Engine Cylinder Temperature and Pressure after Compression
09/27/2010 12:07 AM
in a typical diesel engine cylinder, what is the usual temperature and pressure of air before and after it is compressed ? how much of diesel fuel is supplied into the cylinder ? what is the temperature and pressure after combustion ??
in a typical diesel engine cylinder, what is the usual temperature and
pressure of air before and after it is compressed ? Ambient and atmospheric.
how much of diesel
fuel is supplied into the cylinder ? Just enough. what is the temperature and
pressure after combustion ?? How soon after combustion?
I would not give a value because of many parameters involved:
"it is the pressure at which the compressed air reaches the self ignition temperature of diesel oil".
In a engine cylinder air suffers a polytropic compression with an exponent depending on the intensity of heat transfer from air to cylinder wall, ratio stroke/d, rpm,....
For diesel oil the self ignition temperature is ≈483K, incoming air if no supercharger or pre-heater are present has about (standard value) 293 to 298 K.
The exponent varies between 1.2 and 1.4 (adiabatic). It is quite difficult if not impossible to give more than an order of magnitude since the ratio p2/p1 varies for above values between 20 and 5.8.
Engine Cylinder Temperature and Pressure after Compression
Re: engine cylinder
