Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
50 Cards in this Set
- Front
- Back
|
Isentropic |
No heat transferred to or from compressing/expanding gases |
|
|
Isothermal |
A change in a system where the temperature stays constant |
|
|
Polyropic |
Anywhere between Isentropic and isothermal |
|
|
Net work |
Total work delivered by the piston to crankshaft on power stroke |
|
|
Indicated power |
This is the jet engine power developed by the cylinders. Measured in watts or hp |
|
|
Isochronous |
The frequency of electricity generated is flat or constant and there is zero generator droop |
|
|
Brake power |
BP is the actual power output of the engine as would be measured by a dynamometer. BP is measured in watts or BHP |
|
|
Mechanical efficiency |
The difference between IP and BP is the power required to overcome friction. The ratio of BP to IP is called mech eff |
|
|
Mean Indicated Pressure |
The average cylinder pressure during an entire cycle |
|
|
Mean effective pressure |
The average cylinder pressure during an entire cycle but based on BHp |
|
|
Turbochargers |
It allows more air to be packed into engine cylinders thereby increasing volumetric efficiency |
|
|
Blowers and superchargers |
A mechanical air pump used to force low pressure air into engine cylinders |
|
|
Scavenging |
The process of forcing air into the cylinder and pushing the exhaust gases out of the cylinder |
|
|
Theoretical Air |
No excess air for combustion |
|
|
% theoretical air |
Comparing book value to what is burning |
|
|
Kinetic energy |
The energy a system possesses as a result of its relative motion to some reference frame |
|
|
Potential energy |
The energy that a system possesses as a result of its elevation |
|
|
Specific Heat |
The amount of heat to raise 1 unit of mass 1 increment of temperature |
|
|
Basic governor system |
Speed sensor, govener, and actuator |
|
|
Types of governor |
Mechanical Pneumatic Electrical Hydraulic |
|
|
Engine block |
Main structural component of the engine and the foundations for the other components to be mounted |
|
|
Engine block |
Main structural component of the engine and the foundations for the other components to be mounted |
|
|
Crankshafts |
To change the reciprocating motion of the Pistons into rotary motion that can be used to drive the gearbox, generators and pumps |
|
|
Connecting rod |
To transfer the motion of the piston to the crankshaft |
|
|
Connecting rod |
To transfer the motion of the piston to the crankshaft |
|
|
Camshaft |
Used to operate the opening and closing of valves |
|
|
Turbochargers |
To allow more air to be packed into engine cylinders |
|
|
Supercharging |
A mechanical air pump used to force low pressure air into engine cylinders |
|
|
Swirl |
The direction of air movement is circular resulting in a perpendicular relative motion between air and fuel |
|
|
Swirl |
The direction of air movement is circular resulting in a perpendicular relative motion between air and fuel |
|
|
Squish |
The piston is shaped in such a way that is promotes circular movement of the air. As it gets to TDC he air goes radially and vertically |
|
|
Full load |
The distance from the plunger head to the helix is a maximum so that maximum amount is injections |
|
|
Idling |
Minimum |
|
|
Stopped |
The plunger is rotated to such a position that the vertical groove is always in contact with the spill port |
|
|
Intercooler |
A mechanical device used to cool air |
|
|
Intercooler |
A mechanical device used to cool air |
|
|
Cutoff ration |
Volume above the piston when fuel stops spraying over the clearance volume. |
|
|
POI |
The point in the fuel enters the cylinder |
|
|
POI |
The point in the fuel enters the cylinder |
|
|
High SIT |
A high sit will require a higher air temp to have been achieve in order to allow combustion to commence. Longer compression time and longer delay |
|
|
Self ignition temperature |
A low sit will allow the fuel to burn earlier in the compression cycle thereby giving a shorter delay period |
|
|
Injection lag |
Fuel does not enter the cylinder the instant the plunger operates in he fuel pump. Due to compressibility, elasticity and length of the fuel lones |
|
|
Speed sensor |
A device to measure speed of the engine |
|
|
Speed sensor |
A device to measure speed of the engine |
|
|
Governor |
A device to compare the desired or set speed with the measured speed and pass a control or actuator sognal |
|
|
Speed sensor |
A device to measure speed of the engine |
|
|
Governor |
A device to compare the desired or set speed with the measured speed and pass a control or actuator sognal |
|
|
The actuator |
A device that accepts the output signal from the governor and provides a force that moves the fuel pump rack |
|
|
Aftercooler |
Small radiators placed between the compressor housing and the intake manifold of the engine |
|
|
Injection pump components |
Barrel, plunger, delivery valve, slotted control sleeve, plunger spring, toothed control quadrant |
