초록 ▼

A pneumatic computing device is disclosed for use with turbofan engines having mixer-type nozzles, in which both turbine and fan discharge pressures are tapped and pneumatically combined to derive a pressure equal to a weighted average thereof for application along with engine inlet pressure to a ra

A pneumatic computing device is disclosed for use with turbofan engines having mixer-type nozzles, in which both turbine and fan discharge pressures are tapped and pneumatically combined to derive a pressure equal to a weighted average thereof for application along with engine inlet pressure to a ratio-taking computing indicator instrument that registers an engine pressure ratio (EPR) from which the level of thrust developed by the engine can be accurately determined.

대표청구항 ▼

Apparatus for measuring net thrust of common nozzle mixed-exhaust turbofan jet engines and the like comprising: separate first and second input means respectively connected to sense engine fan discharge pressure and engine turbine discharge pressure upstream of an exhaust mixer and output means comb

Apparatus for measuring net thrust of common nozzle mixed-exhaust turbofan jet engines and the like comprising: separate first and second input means respectively connected to sense engine fan discharge pressure and engine turbine discharge pressure upstream of an exhaust mixer and output means combining sensed turbine discharge pressure with sensed fan discharge pressure to provide an output response representing a predetermined weighted average of said fan and turbine discharge pressures, and engine pressure ratio computing means having a first input connected to said output means to receive said output response and a second input connected to sense engine inlet pressure for computing the ratio between said output response and said engine inlet pressure and for providing an output signal representative of said ratio.