Based on the engine overall performance ground test and parameter analysis in case of nozzle deflection under different working conditions

the effect of nozzle deflection on engine thrust loss

deflection efficiency and engine working characteristics were obtained. The experimental results showed that the engine thrust loss increased and deflection efficiency increased at first and then decreased with the increase of geometric vector angle when compressor speed remained unchanged. The engine thrust loss increased at first and then decreased

and the deflection efficiency increased with the increase of rotor speed when geometric vector angle remained unchanged

but the deflection efficiency was always less than 1. Engine speed difference increased with the increase of geometric vector angle when engine worked in throttle rating and speed difference almost kept constant with the increase of geometric vector angle when engine worked in middle rating. Fan co-operating line moved upward and fan surge margin decreased in case of nozzle deflection. So the method of expanding stability should be adopted for the engineering application of vectoring nozzles.