Can supercharging of an engine ever lead to reduced power?

In summary, the individual has decided to increase the inlet temperature and pressure of a diesel engine operating on a dual air standard cycle. They have observed that this results in an increase in t2 and p2, but a decrease in t3 and t4 due to the increased pressure. This leads to a decrease in efficiency and power output. They are seeking confirmation if this is true, as supercharging is expected to increase power output. Another individual responds that the decrease in t3 and t4 is due to the constant volume process, and the ratio of t3 to t2 is equal to the ratio of p3 to p2. The individual then mentions that t4 is a function of t3 and thanks the other for their response.
  • #1
chetanladha
59
0
Hi,

I have decided to increase inlet T and P of a typical diesel engine (operatiing on dual air standard cycle).

THeoretically if all other parameters r same, I have observed that t2 (temp at the end of compression) and p2 increases, but t3 (temp at the end of constant volume heating) and t4 (temp at the end of constant pressure heating) tend to decrease because of increased p2.

This fall in temperatures result in reduced efficiency and power output.

Can any1 confirm if this is really true? As Practically, supercharging is supposed to boost the power o/p..

Thanks in advance
 
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  • #2
Why would t3 and t4 decrease because of increased pressure?
 
  • #3
constant volume process.

ratio of t3 to t2 = ratio of p3 to p2

p2 increases = t3 decreases

t4 is a function of t3..
 
  • #4
Sorry i forgot 2 mention

THANKS FOR UR RESPONSE..
 
  • #5
Yes output can decrease, if you have poor inlet geometry or injectors that arent big enough, you'll be spending power compressing air that you then can't use for combustion.
 

Related to Can supercharging of an engine ever lead to reduced power?

1. Can supercharging an engine cause damage?

Yes, supercharging an engine can cause damage if it is not done properly or if the engine is not designed to handle the increased pressure and temperature. This can lead to engine failure or decreased longevity of the engine.

2. Will supercharging improve the fuel efficiency of an engine?

No, supercharging an engine typically leads to decreased fuel efficiency. This is because the increased air flow and pressure requires more fuel to maintain the proper air-to-fuel ratio in the engine.

3. Is it possible to over-supercharge an engine?

Yes, it is possible to over-supercharge an engine by increasing the pressure and airflow beyond the engine's design limits. This can lead to engine damage, decreased performance, and potential safety hazards.

4. How does supercharging affect the overall performance of an engine?

Supercharging can significantly increase the power and torque output of an engine, which can improve its overall performance and acceleration. However, it can also cause increased wear and tear on engine components.

5. Can a supercharged engine run on regular gasoline?

It depends on the engine's design and the level of supercharging. Most supercharged engines require higher octane gasoline to prevent knocking and potential engine damage. However, some modern engines have systems in place to adjust for different fuel types.

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