Understand The Working Principle Of The LPG CNG Injector

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Understand The Working Principle Of The LPG CNG Injector

Posted By lineng nneg     June 23, 2021    

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There are two types of LPG CNG Injector : open and closed. The open injector has a simple structure, but it has poor atomization and is rarely used. Closed injectors are widely used in various diesel engines. The diesel engine sucks in pure air during the intake stroke.

At the end of the compression stroke, the diesel fuel is increased to over 100MPa through the fuel injection pump, injected into the cylinder through the fuel injector, and mixed with the compressed high-temperature air in a short period to form a combustible mixture. Due to the high compression ratio of diesel engines (usually 16-22), the air pressure in the cylinder can reach 3.5-4.5 MPa at the end of compression, while the temperature is as high as 750-1000 K (while the mixed gas pressure of gasoline engines at this time will be 0.6-1.2 MPa, The temperature reaches 600-700K), which greatly exceeds the auto-ignition temperature of diesel. Therefore, after the diesel fuel is injected into the cylinder, it immediately ignites and burns after being mixed with air in a short time.

The air pressure in the cylinder rises rapidly to 6-9MPa, and the temperature also rises to 2000-2500K. Driven by the high-pressure gas, the piston moves downward and drives the crankshaft to rotate to perform work. The exhaust gas is also discharged into the atmosphere through the exhaust pipe.

For more details, please visit LPG Regulator .

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