Advanced Combustion Science by K. Ohtake (auth.), Professor Tsuneo Someya (eds.)

By K. Ohtake (auth.), Professor Tsuneo Someya (eds.)

Non-uniform combustion, as encountered in diesel and gasoline turbine engines, furnaces, and boilers, is liable for the conversion of fossil gas to power and likewise for the corresponding formation of pollution. regardless of nice examine efforts long ago, the mechanism of non-uniform combustion has remained much less explored than that of different combustion varieties, because it includes many, more often than not temporary techniques which impression one another. In view of this heritage, a gaggle study undertaking, "Exploration of Combustion Mechanism", was once validated to discover the mechanism of combustion, specifically that of diffusive combustion, and in addition to discover effective how one can keep an eye on the combustion technique for greater usage of gas and the relief of pollutant emission. the crowd examine used to be begun, after preparatory job of two years, in April 1988, for a interval of three years, as a undertaking with a Grant-in-Aid for clinical learn of precedence quarter sponsored by means of the Ministry of schooling, technology and tradition of Japan. the full crew of forty three participants was once arrange as an organizing committee of thirteen individuals, and 5 learn teams, along with 36 participants. The study teams have been: (1) regular combustion, (2) Unsteady spray combustion, (3) keep an eye on of combustion, (4) Chemistry of combustion, and (5) results of fuels. first and foremost of the venture it used to be agreed that we must always pursue the mechanism of combustion from a systematic point of view, particularly, the objective of the venture was once to acquire the basics, or "know why", instead of "know how" of combustion.

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25 Laser tomography image for flow with flame larger than that of the original fine particles. It can be seen clearly that when there is no flame the both particles contained in the oxidizer and fuel flows can reach the stagnation plane. These apparent large particles may be formed by some agglomeration processes when the flows pass through the respective pores of porous plates at the nozzle exits. When the flame was established, There appeared a dark strip in the center parallel to the nozzle exit planes.

2 Effect of Surrounding Gas Motion on Turbulent Diffusion flames 21 15~--------~------~ ~ ID -15 Fig. = \10=54 10 C! 3 C! 20m/s = 18. 2 5 0 VO o -5 -10 -15 -20 -15 Xc::) . 'I, -10 -5 0 1110 10 15 Fig. 2 temperature region is located below the jet axis. The formation of attached vortices is likely to result in the well-mixed region of the kidney shape in the wake of the flame where the chemical reaction proceeds very actively and consequently the flame temperature is rather high. It is also evident that the decrease in a velocity ratio makes the high temperature region move up to approach the axis of jet flame.

0+ N2 - N + NO N + O2 - 0 + NO where the fust reaction is rate determining. 5'10-6 at T=2000K This indicates that the time scale for NOx formation is between 5 and 6 orders of magnitude slower than the time scale of oxidation in the characteristic range of combustion temperatures. These chemical time scales must be compared to the time scales of turbulence. Many numerical calculations of turbulent reacting flows are nowadays being based on k-£type models, and Favre-averaging is being used to account for strong density changes due to combustion.

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