Numerical Simulation And Experiment On Deflector Of Central Exhaust System Of Residential Kitchen In High-rise Buildings

In recent years, with the development trend of the urbanization of the population,multi-layer, high-rise buildings will gradually become the main trend of the futureurban housing. However, with the construction of large-scale high-rise buildings,hidden past multi-storey residential kitchen exhaust problem appeared in high-risebuildings. Kitchen as the biggest pollutants in the home environment, always endangerthe health of the person in the room. In order to not pollute the indoor environment, toprotect the health of staff of residence, and quickly and effectively eliminate indoor aircontamination is a top priority in the design of indoor ventilation. Based on theconcentrated exhaust flue gas discharge channel conditions field measurement, andlead to difficult household kitchen exhaust strings of smoke, odor and other hot issuesare summarized, and finally through the CFD numerical simulation method somesmoke issues do further studyFirstly, by two different types of D*-type and E*-type33-layer cross sectionconcentrated row of the exhaust of the flue gas channel were tested. The comparativeanalysis of the system in the hood is turned on rates layers flue manifold, in charge ofthe speed value and the static pressure value. Under the same test conditions, comparedto the amount of exhaust found levels of user E*-type the section transformer33central exhaust channel smoke in an unfavorable situation, the amount of smoke layersof users is difficult to meet the design requirements, and layers user the amount ofsmoke is not uniform. D*-type section flue system exhaust is better, the hood is turnedon rates recommended by the experts, the layers can basically meet the demand forsmoke. Conclusion on the cause row of the E-type flue gas channel section size is toosmall, the local resistance of the internal components of the system is too large. Isuggest increasing the system the main flue cross-sectional dimension of the local member for optimization.In addition, the article also install roof power hood exhaust system exhaust testing,the hood is not installed on the roof power conditions comparison, the initial totalpressure of small power hood installed in the outlet of the system, and will not improvethe system the amount of smoke, on the contrary when the system operation rate islarge, the system exhaust the power hood resistance is too large, but hindered.Smoke measured by the above two rows of flue gas channel limited, the rangehood initial pressure head, in order to improve the system ability to smoke, you mustreduce the drag of flue gas in the flow process. I use of CFD numerical simulation,several common flue internal flow guide members come to the local confluence dragcoefficient of flow guide member; analysis than that of the main, branch pipes ofdifferent sizes, different flow than diversion the local member confluence resistancevariation, and the performance of the deflector member and anti-string the smokeability to conduct the evaluation.Finally, through numerical simulation, and analysis of hot flue gas exhaustcapability of the system. Plurality of operating conditions set according to the type ofoutdoor temperature changes, to simulate the layers of the user of the type of outdoortemperature system the amount of smoke, and does not consider the temperatureconditions were compared. The results found that the corresponding design settingswhen the simulation conditions are the same as the outdoor temperature decreases,volley exhaust capacity of the flue gas channel system gradually increases. Especiallyfor the bottom of the user by pressing effect is more apparent. But when the exhaustgas temperature and outdoor air temperature difference value is not hot is not obvious.Therefore, in residential kitchens flue design, the role of the hot flue gas as the safetyfactor, ignoring its exhaust system.