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A double-choking theory as an explanation of the evolution laws of ejector performance with various operational and geometrical parameters
یک نظریه مضاعف دو برابر به عنوان توضیحی در مورد قوانین تکامل عملکرد اجکتور با پارامترهای مختلف عملیاتی و هندسی-2020 There are few systematic studies to investigate the inherent reason behind the evolution law of ejector performance,
only some simple qualitative or roundabout analysis. In this paper, a double-choking theory is proposed
to provide an in-depth explanation of the evolution laws of ejector performance. The systematic investigation
and quantitative analysis focus on the influences of various operational and geometrical parameters on the
ejector choking flows. Key results revealed that the flow area of the primary jet flow at the choking cross-section
Apy almost linearly increases with higher primary flow pressure pp0, while the entrainment choking area Aey
declines instead, and thus the entrainment ratio ε decreases. The mixing pressure py significantly increases with
entrainment pressure pe0, and Apy partly reduces. Consequently, Aey becomes larger and ε is accordingly with an
over-double increase. Apy undergoes a continuous decrease when the area ratio of primary nozzle λt increases,
and thus ε rises consistently although Aey1 eventually experiences a slight decrease. However, the choking state
of the entrained flow would discontinue as λt exceeds its critical value λtc. Additionally, Aey increases substantially
when the area ratio of the constant-area section λ3 enlarges, while Apy and py always remain unchanged.
Accordingly, ε follows the same increasing trajectory as Aey. These impactful results could serve as an
essential guide for optimizing the ejector design, and also ensure a clearer perspective to understand the fundamental
link between the ejector’s entrainment performance and choking flow. Keywords: Double-choking theory | Ejector | Entrainment performance | Operational and geometrical parameters | Choking flow | Evolution laws |
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