1. Forced induction TURBOCHARGERS VS. SUPERCHARGERS BY G.
JAYAKRISHNASEKHAR REDDY (10G81A0310)
2. Abstract This seminar gives the overview of forced induction
processes for the engine and their advantages and disadvantages.
The forced induction is a process in combustion engines by which we
can increase the efficiency of an engine. The main purpose of
forced induction process is to increase the volumetric efficiency,
reusing the waste hot gases, increasing the engine horse power,
reducing the emissions from the engine by maintaining the
sufficient combustion rate. In this seminar, we specifically
discuss two important forced induction processes, one is
turbocharging and supercharging and which is best one for the
engines that we are using in real world. What is the solution if
two process arent fit separately?
3. FORCED INDUCTION What is forced induction? Process of
delivering the compressed air. Why forced induction? Increase the
engine power efficiency, total compression ratio. Maximum energy
per unit of fuel.
4. General forced induction process 1. Turbocharger 2.
Supercharger 3. Nitrous oxide (NO2 )
5. TURBOCHARGER What is a turbocharger? Turbine driven forced
induction device Why turbocharging? Increase performance of an
engine, fuel efficiency. How it operates? Turbine drive the
compressed air into the engine Turbo lag Boost threshold
7. Twin turbochargers Two separate turbochargers Parallel or
series Parallel one half of engines exhaust Series one runs on low
speed and other on high speed
8. Twin scroll turbochargers 1. Two exhaust nozzles 2. Two
inlet nozzles 3. Physically separate the channels for the
cylinders
9. Variable geometry turbochargers 1. Use movable vanes 2.
Adjusted by actuator 3. Maintains exhaust velocity and back
pressure
10. SUPERCHARGERS What is a supercharger? Air compressor that
increases the engines performance Why supercharging an engine? To
produce the boost when engine operates How it operates? Types 1.
Positive displacement type 2. Dynamic compressor type
11. Positive displacement type
12. Roots type supercharger 1. Meshing lobes 2. Air trapped
between fill side and discharge side 3. Large and sit on top of the
engine 4. External compression type 5. Add weight 6. Least
efficient superchargers 7. Back flow
13. Twin screw superchargers 1. Lysholm style blowers 2. Use
meshing lobes like worm gears 3. Compress the air inside the root
housing 4. More efficient and more cost 5. More noise 6. Internal
compression type 7. No back flow
14. Dynamic compressor type
15. Centrifugal supercharger 1. Powers an impeller 2. Resembles
turbocharger 3. Uses impeller 4. Convert the high speed, low
pressure air to low speed, high pressure air 5. Most efficient and
most commonly used forced induction systems
16. Turbochargers vs. Superchargers
17. Head to head comparison TURBOCHARGERS 1. Cost is nearly
same as superchargers 2. Lag 3. Uses waste gases to run 4. It is
very hot in condition 5. Surge may deliver to the engine 6. Back
pressure 7. Less noise 8. Less reliable 9. Difficult to install and
tune 10. High power output and runs even at high rpm SUPERCHARGERS
1. Cost is nearly same as turbochargers 2. No lag 3. Uses crank
power to run 4. Fresh air discharge 5. No surge 6. No back pressure
7. More noise 8. More reliable 9. Easy to install and tune 10. Less
power output when compared to turbos
18. conclusion While the supercharger is generally considered
to be a method of forced induction for most street and race
vehicles, the turbo will always have its place in a more
specialized market. Superchargers generally provide a much broader
powerband that most drivers looking for with no turbo lag. In
addition, they are much easier to install and tune.
19. Another Solution
20. Twincharger Uses both turbocharger and supercharger
Desirable for small displacement motors with high rpm Roots charger
and turbocharger in series Electromagnetic clutch Low rev
supercharger Later turbo join Then both contribute High rev
supercharger disengages High cost