분사펌프에 연결된 구동관로 위치변화에 따른 유동특성

손현철; 박길문; 고현선; 이행남

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A objective of this study is to identify the characteristics of mean velocity distribution through CFD analysis for various driven nozzle position changes. The analysis was done for different Reynolds number in entrance region of jet-pump and for several diameter ratios of driven nozzle.
(1) The largest absorption energy was found at the point s=1 in condition of diameter ratio 1:3.21 and point s=0.5 in condition of diameter ratio 1:2.25.
(2) The absorption energy was not related to the change of entrance velocity and the driven nozzle position having the largest absorption energy was function for cross section ratio.
(3) As the position of driven nozzle moves to the downstream, the absorption energy gets weaker. Because the energy from swirl was lost at the cross section gets smaller.
(4) As the position of driven nozzle moves to the downstream, the injection energy leans to the upper direction wall and as the Reynolds number increase, the lean phenomenon is more distinct.
(5) The flow quantity of driven nozzle, the diameter ratio 1:3.21, was 32% higher than that of 1 : 2.25 and as the inlet velocity gets faster the efficiency decreased. And as the cross section of the driven nozzle increases.

#Driven Nozzle(구동노즐) #Injection Pump(분사펌프) #CFD(전산유체역학) #Diameter Ratio(직경비) #Flow Quantity Efficiency(유량효율) #Absorption Energy(흡인에너지)