Effects of fuel additives on plume opacity of a sub-scale turbojet test cell with a ramjet type dump-combustor

Abstract

An initial investigation was conducted into the effects of metallic based fuel additives on smoke reduction in turbo-jet test cells. Experiments were conducted on a one-eighth scale turbojet test cell with a ramjet type dump-combustor. Measurements of particle sizes and concentrations were made using light transmittance at two wavelengths. Particulate samples were collected and examined with a scanning electron microscope. Increased combustor temperatures and fuel additives appeared to affect particle size and concentration primarily downstream of the engine exhaust. Recommendation are made for experimental technique improvements which are required to improve the quality of the data.