Increasing the efficiency of rotary piston engines by the use of the diesel cycle


The article deals with the task of increasing the efficiency of rotary piston engines by implementing an economical diesel cycle in a module with a three-arc epitrochoid and an external gearing kinematics scheme. The necessity of the diesel cycle is caused by the need of reducing specific fuel consumption in rotary piston engines that are currently widely used in light aviation, mostly for remotely piloted aircraft. The Wankel rotary piston engine with a two-arc epitrochoid, though having a number of advantages over traditional piston engines, is inferior to them in efficiency, particularly in partial load modes. The implementation of the diesel cycle in а cycloidal piston engine with a three-arc epitrochoid makes it possible to reduce specific fuel consumption by 30% while retaining the listed positive qualities, as well as to use diesel fuel which is preferable for high-altitude aircraft due to lesser tendency to gas formation in pipelines. The engine stator inner loop is made up by three arcs of the epitrochoid that form three working chambers equally-spaced along the perimeter, which provides a decrease of the stator thermal deformation during the operation of the engine. A method is developed to determine the geometric parameters of a rotary piston engine with a three-arc epitrochoid, and design work is carried out in the КОМPAS-3D code for a 50 h. p. diesel engine to be used in light aviation and as a drive of electrical generators, pumps and compressors for ground application.

About the authors

V. V. Okorochkov

«Kuznetsov» public company

Author for correspondence.

Head of Piston Engine Department

Russian Federation

V. M. Okorochkova

Samara National Research University


Candidate of Science (Engineering)
Associate Professor of the Department of Aircraft Engine Theory

Russian Federation

A. I. Ravodin

«Kuznetsov» public company



Russian Federation


  1. Okorochkov V.V., Okorochkova V.M., Shafranov V.V. Significance and directions of development of rotary piston area of research. Vestnik of the Samara State Aerospace University. 2014. No. 5 (47), part 3. P. 82-91. (In Russ.)
  2. Beniovich V.S., Apazidi G.D., Boyko A.M. Rotoporshnevye dvigateli [Rotary piston engines]. Мoscow: Mashinostoyeniye Publ., 1968. 151 р.
  3. Yamamoto K. Rotary Engine. Tokyo, Japan: Published by Sankaido CO Ltd, 1981. 67 p.



Abstract: 2891

PDF (Russian): 1560




  • There are currently no refbacks.

Copyright (c) 2017 VESTNIK of Samara University. Aerospace and Mechanical Engineering

This website uses cookies

You consent to our cookies if you continue to use our website.

About Cookies