The automotive industry is currently facing the challenge of
significantly stringent requirements regarding CO₂ emission and
fuel economy coming from both legislations and customer demand.
Advanced engine technologies play a vital role for downsizing of
gasoline engine. The development of key design technologies for
high efficiency gasoline engines is required for the improvement of
competitive power in the global automobile industry. This paper
focused on effect of geometry of intake manifold of gas exchange
process and consequently the performance of the engine. Specially,
the optimal design technologies for the intake manifold and intake
port shape must be established for high performance, increasingly
stringent fuel economy and emission regulations. Space in vehicle
or packaging constraints and cost are also important factors while
consideration of the design.
Two models of intake manifolds discussed in this paper, such as
short runner intake manifold and long runner intake manifold with
different plenum chambers. Parameters like manifold plenum volume,
runner length affecting dynamically on gasoline turbocharged engine
performance are studied and evaluated. By employing these
parameters, performance prediction of 2.2-liter MPFI Turbocharged
Gasoline Engine is done by using mathematical models made from AVL
Boost 5.1 software. CFD simulations are conducted on the both
proposal to examine the distribution of the air flow from plenum to
individual runners. Actual test bed engine performance is predicted
and compared with boost performance. Injector position is defined
on last section of primary pipe or runner in order to maximize fuel
vaporization. The fact, fuel should not be injected on port walls
and accordingly angle has been confirmed by injector target
test.