Research On The Influence Of Light Transmittance To The Downstream Flow Field Of Swirler

Nowadays, aircraft engine combustor always uses swirler to form low velocity zone, whichwill make the flame stable and promote oil and gas mixture. The swirlers’ types are different andvarious. However, its structure and flow characteristics are basically the same. The downstreamflow field of swirler will change when the structure parameters of swirler changes. A research onthe influence of structure parameters of swirler to the downstream flow field of swirler will helppeople know more about the swirler and its downstream flow field, which will also providetheoretical basis for the design of swirler, and the air flow structure and atomization characteristicsin the combustor header will improve. Finally, the combustor’s temperature rise will inprove, therange of stable working bound will broaden, which will fulfil the design of combustor header withhigh temperature rise and heat load.The structure parameters of any swirler are numerous and some parameters influence eachother, which is not conducive to the research on the influence of different structure parameters tothe downstream flow field of swirler. To fully study the influence of different structure parametersto the downstream flow field of swirler, this paper introduced a comprehensive parameter calledLight Transmittance δ which is related to all the structure parameters. Based on this, the authordesignd some typical swirlers with different Light Transmittance. Besides, the author did somenumerical simulation study and PIV experiment on the downstream flow field of swirlers withdifferent Light Transmittance. Finally, the author summed up the influence of different lighttransmittance and different flow rate to the downstream flow field of swirler, also found out thesame and different point of the downstream flow field of swirlers with same light transmittance.We found that, when the blade angle changes, the recirculation zone becomes smaller at first andthen increases, the Total Pressure Loss changes much, and becomes bigger with the decrease ofthe Light Transmittance. When the number of blade changes, the recirculation zone becomesbigger at first and then decreases, the Total Pressure Loss changes little, but becomes bigger withthe decrease of the Light Transmittance. When the breadth of the swirler changes, the recirculationzone becomes smaller at first and then increases, the Total Pressure Loss changes little, butbecomes bigger with the decrease of the Light Transmittance. When the Light Transmittance notchanges, there are many similarities and differences in the flow field. The results of this studyshow that light transmittance is an important factor that affects the flow field characteristics ofswirler, it can be used as a parameter to analysis the flow field characteristics of swirler. At the same time, we found that the flow field characteristics of swirlers with same light transmittanceare not exactly the same, which show that in addition to the Light Transmittance, there are otherfactors coupled together influence the flow field characteristics of swirler.