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**Topic under **Machine Systems

**Source:** berrygroup.uchicago.edu

**File size:** **656.62 KB**

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**Last download on:**
Thu Apr 12, 2018 05:48:17 AM

__Short Desciption__:

Power and efficiency limits for internal combustion engines via methods
of finite-time thermodynamics, I. INTRODUCTION
“In selecting an idealized process one is always faced
with the fact that the simpler the assumptions, the easier
the analysis, but the farther the result from reality” (Ref.
1, p. 23). The more assumptions we make, the farther we
are likely to be from reality. On the other hand, detailed,
realistic models for internal combustion engines are difficult
and expensive to compute and analyze.2 If we are
interested in maximum power output or in maximum efficiency
of internal combustion engines two ways of approaching
the problem are possible. We could incorporate
the major loss terms such as friction loss, heat leak, and
incomplete combustion in a simple model based on airstandard
cycle with rate-dependent loss mechanisms. Then
using optimal control theory we can compute the piston
trajectory which yields maximum power output. This approach
has been realized in Refs. 3 and 4 and it is an
application of the methods of finite-time thermodynamics.
Another approach is to use a more detailed, “realistic”
model and try only to fmd approximate upper limits for
possible performance rather than to determine directly the
optimum trajectory which yields the best performance.
This approach has been realized in Ref. 5 and it is also an
application of the methods of finite-time thermodynamics.

__Summary__:

Theoretical results of this paper may be useful in two
different ways. First, it is more realistic to compare power
and efficiency of real engines to ( 14) than to air-standard cycle efficiency. Second, it may be a stimulus for research
in thefield of constructing highly efficient nonconventional
internal combustion engines with heating systems instead
of cooling systems.

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