Impurity Measurements in the Expansion Tube
An assessment is given on the importance of impurities in expansion tube flow, using the results of spectroscopic measurements. The expansion tube is a new type facility which produces high energy, high Mach number flows. It has been used at the Ballistic Research Laboratories for the study of nonequilibrium effects in high temperature gases. However, there has been a special problem regarding impurities and contamination of the expansion tube flow, which is related to the operation of the facility, shown schematically in Figure 1. A knowledge of the impurity concentration is desirable, since impurities are well known to be very prominent radiators, and even small concentrations could make invalid measurements of the total radiation, say, from shock layers about models.
KeywordsShock Tube Shock Layer Expansion Tube Total Number Density Expansion Section
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