Jing Hu
ABSTRACT
This study focuses on the fire monitor's nozzle head and uses CFD numerical simulation to conduct a thorough analysis of the flow characteristics of the original and improved schemes (the original scheme added an auxiliary flow-guiding structure at the nozzle head's inlet) under direct injection and spray. The goal is to address the issues of limited coverage area during spraying and insufficient range during direct injection of a specific manufacturer's 80mm self-oscillating fire monitor. Testing at the nearby fire department is another aspect of the study. The findings show that when water pressure rises, the nozzle head's horizontal water jet velocity, vertical spray velocity, and pressure loss at the inlet and outlet ends all increase. The pressure loss in the nozzle head pipeline is decreased by more than 20 percent upon the addition of the auxiliary flow-guiding structure at the nozzle head's inlet. This could potentially increase the spraying area and direct injection range. The actual test results, which serve as a guide for the design of comparable fire monitor nozzle heads, demonstrate that the range of direct injection increased by at least 6% when the water pressure was 0.18 MPa.
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