A Valveless Pulse Combustor With Wide Operation Range and Low Noise Level

[+] Author and Article Information
N. Ohiwa, S. Yamaguchi

Department of Mechanical Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, Japan

J. Energy Resour. Technol 111(3), 187-193 (Sep 01, 1989) (7 pages) doi:10.1115/1.3231422 History: Received June 01, 1988; Revised April 25, 1989; Online October 22, 2009


The possibility of a valveless pulse combustor with wide range and low noise level was experimentally examined by introducing two practical approaches simultaneously: one is the rich mixture supply outside the flammability limit, instead of the ordinary fuel supply without any primary air; the other is forced secondary air ventilation. An overall evaluation of pulsation limits was also made in terms of the volumetric efficiency of the pulse combustor. Fuel used was a commercial grade gaseous propane. The results showed that, under a constant total of equivalence ratios of 0.9, a large turn-down ratio of 9.4–11.5 and a high combustion intensity of 55–67MW/m3 could be obtained by setting the rich mixture equivalence ratio equal to 3.0. Also, the proposed valveless pulse combustor could operate more silently than the flapper-valved one by 3-8dB (A), being indicative of noise radiation due to valve flapping.

Copyright © 1989 by ASME
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