Your Selections

Rotary engines
Show Only

Collections

File Formats

Content Types

Dates

Sectors

Topics

Authors

Publishers

Affiliations

Committees

Events

Magazine

   This content is not included in your SAE MOBILUS subscription, or you are not logged in.
new

The Szorenyi Three-Chamber Rotary Engine Concept

Partner Rotary Engine Development Agency-Peter King
Published 2019-09-09 by SAE International in United States
Currently automotive engines are reciprocating or Wankel rotary engine types. Reciprocating engines are bulky, heavy and complex, mainly due to the intake and exhaust valves and their associated cam-train. Wankel engines have a low rotor rev limit, and have inefficient sealing of the apex seals leading to poor economy and undesirable emission gases. The Rotary Engine Development Agency (REDA) has designed a new three-chamber rotary internal combustion engine concept using an adaptation of the patented Szorenyi Curve. The new design is an evolution of the design which was the subject of SAE Technical Paper 2017-01-2413 and SAE publication ‘So You Want to Design Engines: UAV Propulsion Systems’. This paper describes the features of the new three-chamber engine concept and includes an analysis of the major shortcomings of the Wankel engine. The Wankel engine’s geometry results in excessive crankshaft deflection at high engine revs due to the centrifugal force of the rotor which is eccentric to the crankshaft. This results in a low rotational speed limit. Analysis of the Wankel design reveals that the rotational speed…
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Misfire Generator Functional Requirements

Vehicle E E System Diagnostic Standards Committee
  • Ground Vehicle Standard
  • J2901_201904
  • Current
Published 2019-04-11 by SAE International in United States
The intent of the specification is to present a functional set of requirements which define the user and hardware interfaces while providing sufficient capability to meet the misfire patterns for compliance demonstration and engineering development. Throughout this requirement, any reference to “ignition or injector control signal” is used interchangeably to infer that the effected spark ignition engine’s ignition control signal or the compression ignition engine’s injector control signal is interrupted, timing phased, or directly passed by the misfire generator. For spark ignition engines, the misfire generator behaves as a spark-defeat device which induces misfires by inhibiting normal ignition coil discharge. It does so by monitoring the vehicle’s ignition timing signals and suspends ignition coil saturation for selected cylinder firing events. The misfire generator will thereby induce engine misfire in spark ignited gasoline internal combustion engines; including rotary engines. For compression ignition engines, the misfire generator behaves as a fuel injection-defeat device which induces misfire by inhibiting the normal fuel injection pulses. It does so by monitoring the injection pulses signal and suspending the injection pulses…
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Testing of a Modern Wankel Rotary Engine - Part I: Experimental Plan, Development of the Software Tools and Measurement Systems

University of Bath-Giovanni Vorraro, Matthew Turner, James W. G. Turner
Published 2019-01-15 by SAE International in United States
Wankel rotary engines are becoming an increasingly popular area of research with regard to their use as a range extender in the next generation of Hybrid Electric Vehicle (HEV). Due to their simple design, lightness, compactness and very favourable power-to-weight ratio, they represent one of the best alternative solutions to classic reciprocating piston engines. On the other hand, current Wankel engines still need improvements in terms of specific fuel consumption and emissions.This paper describes an innovative approach for the assessment of the performance of a modern rotary engine. All the experimental activities will be carried out within the Innovate UK funded ADAPT Intelligent Powertrain project led by Westfield Sportscars Limited. The engine under test is a 225cm3 rotary engine produced by Advanced Innovative Engineering (AIE UK) Ltd. equipped with the patented Compact SPARCS (Self-Pressurising-Air Rotor Cooling System) technology that uses the blow-by gases of the combustion process to improve the heat rejection from the rotor to the liquid coolant.The descriptions of the experimental activities and of the test rig are provided, including the instrumentation, the…
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Mazda details electrification strategy, confirms rotary engine's return

Automotive Engineering: November 2018

Bill Visnic
  • Magazine Article
  • 18AUTP11_06
Published 2018-11-01 by SAE International in United States

In an announcement from Japan in October, Mazda-one of the few established automakers to articulate a comprehensive longterm commitment to hybridization or all-electric vehicle propulsion-said it intends to incorporate some type of electrification in all its vehicles by 2030. Yet in nearly the same virtual breath, the company affirmed its connection to “soulful” forms of internal combustion, including a confirmation that it will renew its longstanding enthusiasm for the rotary engine.

Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Description of a Novel Concentric Rotary Engine

Aristotle University of Thessaloniki-Vasilis Gkoutzamanis, Zissis Samaras
theSARMproject-Savvas Savvakis
Published 2018-04-03 by SAE International in United States
The present work presents the concept of a new rotary engine, and provides first investigations for its implementation in the energy sector. The main focus of this work is to provide a theoretical description of the engine and its differences from the state-of-the-art technologies. Its innovative principle consists of concentric operation, with two pistons of different rotation radius and the addition of a third intermediate chamber between the compression and combustion chamber. A description of the engine’s physical model is provided, followed by an analysis of the selected specific geometrical features. Additionally, a thermodynamic analysis clarifies the operational advantage compared to the existing cycles and, finally, a numerical investigation on the engine’s bulk performance is provided to quantify the anticipated results of the theoretical analysis. The theoretical description concludes that the new rotary engine is characterized by simple design with the minimum possible moving parts that can be easily integrated into hybrid systems or small sized applications. Its anticipated volume and weight is five to six times smaller than that of conventional engines owing to…
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Performance of a Low-Blowby Sealing System for a High Efficiency Rotary Engine

