PISTON ENGINE PROPULSIONChapter 8

Thrust Augmentation

1933 Alvis Engine

2014HyundaiEngine

Power Boosting

CARB.AIR

FILTER

ENGINE

THE PARTIAL VACUUM TENDS TO WORK AGAINST THE PISTON MOVEMENT MAKING IT HARDER FOR THEM TO PULL AIR IN

INLET MANIFOLD

AND FLOW RESTRICTION THROUGH THROTTLE VALVE CAUSED BY SUCTION FROM ENGINE

BETWEEN THROTTLE VALVE AND ENGINE IS A PARTIAL VACUUM

EXHAUSTMANIFOLD

INLET MANIFOLD VACUUM

AND THEREFORE, THE CYLINDER MAY NOT BE FULLY CHARGED 100% WITH AIR/FUEL MIXTURE

IF AIR COULD BE FORCED INTO THE ENGINE, THERE WOULD BE A GREATER VOLUME OF AIR/FUEL IN THE CYLINDER

THEREFORE MORE POWER WOULD BE PRODUCED

SO HOW COULD THIS BE ACHIEVED?

BY USING AN AIR COMPRESSOR

LET’S SEE HOWLET’S SEE HOW

Fuel Control

Engine

AirFilter

AIR COMPRESSOR

CUT IN HALF AND LOOK AT CROSS SECTION

CROSS SECTION

ROTORROTOR

ROTOR VANES

STATOR VANES

OUTLET DUCT

TAKE LID OFF AND LOOK INSIDE

AIR COMPRESSOR

TYPICAL ROTOR

AIR ENTERS THE ‘EYE’ OF THE ROTOR

AIR COMPRESSOR

AIR COMPRESSORSUPERCHARGER – DRIVEN BY THE ENGINE

GEAR OR BELT DRIVE

COMPRESSED AIR TO ENGINE

TURBOCHARGER – DRIVEN BY THE ENGINE EXHAUST GASES

EXHAUST GASES FROM ENGINE

THROUGH EXHAUST PIPE

TURBINE BLADES

Any questions?