The N.A.C.A. Photographic Apparatus for Studying Fuel Sprays from Oil Engine Injection Valves and Test Results from Several Researches
A 1928 technical report from the N.A.C.A. (National Advisory Committee for Aeronautics), issued for engineers and researchers, describing a photographic apparatus for studying fuel sprays from oil engine injection valves. Its graphs plot spray penetration in inches against time in seconds, against chamber pressure and fuel specific gravity, and its photographs record spray shapes at varying chamber pressures. A designer might take from it the raw form of fuel spray plumes: fine vertical jets that widen into soft clouds as pressure rises.
