筒形五喷嘴燃烧室冷态时均流场特性实验研究

In order to investigate the flow field characteristics of a five-nozzle combustor，the high-frequency PIV experiment was carried out to study the characteristics of the cold flow fields on the central plane of the combustor. Results were mainly focused on the impacts of inlet velocity and central nozzle swirl intensity on time-averaged flow field characteristics of central plane of the five-nozzle combustor. Experimental results indicate the main recirculation zones exist at the outlet of central and outer nozzles，and the corner recirculation zones exist between the outer nozzle and combustor wall. Adjacent swirling flows interact mutually. When swirl intensities of the five nozzles are the same，the shape and length of the main recirculation zones of the central and outer nozzles，the location of maximum reverse velocity and mixing point stay basically unchanged with the inlet velocity increasing from 10 m/s to 20 m/s. When the inlet velocity is 14.3 m/s ，the swirl intensity of the central nozzle increases from 0.63 to 0.84，the length of the main recirculation zone of the central nozzle increases，however，the length of the recirculation zone of the outer nozzle remains unchanged. The maximum reverse velocity of the main recirculation zone increases significantly，and the axial position of the maximum reverse velocity moves upstream to the nozzle outlet. The radial position of the mixing point is basically unchanged，and its axial position moves upstream closer to the nozzle outlet.