Study on Geometric Modeling of Flow Field and Flame Structure of a Lean Premixed Multi-nozzle Combustor
Modern gas turbine combustor adopts lean premixed multi-nozzle combustion technology to re-duce emission.Appropriate geometric modeling method can reduce the cost of the test and make the test results.similar to the prototype.In order to study the geometric modeling method for multi-nozzle combus-tor,the similarities of the non-reactive flow field and flame structures of the benchmark multi-nozzle com-bustor and a scale model combustor with scaling factor of 0.71 are compared under the criteria of equal Damkohler number EDa,equal velocity EV and equal Reynolds number ERe..In this paper,particle im-age velocimetry(PIV)test and numerical calculation method are used to obtain the flow field structure of multi-nozzle combustor,and CH-based chemiluminescence method is used to measure the flame struc-ture.The results show that the similarity level of ERe criterion in the modeling of both the non-reactive and reactive flow field is the best;compared to the intermediate nozzle recirculation zone and inner and outer jet interference zone,the modeling result of ERe criterion for the outer nozzle recirculation zone has the best similarity level;as the flow field develops downstream,the modeling results of non-reactive state are more similar to the benchmark model,while the conclusion is opposite for reactive state,which has a higher similarity in upstream flow field;in terms of flame structure modeling,the EDa criterion is the most similar to modeling of the flame length at inner and outer jet interference zone,while the EV criteri-on is the most similar to modeling of the core position of flame heat release rate.
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