This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
The Design of a Double Helical Screw Internal Combustion Engine
Annotation ability available
Sector:
Language:
English
Abstract
Theoretical thermodynamic analysis reveals that, when a fixed amount of heat energy is added into an Otto cycle the thermal efficiency of that cycle can be substantially improved by increasing the expansion ratio while keeping the compression ratio unchanged to achieve a greater net work output. As such, to maximise the cycle work output, the exhaust gas is allowed to expand to atmospheric pressure within the power machinery itself. With this approach, the pressure versus specific volume diagram of this modified cycle at exhaust valve opening is thus minimised and hence waste heat recovery/utilisation such as the implementation of turbocharging system can be eliminated.
This paper presents the development and design considerations of a double helical screw internal combustion engine. The engine consists of two pairs of helical screw type, positive displacement machines in which one pair performs the operation of compressing the working fluid, while the other performs the operation of expansion. The machines, being separate, could be designed in such a way that the effective gas expansion ratio is greater than the compression ratio.
Recommended Content
Citation
Chan, S. and Goh, S., "The Design of a Double Helical Screw Internal Combustion Engine," SAE Technical Paper 970064, 1997, https://doi.org/10.4271/970064.Also In
References
- Yamamoto, K. 1981 Rotary Engine Sankaido Co. Ltd. Tokyo
- Shinga, S. et al 1996 Effect of Early Closing of Intake Valve on the Engine Performance in a Spark Ignition Engine SAE Technical Paper 960585
- Ueda, N. et al 1996 A Naturally Aspirated Miller Cycle Gasoline Engine - its Capability of Emission, Power and Fuel Economy SAE Technical Paper 960589
- Okamoto, K. et al 1996 Study on Miller Cycle Engine for Co-generation Systems - Effect of Miller Cycle on the Performance of Gas Engine SAE Technical Paper 960949
- Newton, K. Steeds, W. Garret, T. K. 1989 The Motor Vehicle 11th Butterworths, UK
- Chisolm, I. 1984 Automobile Engine and Vehicle Technology McGraw Hill Book Co. London
- Peacock, F. E. Gaston, T. 1980 Automotive Engine Fundamentals Reston Publishing Co. Inc. Reston, USA
- Cummins, C. L. 1989 Internal Fire Society of Automotive Engineers Warrendale, USA
- Luria, D. Taitel, Y. Stotler, A. 1982 The Otto-Atkinson Engine - a New Concept in Automotive Economy SAE Technical Paper 820352
- Saunders, R. J. 1984 Atkinson Cycle Spark Ignition Engines International Journal of Vehicle Design, IAVD Congress on Vehicle Design & Components
- Setright, L. J. K. 1975 Some Unusual Engines Mechanical Engineering Publications Ltd. London