Unstretched laminar burning velocities under the influence of electric fields and their associated Markstein length scales have been determined from outwardly propÂagating spherical flame at a constant pressure. The thesis comprises effects of electric fields on a fundamental study of spheriÂcal premixed flame propagation.Outwardly-propagating spherical laminar premixed flames have been investigated in a constant volume combustion vessel by applying au uni-directional electric potential.Direct photography and schlieren techniques have been adopted and captured images were analyzed through image processing. The article shows the influence of the normal combustion rate on the average flame propagation velocity in the third combustion phase.Įffect of Electric Field on Outwardly Propagating Spherical Flame The dependences of the turbulent propagation velocity of the flame front in the second combustion phase on the composition of the mixture and operating modes. The article shows the influence of hydrogen addition on the average velocity propagation of the flame front in the main combustion phase. Experimental studies were carried out on a single-cylinder gasoline engine UIT-85 with hydrogen additives up to 6% of the mass of fuel. The paper presents models for calculating the average velocity of propagation of the flame front, obtained from the results of experimental studies. Modelling the average velocity of propagation of the flame front in a gasoline engine with hydrogen additives Results provide characterisation of the toroidal vortex/ flame front interaction for a range of vortex scales of and recirculation strengths. High speed laser sheet visualisation was employed to record the flow field and flame front temporal development and high-speed digital particle image velocimetry was used to quantify the velocity field of the unburnt mixture ahead of the flame front. A novel twin section combustion chamber has been utilised to allow the controlled formation of stable eddy structures into which a flame front can propagate. Long, E J Hargrave, G K Jarvis, S Justham, T Halliwell, N [Wolfson School of Mechanical and Manufacturing Engineering, Loughborough University, Loughborough, Leicestershire, LE11 3TU (United Kingdom)Įxperimental laser diagnostic data is presented for flame characterisation during interactions with toroidal vortices generated in the wake of an annular obstacle. Results provide characterisation of the toroidal vortex/ flame front interaction for a range of vortex scales of and recirculation strengthsĮnergy Technology Data Exchange (ETDEWEB) Long, E J Hargrave, G K Jarvis, S Justham, T Halliwell, NĮxperimental laser diagnostic data is presented for flame characterisation during interactions with toroidal vortices generated in the wake of an annular obstacle. International Nuclear Information System (INIS) These solutions help to investigate analytically and numerically properties of the flame front propagation equations.Ĭharacterisation of the Interaction between Toroidal Vortex Structures and Flame Front Propagation Instead of complex equations, a finite set of ordinary differential equations is applied. Premixed flames and filtration combustion have remarkable properties: the complex nonlinear integro-differential equations for these problems have exact analytical solutions described by the motion of poles in a complex plane. Pole solutions for flame front propagation are developed. New original mathematical methods for solving complex non-linear equations and investigating their properties are presented. This book deals with solving mathematically the unsteady flame propagation equations. Pole solutions for flame front propagation
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