Analyzing the parent flowfield of inward turning inlet combined with variable-geometry

The novel flow pattern type of high-external compression inrernal conical of C+(ICFC+) integrated with variable-geometry internal waverider inlet (IWI) is investigated in this paper. Such novel ICFC+ improves the performance by reducing the expansion regions, which is realized by controlling the characteristic lines of local airflow. Based on six different chosen functions of compression behaviors, the line-function is the best way to remarkably improve the performance of flow pattern with nearly uniform flow after the reflected shock. Then a single-degree-of-freedom configuration of variable-geometry IWI has been proposed in this paper, the simulation results of the design Mach number (M4) indicates that the osculating axisymmetric theory concept of IWI can be adopted to design 3D, complicated shape to capture almost all the air flow. Furthermore, at lower Mach numbers, variable-geometry IWI still can capture nearly all of mass flow with Φ = 0.98: none of other inlets have been reported globally with such rather high-performance characteristic of mass flow capture at lower Mach numbers. Moreover, the main flow structures nearly remain the same to those at M4.0, especially at M3.5 and M3.0: while at M-.5 and M2.3, the conical shock changes obviously due to insufficiently sidewall compression.