Photographic Flame Studies in the Gasoline Engine

Abstract

MEANS of an apparatus developed especially for the purpose, photographs have been taken of combustion in the gasoline engine as it appeared through a narrow quartz window that extended over the entire length of the combustion chamber. A simultaneous record of the changes in pressure in the engine cylinder was also obtained by photographic means.The flame records, which were taken on moving films, consist essen-

Emission Spectra of Engine Flames

“…The single-cylinder ell-head engine equipped with a long quartz window extending the full length of the combustion chamber has been described in previous papers (23,24). A stroboscopic disk was rotated at crank-shaft speeds in a horizontal plane above the engine in such a manner that the slot in the disk passed along the window in a direction opposite to the motion of the flames.…”

Spectroscopic Studies of Engine Combustion

“…The only difference observed in these two types of explosions was in the rate of inflammation of the latter portions of the charge, which rate is very high in knocking explosions as may be seen from Figure 1. Therefore, a comparison of the spectra of flame fronts in Gasoliue (knocking) 12 Gasoline (uot knocking) 13 Gasoline and Ethyl fluid (not knocking) 14 Gasoline and Ethyl fluid. Disk not used.…”

Optical diagnostics for direct injection gasoline engine research and development

“…It is important to realize that mixing and combustion in the enclosure of the engine cylinder will be significantly affected by the physical boundaries and therefore, since early on in the development of internal combustion engines, researchers have thought of ways to study internal combustion engine phenomena through the use of optical engines (Rassweiler and Withrow, 1938;Withrow and Boyd, 1931;Bowditch, 1960). The direct observation of flame initiation, growth and extinction, and correlation of these data with, e.g., pressure measurements, quickly gained in importance.…”