12-09-2014, 02:31 PM
PERFORMANCE ANALYSIS OF SUPERCHARGING OF TWO WHEELERS
PERFORMANCE ANALYSIS.pdf (Size: 153.18 KB / Downloads: 47)
ABSTRACT
The objective of this work is to increase the torque and power of the two wheeler by
supercharging the vehicle. For this purpose LML freedom 125 cc is analysed for the work
and certain parameters like torque, power, and specific fuel consumption vs rpm are
calculated. The data calculated is used in software Engine Analyser for analysis purpose
together with the data of supercharger. It can be seen that power and torque of the engine
increases from 7 to 11 KW and 9 to 13 NM at 7500 and 9000 RPM respectively
INTRODUCTION
A supercharger is essentially a large pump that compresses air and forces it into
the engine’s air intake. Turbochargers do the same thing, only they are run by exiting
exhaust gasses, while superchargers are powered by the engine’s spinning crankshaft,
normally via the accessory belt. Supercharging an engine often results in huge power
increases in the range of 50% to 100%, making them great for racing, cross country
flying, or just having fun. And because of the way superchargers work, they provide
power only when the engine is under full throttle or under load not under normal cruising
conditions. This means that the supercharger will not affect the engine’s reliability,
longevity, or fuel economy under normal conditions.
EXPERIMENTAL SETUP
A single cylinder 4-stroke air-cooled petrol engine developing a power output of 3.7 kW
is used for the work. Engine specification is given (see Table 2.1.). A rope brake
dynamometer is used for loading the engine. Computerized SI engine is observed at
different at different RPM. The parameters related to the performance of the engine,
which were evaluated, are: specific fuel consumption, brake power, torque, fuel
consumption. These parameters were evaluated for each RPM.
RESULTS AND DISCUSSIONS
The data analysis in the ENGINE ANALYZER software shows that the power and torque
of the engine without modification and modified engine which can be seen in the figures
3.1 and 3.2 respectively.
The figure 3.1 shows that the power developed at 4000 rpm is more than 3.3 KW and
increases as the rpm of the engine increases and becomes maximum at 9000 rpm about
7.5 KW. The torque of the engine starts from 7.9 Nm at 4000 rpm and becomes
maximum about 9 Nm at 7000 rpm. Now from figure 3.2 it can be seen that the useful
power developed at 4000 rpm is more than 300 KW which is much more than the power
developed without supercharger. Also, the torque developed by the modified engine
shows the value of 11.48 Nm at 4000 rpm and gives highest value of about 13.35 Nm at
7000 rpm. This increase in power and torque of the engine is due to the more air
consumption by the engine.
CONCLUSIONS
It can be concluded that it is possible to install a supercharger in case of commercial two
wheelers which increases their power on an average about 152 % more than the original
engine. So, supercharging can be done on those engines where maximum power and
torque is desired on the verge of more fuel consumption. Fig.1 shows the power and
torque characteristics of the given engine and the modified engine. It can be seen the torque of the modified engine is highest at 7000 rpm and after that there is decrement of
torque due to the fast opening and closing of valves of the engine.