Numerical Simulation Of Combustion Flow Field In Plasma Generator

As a kind of generating mechanical powers, Gas turbin at present is widely used in aviation,electyic power stations and natural-gas transportation petroleum,railway and shipbuilding industry.Combustor is an important component in the gas turbine.During the startup ,it is important to realize the combustor ignited reliably. Plasma ignition for engine is a new pattern portfire, it firstly lights up the start-up oil and form ignition torch to ignite the main oli in the combustor.lt is a new technolygy,at the present only Ukraine have used this technique in marine gas turbine and the ground gas turbine to increase the reliability of retro fires and extend the concentration limit of retro fires. There are much complicated and exquisite physical and chemical processes when the oil and the air been mixed.For some theories of the combustion are not clear and the differential eguations are so complicated,it is very difficlut to get the accurate flow field distribution.So it limits the combustion theory to design conbustion equipment.With the rapid development of computational fluid dynamics and combustion theory, applying the computer to numerically simulate the complicated processes in the plasma ignition is possible.Using numerical simulation can estimate the parameters which are not essay to measure and not doing so many experiments can improve its reliability and reduce the cost.So numerical simulation is a new pattern way to study the inner mechanism of the plasma ignition.In this article, constituting some the equations which reflect the flow law and building and applying many mathematical models of physical and chemical reactions in the the plasma ignition:applying k-ξ two equations turbulence model to calculate the turbulence parameter supplying simplied reaction systerm model and applying eddy break-up model and p-I thermal radiation model.With these reasonable simplied modles,numerically simulating the flow field in the plasma ignition.During the numerical simulation,applying the body-fitted coordinates for the complex geometry ofthe computional field;using the mixing format to disperse the equations;applying SIMPLEC algorithm method to solve the equations; using above models and methods,it can get flow field distribution;including temperature,pressure,turbulent kinetic energy and its dissipation rate,turbulent viscosity, velocity, density. These results are significant to design and improve the plasma ignition.