Taking the constant slope internal cone flow as the basic flowfield

a program was constructed to design and quickly analyze the external compression segment performance of inward turning inlet (ITI). Then taking the rectangular capture shape for example

the effects of three outline and position determinant parameters

including center distance

rotation angle and aspect ratio

on the external compression segment's geometry and aerodynamic characteristic were studied. At last

external compression segments with different flow capture shapes (FCS) (rectangular

rounded rectangular and circular) were compared. The results show that the average radius of flow capture shape can be used as an important geometric parameter to evaluate the total pressure recovery; as the average radius increases

the total pressure recovery goes higher. For rectangular capture shape

as the center distance increases

the length and arc length of external compression segment along with the wetted surface area increase monotonically

the external contraction ratio decreases monotonically

while the effect of the rotation angle and aspect ratio on the external compression segment is relatively complicated. Besides

among the three parameters

the center distance is the most sensitive parameter for total pressure recovery. In addition

if the center distance and capture area keep invariant

the fillet radius has little effect on the geometry and performance parameters of the external compression segment.