Heat Radiation Energy Research Articles

Explosion Temperature and Dispersion Characteristics of Composite Charges Based on Different Non‐detonative Materials

The explosion fireball temperature and scattering process of explosive products of annular composite charges were investigated to guide the selection of non-detonative materials with controllable composite charge output. Overpressure sensors, an infrared thermal imager, and a high-velocity photography system were used to compare the explosive fireball temperature, scattering movement, and post-combustion characteristics of composite charges with different non-detonative materials. The fireball temperature distributions of the active non-detonative materials (rubber containing various proportions of aluminum powder) were not uniform, and the heat radiation power, heat flux, and overpressure were relatively high and first decreased and then increased with increasing aluminum powder content. The active non-detonative materials had two high-temperature regions in the lateral direction. Oxygen-free explosions, anaerobic combustion, and post-combustion processes occurred during the energy-release reaction of the composite charges. The temporal evolution of the throwing radius of the explosion products of the composite charges was investigated, and the rate of scattering of the non-detonative materials was analyzed. The rate of scattering was higher than that of an inert non-detonative material (polyurethane) and first increased and then decreased with increasing aluminum powder content. Based on the explosion-proof performance and heat radiation energy output characteristics, rubber containing 50 % aluminum was selected as the optimal non-detonative material.

Analysis of the Optimum Solar Collector Installation Angle from the Viewpoint of Energy Use Patterns

While solar energy is the most efficient energy source for heating, many problems can occur when the capacity selection of the system is wrong: a definite possibility in a place where the seasonal climate change is large, such as Korea. For example, if a system is designed for use in the winter, the system will be overloaded if it does not discard the energy it collects during the summer months. Conversely, if the capacity of the system is in accordance with the summer season demand, it will be necessary to input supplementary energy in the winter season. Solar energy also depends on the altitude and azimuth of the sun, and the amount of energy collected on the slope depends on the latitude of the area in which it is installed. Therefore, this study is divided into investigating the collection energy, heat radiation energy and auxiliary energy input according to the installation angle of the solar collector and the capacity of the heat storage tank according to latitude of the installation area. To this end, we formulate appropriate energy equations. Simulation coding was performed to track the temperature changes in each part. Additionally, we considered the amount of solar energy that can be effectively used, not simply the amount of solar energy collected, by substituting the actual hot water usage schedule.

Early Cancer Locating Method Based on Infrared Functional Imaging

Owing to complexities of human body structure and thermal mechanism, the invivo distribution of abnormal heat source cannot be estimated quantificationally based on human body’s infrared functional imaging.Fourier regularization mathematical processing method was used to identify the relationship between the lesions’ heat radiation energy and visible data through the establishment of physical model for human thermal radiation.Through characteristic information of infrared functional imaging,the distribution and location of human body’s early cancer lesions should be found out exactly. And some exploratory experiments based on simulation materials were conducted to demonstrate the feasibility of this method.

Calculation Research on Infrared Radiation Characteristic on Flying Projectile in Sky-Screen

To improve the detection performance of sky-screen under-low illumination conditions, an infrared detection technology is proposed to design its detection optical system, and the heat infrared radiation energy of a projectile in a detection screen is analyzed and calculated. According to the work principle of sky-screen, the projectile surface heat balance equation is set up by dividing its surface area into many small units when it is passing detection screen; the function relations on heat radiation, velocity, and projectile's length are analyzed, and the calculation method on heat radiation equation is provided. The spectrum radiant intensity, radiant luminance, radiant energy, and output signal of detection circuit are studied. Through calculation and analysis, the result shows that the higher the projectile velocity, the higher the surface temperature and the higher the heat radiation energy; when the obliquities angle of flying projectile is larger, the heat radiation energy will reduce; when the detection screen thickness of sky-screen is equal to the projectile's length, the heat radiation energy that the photoelectric detector gains is the highest; and the farther the detection distance, the lower the heat radiation energy.

Air blast and heat radiation from fuel-rich mixture detonations

Large scale experiments were carried out to study the effect fuel concentration on air blast parameters and heart radiation from gaseous detonations. Hemispheric plastic envelope (4 meters in radius) was used with propane-air mixtures containing from 4 to 7 vol. % of fuel. The expressions for overpressures and impulses were determined in Sachs variables. The effect of fuel concentration on blast parameters is shown to be insignificant for the same amount of oxygen in the mixture volume. Thus the blast wave parameters can be described as for stoichiometric mixtures using additional scaling for the explosion energy according to oxygen content (cloud volume). The results of large scale experiments with fuel spray clouds containing 0.16–100 tons of fuel with mean concentration from stoichiometric (C 0) up to 3C 0 are reconsidered. These results confirm the proposed scaling of air blast parameters for a wide range of fuel types, cloud volumes and fuel concentrations. Detonations of fuel rich gaseous mixtures result in a strong heat radiation. Heat radiation energy, time and size of the fireball formed are studied as a function of fuel concentration.