Advanced Power Train Program Analysis. Quarterly Summary, October-December 1984

摘要

Pending a firm date for the anticipated direct measurements of the secondary flow strength in the Avco Mark VI high interaction experiments with Mississippi State University instrumentation, STD Research Corporation has limited its three-dimensional analysis of the Mark VI experiments to simulations of data already obtained. Neither the simulations nor the experimental data indicate the formation of the kind of strong current constriction on either electrode that was observed in the STD prediction and subsequent observations at the AEDC High Performance Demonstration Experiment. The nominal conditions of the direct measurements of MHD-induced secondary flows at Stanford University have been simulated with three-dimensional MHD codes. Preliminary indications are that there is satisfactory agreement between the simulation and the measurements of the qualitative behavior and quantitative data. Following the STD simulation, and at the suggestion of STD, the Stanford experimenters looked for and found axial velocity profile skewing over the electrodes. As shown by the simulations, this skewing is caused by the MHD-driven secondary flows; such skewing has important implications for the performance of such high performance MHD generators as are being considered for the proof-of-concept demonstration. More definitive experiments have been carried out recently at Stanford, and STD is working to complete detailed simulations of the new experimental conditions so that a detailed comparison of measured and calculated values may be carried out. While the STD/MHD codes have been validated previously at similar levels of MHD interaction, the simulations of the Stanford experiments have extended the range of validation to very low speeds and small scales. (ERA citation 10:039380)