Modeling the Novel Jones Engine Toroidal Concept in Homogeneous Charge Compression Ignition (HCCI) and Spark Ignition (SI) Combustion Model PDF Download

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Category : Homogeneous charge compression ignition engines
Languages : en
Pages : 112

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Book Description
The need for reduced CO2 emissions from transportation and stationary power generation applications has driven engine designers, developers, and researchers to seek new and novel technologies and designs to maximize engine efficiency, reduce weight, and increase engine performance. One such new engine design was proposed by Jones Engine LLC, and called the Jones Engine. The Jones Engine concept utilizes a novel toroidal piston/cylinder configuration, eliminating the connecting rod of the traditional slider-crank mechanism, thereby allowing for a more direct transfer of work from the combustion gases to the crankshaft. Jones Engine LLC promises significantly increase output torque, reduced fuel economy, and decreased engine weight through its unique design. This work seeks to model the Jones Engine's unique engine cycle, and directly compare to analogous conventional reciprocating slider-crank engines to provide an assessment of the benefits and limitations of the Jones Engine concept. In this work, the Jones Engine concept was modeled via a MATLAB based 0-D engine simulation code developed by the authors, utilizing Cantera to solve the gas phase chemical kinetics. The engine was modeled in two combustion modes, Homogeneous Charge Compession Ignition (HCCI), and Spark-Ignited (SI). The HCCI combustion model utilized a homogeneous single-zone incorporating the effects of piston motion, heat transfer, and gas phase kinetics, while the SI combustion model utilized a 2-zone modeling approach with either a prescribed Wiebe function heat release, or a semi-predictive flame propagation model. The engine models were validated against experimental data from conventional engines available in the literature. The results of the simulations showed that at identical engine operating conditions and analogous geometrics, the Jones offered slightly reduced efficiency in HCCI and SI combustion modes, but with significantly higher output torque due to the nature of the Jones Engine mechanism. However, the simulation results indicated several potential benefits of the Jones Engine configuration, including increased knock mitigatation in SI mode, and therefore the ability to operate with significantly higher geometric compression ratios, thereby offering higher efficiency potential.