METHOD FOR CONDUCTING STAND-ALONE TESTS ON MIXED FLOW AFTERBURNERS OF BYPASS TURBOFAN ENGINES Russian patent published in 2011 - IPC G01M15/14 

FIELD: physics.

SUBSTANCE: when conducting stand-alone tests in an afterburner, the value of total pressure of streams in air ducts of internal and external loops, on the section of the mixture, at the outlet of the diffuser and in front of the nozzle of the afterburner is measured. Air at the same low temperature is fed to the input of the air ducts of the internal and external loops. Further, by changing the area of the nozzle, a mode for critical flow of the stream from the nozzle is achieved. The value of total pressure of the stream at the inlet and outlet of the analysed section of the flow channel (mixer, diffuser, flame stabilisers) and the chamber as a whole is measured. The inlet irregularity characteristic is the ratio of total pressure of the streams in the loops. Conversion of results on looses to real conditions of operation of the engine is carried out using given relationships.

EFFECT: shorter time and low cost of gas-dynamic actual and model tests on afterburners of bypass turbofan engines and providing a reliable method for accounting for the effect of input temperature irregularity of streams in loops of the afterburner on hydraulic looses in its elements.

3 cl, 2 dwg