Verification of the Effectiveness of Devices for the Protection of the Exterior Surface of ISS from Contaminants Deposited by Pulsed Cycling of Liquid-Jet (Kromka) - 08.05.15

Overview | Description | Applications | Operations | Results | Publications | Imagery

ISS Science for Everyone

Science Objectives for Everyone
Kromka investigates the contamination of critical external surfaces (such as radiators, solar arrays, etc) caused by propulsion thrusters of the various vehicles flying to the ISS and is assessing the efficiency of various gas-dynamic protective devices to minimize thruster 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


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

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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 - September 2006

Expeditions Assigned

Previous ISS Missions
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Experiment Description

Research Overview
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Checkout of the efficiency of operation of gas-dynamic protective devices accommodated on the Service module and designed to protect the ISS surfaces against contaminants produced by pulse activation of control liquid-jet thrusters. Study of the effect of contaminants deposition on the characteristics of materials specimens and external coatings of the ISS elements (radiators, solar array panels, etc.).

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Space Applications
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Earth Applications
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Operational Requirements
Boards with materials specimens.

Operational Protocols
Installation of boards with materials specimens on the external surface of the Zvezda Service module (SM) of the ISS RS in the periphery area of the jet of the thrusters nozzles during extravehicular activity. Passive exposure of the boards on the SM external surface. Dismounting of the boards after long-duration exposure during extravehicular activity and their return to the ground for processing of the experiment results.

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Results/More Information

Assessment of the efficiency of gas-dynamic protective devices and development of recommendations (if necessary) on possible modifications thereof.

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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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image One of the specimen boards.
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