Helmoholtz型无阀自激脉动燃烧器去耦室的研究

The Research of Decoupling Chamber Valveless Self-excited Pulse Combustor of the Helmoholtz Type

文中通过实验研究了0°、45°及90°弯尾管Helmoholtz型无阀自激脉动燃烧器的压力特性、频率特性以及尾管传热系数受去耦室压力变化的影响。研究结果表明，当去耦室压力在-3～-2kPa时，直尾管Helmoholtz型无阀自激脉动燃烧器具有更好的运行特性；当去耦室压力在-6～-5kPa时，45。弯尾管Helmoholtz型无阀自激脉动燃烧器具有更好的运行特性；90°弯尾管Helmoholtz型无阀自激脉动燃烧器由于压力振幅变化大、经常出现双频现象，降低了脉动燃烧系统的稳定性，所以文中建议实际中不宜采取90°弯尾管进行工程设计应用。

The experimental study is used to research the valveless self-excited pulse combustor of the Helmoholtz type with 0°, 45° and 90° curved tailpipe and some factors, such as pressure characteristics, frequency characteristics and tailpipe heat transfer coefficient, which influence on decoupling chamber pressure. The results show that when the pressure of decoupling chamber is - 3 kPa ° - 2 kPa, the valveless self-excited pulse combustor of the Helmoholtz type with straight tailpipe has better operating characteristics; when the pressure of decoupling chamber is -6 - -5 kPa, the valveless self-excited pulse combustor of the Helmoholtz type with 45° curved tailpipe has better operating characteristics. Because of the instability of the valveless self-excited pulse combustor of the Helmoholtz type with 90°curved tailpipe, it is not reasonable to use it for engineering design.