A numerical study of a rotary valve internal combustion engine

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dc.contributor Horrocks, Glenn David en_AU
dc.date.accessioned 2007-03-14T01:52:31Z
dc.date.accessioned 2012-12-15T03:52:20Z
dc.date.available 2007-03-14T01:52:31Z
dc.date.available 2012-12-15T03:52:20Z
dc.date.issued 2001
dc.identifier.uri http://hdl.handle.net/2100/248
dc.identifier.uri http://hdl.handle.net/10453/20133
dc.description University of Technology, Sydney. Faculty of Engineering. en_AU
dc.description.abstract A Computational Fluid Dynamics (CFD) simulation of the Bishop Rotary Valve (BRV) engine is developed. The simulation used an existing commercial CFD code, CFX 4.3, with a number of new routines written to allow it to simulate the conditions and motions involved in an internal combustion engine. The code is extensively validated using results from other researchers, and several new validations are performed to directly validate the code for simulating internal combustion engine flows. Firstly, tumble vortex breakdown during the compression stroke of a square piston model engine is modelled. The results of the simulation are validated against published high quality experimental data. Both two- and three-dimensional models are tested, using the k-e and Reynolds stress turbulence models. The Reynolds stress turbulence model simulations successfully predicted the tumble break down process during the compression stroke. A simple three-dimensional Large Eddy Simulation model is also presented. The numerical simulation is then applied to the BRV engine. An in-cylinder flow field not previously described is discovered, created by the unique combustion chamber shape of the BRV engine. The flow field is not adequately described by the traditional descriptions of engine flows, being squish, swirl and tumble. The new flow structure is named 'dual cross tumble', and is characterised by two counter-rotating vortices in the cross tumble plane on either side of the inlet air jet. Analysis of the dual tumble structure indicates that it is most beneficial in high bore to stroke ratio engines. This flow structure has been predicted or visualised by a small number of previous researchers, however no published research has recognised its significance or potential benefits. The validated code is then used to predict the effect of modifying the valve cross sectional area, the effect of the inlet manifold wave, the effect of heat transfer from the inlet manifold walls, the effect of bore to stroke ratio, and the effect of engine speed. This work presents a numerical simulation of a new rotary valve engine technology. This opens up a whole new area of engine aerodynamics research as no detailed examination of the flows in a rotary valve engine have been presented previously. In the process, it discovers a new compression stroke turbulence generation mechanism, 'dual cross tumble', which offers the potential of performance levels not possible using poppet valve engines. en_AU
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dc.format.mimetype application/pdf
dc.language en en_AU
dc.language.iso en_AU
dc.rights http://www.lib.uts.edu.au/disclaimer.html en_AU
dc.rights Copyright Glenn Horrocks en_AU
dc.subject Internal combustion engines. en_AU
dc.subject Mathematical models. en_AU
dc.subject Fluid dynamics. en_AU
dc.subject Valves. en_AU
dc.subject Design and construction. en_AU
dc.title A numerical study of a rotary valve internal combustion engine en_AU
dc.type Thesis (PhD) en_AU
utslib.copyright.status Open Access

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