Consideration in the Design of Low Pressure Gas Burners

摘要

The main factors affecting the stability of the flame are gas composition, jet velocity, and pressure. These must be maintained constant to 0.1% to obtain reasonable resolution. (A drift in the flame front of plus or minus 0.03mm was considered tolerable.) In addition, one must consider the effects of turbulence, drafts, convection currents, oscillations in the burner chamber and pipes, and flow instability in the flame itself. After considerable trial and error, a burner system was devised which met the requirements. It will maintain a flame whose front remains so fixed that its image can be held in the cross hairs of a thirty power telemicroscope with no visible excursions over periods of several minutes. It is simple in design and construction and has many advantages from the standpoint of operation. The critical requirements of the apparatus was discussed under the headings: (1) pressure regulation, (2) flow regulation, (3) control of drafts and convection currents, (4) suppression of oscillations, (5) suppression of turbulence and flame instability.