METHOD OF MEASURING FLIGHT THRUST OF HYPERSONIC RAMJET ENGINE OF UNMANNED HYPERSONIC FLYING LABORATORY Russian patent published in 2004 - IPC

FIELD: aircraft engine manufacturing.

SUBSTANCE: invention relates to hypersonic ramjet engine and method of determination of their thrust-service performance basing on results of flight tests. Vehicle in flight is exposed to simultaneous action of aerodynamic force, gravitational force and thrust. To determine thrust said forces should be separated. For this purpose fuel delivery to combustion chamber is cut off and cut in for short time periods not exceeding one second. Then difference in accelerations (Δn_x·g) during said time intervals specifies acceleration under action of engine thrust in flight. To improve accuracy, testing can be repeated 2-3 times and average acceleration value ω_R can be taken by which engine thrust in flight is determined by relationship Re_tl=Mfl·ω_R where Re_tl is engine thrust at t_l, Mfl is mass of flying laboratory; ω_R is acceleration of flying laboratory under action of engine thrust. Invention makes it possible to optimize accuracy of measurement of thrust in flight at minimum changes of flight control program. Proposed method can be used for unmanned hypersonic flying laboratories with ramjet engines.

EFFECT: improved reliability of tests.

2 cl, 6 dwg