ALTITUDE TEST BENCH FOR DOUBLE-FLOW JET TURBINE ENGINES, AND ITS OPERATING METHOD (VERSIONS) Russian patent published in 2012 - IPC G01M15/14 

FIELD: test equipment.

SUBSTANCE: invention refers to testing of jet turbine engines using the test bench under conditions close to flight conditions. Altitude test bench for double-flow jet turbine engines includes thermostatic and exhausting plants, and thermal vacuum chamber with the engine to be tested, which is arranged inside it. Engine is installed on fixed posts of dynamometric platform. Air path of the tested engine is interconnected with thermal vacuum chamber inlet through controlled throttles. The cavity inside thermal vacuum chamber is separated with a partition installed in engine exhaust zone and equipped with bypass valves. Thermal vacuum chamber is equipped with supply pipelines from high-altitude line with external throttles. Throttles are connected to receiver rigidly fixed on dynamometric platform. Receiver outlet is connected to the tested engine inlet through lemniscate head piece and flow metering manifold. Engine nozzle is installed with a radial gap and low axial crossover inside exhaust pipeline with an ejecting head piece. The above head piece is fixed on a partition wall. Pipeline connected to the receiver is provided with external bypass throttle to supply the delivery air from thermal vacuum chamber inside the receiver. The other object of this invention is operating method of the above described bench, which consists in the fact that air from thermostatic and exhausting plant is supplied to pipeline from high-altitude line; low pressure pipeline is shut-off to minimum required air flow rate; receiver bypass throttle is closed; at that, air is supplied through an elbow to receiver, then through lemniscate head piece, flow metering manifold to the tested engine inlet; the gas entering the compartment is pumped off with the exhausting plant. The other bench operating method consists in the fact that air is supplied from thermostatic and exhausting plant to low pressure pipeline; high pressure pipeline is shut-off, and the pipeline is fully opened so that the air can enter the inlet compartment; bypass throttle from receiver is opened and air is supplied through lemniscate head piece, flow metering manifold, engine, exhaust pipeline with further pumping of air from outlet compartment by means of exhausting plant.

EFFECT: invention allows improving thrust measurement accuracy.

3 cl, 1 dwg