【摘要】 在传统的亥姆霍茨型脉动燃烧器基础上,取消了机械阀,采用连续供气方式,建立了弯尾管亥姆霍茨型无阀自激脉动燃烧器实验系统,设计了0°、45°,90°和135°弯尾管结构形式,实验研究了弯尾管亥姆霍茨型无阀自激脉动燃烧器尾管的传热特性。结果表明:在相同频率下脉动燃烧器传热系数随压力振幅的增大而增大,脉动流的传热系数约为相同雷诺数下稳态流传热系数的2.4-4.6倍;在相同压力振幅下脉动燃烧器传热系数随脉动频率的增大而增大,脉动流传热系数约是相同雷诺数下稳态流传热系数的3.3-4.7倍。更多还原

【Abstract】 A test system for bent tailpipe Helmholtz type valveless self-excited pulsation burners was set up on the basis of the traditional Helmholtz type pulsation burners with the mechanical valves being removed and a continuous air and fuel supply being adopted.Bent tailpipes including 0°,45°,90° and 135° were designed.The heat transfer characteristics of the pulsation burner were investigated.The research results show that the heat transfer coefficient of the tailpipe increases with an increase of the pressure variation range at a same frequency and the heat transfer coefficient is about 2.4 to 4.6 times higher than that of a steady-state flow at a same Reynolds number.The heat transfer coefficient of the burner increases with an increase of the pulsation frequency in a same pressure variation range,and the heat transfer coefficient is about 3.3 to 4.7 times higher than that of a steady-state flow at a same Reynolds number.更多还原