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Research Containing: Contaminant deposits

Conditions of formation of stable deposits of incomplete combustion products of liquid rocket fuels on the external elements of orbital stations

by on 9 June 2015in Technology Development & Demonstration No comment

The results of the Dvicon and Kromka-1 space experiments aimed at studying the state of contaminant deposits on control samples exposed for a long time in the zone of emission incomplete combustion products from the orientation engines of the Mir Orbital Station and International Space Station. An analysis of the data on the intensity of the action of incomplete combustion products on the control samples during the space experiments made it possible to formulate a critical condition of formation of stable dry deposits of toxic contaminants.

Related URLs:
http://dx.doi.org/10.1134/S1990793108050205

Methodology of studying the parameters of contaminant emissions from the orientation engines of orbital stations during and after the flight

by on 9 June 2015in Technology Development & Demonstration No comment

The methodology of space experiments aimed at studying the dynamics of the emission of contaminants from the nozzles of the orientation engines of orbital stations is described. It was demonstrated that the use of passive diagnostic means, such as plates with special coatings and porous absorbents exposed for a long time near the engines, makes it possible to determine the quantitative characteristics and spatial distribution of incomplete combustion products.

Related URLs:
http://dx.doi.org/10.1134/S1990793108050217

 Root Cause Assessment of Pressure Drop Rise of a Packed Bed of Lithium Hydroxide in the International Space Station Trace Contaminant Control System

by on 9 June 2015in Biology & Biotechnology No comment

The trace contaminant control system (TCCS) located in the International Space Station's (ISS) U.S. laboratory module employs physical adsorption, thermal catalytic oxidation, and chemical adsorption to remove trace chemical contamination produced by equipment offgassing and anthropogenic sources from the cabin atmosphere. The chemical adsorption stage, consisting of a packed bed of granular lithium hydroxide (LiOH), is located after the thermal catalytic oxidation stage and is designed to remove acid gas byproducts that may be formed in the upstream oxidation stage. While in service on board the ISS, the LiOH bed exhibited a change in flow resistance that leading to flow control difficulties in the TCCS. Post flight evaluation revealed LiOH granule size attrition among other changes. An experimental program was employed to investigate mechanisms hypothesized to contribute to the change in the packed bed's flow resistance. Background on the problem is summarized, including a discussion of likely mechanisms. The experimental program is described, results are presented, and implications for the future are discussed.

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