LiquidPiston Inc.-Mark Nickerson, Kyle Becker, Alexander Kopache, Nikolay Shkolnik, Alexander Shkolnik
Université de Sherbrooke-Maxime Leboeuf, Jean-François Dufault, Mathieu Picard
Published 2018-04-03 by SAE International in United States
The X engine is a non-Wankel rotary engine that allies high power density and high efficiency by running a high-pressure Atkinson cycle at high speeds. The X engine overcomes the gas leakage issue of the Wankel engine by using two axially-loaded face seals that directly interface with three stationary radially-loaded apex seals per rotor. The direct-interfacing of the apex and face seals eliminates the need for corner seals of the typical Wankel engine, significantly reducing rotary engine blowby. This paper demonstrates the sealing performance that can be achieved by this new type of seal configuration for a rotary engine based on dynamics models and experiments. The dynamics models calculate the displacement and deformation of the face and apex seals for every crank angle using a time implicit solver. The gas leakage is then calculated from the position of the seals and pressure in the chambers and integrated over a rotor revolution. An “effective leakage orifice” area can be determined, to compare blowby between different engine types. Model results show that the X engine equivalent leakage area…
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Comparison of 1-D Modelling Approaches for Wankel Engine Performance Simulation and Initial Study of the Direct Injection Limitations

Advanced Innovative Engineering UK Ltd-Nathan Bailey
University Of Bath-Michael Peden, Matthew Turner, James W G Turner
Published 2018-04-03 by SAE International in United States
Recent interest in the possible use of Wankel engines as range extenders for electric vehicles has prompted renewed investigations into the concept. While not presently used in the automotive industry, the type is well established in the unmanned aerial vehicles industry, and several innovative approaches to sealing and cooling have recently been developed which may result in improved performance for ground vehicle applications.One such UAV engine is the 225CS, a 225 cc/chamber single-rotor engine manufactured by Advanced Innovative Engineering (UK) Ltd. To be able to analyse the parameters, opportunities and limitations of this type of engine a model was created in the new dedicated Wankel modelling environment of AVL BOOST. For comparison a second model was created using the established method of modelling Wankel engines by specifying an ‘equivalent’ 3-cylinder 4-stroke reciprocating engine. The output from both of these models was evaluated using engine test data supplied by Advanced Innovative Engineering (UK) Ltd. The model created in the dedicated Wankel environment was found to fit the experimental data more closely.The model was then used to…
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

The Development of the Szorenyi Four-Chamber Rotary Engine

Partner, Rotary Engine Development Agency-Peter King
Published 2017-10-08 by SAE International in United States
A four-chamber Otto cycle rotary engine, the Szorenyi Rotary Engine, has been invented and developed by the Rotary Engine Development Agency (REDA) in Melbourne, Australia. The engine concept has been awarded a U.S. Patent (Number 6,718,938 B2).A prototype engine has been constructed and a successful proof-of-concept engine test was achieved in 2008.The stator of the Szorenyi engine is a similar shape to a Wankel engine. However, the geometric shape of the engine rotor is a rhombus, which deforms as it rotates inside the contour of the mathematically defined stator. This geometry translates to a rotary engine with four combustion chambers. Each revolution of the crankshaft produces one revolution of the rotor; a complete engine cycle in each of the four chambers; and therefore four power strokes. In contrast, the Wankel engine produces one power stroke per crankshaft revolution. Additionally, the Wankel engine is rev limited due to the excessive crankshaft bending resulting from the centrifugal forces of the eccentric rotor. The Szorenyi engine has a balanced rotor and so is not rev limited in this…
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

EDITORIAL: Question mark or exclamation point?

Automotive Engineering: February 2017

Editorial Director-Bill Visnic
  • Magazine Article
  • 17AUTP02_05
Published 2017-02-01 by SAE International in United States

Editor-in-chief Lindsay's Brooke's illuminating account of the production-readiness of the Achates Power opposed-piston engine (see p. 16) seems an appropriate kind of punctuation mark for the auto industry's current state of developmental and political flux.

Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Endurance Testing for Wankel Rotary Engine

Ganesh Liladhar Yewale, Abhishek Tapkire, D Radhakrishna, Popat Shejwal, Kaushal Singh, Gaurav Panchal
Published 2017-01-10 by SAE International in United States
VRDE has developed Wankel type rotary engine to achieve high power output & fuel efficiency for indigenization programme of UAVs. This engine is meeting all performance parameters needed for intended aerial vehicle. This paper describes the testing methodology followed by development engineers to prove the endurance and reliability of UAV engine for airworthiness certification. This paper gives the brief about testing carried out on the Wankel engine, failures faced during endurance testing and their rectification to enhance the life of the engine to achieve hundred test cycle mark. This paper also briefs about the test set up, endurance test cycles simulating the practical operating conditions.
Annotation ability available