کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10147904 | 1646504 | 2018 | 20 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Realization of novel constant rate of kinetic energy change (CRKEC) supersonic ejector
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
انرژی (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Ejectors invariably convert momentum and kinetic energy of incoming fluids into enthalpy and hence pressure. Since ejectors are primarily viewed as energy exchange devices, it would be appropriate to design an ejector with its geometry being a function of the rate of energy change. This would shift ejector design approach from conventional geometry based one to that of flow physics-based approach. Hence, the paper presents a unique approach to evolving ejector design considering it primarily to be a function energy change within the system, specifically being constant rate of kinetic energy change (CRKEC). This approach has benefits in terms of mitigating the occurrence of thermodynamic shock, which is a major irreversibility that besets conventional ejector systems. A 1-D gas dynamic model including frictional effects for a more realistic design has been developed for estimating supersonic ejector geometry based on CRKEC approach. The model has been used to predict the geometry of a supersonic air ejector for typical input parameters viz., entrainment ratio (Ï) â¼0.53, recovery ratio(ζ) â¼1.4, primary stagnation pressure(Pop) â¼5.7â¯bar, secondary stagnation pressure(Pos) â¼0.7â¯bar. The results have been verified through detailed numerical analysis using Navier-Stokes system of equations with turbulence in a 2-D axi-symmetric formulation. Also, the experimental results on the developed prototype, which have also been discussed, are observed to be in close agreement with predictions of 1-D gas dynamic model and the numerical studies.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Energy - Volume 164, 1 December 2018, Pages 694-706
Journal: Energy - Volume 164, 1 December 2018, Pages 694-706
نویسندگان
Virendra Kumar, Gaurav Singhal, P.M.V. Subbarao,