Numerical Study on Flow Resistance Characteristics of Flame Holder in an Afterburner
To reduce wastage of engine thrust and fuel caused by the afterburner flow resistance loss,the influence of the structural parameter change of flame holders of cavity and strut on the flow field structure and flow resistance loss was studied by a numerical calculation method which had been verified by experi-mental data.The effect of the structural parameters of the flame holder on the reflux rate and total pres-sure recovery coefficient was analyzed.The Mach number at the inlet of the proposed afterburner was 0.385.The inclined angle range of the cavity flame holder was 40° to 90° with a depth of 37 to 77 mm.The width range of the strut flame holder was 29 to 41 mm with a trailing edge expansion angle of 0 to 15°.The results show the cavity depth influences the flow field more significantly rather than cavity in-clined angle.And the total pressure recovery coefficient increases when the cavity depth decreases.With the decreasing of strut width,the recirculation zone in the afterburner shrinks,while the total pressure re-covery coefficient increases monotonously.Compared with the central cone recirculation zone,the recir-culation zones at the tailing edge of the strut and behind the cavity have greater impact on the flow resist-ance loss with stronger vortex intensity.The recirculation zone at the tailing edge of strut grows and the integrated recirculation zone in cavity and central cone shrinks gradually caused by compression,with the incremental strut flame holder trailing edge expansion angle,which leads to the maximum total pressure recovery coefficient at expansion angle of about 3.5°.
NETL
NSTL
万方数据
