Week 10: Project 1 - FULL HYDRO case set up (PFI)
1. Intergrated heat release rate curve : This curve tells us about the amount of energy released from the combustion alone. In this particular case the amount of energy released is 1250 J.
2. This curves tells us amount of heat released in the combustion chamber during entire cycle. By integrating this curve we obtain the the integrated heat released as shown in above curve.
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6. Volume plot: This gives us the maximum volume i.e. the swept volume and the min. volume i.e. the clearance volume, which can be further used to find the compression ratio defined as: the ratio of volume of cylinder and combustion chamber when the piston is at the bottom a nd the volume when the piston is at the top-dead centre.
This plot gives us the max and min volume which could be used in the calculation of the compression ratio.
max vol. (`V_1`) = 0.000574 `m^3`
min vol. (`V_2`) = 0.00005704 `m^3`
compression ratio (r) = `V_1/V_2` = 10.063
7. Pressure Plot: gives the maximum amount of preesure produced inside the cylinder.
8. Mean Temperature plot:
From the engine performance calculator table:
IMEP = 896428 Pa
D = 0.086`m`
L= 0.09`m`
I.P. (Indicated power) = `((imep)*((pi/4)*(D^2)*)L))*(N/60)*(K))`
where, N=rpm and K= no. of cylinder.
thus I.P. = 23.43 kW
Also, B.P. = work done * rpm = (468.646 * (3000/60))/1000 = 23.43 kW
As, B.P. = `(2*(pi)*(N)*(T))/60`
this gives Torque (T) = 74.57 Nm
For,Combustion efficiency:
Fuel mass per cycle = 0.00003 kg
lower calorific value of fuel = 44 MJ/kg.
Heat Supplied by the fuel = `m_f` * `L_(cv)` = 0.00003 * 44 = 1320 J
Heat released during the combustion = 1250 J (from IHR curve)
Combustion efficiency = `1250/1320 = 0.9469` (94.69 %)
ca10 , ca50 , ca90 : these basically represents the the progress of combustion i.e. 10, 50, 90 implies the percent of energy released during the combustion. They basically represent the the start of ignition and the End of pre-mixed combustion.
YouTube link for Temp. distribution animation: