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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。
Based on the traditional Helmholtz pulsation burner, a mechanical valve was eliminated and a continuous air supply system was adopted to establish the experimental system of Helmholtz valveless self-excited pulsation burner. The design of 0 °, 45 °, 90 ° and 135 ° tail pipe structure. The heat transfer characteristics of the tail pipe of Helmholtz valveless self-excited pulsating combustor were experimentally studied. The results show that the heat transfer coefficient of pulsating combustor increases with the increase of pressure amplitude at the same frequency, and the heat transfer coefficient of pulsatile flow is about 2.4-4.6 times of the steady-state heat transfer coefficient under the same Reynolds number. Under the same pressure amplitude The heat transfer coefficient of the pulsating pulsator increases with increasing pulsation frequency, and the pulsating flow heat transfer coefficient is about 3.3-4.7 times of the steady-state heat transfer coefficient under the same Reynolds number.