Study on Operating Characteristics of a Valveless Self-excited Pulsating Burner Fuelled by Natural Gas
The design of a valveless self-excited pulsating combustor that eliminates the need for a con-ventional mechanical valve was presented in this paper.The tail pipe was designed in a serpentine struc-ture,and using natural gas as the fuel,the autonomously excited pulsating combustion was achieved by continuously supplying air and natural gas.An experimental investigation was conducted to examine the operational properties of the pulsating combustor.The impact of heat load and excess air factor on pres-sure oscillation and operating frequency was analyzed.The findings indicate that the burner is capable of generating consistent pulsating combustion within a specific range of excess air factor from 0.9 to 1.4.The pressure amplitude and operating frequency both rise as the thermal load increases.Additionally,the pressure amplitude increases,while the operating frequency decreases as the excess air factor increases.Moreover,the burner exhibits a frequency jump phenomenon when the thermal load is reduced during sta-ble operation.
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