrication of the components for the subsonic diffuser and alignment of the generator channel sections on the channel cart were also completed in this period.
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Languages : en
Pages :
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The Arnold Engineering Development Center (AEDC) has been under contract with the Department of Energy (DOE) since December 1973 to conduct a magnetohydrodynamic (MHD) High Performance Demonstration Experiment (HPDE). The objective of this experimental research is to demonstrate the attainment of MHD performance on a sufficiently large scale to verify that projected commercial MHD objectives are possible. This report describes the testing of the system under power-producing conditions during the period from October 1, 1980 to September 30, 1981. Experimental results have been obtained with the channel configured in the Faraday mode. Test conditions were selected to produce low supersonic velocity along the entire channel length. Tests have been conducted at magnetic fields up to 4.1 Tesla (T) (70% of design). Up to 30.5 MW of power has been produced to date (60% of design) for an enthalpy extraction of approximately 11%. The high Hall voltage transient, observed during the previous series of tests has been reduced. The reduction is mostly probably due to the fuel and seed being introduced simultaneously. The replacement of the ATJ graphite caps on the electrode walls with pyrolytic graphite caps has resulted in significantly higher surface temperature. As a result, the voltage drop is some 60% of the cold wall voltage drop during the previous series of tests. However, the absolute value of the present voltage drop is still greater than the original design predictions. Test results indicate, however, that the overall enthalpy extraction objective can be achieved.
Author: Arnold Engineering Development Center
Publisher:
ISBN:
Category :
Languages : en
Pages : 24
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Author: Arnold Engineering Development Center
Publisher:
ISBN:
Category : Electric power production
Languages : en
Pages : 152
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Book Description
Author: Arnold Engineering Development Center
Publisher:
ISBN:
Category : Magnetohydrodynamic generators
Languages : en
Pages : 28
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Author: G. L. Whitehead
Publisher:
ISBN:
Category :
Languages : en
Pages : 183
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Book Description
Author: Andrew W. Lo
Publisher: Princeton University Press
ISBN: 1400829097
Category : Business & Economics
Languages : en
Pages : 449
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Book Description
For over half a century, financial experts have regarded the movements of markets as a random walk--unpredictable meanderings akin to a drunkard's unsteady gait--and this hypothesis has become a cornerstone of modern financial economics and many investment strategies. Here Andrew W. Lo and A. Craig MacKinlay put the Random Walk Hypothesis to the test. In this volume, which elegantly integrates their most important articles, Lo and MacKinlay find that markets are not completely random after all, and that predictable components do exist in recent stock and bond returns. Their book provides a state-of-the-art account of the techniques for detecting predictabilities and evaluating their statistical and economic significance, and offers a tantalizing glimpse into the financial technologies of the future. The articles track the exciting course of Lo and MacKinlay's research on the predictability of stock prices from their early work on rejecting random walks in short-horizon returns to their analysis of long-term memory in stock market prices. A particular highlight is their now-famous inquiry into the pitfalls of "data-snooping biases" that have arisen from the widespread use of the same historical databases for discovering anomalies and developing seemingly profitable investment strategies. This book invites scholars to reconsider the Random Walk Hypothesis, and, by carefully documenting the presence of predictable components in the stock market, also directs investment professionals toward superior long-term investment returns through disciplined active investment management.
