Thermal radiation of heterogeneous combustion products at the nozzle exit of the rocket microengine

2016 ◽  
Vol 59 (4) ◽  
pp. 579-586
Author(s):  
V. A. Kuz’min ◽  
E. I. Maratkanova ◽  
I. A. Zagrai ◽  
R. V. Rukavishnikova
2019 ◽  
Vol 140 ◽  
pp. 08012
Author(s):  
Yana Penner ◽  
Vyacheslav Yakovlev ◽  
Nikita Popov ◽  
Margarita Antonova ◽  
Anatolijs Borodiņecs

In the modern world, it is especially important to provide the population and industries with energy, which is necessary to maintain a consistently high quality of life. Often, the process of generating energy is associated with a certain risk to personnel and the public when using various types of fuel, often with fire hazardous properties. For each fire damaging factor, for example, for thermal radiation, toxicity of combustion products, smoke, and elevated temperature, the probability of human injury can be calculated. In this paper, the probability of a person being damaged by thermal radiation in a fire spilling a fuel-air mixture is calculated. A spill fire begins by igniting the vapors of spilled hydrocarbon fuel on an open surface. The calculation was carried out according to three methods, one of which takes into account the movement of a person away from the epicenter of the fire. The dependence of the heat flux density on the distance from the center of the fire is given. Based on calculations of the safe distance from the center of the fire and the values of thermal radiation using the Matlab software environment, the optimal method for determining the probability of human injury in case of a fire spill of an oil product was selected, and it was also concluded that it can be used in case of using high-energy fuel.


1963 ◽  
Vol 13 (11) ◽  
pp. 506-509
Author(s):  
A. Fish ◽  
N. H. Franklin ◽  
R. T. Pollard
Keyword(s):  

Author(s):  
Ahmed M Abdel-Ghanya ◽  
Ibrahim M Al-Helal

Plastic nets are extensively used for shading purposes in arid regions such as in the Arabian Peninsula. Quantifying the convection exchange with shading net and understanding the mechanisms (free, mixed and forced) of convection are essential for analyzing energy exchange with shading nets. Unlike solar and thermal radiation, the convective energy, convective heat transfer coefficient and the nature of convection have never been theoretically estimated or experimentally measured for plastic nets under arid conditions. In this study, the convected heat exchanges with different plastic nets were quantified based on an energy balance applied to the nets under outdoor natural conditions. Therefore, each net was tacked onto a wooden frame, fixed horizontally at 1.5-m height over the floor. The downward and upward solar and thermal radiation fluxes were measured below and above each net on sunny days; also the wind speed over the net, and the net and air temperatures were measured, simultaneously. Nets with different porosities, colors and texture structures were used for the study. The short and long wave’s radiative properties of the nets were pre-determined in previous studies to be used. Re and Gr numbers were determined and used to characterize the convection mechanism over each net. The results showed that forced and mixed convection are the dominant modes existing over the nets during most of the day and night times. The nature of convection over nets depends mainly on the wind speed, net-air temperature difference and texture shape of the net rather than its color and its porosity.


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