Dear Colleagues,

Internal combustion engines (ICEs) have made major contributions to the world’s economic, environmental and social growth. Development in engines should be towards high durability, high efficiency, high pressure, miniaturization and easier manufacturing. Some non-piston type engines have recently been developed with compact, smaller volume and lightweight structure design. These non-piston engines are also potential alternatives as green engines using hydrogen fuel. The non-piston type engines such as rotary engines encounter some challenging issues, which include the sealing, combustion efficiency, compression ratio, and thermal and fluid effects, while structure strength should be improved to meet the energy-saving requirement. If these issues can be addressed and solved, then the rotary engines can be widely applied in various engineering applications.

With the rapid advancement of energy-saving technologies, academics and industries are focusing their attention on the flow field inside the combustion chamber of ICEs using commercial software in order to investigate the impact of many parameters on the engine's performance. The design of the engine chambers has been invented to be one of the main features of enhancement prospects, while engine simulation and performance prediction are still limited. The primary goal of ICE development today, is to examine the fluid flow, dynamics and dynamic behaviour of engines in order to improve combustion efficiency and overcome the sealing issues.

The present Special Issue of non-piston type engines aims to gather innovative research and include some of the latest developments on internal combustion engines. More specifically, topics of interest for the Special Issue include (but are not limited to):

• Design and development of engines;
• Kinematics of engines;
• Multibody dynamics of engines;
• Multi-dimensional computational fluid dynamics (CFD);
• Fluid flow analysis of engines;
• Combustion analysis of engines;
• Fluid dynamic processes in engines;
• Leakage and streamlines analysis;
• Effects of engine structure design on performance;
• Effect of alternative fuels on engine performance and efficiency;
• Experimental design method and analysis in engines;

Prof. Dr. Chiu-Fan Hsieh
Guest Editor

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

• engine design
• engine development
• CFD analysis
• combustion efficiency
• fluid flow
• engine leakage