Study of the Dynamics of Contaminating Substances Emission from Control Liquid Propellant Low-Thrust Jet Engines during Their Pulse Firings and Verification of the Effectiveness of Deflectors for the Protection of ISS External Surfaces from from Contamination (KROMKA) - 06.06.18

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Study of the Dynamics of Contaminating Substances Emission from Control Liquid Propellant Low-Thrust Jet Engines during Their Pulse Firings and Verification of the Effectiveness of Deflectors for the Protection of ISS External Surfaces from Contamination (Kromka) studies the dynamics of contaminating substance emissions from control liquid propellant low-thrust jet engines during their pulse firings and studies the verification of the effectiveness of devices for the protection of ISS external surfaces from contamination.
Science Results for Everyone
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The following content was provided by Yu I. Gerasimov, and is maintained in a database by the ISS Program Science Office.
Experiment Details

OpNom:

Principal Investigator(s)
Yu I. Gerasimov, Keldysh Research Center, Russia

Co-Investigator(s)/Collaborator(s)
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Developer(s)
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Sponsoring Space Agency
Russian Federal Space Agency (Roscosmos)

Sponsoring Organization
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Research Benefits
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ISS Expedition Duration
August 2001 - December 2002; November 2002 - May 2003; April 2003 - September 2006

Expeditions Assigned
3,4,5,6,7,8,9,10,11,12,13

Previous Missions
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Experiment Description

Research Overview
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Description
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Applications

Space Applications
The introduction of deflectors on the control liquid propellant low-thrust jets will significantly decrease the deterioration of solar arrays, radiators, and other ISS components by extending their on-orbit service lives, and will decrease the risk of crewmembers’ spacesuit contamination upon contact with surfaces during extravehicular activity.

Earth Applications
The Earth Application for this investigation has yet to be identified.

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Operations

Operational Requirements and Protocols
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Decadal Survey Recommendations

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Results/More Information

The studies included analysis of the chemical composition of fuel/oxidizer reaction products (FORP), visual and instrument-aided analysis of the composition of FORP deposits samples, analysis of the changes of sample optical characteristics, and densitometry of the images of control tablets. Using a specially developed procedure, the balance between the mass of deposited and vaporized FORP was determined. It was established that a deflector effectively limits the contamination area from roll thrusters with an angle of ~45°, thus preventing contamination of structural elements of the ISS Service module. Based on the study results, an angular distribution of FORP in the plume was obtained and used to calculate the predicted contaminating effect of ISS Service module roll thrusters on structural elements and exterior surfaces. During the 4 stages of the Kromka space experiment, the assumptions on the mechanisms of FORP emissions from attitude thruster nozzles into the surrounding area were confirmed, which were determined based on the results of experiments in pressure chambers using actual thrusters and simulated nozzles.

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Results Publications

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Ground Based Results Publications

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ISS Patents

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Related Publications

    Rebrov SG.  The Contamination Impact on Spacecraft of Control Liquid-propellant Low-thrust jets Using Nitrogen Tetroxide and UDMH Components. 3rd International Conference on Small Satellites, Korolev, Russia; 2002

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Related Websites
Energia - Science Research on the ISS Russian Segment

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Imagery

image One of the specimen boards.
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