Frequency and Pressure Characteristics of a Helmholtz-Type Valveless Self-Excited Pulse Combustor

Abstract:

The frequency and pressure characteristics of a Helmholtz-type valveless self-excited pulse combustor with continuous supply of fuel and air are investigated in this paper. A theoretical model of combustion is established. In the model, combustion is assumed to take place in a thin flame sheet separating the two zones, and the effects of the continuous gas-supply mode and heat transfer of the tailpipe on the operating characteristics are considered. From the mathematical model, the expressions of frequency and maximum pressure amplitude for the pulse combustor are derived. The results suggest that the frequency decreases with the increase of excess air ratio and tailpipe length, and increases with the heat load. The pressure amplitude increases with the increase of the excess air ratio and heat load, and slightly declines with the increase of the tailpipe length. The experimental data show qualitative agreement with the calculated results.

• Periodical: Advanced Materials Research (Volumes 455-456)
• Pages: 161-167
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.455-456.161
• Online since: January 2012
• Authors: Yan Ying Xu, Ming Zhai, Peng Dong, Fei Wang, San Long Peng, Qun Yi Zhu
• Keywords: Frequency Characteristic, Helmholtz-Type Valveless Self-Excited Pulse Combustor, Pressure Characteristics, Pulse Combustion, Theoretical Model

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