scholarly journals Design of tubular moving magnet linear alternator for use with an external combustion - free piston engine

2016 ◽  
Author(s):  
A.S. Jalal ◽  
N.J. Baker ◽  
D. Wu
Keyword(s):  
Piston Engine ◽  
Free Piston ◽  
Free Piston Engine ◽  
Linear Alternator ◽  
External Combustion ◽  
Moving Magnet

scholarly journals Performance of a tubular machine driven by an external-combustion free-piston engine

2019 ◽  
Vol 2019 (17) ◽  
pp. 3867-3871
Author(s):  
Nick J. Baker ◽  
Ramin M. Korbekandi ◽  
Aslan Sa. Jalal ◽  
Dawei Wu
Keyword(s):  
Piston Engine ◽  
Free Piston ◽  
Free Piston Engine ◽  
External Combustion

scholarly journals Advanced combustion free-piston engines: A comprehensive review

2018 ◽  
Vol 21 (7) ◽  
pp. 1205-1230 ◽  
Author(s):  
Yingcong Zhou ◽  
Aimilios Sofianopoulos ◽  
Benjamin Lawler ◽  
Sotirios Mamalis
Keyword(s):  
Low Temperature ◽  
Low Temperature Combustion ◽  
Piston Engine ◽  
Free Piston ◽  
Widespread Application ◽  
Comprehensive Review ◽  
Advanced Combustion ◽  
Free Piston Engine ◽  
Linear Alternator ◽  
Temperature Combustion

A reciprocating engine without a crank-slider mechanism is called a free-piston engine. If the piston is directly connected to a linear alternator, it is called a free-piston linear alternator. Free-piston engines and free-piston linear alternators have the potential to offer solutions for future hybrid electric vehicles and stationary power generation, by enabling direct conversion of mechanical energy to electricity. They benefit from reduced friction losses compared to conventional engines and can have variable compression ratio, which enables combustion control and optimization. Their widespread application has been limited by the necessity for high-speed control strategies. However, their operating characteristics can provide high efficiency, especially when used with low temperature combustion strategies. Low temperature combustion combines the high thermal efficiency of diesel engines, with the low soot emissions of spark-ignition engines, and low NO x emissions because of low burned gas temperatures. This article provides a comprehensive review of free-piston engine technology, with a focus on advanced combustion processes and their potential for use in future powertrain systems.

Modeling and Experimental Characterization of a Permanent Magnet Linear Alternator for Free-Piston Engine Applications

2009 ◽  
Author(s):  
Hans T. Aichlmayr ◽  
Peter Van Blarigan
Keyword(s):  
Mathematical Model ◽  
Permanent Magnet ◽  
Experimental Validation ◽  
Experimental Characterization ◽  
Piston Engine ◽  
Free Piston ◽  
Free Piston Engine ◽  
Linear Alternator ◽  
The Mathematical Model

Sandia National Laboratories is developing a prototype 30kW free-piston internal-combustion-based linear generator for vehicular applications. This paper describes the development and experimental validation of a mathematical model for the permanent magnet linear alternator that will be used by the prototype. A magnetic-flux versus mover-position function is used to correlate individual coil fluxes to the motion of the mover. This function is derived from a finite element electromagnetic simulation of the linear alternator. The mathematical model of the alternator is compared to experiments with prototype hardware driving 0.5–2kW loads; excellent correspondence to measured voltage and current waveforms is found.

Study of radial and axial magnets for linear alternator — Free piston engine system

2017 ◽  
Author(s):  
Jayaram Subramanian ◽  
Gregory Heiskell ◽  
Fereshteh Mahmudzadeh ◽  
Parviz Famouri
Keyword(s):  
Piston Engine ◽  
Free Piston ◽  
Free Piston Engine ◽  
Linear Alternator ◽  
Engine System

Operation of a turbine-compound free-piston linear alternator

2021 ◽  
pp. 146808742110159
Author(s):  
Chang-Ping Lee ◽  
Claus Borgnakke ◽  
Russell Durrett
Keyword(s):  
Injection Timing ◽  
Actual Behavior ◽  
Piston Engine ◽  
Combustion Chambers ◽  
Free Piston ◽  
Free Piston Engine ◽  
Linear Alternator ◽  
Mechanical Models ◽  
Control Volumes ◽  
Engine Map

A free-piston linear-alternator combined with combustion chambers has been examined in many studies. However, only simplified thermodynamic and mechanical models were developed to mimic the actual behavior of the free-piston engine. The purpose of this study is to establish a fully dynamic model that can calculate the energy transformation under the operation of the free-piston engine. The Matlab/Simulink® model uses non-constant-volume combustion event, the piston transient dynamics, flow, heat losses, and thermodynamics as bridges to connect control volumes. The model successfully captured the behavior and measurements of a GS-34 free-piston engine, based on a thermodynamic calculation calibrated with experimental data. The resulting model is used for a series of parametric studies to understand the very complex system behavior, including low load operation. Operation parameters (injection timing and bounce chamber mass) are optimized to generate the engine map for different alternator sizes. At the end, the advantages of the opposed free-piston engine with a linear alternator are presented through the energy analysis.

Experimental Evaluation of a Prototype Free Piston Engine - Linear Alternator (FPLA) System

2016 ◽  
Author(s):  
Terry A. Johnson ◽  
Michael T. Leick ◽  
Ronald W. Moses
Keyword(s):  
Experimental Evaluation ◽  
Piston Engine ◽  
Free Piston ◽  
Free Piston Engine ◽  
Linear Alternator

scholarly journals Experimental Evaluation of the Free Piston Engine - Linear Alternator (FPLA)

2015 ◽  
Author(s):  
Michael T. Leick ◽  
Ronald W. Moses
Keyword(s):  
Experimental Evaluation ◽  
Piston Engine ◽  
Free Piston ◽  
Free Piston Engine ◽  
Linear Alternator

Modeling of a Two-Stroke Free-Piston Engine With HCCI Combustion

2010 ◽  
Author(s):  
Ke Li ◽  
Wilson Santiago ◽  
Zongxuan Sun
Keyword(s):  
Internal Combustion Engines ◽  
High Energy ◽  
High Energy Density ◽  
Hydraulic Pump ◽  
Piston Engine ◽  
Free Piston ◽  
Engine Operation ◽  
Hcci Combustion ◽  
Free Piston Engine ◽  
Linear Alternator

This paper describes the modeling of a two-stroke dual chamber free piston engine (FPE) running homogeneous charge compression ignition (HCCI) combustion with an embedded linear alternator and a hydraulic pump. Variable compression ratio of FPE enables multi-fuel operation. Furthermore, the addition of an electric generator and hydraulic pump ensure the engine to have both high energy density and power density. These three concepts combined, will make for a highly efficient and flexible approach for engine operation. However, the characteristic of FPE also brings challenges in engine control. We propose a control oriented model that provides detailed gas exchange processes between intake/exhaust and cylinder volume, and the dynamic interactions between combustion, the linear alternator and the hydraulic pump. Influences of fuel and valve timing on engine performance are studied. Simulated engine dynamics are observed to have significant differences from conventional internal combustion engines.

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