Propulsion System Flashcards

1
Q

State the 4 stroke engine cycle. (State process of each stroke and whether inlet & outlet is open/closed)

A
Intake:
Compression:
Inlet closed, Outlet closed
Piston moves
Combustion:
Exhaust:
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2
Q

Describe the Intake stroke of the 4 stroke engine cycle.

A

Inlet open, Outlet closed

Piston moves downwards to BDC, forms vacuum, causes the intake to enter

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3
Q

Describe the Compression stroke of the 4 stroke engine cycle.

A

Inlet closed, Outlet closed

Piston moves upwards to TDC (top dead centre)

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4
Q

Describe the Combustion stroke of the 4 stroke engine cycle.

A
Inlet closed, outlet closed
Fuel is injected into the chamber
Fuel, O2, heat required for combustion
All 3 conditions met, combustion occurs
Energy is released
Combustion causes piston to move and then moves the shaft
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5
Q

Describe the Exhaust stroke of the 4 stroke engine cycle.

A

Exhaust valve opens, remaining exhaust leaves through the exhaust pipe

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6
Q

State the purpose of engine block

A

To hold all the valve components of the engine

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7
Q

State the purpose of the engine shaft

A

to transmit energy from one rotating member to another supported by it or connected to it

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8
Q

State the purpose of the crank shaft

A

Converts linear motion to rotational motion

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9
Q

State the purpose of the connecting rod

A

connects piston to crankshaft, converts linear motion of the piston to rotational motion of the crankshaft

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10
Q

State the purpose of the piston and the piston ring

A

Piston: Converts heat energy into mechanical work/energy, key to carrying out 4-stroke diesel cycle
Piston ring: To keep the combustion chamber gas-tight

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10
Q

State the purpose of the piston and the piston ring

A

Piston: Converts heat energy into mechanical work/energy, key to carrying out 4-stroke diesel cycle
Piston ring: To keep the combustion chamber gas-tight

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11
Q

State the purpose of the cylinder head

A

holds the fuel injectors and valves(inlet outlet), seals the top of the cylinder block to form combustion chamber

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12
Q

State the purpose of the rocker arm

A

transmitting the movement of the camshaft towards the intake and exhaust valves of the engine

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13
Q

State the purpose of the camshaft

A

converts rotational motion to linear motion, controls opening and closing of inlet, outlet valves

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14
Q

State the purpose of the flywheel

A

to store rotational energy/maintains the initial momentum to keep the propeller moving

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