PISTON ENGINES

SUBMITTED BY: DANIEL ARMSTRONG SREG NO: 11912100713RD YEAR AEROSPACE B

EXPERIMENT 6CASE STUDY OF PISTON ENGINE(Rolls-Royce RB.80 Conway)

AIMTo do a case study on a piston engine and the aircraft it is employed in.

THEORYA piston engine uses the power generated by combusting fuel in a piston-cylinder to rotate a crankshaft, which rotates the propellers to generate the required thrust.

Piston engines are classified based on their cylinder arrangement into

In-Line Piston Engine Radial Piston Engine V Piston Engine W Piston Engine

INTRODUCTIONTheRolls-Royce RB.80 Conwaywas the firstby-pass engine(or turbofan) in the world to enter service.The Conway powered versions of theHandley Page Victor,Vickers VC10,Boeing 707-420and Douglas DC-8-40.

SPECIFICATIONS

GENERAL CHARACTERISTICS

Type:Turbofan Length:134.21in (3,409mm) Diameter:37.6in (960mm) Dry weight:4,500lb (2,000kg) Compressor:Axial flow; 7-stage LP, 9-stage HP Combustors:Cannular Turbine:axial flow; 1-stage HP, 2-stage LP Performance Maximumthrust:17,150 lb (76.3 kN) Bypass ratio:0.25 Specific fuel consumption:0.87

PERFORMANCE

POWER OUTPUT: 1567 kW SPECIFIC POWER: 34.1 kW/L POWER-TO-WEIGHT RATIO: 1.46 kW/kg

DESIGN

The RCo.12 Conway is an axial-flow turbofan with a low bypass ratio of about 25%. It had a seven-stage low-pressure compressor, the first six stages made of aluminium and the last of titanium. Behind this is the nine-stage high-pressure compressor, the first seven stages of titanium and the last two of steel. The bypass housing duct was also made of titanium. The combustion area consisted of ten cannularflame cans. The high-pressure compressor was driven by a single-stage turbine using hollow air-cooled blades, which was followed by the two-stage turbine powering the low-pressure compressor.

Accessories were arranged around the front of the engine, leading to a minimum of increased diameter. The engine produced 17,150 pounds-force (76,300N) for takeoff, weighed 4,500 pounds (2,000kg) and had aspecific fuel consumptionof 0.712 at take-off thrust and 0.87 for cruise. By 1968 aHyfilcarbon-fibrefan assembly was in service on Conways of the VC10s operated byBOAC. The final development of the Conway series was theRCo.42, designed specifically for theVickers VC10.

CONWAY ENGINE

RAF Victor with Conway engine

FormerQantas707-138B owned byJohn Travoltaat the 2007Paris Air show with a Conway Engine.

RESULT:Thus the Piston Engine (i.e.) RR Conwayand its applications are studied.