Abstract
With the increase of fire in high-rise buildings in recent years, the demand for high-performance Water Tower Fire Truck (WTFT) is increasing day by day. In order to improve the injection capacity of ultrafine dry powder of the WTFT, this article adopts the way of adding blow-assisted pipe to realize nitrogen-assisted blowing, and the internal flow field of existing blow-assisted pipe was analyzed and optimized by CFD simulation. The influence law of size parameters on the mass flow rate and velocity of ultrafine dry powder and nitrogen was analyzed and summarized under different inlet pressure conditions. The optimization result is that the diameter of the nitrogen-assisted blowing pipe is increased between 10 mm and 20 mm, the diameter of the outlet pipe is 32 mm, and the diameter of the inlet of the mixing pipe is 90 mm.
Highlights
IntroductionWith the rapid development of the economy and the acceleration of urbanization, there are more and more fires in high-rise buildings, large buildings, and chemical enterprises. is kind of building fire has the characteristics of high fire location, large fire intensity, and great difficulty in extinguishing, and its fire safety should not be underestimated [1]
With the rapid development of the economy and the acceleration of urbanization, there are more and more fires in high-rise buildings, large buildings, and chemical enterprises. is kind of building fire has the characteristics of high fire location, large fire intensity, and great difficulty in extinguishing, and its fire safety should not be underestimated [1].Aiming at this kind of building fire, the Water Tower Fire Truck (WTFT) with the function of fire extinguishing agent injection has been paid more and more attention
It could be seen from the figures that the increasing the diameter of the outlet pipe makes the distribution of the ultrafine dry powder in the outlet pipe more uniform, and the velocity in the mixing pipe is obviously improved, and the velocity in the remaining areas has been improved to a certain extent. e increase in the velocity of ultrafine dry powder in the pipeline causes a certain range of area with lower ultrafine dry powder content around the elbow of the nitrogen-assisted blowing pipe, and this area increases with the increase in the diameter of the outlet pipe
Summary
With the rapid development of the economy and the acceleration of urbanization, there are more and more fires in high-rise buildings, large buildings, and chemical enterprises. is kind of building fire has the characteristics of high fire location, large fire intensity, and great difficulty in extinguishing, and its fire safety should not be underestimated [1]. In order to improve the overall injection capacity of ultrafine dry powder, two schemes are considered: one is to increase the pressure of nitrogen in the ultrafine dry powder storage tank and the other is to add blow-assisted pipe. In the process of recycling, the ultrafine dry powder will absorb moisture in the air, and it is easy to cause pipe blockage after repeated tests It takes massive manpower and financial resources to dredge the pipeline and purchase a large amount of ultrafine dry powder, so the more economical and convenient computer numerical simulation method is considered to continue the research. CFD simulation analysis can avoid the ultrafine dry powder dampness caused by repeated experiments, strictly control the single variables, and obtain the flow characteristics of the mixed flow field in the pipeline more conveniently, which could provide a reference for the subsequent injection scheme design. Is article provides a new economical way to increase the dry powder flow rate, which is of great significance in the rapid transportation of dry powder in the pipeline, the effect of dry powder injection, and the efficiency of fire extinguishing
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