值班稳定器燃烧室值班火焰的火焰传递函数研究

In order to investigate the dynamic characteristic of pilot flame, the flame transfer function of pilot flame in a model pilot bluff body stabilized combustor has been investigated experimentally. Dynamic pressures are measured by dynamic pressure transducers. The global unsteady heat release is measured by photomultiplier with CH ^* bandpass filter. Dynamic pressure transducers and photomultiplier can achieve synchronize acquisition. The flame dynamic processes are captured by high speed camera. The flame transfer function of pilot flame has been determined from global unsteady heat release and velocity oscillation. The velocity oscillation can be calculated from pressure oscillation using two-microphones technique. The experimental results indicate that the pilot flame is unstable when the pilot fuel flow rate is 0.552g/s, 0.621g/s and 0.69g/s, the time lag is 0.0116s, 0.00675s and 0.0133s respectively.