دانلود مقاله انگلیسی رایگان:یک نظریه مضاعف دو برابر به عنوان توضیحی در مورد قوانین تکامل عملکرد اجکتور با پارامترهای مختلف عملیاتی و هندسی - 2020
دانلود بهترین مقالات isi همراه با ترجمه فارسی 2
دانلود مقاله انگلیسی فیزیک عمومی رایگان
  • A double-choking theory as an explanation of the evolution laws of ejector performance with various operational and geometrical parameters A double-choking theory as an explanation of the evolution laws of ejector performance with various operational and geometrical parameters
    A double-choking theory as an explanation of the evolution laws of ejector performance with various operational and geometrical parameters

    سال انتشار:

    2020


    عنوان انگلیسی مقاله:

    A double-choking theory as an explanation of the evolution laws of ejector performance with various operational and geometrical parameters


    ترجمه فارسی عنوان مقاله:

    یک نظریه مضاعف دو برابر به عنوان توضیحی در مورد قوانین تکامل عملکرد اجکتور با پارامترهای مختلف عملیاتی و هندسی


    منبع:

    Sciencedirect - Elsevier - Energy Conversion and Management, 206 (2020) 112499: doi:10:1016/j:enconman:2020:112499


    نویسنده:

    Yongzhi Tanga,b, Zhongliang Liua,⁎, Yanxia Lia, Nan Yanga, Yangda Wanb, Kian Jon Chuab,⁎


    چکیده انگلیسی:

    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


    سطح: متوسط
    تعداد صفحات فایل pdf انگلیسی: 12
    حجم فایل: 1514 کیلوبایت

    قیمت: رایگان


    توضیحات اضافی:




اگر این مقاله را پسندیدید آن را در شبکه های اجتماعی به اشتراک بگذارید (برای به اشتراک گذاری بر روی ایکن های زیر کلیک کنید)

تعداد نظرات : 0

الزامی
الزامی
الزامی
rss مقالات ترجمه شده rss مقالات انگلیسی rss کتاب های انگلیسی rss مقالات آموزشی
logo-samandehi