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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
An Inertial Air-Standard Finite-Time Heat Addition Otto Engine Model
Submission Author:
Christian Naaktgeboren , PR , Brazil
Co-Authors:
Filipe Moreira, Christian Naaktgeboren
Presenter: Christian Naaktgeboren
doi://10.26678/ABCM.ENCIT2020.CIT20-0067
Abstract
This work proposes a novel, multi-disciplinary, coupled, dynamic–thermodynamic, inertial air-standard model for spark-ignited Otto engines that takes into account effects as (i) finite-time heat release, (ii) crank-rod mechanism geometry, basic engine dimensions and operating parameters, as well as (iii) piston, rod, crankshaft, and flywheel inertias. The present model is a two-way coupling between models from the somewhat recent literature, one being predominantly (i) thermodynamic and the other (ii) dynamic in their natures, with the necessary adjustments. The thermodynamic model captures non-trivial, simultaneous heat and work interactions during non-instantaneous heat-releasing processes, while the dynamic model accounts for variable engine angular velocity, as well as translation and rotation inertia of key components, which are taken as rigid bodies. The coupled model herein proposed is able to predict instantaneous and time-averaged crankshaft torque, angular speed and engine power, in terms of several key engine design and operating parameters. Moreover, the model can be suited for teaching in advanced undergraduate and graduate courses.
Keywords
Inertial finite-time heat addition Otto engine model, iFTHA, variable-speed, Two-way Coupling, dynamic-thermodynamic model
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