Parametric Investigation of Combustion and Heat Transfer Characteristics of Oscillating Linear Engine Alternator

An Oscillating Linear Engine Alternator (OLEA) has the potential to overcome the thermal, mechanical, and combustion inadequacies encountered by the conventional slider-crank engines. The linear engines convert the reciprocating piston motion into electricity, thereby eliminating needless crankshaft linkages and rotational motion. As the dead center positions are not explicitly identified unlike crankshaft engines, the linear engine exhibits different stroke and compression ratio every cycle and should manage the unfavorable events like misfire, rapid load changes, and overfueling without the energy storage of a flywheel. Further, the apparatus control and management strategy is difficult for OLEA when compared to conventional engines and depends on the combustion event influencing the translator dynamics. In this research paper, the MATLAB®/Simulink numerical model of a single cylinder, mechanical spring assisted, 2-stroke natural gas fueled, spark-ignited OLEA was investigated to enhance the perception of the coupled system. The effect of combustion and heat transfer characteristics on translator dynamics and performance of OLEA were analyzed by using Wiebe form factors, combustion duration, and heat transfer correlations. Variation in the Wiebe form factors revealed interesting insights into the translator dynamics and in-cylinder thermodynamics of a coupled system. High translator velocity, acceleration, and higher heat transfer rate were favored by low combustion duration.

[1]  G. G. Stokes "J." , 1890, The New Yale Book of Quotations.

[2]  H. O. Farmer Free-Piston Compressor-Engines: , 1947 .

[3]  R. Stephenson A and V , 1962, The British journal of ophthalmology.

[4]  W. J. D. Annand,et al.  Heat Transfer in the Cylinders of Reciprocating Internal Combustion Engines , 1963 .

[5]  G. Woschni A Universally Applicable Equation for the Instantaneous Heat Transfer Coefficient in the Internal Combustion Engine , 1967 .

[6]  G. Hohenberg Advanced Approaches for Heat Transfer Calculations , 1979 .

[7]  John A. Michon,et al.  Design considerations , 1993, Generic Intelligent Driver Support.

[8]  S. K. Ingram,et al.  Free-piston engine linear generator for hybrid vehicles modeling study. Interim report, January-August 1994 , 1995 .

[9]  Peter Van Blarigan,et al.  Homogeneous Charge Compression Ignition with a Free Piston: A New Approach to Ideal Otto Cycle Performance , 1998 .

[10]  Jingdong Chen,et al.  Development of a linear alternator-engine for hybrid electric vehicle applications , 1999 .

[11]  Peter Van Blarigan,et al.  A numerical study of a free piston ic engine operating on homogeneous charge compression ignition combustion , 1999 .

[12]  Lixin Peng,et al.  Free Piston Engine Its Application and Optimization , 2000 .

[13]  Sorin Petreanu,et al.  Conceptual analysis of a four -stroke linear engine , 2001 .

[14]  Nigel N. Clark,et al.  Numerical Simulation for Parametric Study of a Two-Stroke Direct Injection Linear Engine , 2002 .

[15]  Douglas Carter,et al.  The Free Piston Power Pack: Sustainable Power for Hybrid Electric Vehicles , 2003 .

[16]  Peter Van Blarigan,et al.  Optimizing the Scavenging System for a Two-Stroke Cycle, Free Piston Engine for High Efficiency and Low Emissions: A Computational Approach , 2003 .

[17]  Csaba Toth-Nagy,et al.  Linear engine development for series hybrid electric vehicles , 2004 .

[18]  Nigel N. Clark,et al.  The Linear Engine in 2004 , 2005 .

[19]  R. Mikalsen,et al.  A review of free-piston engine history and applications , 2007 .

[20]  R. Mikalsen,et al.  A computational study of free-piston diesel engine combustion , 2009 .

[21]  Youngjae Lee,et al.  The performance characteristics of a hydrogen-fuelled free piston internal combustion engine and linear generator system , 2009 .

[22]  R. Mikalsen,et al.  Predictive piston motion control in a free-piston internal combustion engine ✩ , 2010 .

[23]  Doron Aurbach,et al.  Challenges in the development of advanced Li-ion batteries: a review , 2011 .

[24]  Wen Li,et al.  Multi-dimensional scavenging analysis of a free-piston linear alternator based on numerical simulation , 2011 .

[25]  Horst E. Friedrich,et al.  The Free Piston Linear Generator - Development of an Innovative, Compact, Highly Efficient Range Extender Module , 2013 .

[26]  Takaji Umeno,et al.  Development of Free Piston Engine Linear Generator System Part 1 - Investigation of Fundamental Characteristics , 2014 .

[27]  Frank Rinderknecht,et al.  Design of future concepts and variants of The Free Piston Linear Generator , 2014, 2014 Ninth International Conference on Ecological Vehicles and Renewable Energies (EVER).

[28]  Guohong Tian,et al.  Development Approach of a Spark-Ignited Free-Piston Engine Generator , 2014 .

[29]  Yaodong Wang,et al.  Stable Operation and Electricity Generating Characteristics of a Single-Cylinder Free Piston Engine Linear Generator: Simulation and Experiments , 2015 .

[30]  Nigel N. Clark,et al.  Effect of Combustion Timing and Heat Loss on Spring-Assisted Linear Engine Translator Motion , 2016 .

[31]  A. Tatarnikov,et al.  TWO-STROKE DIRECT FUEL INJECT FREE PISTON GENERATOR FROM THEORY TO PRACTICE , 2016 .

[32]  Ocktaeck Lim,et al.  A review of free-piston linear engines , 2016 .

[33]  Matthew C. Robinson,et al.  Study on the Use of Springs in a Dual Free Piston Engine Alternator , 2016 .

[34]  Hui-hua Feng,et al.  In-cylinder heat transfer and gas motion of a free-piston diesel engine generator , 2017 .

[35]  Yaodong Wang,et al.  Analysis of the Scavenging Process of a Two-Stroke Free-Piston Engine Based on the Selection of Scavenging Ports or Valves , 2018 .