00:01
Our question is 167, a four -cylinder, four -stroke, 1 .6 -liter gasoline engine operates on the auto cycle with the compression ratio of 11.
00:13
11, the air is at 100 kioskal pressure and 37 degrees centigrade temperature.
00:24
At the beginning of the compression process and the maximum pressure in the cycle is 8 megaparascal.
00:34
The compression and expansion processes may be modeled as polytropic with a polytropic constant of 1 .3.
00:40
Constant specific heat at 850 degree at 850 kelvin determine the temperature at the end of the expansion process, the network output and the thermal efficiency, the mean effective pressure and the engine speed for a net power output of 50 kilowatt, the specific fuel consumption defined as the ratio of metals of fuel consumed to the network produce.
01:07
The air fuel ratio that is defined as the amount of air divided by the amount of fuel intake.
01:18
As the properties of air at this temperature 850 degrees kelvin is cp is equals to 1 .1 .10 kilojouple kjee.
01:30
And cv is equal to 0 .823 killer joule per kjee dot k.
01:41
R is equals to 2 .0 .287 killer jowl per kjj .k .k .k.
01:50
And k is equals to 1 .349 our b and b diagram is like this that is one for q out q in 2 and 3 now for the process 1 to 2 2 that is polytropic compression we write the properties temperature t 2 is equals to t 1 that is v1 divided by v2 our n minus 1 is equal to 3 10 into 11 1 .3 minus 1 is equals to 636 .5 kelvin...