What does indicator card engine mean?

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What does indicator card engine mean?

The taking of indicator cards, allows the engineer to receive more information about the combustion process (via the draw or out of phase card), measure the cylinder power output of the engine (via the power cards), and check the cleanliness of the scavenging process (via the light spring diagram).

What is Pcom and Pmax?

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.

How do you calculate engine power without indicator cards?

Q – How to calculate the engine power without indicator cards? Power calculation without Indicator Diagram. The fuel pump index is used to find out the MEP from the nomogram graph. Again from the graph, the mep at a specific speed gives the engine bhp.

What is indicator diagram of IC engine?

An indicator diagram is a chart used to measure the thermal, or cylinder, performance of reciprocating steam and internal combustion engines and compressors.

What is draw card in main engine?

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 power card in diesel engine?

A power card is a graph of cylinder pressure against time. Purpose Of Taking Power Cards: · To calculate indicated power of the engine. · To determine peak pressures and compression pressures. · To evaluate the process of combustion inside the engine.

What is Pmax in marine diesel 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?

Types of Indicator Diagrams. 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.

How is power card power calculated?

How to calculate power of Main Engine (2 stroke engine)?

Power card or PV diagram can be used to measure indicated power in diesel engines.
Calculations.
Work done in one cycle = Mean Indicated Pressure x Area of the Piston x Length of stroke = [Pm] x [A] x [L]
Indicated Power of Unit = Pm L A N.

What is draw card diagram?

What is the difference between Pmax and Pcomp?

Unlike the Pcomp, the Pmax is also affected by the injection timing and the amount of injected fuel. As illustrated in Figure 3, earlier SOI increasing the Pmax. One important engine running parameter is the ratio between the amount of injected fuel and the quantity of trapped air.

What is the purpose of indicator cards in an engine?

How many types of indicator cards are there?

There are five types of indicator cards, which can provide the following information: Take proper PPE protections like gloves, goggles, safety shoes and proper outfit. Use proper tools supplied with the instrument to open and close the cocks.

How to reduce the effect of friction on the indicator card?

1) To reduce effect of friction the indicator card piston is removed, the piston and the cylinder is cleaned and lubricated. 2) The tightness of the indicator piston in the cylinder is checked. This is done by dismantling the piston and allowing it to drop slowly through the cylinder by its own weight.

How to connect the instrument to the indicator cock?

Before connecting the instrument to the Indicator cock, open indicator cock, allow two or three firing strokes, to blow out soot and combustion residues in the cock. fasten the instrument to the cock so that the cord is taut. Take the atmospheric line with the cock shut.

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