In which engine high compression ratio is used?
In which engine high compression ratio is used?
The compression ratio may be higher in engines running exclusively on liquefied petroleum gas (LPG or “propane autogas”) or compressed natural gas, due to the higher octane rating of these fuels. Kerosene engines typically use a compression ratio of 6.5 or lower.
Why we do not use very high compression ratio in CI engine?
(1) With high compression ratio, they operate at higher pressures and offer a cleaner and complete burn of fuel leading to better mileages too. However, it’s not ALL good. The higher pressure requires stronger build of the engine (in some cases heavier). Chances of knocking in the engine are higher.
Which fuel is not used in spark ignition engine?
However, these terms are not preferred, since spark-ignition engines can (and increasingly are) run on fuels other than petrol/gasoline, such as autogas (LPG), methanol, ethanol, bioethanol, compressed natural gas (CNG), hydrogen, and (in drag racing) nitromethane.
What factors limit the compression ratio of a spark ignition?
Spark ignition (SI) engines The compression ratio is limited by the autoignition of the fuel–air mixture ahead of the flame so as not to cause combustion knock.
What should the compression ratio be in a spark ignition engine?
Compression Ratio In Spark-Ignition Engines, we use compression ratio ranging from 6 to 10. The upper limit of this compression ratio will be changed according to the antiknock quality of the fuel used. In compression Ignition Engine, we use the compression ratio ranging from 16 to 20.
How does spark ignition occur in a CI engine?
Hence in the case of CI engines, the ignition of fuel occurs due to compression of the air-fuel mixture and there is no need for spark plugs. Compression ratio for the fuel: In the case of SI engines, the compression ratio of the fuel is in the range of 6 to 10 depending on the size of the engine and the power to be produced.
Which is the upper limit of the compression ratio?
In compression Ignition Engine, we use the compression ratio ranging from 16 to 20. The upper limit of this compression ratio will be changed according to the increase in the weight of the engine. 6. Engine Speed Spark Ignition Engine is a compact engine and lite weight so that can run at very high speeds.
What kind of fuel is used in compression ignition?
In compression Ignition Engine, the Diesel is used as the Combustion fuel. It is non-volatile fuel. self-ignition temperature is comparatively low than petrol. So that it can self-ignite with the elevated temperature in the cylinder created by the highly compressed air. 5. Compression Ratio
Compression Ratio In Spark-Ignition Engines, we use compression ratio ranging from 6 to 10. The upper limit of this compression ratio will be changed according to the antiknock quality of the fuel used. In compression Ignition Engine, we use the compression ratio ranging from 16 to 20.
Hence in the case of CI engines, the ignition of fuel occurs due to compression of the air-fuel mixture and there is no need for spark plugs. Compression ratio for the fuel: In the case of SI engines, the compression ratio of the fuel is in the range of 6 to 10 depending on the size of the engine and the power to be produced.
In compression Ignition Engine, we use the compression ratio ranging from 16 to 20. The upper limit of this compression ratio will be changed according to the increase in the weight of the engine. 6. Engine Speed Spark Ignition Engine is a compact engine and lite weight so that can run at very high speeds.
Why is the high compression ratio not used in an SI engine?
In traditional SI engines high compression creates high heat and high heat in the compressed state causes auto combustion. This is not desirable in an SI engine. The highest compression ratio for a production gas engine is 16:1 on a Mazda skyactiv-X engine.
