Accession Number:

ADA235644

Title:

Hydrocarbon-Fuel/Combustion-Chamber-Liner Materials Compatibility

Descriptive Note:

Final rept. 31 Oct 1989-31 Mar 1991

Corporate Author:

AEROJET PROPULSION DIV SACRAMENTO CA

Personal Author(s):

Report Date:

1991-04-01

Pagination or Media Count:

124.0

Abstract:

The results of dynamic tests using methane and NASA-Z copper test specimen under conditions that simulate those expected in the cooling channels of a regeneratively cooled LOXhydrocarbon booster engine operating at chamber pressures up to 3000 psi are presented. Methane with less than 0.5 ppm sulfur contamination has little or no effect on cooling channel performance. At higher sulfur concentrations, severe corrosion of the NASA-Z copper alloy occurs and the cuprous sulfide, Cu2S, thus formed impedes mass flow rate and heat transfer efficiency. Therefore, it is recommended that the methane specification for this end use set the allowable sulfur content at 0.5 ppm max. Bulk high purity liquid methane that meets this low sulfur requirement is currently available from only one producer. Pricing, availability, and quality assurance are discussed in detail. Additionally, it was found that dilute sodium cyanide solutions, i.e. 5 ww, effectively refurbish sulfur corroded cooling channels in only 2-5 minutes by completely dissolving all the Cu2S. Sulfur corroded sodium cyanide refurbished channels are highly roughened and the increase surface roughness leads to significant improvements in heat transfer efficiency with an attendant loss in mass flow rate. Both the sulfur corrosion and refurbishment effects are discussed in detail.

Subject Categories:

  • Jet and Gas Turbine Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE