05-04-2013, 04:32 PM
ENGINE TEST SET UP 4 CYLINDR, 4 STROKE, PETROL
ENGINE TEST SET.pdf (Size: 382.39 KB / Downloads: 158)
Description
The setup consists of four
cylinder, four stroke, Petrol
(MPFI) engine connected to
eddy current type
dynamometer for loading. It is
provided with necessary
instruments for combustion
pressure and crank-angle
measurements. These signals
are interfaced to computer
through engine indicator for
Pθ−PV diagrams. Provision is
also made for interfacing
airflow, fuel flow,
temperatures and load
measurement. The set up has
stand-alone panel box
consisting of air box, fuel
tank, manometer, fuel
measuring unit, transmitters
for air and fuel flow
measurements, process
indicator and engine indicator.
Rotameters are provided for
cooling water and calorimeter
water flow measurement.
Apex Innovations
1. Compression stroke: The piston travels up the cylinder, so compressing the
trapped charge. If the fuel is not pre-mixed, the fuel is injected towards the end
of the compression stroke; ignition should again occur before TDC.
Simultaneously under side of the piston is drawing in a charge through a springloaded
non-return inlet valve.
2. Power stroke: The burning mixture raises the temperature and pressure in the
cylinder, and forces the piston down. The downward motion of the piston also
compresses the charge in the crankcase. As the piston approaches the end of its
stroke the exhaust port is uncovered and blowdown occurs. When the piston is at
BDC the transfer port is also uncovered, and the compressed charge in the
crankcase expands into the cylinder. Some of the remaining exhaust gases are
displaced by the fresh charge; because of the flow mechanism this is called ‘loop
scavenging'. As the piston travels up the cylinder, the piston closes the first
transfer port, and then the exhaust port is closed.