Lean approach observations

The early experiments of Bowman and Seery appeared to confirm this conclusion. Some of their results are shown in Fig. 8.3. In this figure the experimental points compared very well with the analytical calculations based on the Zeldovich mechanisms alone. The same computational program as that of Martenay [11] was used. Figure 8.3 also depicts another result frequently observed fuel-rich systems approach NO equilibrium much faster than do fuel-lean systems [12]. 

To simulate the likelihood function for employing the Bayesian approach it was necessary to choose a reasonable range for the uniform prior distribution of the mean lifetime tx. A minimum of 0.1 seconds was safe, taking into account the time distribution of the 14 decay events. The maximal tx leaned upon the total effective production cross section of s.f. nuclei, which was measured in physical experiments. Obviously, 14 decays in 0.7 seconds with the upper tx should not correspond to many more events than was the observed total. 

The instability caused by HD and DD phenomena is often observed in lab-scale experiments with hydrogen + air mixtures. Photographs of a spherical flame in mixtures containing 10% and 50% hydrogen [2, 34] denote a smooth combustion front in the rich mixture and a cellular front in the lean mixture. In closed combustion chambers the perturbation of the flame front increases due to the impact of pressure waves reflected from the walls [35, 36]. In quick-burning mixtures a hedgehog -like structure of the front appears when the flame approaches the walls. 

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