An investigation of the influence of sound on flow stability, flame noise and nitrogen oxide levels in natural gas flames
Abstract
An experimental study was conducted to determine the influence of applied sound on flow stability, flame noise, and nitrogen oxides in premixed natural gas flames. Flow stability of diffusion flames was also investigated. Applied sound fields were investigated for the range of 8 to 32,500 Hz and sound levels up to 100 db. Sound fields applied upstream of the burner nozzle were effective in disturbing the flame whereas sound fields external to the burner flame system were ineffective. An analytical model for flame amplification of upstream noise was developed. It is concluded that sound fields applied upstream of the flame influence flow stability, flame noise, and nitrogen oxides. Noise originating upstream of the flame may control flame noise in many low-noise burner applications. Noise fields can also vary nitrogen oxide production up to 30 percent. Noise at frequencies that do not induce mixing in the flame can increase nitrogen oxides up to 20 percent.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- 1975
- Bibcode:
- 1975PhDT........41K
- Keywords:
-
- Diffusion Flames;
- Flame Stability;
- Nitrogen Oxides;
- Noise (Sound);
- Natural Gas;
- Premixed Flames;
- Fluid Mechanics and Heat Transfer