Study on the influence of outlet diameter on the out-field pressure action characteristics of pulse detonation cleaning device
Pulse detonation cleaning technology is an efficient cleaning technology that is used inert shock waves generated by decoupling the detonation to remove ash and deposits.And it has great advantages in the field of fur-nace cleaning.In order to investigate the pressure distribution characteristics outside the detonation cleaning device and to explore the effect of the device outlet diameter on the pressure distribution characteristics,numerical simula-tions and experimental studies of pulse detonation cleaning device with using propane-air as the fuel has been car-ried out.The numerical simulation and experimental study on pulse detonation cleaning device by using propane-air as the fuel has been carried out.The results show that:as the propagation distance increases,there is a trend for the out-field arc shaped shock wave to transform into plane wave,and the applied pressure tends to be similar from the axis outward,and the time it acts on the ash accumulation surface also tends to be similar.When the external shock wave acts on the ash accumulation surface of the non-convective tube bundle,except for the positive reflec-tion at the axial opposite position,which generates one pressure peak,the other positions mainly generate two pres-sure peaks due to oblique reflection.The ratio(diameter ratio)between the diameter of the tail outlet and the diam-eter of the detonation chamber is 1,the pressure peak of inert shock wave in the out-field is the largest.Increasing or decreasing the out diameter of the tail will weaken the action of the inert shock to different degrees.For diameter ratio smaller than 1,the pressure peak of the inert shock increases with increasing diameter ratio,while for diame-ter ratios larger than 1,decreases with increasing diameter ratio.
boiler ash and depositsdetonation cleaningshock waveaction characteristicsfill fractiondiameter ratio
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