Pressure coefficient of a diesel engine

In summary, the conversation discusses the possibility of calculating the pressure coefficient of an engine using heat exchanger, exhaust calorimeter, and dynometer readings. The speaker also clarifies that the pressure coefficient cannot be calculated for the engine itself, but only for points of flow within the engine. There is also a brief discussion about the specific heat and its abbreviation.
  • #1
Ry122
565
2
With Heat exchanger, Exhaust Calorimeter (water and gas) temperatures along with dynometer readings for each temperature reading, is it possible to calculate the pressure coefficient of the engine?
If so, what formula would be required?
 
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  • #2
I have calculated pressure ratio's in diesel engines before but I have never heard of a pressure coefficient. What is that? By knowing that value what can one learn from it?

Thanks
Matt
 
  • #3
You can't have a Cp for an engine, as Cp conerns the relative pressures in flow of fluids.

So you could have Cp for points of flow in the engine. But not the engine itsself.
 
  • #4
Ohh, you mean the specific heat of costant pressure? Yes, you cannot have this since as the combustion cycle, cycles, the pressure is changing.

Thanks
Matt
 
  • #5
CFDFEAGURU said:
Ohh, you mean the specific heat of costant pressure? Yes, you cannot have this since as the combustion cycle, cycles, the pressure is changing.

Thanks
Matt

Nah I was just using Cp for pressure coefficient. I forgot that specific heat has the same abbreviation/symbol.
 
  • #6
LOL, okay.

Thanks
Matt
 

What is the pressure coefficient of a diesel engine?

The pressure coefficient of a diesel engine is a measure of the efficiency of the engine's combustion process. It is a ratio of the actual peak pressure in the engine cylinder to the ideal peak pressure that would result in complete combustion of the fuel.

How is the pressure coefficient calculated?

The pressure coefficient is calculated by dividing the actual peak pressure in the engine cylinder by the ideal peak pressure. The ideal peak pressure can be determined through mathematical calculations based on the properties of the fuel and air mixture in the engine.

What factors can affect the pressure coefficient of a diesel engine?

There are several factors that can affect the pressure coefficient of a diesel engine, including the quality and type of fuel, the compression ratio of the engine, the condition of the fuel injection system, and the design and condition of the engine components such as the pistons and valves.

Why is the pressure coefficient important in diesel engines?

The pressure coefficient is an important measure in diesel engines as it indicates the efficiency of the combustion process. A higher pressure coefficient means that the engine is able to extract more energy from the fuel, resulting in better performance and lower emissions.

How can the pressure coefficient be improved in a diesel engine?

To improve the pressure coefficient of a diesel engine, various measures can be taken such as using high-quality fuel, optimizing the engine's compression ratio, maintaining the fuel injection system, and ensuring that the engine components are in good condition. Regular maintenance and tuning can also help improve the pressure coefficient.

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