Research on Simulation and Performance Optimization of Mach 4 Civil Aircraft Propulsion Concept

Table 4

Relative position symbol of measuring point and nozzle.

Variable	Significance
	Length between nozzle and measuring point
, theta	Pole direction angle (angle between engine axis and line connecting measuring point and nozzle)
, psi	Modified pole direction angle ()
, alpha	Engine angle of attack (angle between engine axis and flight direction)