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CFD RESEARCH OF COMBINATION FORMATION, FLOW AND BURNING FOR MULTI-FUEL ROTARY ENGINE Von jeder Fakultät für Maschinenbau, Elektrotechnik and WirtschaftsIngenieurwesen der Brandenburgischen Technischen Universität Cottbus

zur Erlangung des akademischen Marks eines Doktor-Ingenieurs (Dr. -Ing. ) genehmigte Dissertation vorgelegt von Grasp of Technology Husni Taher Izweik Geboren am 15. 12. 1954 in Zawia, Libyen

Vorsitzender: Gutachter: Gutachter:

Prof. Doctor -Ing. L. Steinberg Prof. Dr . -Ing. H. G. Berg Prof. Dr . Electronic. Sigmund 18. 11. 2009

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Highly effective, smooth, compact and light coupled with multi-fuel capability are the key features of the rotary engine. The Wankel engine exceptional power-to-weight ratio and stability make it does not only suitable to get automobile software, but also particularly suitable to airplane engine make use of and it can replace the reciprocating piston engine in many regions of use just like sport cars, motorcycle, vessels, and tiny power generation units etc . Since the physics that happening inside Wankel engine burning chambers happen to be exceedingly sophisticated, a statistical CFD studies were received to understand the unsteady, multidimensional fluid stream and fuel-air mixing within the combustion step of the Wankel rotary engine during the absorption and compression cycles. The effects of the engine combustion chamber design and operating variables on smooth flow and fuel-air mixture formation were investigated: engine velocity, direction of fuel injection in the combustion chamber, with stress on diesel powered and hydrogen injection fuels. The injector nozzle size, injected gas velocity, the position of injector and viewpoint of injection were also investigated. A well known CFD Code AVL-Fire v7. times and v8. x having its moving mesh capability utilized to replicate one disc side, delivering the intake and compression stroke. The CFD-Code has the ability to of simulating the complicated movement in the rotor and calculates the fluid movement parameters; heat, pressure, velocity, volume changes and combustable variables. The k-Оµ unit is the most widely used turbulence version in sensible engineering applications and was used by the code to determine the movement variables. A number of ignition and combustion models available by this code which include: eddy separation or magnussen model, logical flame (CFM) model, PDF FORMAT model, and TFSC version. The fire combustable module enables the calculations of species transport/mixing phenomena and the ruse of combustion in inside combustion search engines and technological combustion gadgets under premixed, partially premixed or a non-premixed conditions. In combination with fire spray model, the combustion module enables the calculation of spray burning process in direct shot engines; where mixture creation and burning are coexisting process exhibiting a significant level of interaction and interdependence. The droplet break up models available with suitably modified model variables are highly suggested for this kind of application.

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In previous work done by Fushui Liu [1], through this chair of combustion search engines and air travel propulsion, at BTU-Cottbus, the fireplace code have been validated and approved to get high velocity gas injection of hydrogen and it will help to choose and adjust the various model variables for hydrogen injection. A geometrical data of a fresh family of small, lightweight Wankel engine intended for multipurpose applications were designed and are currently under an optimization test utilized in this study. In the initial part of this research simulation work, concentration on understanding the circulation field within the combustion chamber is a a part of this research work to help understanding engine gasoline injection construction. The engine is capable of burning different kind of liquid and gas fuels.

The diesel fuel is considered the most extreme liquid fuel plus more complicated when compared...

References: AVL Fire, Varieties transport, Type 8, July2003. Loyd, 3rd there’s r., Curtiss-Wright Corp., R. C. Engine Department. Wood-Ridge. N. J. 07075,

Curtiss-Wright Stratified Charge Rotary Engine Advancement, Combustion Research and