Optimization analysis of structure parameters of steam ejector based on CFD and orthogonal test

Abstract One-dimensional theoretical methods are always utilized for analysis of performances of a steam ejector but they commonly have certain limitations. Numerical simulation and analysis were carried out by means of CFD method to the flow field inside a steam ejector for recovery of waste heat; moreover, the single-factor analysis was performed to see how the ejector was affected by those single-factors such as the diameter of the nozzle outlet, the distance between the nozzle outlet to the inlet of the mixing chamber and diameters of the contraction section of the mixing chamber and the diffuser chamber, respectively, while other conditions are fixed. Multi-factor analysis was then carried out to investigate the performances of the ejector and its structures were optimized by means of the five-factor and four-level orthogonal tests to gain the sensitivity for each factor to performances of the ejector. Results indicate that the optimized ejector has much better performances and the diameter of the nozzle outlet is the most sensitively influencing factor on performances of the ejector. This study may provide a new way of thinking for optimization of structure parameters of any steam ejector and have certain values for design and application of steam ejectors.

[1]  Wenjian Cai,et al.  Shock circle model for ejector performance evaluation , 2007 .

[2]  Junjie Yan,et al.  Impact of operational and geometrical factors on ejector performance with a bypass , 2016 .

[3]  Bo Zhang,et al.  Study on the key ejector structures of the waste heat-driven ejector air conditioning system with R236fa as working fluid , 2012 .

[4]  Saffa Riffat,et al.  Experimental investigation of a building integrated photovoltaic/thermal roof collector combined with a liquid desiccant enhanced indirect evaporative cooling system , 2015 .

[5]  Ding Zhaoqiu,et al.  Effects of superheated steam on non-equilibrium condensation in ejector primary nozzle , 2016 .

[6]  Wenjian Cai,et al.  Experimental study on key geometric parameters of an R134A ejector cooling system , 2016 .

[7]  Armando C. Oliveira,et al.  CFD study of a variable area ratio ejector using R600a and R152a refrigerants , 2013 .

[8]  Wenjian Cai,et al.  Geometry parameters effect for air-cooled ejector cooling systems with R134a refrigerant , 2012 .

[9]  Lei Wang,et al.  Numerical study on optimization of ejector primary nozzle geometries. , 2017 .

[10]  Cai Wenjian,et al.  Area ratio effects to the performance of air-cooled ejector refrigeration cycle with R134a refrigerant , 2012 .

[11]  Weixiong Chen,et al.  Experimental and numerical analysis of supersonic air ejector , 2014 .

[12]  Chaobin Dang,et al.  Investigations on driving flow expansion characteristics inside ejectors , 2017 .

[13]  David F. Bagster,et al.  A New Ejector Theory Applied to Steam Jet Refrigeration , 1977 .

[14]  Pei-Xue Jiang,et al.  Flow visualization of supersonic two-phase transcritical flow of CO2 in an ejector of a refrigeration system , 2017 .

[15]  Szabolcs Varga,et al.  Preliminary experimental results with a solar driven ejector air conditioner in Portugal , 2017 .

[16]  T. Sriveerakul,et al.  Performance prediction of steam ejector using computational fluid dynamics: Part 1. Validation of the CFD results , 2007 .

[17]  Ming Liu,et al.  Simulation study on 660 MW coal-fired power plant coupled with a steam ejector to ensure NOx reduction ability , 2017 .

[18]  Pei-Xue Jiang,et al.  Experimental and numerical investigation of the effect of shock wave characteristics on the ejector performance , 2014 .

[19]  J. Keenan,et al.  An Investigation of Ejector Design by Analysis and Experiment , 1950 .

[20]  Navid Sharifi,et al.  Ejector primary nozzle steam condensation: Area ratio effects and mixing layer development , 2014 .

[21]  Elias K. Stefanakos,et al.  A review of solar thermo-mechanical refrigeration and cooling methods , 2015 .

[22]  Fabio Inzoli,et al.  Ejector refrigeration: A comprehensive review , 2016 .

[23]  Andrew Ooi,et al.  CFD analysis of ejector in a combined ejector cooling system , 2005 .

[24]  Jae-Myung Lee,et al.  Ejector performance prediction at critical and subcritical operational modes , 2017 .

[25]  Jianyong Chen,et al.  A review on versatile ejector applications in refrigeration systems , 2015 .

[26]  Bin-Juine Huang,et al.  A 1-D analysis of ejector performance , 1999 .

[27]  Satha Aphornratana,et al.  An experimental analysis of the impact of primary nozzle geometries on the ejector performance used in R141b ejector refrigerator , 2017 .

[28]  Pei-Xue Jiang,et al.  Experimental and analytical studies on the shock wave length in convergent and convergent–divergent nozzle ejectors , 2014 .

[29]  Chiheb Bouden,et al.  A CFD analysis of the flow structure inside a steam ejector to identify the suitable experimental operating conditions for a solar-driven refrigeration system , 2014 .

[30]  Junye Shi,et al.  Numerical and experimental investigation on nozzle parameters for R410A ejector air conditioning system , 2014 .

[31]  Yanxia Li,et al.  Numerical study for the influences of primary nozzle on steam ejector performance , 2016 .