Numerical Assessment of Ramjet Intake Flow Topology Optimization for Off-Design Operation via Bypass Boundary Layer Bleed

摘要

Two dimensional numerical assessment of a ramjet intake at different operational conditions is conducted to characterize the flow field properties and the resultant performance parameters. The computational stuides are performed on Fluent fluid simulation package of ANSYS with a RANS model. The design condition for the provided ramjet geometry is stated to be at Mach 2.5 external flow speed while the off-design condition for the operational setup is set to be at Mach 2 external flow speed. A novel passive control scheme connecting the boundary layer control systems via a non-actuated by-pass channel is introduced and a conceptual preliminary implementation is tested with the promise of replacing conventional approaches of actively controlled systems to reduce the design complexity and vehicle weight. The numerical analysis performed over the off-design conditions with and without the implementation of the proposed bypass bleed system revealed increased flow uniformity and reduced total pressure loss throughout the compression procedure with the implementation of the proposed bypass bleed system. The ongoing research is set to further optimize the geometric specification in accordance to the characterized premise.