Fig. 1. Diagram of experimental system structure

Fig. 2. Indoor doom

Fig. 3. Structure diagram of experiment bench and optical metrology system

Fig. 4. Diagram of observations at near, far end of nozzle

Fig. 5. Simulation results of flow structure in nozzle section and observation section

Fig. 6. Stability test results of flow field structure

Fig. 7. Image of target-star 1 at position 1

Fig. 8. Displacement and star-light deflection of target-star 1 at near-end of nozzle

Fig. 9. Displacement and star-light deflection of target-star 2 at far-end of nozzle

Fig. 10. Displacements and fitting residuals for star-light deflection of star-points at different observation points of far, near-end of nozzle