How do you calculate the work of a diesel cycle?

How do you calculate the work of a diesel cycle?

In an actual Diesel engine the gas is simply exhausted from the cylinder and a fresh charge of air is introduced. The net work Wnet done over the cycle is given by: Wnet = (Wexp + W1-2), where as before the compression work W1-2 is negative (work done on the system).

What is the PV diagram of diesel cycle?

Summary Process Operation
1. 1-2: Isentropic compression Compression of air.
2. 2-3: Constant Pressure heat addition Heat is added from an external source (hot body)
3. 3-4: Isentropic expansion Expansion of air takes place due to heat addition.
4. 4-1: Constant volume heat rejection Heat is rejected to a sink.

What is PV diagram in engine?

The pressure-volume (pV) diagram is drawn by measuring the pressure inside the cylinder, and plotting its value against the angle of the crankshaft, over a complete engine cycle (720°). Let’s see what’s happening in the cylinder during each piston stroke, how the pressure and volume are changing inside the cylinder.

How do you calculate P-V diagram efficiency?

The efficiency can not be determined solely from the P-V diagram. The efficiency is equal to the work done divided by the input heat added.

What are the four processes of diesel cycle?

Diesel Cycles have four stages: compression, combustion, expansion, and cooling.

What is the working fluid in case of an Diesel cycle?

Air, which is 79% nitrogen, is the working fluid in a conventional diesel engine. The nitrogen is discarded after use, along with combustion products. In closed-cycle diesel engines, exhaust gas is re-circulated after combustion-produced by-products are separated and removed from the inert working fluid.

What is the difference between Diesel cycle and Otto cycle?

Otto cycle is used for petrol or spark ignition engine while diesel cycle is used for diesel or compression ignition engine. The main difference between Otto cycle and Diesel cycle is that in Otto cycle heat addition takes place at constant volume and in diesel cycle heat addition takes places at constant pressure.

What is the compression ratio of Otto cycle?

In the ideal Otto cycle the fuel-air mixture is introduced during the induction stroke and compressed to a much lower compression ratio (around 8:1) and is then ignited by a spark. The combustion results in a sudden jump in pressure while the volume remains essentially constant.

How do you calculate work in P-V diagram?

We can find the work done by determining the total area under the curve on a PV diagram. We have to make sure we use the total area, all the way down to the volume axis. For instance, we can imagine viewing the area under the curve in the example shown above as a triangle and a rectangle (as seen below).