Experimental and numerical study of high-pressure water-mist nozzle sprays

2016 ◽  
Vol 81 ◽  
pp. 109-117 ◽  
Author(s):  
H.M. Iqbal Mahmud ◽  
Khalid A.M. Moinuddin ◽  
Graham R. Thorpe
Keyword(s):  
High Pressure ◽  
Numerical Study ◽  
Water Mist ◽  
Pressure Water

High Pressure Water Mist – The Modern Approach In Fire Fighting

2005 ◽  
Author(s):  
Stefan Gordin
Keyword(s):  
High Pressure ◽  
Fire Protection ◽  
Water Mist ◽  
Fire Fighting ◽  
Modern Approach ◽  
Protection Efficiency ◽  
Sprinkler Systems ◽  
Pressure Water ◽  
In Fire

In only ten years, high pressure water mist fire protection has evolved from theory to becoming widely accepted as an alternative to traditional sprinkler systems, foam, CO2, halon, and other gases. It has proven itself as offering equal fire protection efficiency to these other systems and, in many conditions, exceeding them.

Modeling and Simulation of High Pressure Water Mist Systems

2013 ◽  
Vol 50 (3) ◽  
pp. 483-504 ◽  
Author(s):  
Topi Sikanen ◽  
Jukka Vaari ◽  
Simo Hostikka ◽  
Antti Paajanen
Keyword(s):  
High Pressure ◽  
Modeling And Simulation ◽  
Water Mist ◽  
Pressure Water

Investigation of Applicability of Transporting Water Mist for Cooling Turbine Blades

2014 ◽  
Author(s):  
Ting Wang ◽  
Reda Ragab
Keyword(s):  
High Pressure ◽  
Gas Turbine ◽  
Numerical Study ◽  
Particle Diameter ◽  
Water Mist ◽  
Cover Plate ◽  
Air Cooling ◽  
Real Gas ◽  
Rotating Blades ◽  
Cooling Passage

This paper presents a numerical study to investigate the feasibility of transporting water mist to the rotating blades of a high pressure turbine. The idea of using mist film cooling to enhance conventional air cooling has been proven to be a feasible technique under laboratory conditions. However, there are challenges in implementing this scheme for real gas turbine systems. The first challenge is how to transport the mist to the rotating blades and the second challenge is delivering the mist to the injection holes and getting the particles to survive within the harsh gas turbine environment. Both a zero-dimensional mist evaporation analytical model and a 3D computational fluid dynamics (CFD) scheme are employed for analysis. In the CFD simulation, the Lagrangian-Eulerian method is used along with the discrete phase model (DPM) to track the evaporation process of each individual water droplet. For transporting the mist to the blades, the high-pressure water mist is injected into the stream of cooling air extracted from the compressor through two different passages. The first passage passes through the rotor cover-plate cavity before entering the blade base. The second passage passes through a diaphragm box on the base of the second vane, then tangentially through a cooling passage in the rotating shaft, and eventually to the blade base. The results show that it is feasible to transport the mist from the turbine casing to the blade through both passages, provided that droplets with sufficient particle diameter and mist loading are used. The shorter passage, through the nozzle diaphragm, alleviates a lot of challenges facing the passage through the blade cavity, and seems to be more practical. A side benefit of transporting mist through the internal passages is the additional cooling of the pre-swirler and rotor cover plates. The results are encouraging for implementing the mist cooling technique under real gas turbine conditions.

scholarly journals Numerical study on laminar free convection heat transfer between sphere particle and high pressure water in pseudo-critical zone

2014 ◽  
Vol 18 (4) ◽  
pp. 1293-1303 ◽  
Author(s):  
Liping Wei ◽  
Youjun Lu ◽  
Jinjia Wei
Keyword(s):  
Heat Transfer ◽  
High Pressure ◽  
Free Convection ◽  
Fluidized Bed ◽  
Numerical Study ◽  
Convection Heat Transfer ◽  
Boussinesq Approximation ◽  
Convection Heat ◽  
Pressure Water ◽  
Free Convection Heat

Supercritical water fluidized bed reactor (SCWFBR) is a promising new reaction vessel which can effectively gasify wet biomass and efficiently produce hydrogen. Free convection heat transfer from particle in supercritical water (SCW) is a major basic heat transfer mechanism in a fixed bed or fluidized bed with low superficial velocity. In this paper, numerical study on the steady free convection heat transfer around single sphere particle in high pressure water of pseudo-critical zone was carried out. Both the Boussinesq approximation method and real properties model (considering variable specific heat, density, viscosity, and conductivity of SCW) were incorporated to simulate the flow and temperature field. With respect to Boussinesq approximation, real properties model shows higher vorticity and temperature gradients in the vicinity of the sphere surface, which shows variation of thermo-physical property has remarkable effect on the free convection heat transfer process. High local Nusselt number and high heat transfer rate were observed with real properties model.

Experimental Study on Radiant Heat of Market Shelf Fire Decayed by High-Pressure Water Mist System

2012 ◽  
Vol 518-523 ◽  
pp. 3699-3702 ◽  
Author(s):  
Jian Ying Wang ◽  
Xi Lin Dong
Keyword(s):  
Experimental Study ◽  
High Pressure ◽  
Decay Rate ◽  
Radiant Heat ◽  
Water Mist ◽  
Radiation Heat ◽  
Pressure Water ◽  
Experimental Combustion

Experimental study on radiant heat of market shelf fire depressed by high-pressure water mist system was carried out. The experiment researched on typical burning parts and combustions of places like market, and chosen experimental combustion components. The results show that the concentrate spray of high-pressure water mist system can decay the radiant heat of fire shelf effectively. The higher the spray pressure of the system, the faster the decay rate of radiation heat.

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