Browse Publications Technical Papers 2013-01-0284

Design and Operational Characteristics of a Novel Floating-Stroke, Free Piston Internal Combustion Reciprocating Engine 2013-01-0284

A floating-stroke, free-piston internal combustion reciprocating engine (FS-FPE) is currently under development with the primary goal of high engine efficiency, along with ultra-low emissions. High compression ratio, boosted, lean operation is targeted with kinetically-modulated combustion expected to be utilized as a principal mode of operation. To aid the engine's preliminary design stage modeling is conducted in order to explore the engine's operational characteristics and charge conditioning needs. Natural gas and gasoline are considered as potential fuels. A single-zone, homogeneous reactor model (HRM) is employed to approximate the in-cylinder processes, especially the ignition chemistry (timing) which is important for operation under these conditions. Sub-models are integrated into the HRM to describe fuel evaporation, heat transfer, and piston crevice / ringpack flows. A range of operating parameters is explored including fuel loadings (ϕ = 0.25 to 0.55), piston speeds (1200 to 4800 cycles per minute), intake pressures (p = 0.5 to 2.0 bar), and intake temperatures (T = −60 to 130C). The engine design and results of this modeling study are presented here.


Subscribers can view annotate, and download all of SAE's content. Learn More »


Members save up to 40% off list price.
Login to see discount.
Special Offer: With TechSelect, you decide what SAE Technical Papers you need, when you need them, and how much you want to pay.