An Improved Internal-Waverider-Inlet with High External-Compression for Ramjet Engine

摘要

A new type of Internal-Waverider-Inlet(IWR inlet) for Ramjet Engine is presented in this paper. It is based on the new High External-Compression basic flowfield called Internal Conical Flow C+ (ICFC+). Such new IWR inlet can improve the starting ability at lower Mach numbers than the previous design. The designing methodology of IWR inlet is presented. Analysis of such design shows that the basic flowfield is the key part in designing progress. A new method of generating characteristic lines is developed to evaluate the compressing efficiency of variable two dimensional flowfields. With the assistance of this method, the new High External-Compression basic flowfield ICFC+ is generated. One inlet was designed by using the ICFC and another inlet with same contraction ratio then was designed by using ICFC+. The numerical simulation results show that both inlets are capable of keeping their shock structures and other main flow characteristics exactly as their derived flowfield, thus resulting in capturing almost all upstream flow. But ICFC+ based inlet has better aerodynamic performance on low Mach number condition. Further, the higher compression ability led to shorter length of ICFC+ based inlet, which is helpful to inlet-engine integration design.