Carbonaceous Deposit Density in a Fuel-Film Cooled Rocket Combustor
Abstract
Hydrocarbon fuel-film cooled rocket combustors develop carbonaceous deposits that insulate regenerative cooling jackets from the chamber hot gases. These deposits are formed in conditions atypical for combustion soot literature: at pressures over 5 MPa, in forced convection flows with Ma > 0.2 gaseous core flows, and on highly cooled walls with heat fluxes over 10 MW/sq m. Accurate modeling of these conditions requires thermophysical properties and deposition parameters for carbonaceous deposits. Previous studies have demonstrated multilayer deposition in fuel-film cooled combustors likely occurring due to a combination of heterogeneous condensation of polycyclic aromatic hydrocarbons and thermophoretic diffusion of combustion soot [1]. Figure 1 shows a typical sample and distinguishes dense from soot layers. Differences in chemical and physical structure cause the condensed (abbreviated to dense) and soot deposit layers to have different properties. Therefore, all relevant thermophysical properties will be required for both layers to develop accurate heat transfer models.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 2021
- Accession Number
- AD1149140
Entities
People
- Philip M. Piper
- Timothee L. Pourpoint
Organizations
- Air Force Research Laboratory