MODELING OF JET-GENERATED RECIRCULATING FLOWS IN A MINIATURE COMBUSTOR

The complicated flow fields in miniature annular combustors are investigated numerically. The flow parameters studied include the jet tube length and momentum ratio of the primary jet. From the numerical results it is found that four different recirculations, namely, the primary, second, third, and dilution recirculations, might be generated in the combustor owing to the interaction between the mainstream and the lateral jets. In all cases studied, the primary recirculation can be observed, although its strength, size, and location are changed with the flow parameters. The jet tube length produces a significant effect on the recirculation flow structure in the primary zone. The increase of the momentum ratio of the primary jet results in the suppression and enhancement of the primary and second recirculations, respectively.