A Theoretical Study On The Heat Transfer Process
In Diesel Engines
Author(s)
H. Fridriksson, B. Sund´en & S. Hajireza
Abstract
The current and future emissions regulations and demands on internal combustion
engines have increased the need for improvement of the thermal design and engine
efficiency. This paper reports an initial investigation concerning in-cylinder heat
transfer. In addition, a literature review in this field is presented. It was found
that no extensive application studies have been performed on full cylinder heat
transfer by taking the effect of combustion and gas exchange into the account.
The available literature is mainly focused on individual component studies and
sub-model improvements.
Furthermore, a simple parameter study is performed in order to estimate the
contribution of each parameter on the in-cylinder engine heat transfer. This is done
by setting up an engine segment, using the commercial CFD tool AVL FIRE and
the automatic mesh generator AVL Ese Diesel. Engine segment simulations are
made for the period between IVC (intake valve closing) and EVO (exhaust valve
opening). The parameter study revealed that most of the parameters selected do
in-fact significantly affect the in-cylinder heat transfer. However, the effects on the
indicated mean effective pressure, or indicated power output, are different.
Keywords: engine heat transfer, CFD, AVL FIRE, Parameter study.
1 Introduction
With todays strict requirements on internal combustion (IC) engine performance,
with regards to emissions, it becomes more important to obtain optimized engine
design, using computational fluid dynamics (CFDs) tools. The latest developments
in IC engine design are leading towards smaller, more compact and efficient
engines, which prove to be quite demanding on the combustion control and engine
Keywords
engine heat transfer, CFD, AVL FIRE, Parameter study
Related Book
Other papers in this volume
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