Augmentation of hypersonic propulsion test facilities using MHD

Nelson, Gordon L.; Simmons, G. A.

doi:10.2514/6.1995-1937

Cited by 3 publications

(2 citation statements)

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“…Further, at low temperatures where conductivity is insignificant for the unseeded gas, the theory shows that the seeded gas achieves a dramatic increase of as much as 3 orders in magnitude increase in electrical conductivity. Alkali seeding has been suggested by various authors [5,6,16] as a means of increasing the electrical conductivity of high-temperature gases, within the context of hypersonic vehicle and ground test applications, due to the low ionization potential of alkali salts.…”

Section: Literature Surveymentioning

confidence: 99%

“…Interest in magnetohydrodynamic (MHD) accelerators and decelerators [1,2], hypersonic flow control [3], power extraction from hypersonic flows [4,5] and hypersonic ground test facilities capable of true altitude simulation [6] has emphasized the need for a better understanding of the conductivity of the high-enthalpy, high-pressure gas involved. For example, the MHD accelerator utilizes the Lorentz J × B body force to increase the fluid velocity, pressure and temperature.…”

Section: Introductionmentioning

confidence: 99%

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Electrical conductivity channel for a shock tube

Liu

Wilson

2005

Meas. Sci. Technol.

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The design of an electrical conductivity measurement channel for a shock tube is described. This measurement channel is used for the study of weakly ionized, high-enthalpy flows of gases seeded with alkali salts. The theory for determining the dimensions of the measurement channel and the electrical power supply for the channel is based on Ohm's law. Data are shown which demonstrate that the channel performs well. However, the measured electrical conductivity was one or two orders less than theoretical values. The current traces for each case show that the peak current occurred behind the contact surface, which indicates that some of the seed was entrained behind the test gas originally in the driven tube. An analysis of the effect of Joule heating on the measured conductivity was conducted. The result of increased temperature due to Joule heating in the measurement channel is believed to be minimal. Reasons for the discrepancy are given.

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Section: Literature Surveymentioning

confidence: 99%