Abstract
AbstractNumerical experiments for diagnosis of combustion of actual heterogeneous systems are performed on a one-dimensional chain. The internal microstructure of actual heterogeneous systems is apriori unknown, various distributions like uniform, beta, and normal have been considered for distributing neighboring reaction cells. Two cases, for the nature of distribution of heat release of reaction cells are taken into account, one with identical heat release and the other with disordered heat release. Role of different random distributions in describing heterogeneous combustion process is established in present paper. Particularly, the normal distribution of arranging neighboring reaction cells has been found to be powerful methodology in explaining the combustion process of an actual heterogeneous system at higher ignition temperatures for both cases of distributing heat release. Validation of the developed model with the experimental data of combustion of the CMDB propellants, gasless Ti + xSi system, a...
Highlights
Our results show that the normal distribution of arranging neighboring reaction cells can be the powerful methodology in explaining the combustion process of an actual heterogeneous system
As demonstrated in Bharath et al (2013), Rashkovskii (2005), and Rashkovskiy et al (2010), the one-dimensional study of heterogeneous combustion process can still explain the role of different physical parameters if the particles are considered of point size
The reactions at higher ignition temperatures become complex and in such situations minute changes in internal microstructure can play a crucial role in affecting combustion process
Summary
Combustion of powdered mixtures (Beckstead & McCarty, 1982; Bharath, Rashkovskiy, Tewari, & Gundawar, 2013; Denisyuk, shabalin, & Shepelev, 1998; Dvoryankin, Strunina, & Merzhanov, 1985; Kubota, 1978, 2002; Kubota & Okuhara, 1989; Kulkarni & Sharma, 1998; Rashkovskii, 2005; Rashkovskiy, Kumar, & Tewari, 2010; Rogachev & Baras, 2009) and burning of solid propellants, liquid droplet combustion, spray combustion, combustion of coal, and engines are the examples of heterogeneous combustion. The role of internal microstructure and consumption of reactant (distribution of heat release) in combustion process became apparent after numerical (Bharath et al, 2013; Rashkovskiy et al, 2010) and experimental studies using high-speed micro video camera. As demonstrated in Bharath et al (2013), Rashkovskii (2005), and Rashkovskiy et al (2010), the one-dimensional study of heterogeneous combustion process can still explain the role of different physical parameters (internal micro structure, heat release, burn rate, disordereness) if the particles are considered of point size. The combustion process for such systems (disordered spacing of reaction cells) takes place nonuniformly in oscillating mode (see Bharath et al, 2013; Rashkovskiy et al, 2010); average burn rate is considered.
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