The Automotive Free-Piston-Turbine Engine

Frey, Donald N.; Klotsch, Paul; A, Egli

doi:10.4271/570051

Cited by 13 publications

(6 citation statements)

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“…Frey et al [31] mention the potential advantages of mounting the gas generator in the front of the vehicle and the power turbine in the rear, thereby eliminating the drive tunnel and achieving better weight distribution (this is also discussed by Underwood of General Motors [22]). …”

Section: Air Box Fuel Injectormentioning

confidence: 99%

A review of free-piston engine history and applications

Mikalsen

Roskilly

2007

Applied Thermal Engineering

396

186

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This document reviews the history of free-piston internal combustion engines, from the air compressors and gas generators used in the mid-20th century through to recent free-piston hydraulic engines and linear electric generators. Unique features of the free-piston engine are presented and their effects on engine operation are discussed, along with potential advantages and disadvantages compared to conventional engines. The paper focuses mainly on developed engines where operational data has been reported. Finally, the potential of the free-piston engine is evaluated and the most promising designs identified.

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Section: Air Box Fuel Injectormentioning

confidence: 99%

A review of free-piston engine history and applications

Mikalsen

Roskilly

2007

Applied Thermal Engineering

396

186

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“…The French SIGMA freepiston gasifier saw service for decades in stationary power generation. The use of free-piston engines in automotive application was most heavily promoted in the period 1952 to 1961, when both General Motors and Ford Motor Company produced running prototypes [2,3]. In both cases these engines were two-stroke, opposed piston spark ignited engines with combustion bounce/compression chambers.…”

Section: Free Piston Enginesmentioning

confidence: 99%

Conceptual analysis of a four -stroke linear engine

Petreanu¹

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research into new auxiliary power generation devices has led to the development of a novel crankless reciprocating internal combustion engine. This dissertation presents a conceptual design of a Four-Stroke Linear Engine based on the numerical simulation of the operation of this type of linear engine. The engine consists of four opposed pistons linked by a connecting rod to a linear alternator. A series of numerical simulations was developed and employed to investigate the operation and performance of this crankless, four stroke linear engine. Since this linear engine is crankless, the numerical analysis of this particular engine is a time-based analysis. Two numerical models permit the simulation of the Four-Stroke Linear Engine employing Direct Injection Compression Ignition mode and a Homogeneous Charge Compression Ignition (HCCI) mode. The engine computational model combines dynamic and thermodynamic analyses. A detailed analysis of the engine operation range allows results to be obtained from a parametric study. The parametric study was performed to predict the engine behavior over a wide operating range, given intake parameters, variations in fuel combustion properties, reciprocating mass of the piston shaft assembly, frictional load and the externally applied load, and injection and valve timing. Based on the parametric study a conceptual design for a 15 kW linear engine was developed, showing the effects of reciprocating mass and air to fuel ratio on frequency of operation, power output, and efficiency. The engine analysis shown that this engine has a limited range of operation. The engine operating in as a direct injection compression ignition permitted high efficiency with values between 46 and 49 % corresponding to a compression ratio range between 17 and 35. The analysis performed for the engine operating as a HCCI mode revealed that this particular operating mode depends critically on the start of combustion, which depends in turn on piston motion which is not prescribed. Although the HCCI operation permitted to achieve high values of the efficiency (over 60%) and power output it was observed that the operation domain for the engine was much narrower than for the direct injection case. The results obtained from the numerical simulation show that the FSLE operating under HCCI is difficult to control and this observation extends to any mechanical arrangement of the linear engine with unconstrained piston motion. iii ACKNOWLEDGEMENTS My past five years as graduate student at West Virginia University represent one of the greatest experiences of my life. During this period I had the chance to meet new people and to make a lot of friends. It is very difficult to write this section since there are so many people to mention. I must first thank Dr. Christopher M. Atkinson for giving me the opportunity to attend graduate school and for being my advisor and especially for his for his unvaluable help and understanding during this long period. I want to assure Dr. Atkinson that I learn so many things from him. I ...

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“…Frey et al [6] built and tested a free piston gas generator turbine set that was sized for an automobile.…”

Section: Two-stroke Linear Engine Story and Its Developmentmentioning

confidence: 99%

“…6 shows the difference between the compression ratio and the total output power of the two runs. As a result of eliminating the heat transfer module, the acceleration, the velocity, and the stroke length of the engine were increased.…”

mentioning

confidence: 99%

Numerical simulation for parametric study of a two -stroke compression ignition direct injection linear engine

Shoukry¹

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The Automotive Free-Piston-Turbine Engine

Cited by 13 publications

References 0 publications

A review of free-piston engine history and applications

A review of free-piston engine history and applications

Conceptual analysis of a four -stroke linear engine

Numerical simulation for parametric study of a two -stroke compression ignition direct injection linear engine

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