How do you plot an indicator diagram?

How do you plot an indicator diagram?

Indicator diagram or Power Card

1. Attach the cord to the indicator drive.
2. Open the indicator valve.
3. Press the stylus against the paper.
4. Release the stylus, when the drum has turned two or three times.
5. Close the indicator valve.

What is important of indicator diagram?

Indicator diagrams are used to assess the performance of each unit of the ship’s main engine. It is based on the indicator diagram that the overall performance of the engine is assessed. If there is any difference, it is important that the problem is rectified before starting the engine.

What is an engine indicator?

An engine indicator is an instrument for graphically recording the pressure versus piston displacement through an engine stroke cycle. Engineers use the resulting diagram to check the design and performance of the engine. A mechanical indicator consists of a piston, spring, stylus, and recording system.

What can be obtained from engine indicator diagram?

Engine indicators are instruments which record the pressure and volume of the gases within the engine cylinder on a diagram, and make possible a study of the entire cycle with alterations or modifications to the air/fuel ratio, ignition timing, speed and load characteristics being recorded.

What is PMAX and Pcom?

Pcom – Compression Pressure. Pmax – Maximum Pressure. There are 4 types of indicator diagrams that can be taken from the engine cylinder to know the condition and performance of the engine. Power card / Power indicator diagram.

Why is draw card taken out of phase?

ii) Draw card (90 degrees out of phase)– Similar to power card but taken with the indicator drum rotation 90 degrees out of phase, with fuel on. To evaluate fuel injection process, ignition delay, fuel quality, combustion, loss of compression, expansion process, fuel pup timing, and after-burning.

How many types of indicator diagrams are there?

There are four types of indicator diagrams: Power card. Draw card. Compression diagram. Light spring diagram.

What is an indicator diagram give an example?

An indicator diagram is a map of cylinder pressure plotted against stroke or degrees of rotation for the power stroke or complete cycle of an engine. The fuel/air ratio of the charge influences the rate of combustion and has an effect on indicator diagrams.

What is draw card diagram?

Draw Card / Out of Phase Diagram Draw card is taken in a similar manner to power card with fuel pump engaged but with the indicator drum 90 degree out of phase with the piston stroke. This diagram illustrates more clearly the pressure changes during fuel combustion.

What is 2 stroke IC engine?

A two-stroke (or two-stroke cycle) engine is a type of internal combustion engine that completes a power cycle with two strokes (up and down movements) of the piston during one power cycle, this power cycle being completed in one revolution of the crankshaft.

What is Pmax in main engine?

2.4.7 Maximum cylinder pressure (Pmax) When the combustion starts, the pressure and temperature are increasing in the cylinder, the highest pressure the combustion reaches is then the Pmax.

What is Pcom in engine?

Pcom – Compression Pressure. Pmax – Maximum Pressure. There are 4 types of indicator diagrams that can be taken from the engine cylinder to know the condition and performance of the engine. Power card / Power indicator diagram. Compression diagram.

What is an indicator diagram for an engine?

The indicator diagram (pv diagram or power card or work diagram), illustrates the pressure variations in the engine cylinder as a function of the main piston position. The diagram area can be integrated by means of a planimeter, and the mean indicated pressure calculated.

How is indicated power measured in an IC engine?

The Indicated Power is defined as the power produced due to combustion of fuel within the cylinder in an IC Engine. It is essentially the sum of the Friction and the Brake Powers. To measure the IP of an IC engine (SI Engine here) we use the Morse Test.

How to calculate the power of a cylinder?

Through the computer we can thus get on line indicated diagram and power of all cylinders.] – The area is then divided by the length of the diagram in order to obtain mean height. This mean height, when multiplied by the spring scale of the indicator mechanism, gives the indicated mean effective pressure for the cylinder.

How can you tell the compression pressure in a diesel engine?

The compression pressure and maximum pressure in the cylinder can be presumed from the indicator diagram. Engine indicator is the device used to take the indicator diagram, which can be considered as a ‘stethoscope’ for diesel engines.

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