Comparison of Piston Concept Design Solutions for Composite Cycle Engines Part I: Similarity Considerations

[+] Author and Article Information
Dimitrios Chatzianagnostou

Research Assistant, Institute of Aircraft Propulsion Systems, University of Stuttgart, Stuttgart 70569, Germany

Stephan Staudacher

Director, Institute of Aircraft Propulsion Systems, University of Stuttgart, Stuttgart 70569, Germany

1Corresponding author.

ASME doi:10.1115/1.4039704 History: Received July 14, 2017; Revised February 16, 2018


Composite cycle engines comprising piston engines as well as piston compressors to achieve hecto pressure ratios represent a target area of current research surpassing gas turbine efficiency. An unclear broad range of design parameters is existing to describe the design space of piston machines for this type of engine architecture. Previously published work focuses on thermodynamic studies only partially considering limitations of the design space. To untie the problem of piston engine design, a dimensional analysis is carried out reducing the number of parameters and deriving two basic similarity relations. The first one is a function of the mean effective pressure as well as the operating mode and is a direct result from the thermodynamic cycle. The second one is constituted of the stroke-to-bore ratio and the ratio of effective power to piston surface. Similarity relations regarding the piston compressor design are based on Grabow [1]. A further correlation for piston compressors is based on the specific compression work and the piston speed. In Part I data of existing piston engines have been subjected to the above similarity parameters unveilling the state of the art design space. This allows a first discussion of current technological constraints. Applying this result to the composite cycle engine gives the design space and a first classification as a low-speed engine. Investigating various design points in terms of number and discplacement volume of cylinders confirms the engine speed classification. Part II will expand this investigation using preliminary design studies.

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