Research On Structural Optimization Of Thermal Flow Field In Integrated Energy-saving Stove

Integrated energy-saving stove is widely used in military logistics department catering units due to its compact size and high processing efficiency.Stove named by its model numble?was considered as the object of this study aiming at solving common problems which energy-saving stove currently has,such as low thermal efficiency and high resistence.Theoretical and numerical analysis were combined in this article to investigate innate laws of flow and heat transfer characteristics.And to achieve the goal of improving thermal flow field distribution and enhancing heat transfer efficiency,evaluation indexes of multi-field synergy was applied to optimize structural and operating parameters of the stove.Theoretical calculation and optimized process have guiding significance on structural development of energy-saving stove.Based on energy conservation equation,the radiation-convective coupled heat transfer coefficient were obtained by theoretical calculation.Coupled with model of flue gas property parameters,heat transfer characteristics of different structural spoilers in the furnace were calculated by programming using C programming language.Results show that compared to cylindrical spoiler,conical spoiler is more beneficial to the enhancement of heat transfer;radiant efficiency of the bottom of the pot increased firstly and then decreased with the increase of inner spoiler major diameter,reaching peak value when the minor diameter,major diameter and height of spoiler reached 270mm,420mm,220mm respectively.Besides,the convective heat transfer accounting for about 38%of heat transfer,is the non-ignorable factor of thermal optimization.Based on theoretical calculation,optimized numerical model was built using Fluent as computing platform.And the working performance of different structural stove was compared Results show that double conical spoilers are beneficial to reduce resistence and enhance heat transfer,which verifies the optimization idea.The velocity,temperature,heat transfer and flow dynamic characteristics were numerically studied and the influences of several key structural and operating parameters were analysed.The relationship between resistence coefficient and operating parameters was obtained by fitting test data;the range of these parameters was defined to enhance heat transfer rate.The calculation files were programmed to compute multifield synergy angles in furnace,based on Fluent UDF.The influences of operating parameters on multi-field synergy characteristics were studied,using synergy angles?_m,?,?_m,?as evaluation indexes to evaluate the resistence,convective heat transfer,power consumption and comprehensive performance of the stove respectively and the criterion equations between?,?and operation parameters were obtained.Finally,orthogonal test in MDO was applied to get better performance and the priority ranking of key parameters was determined:airflow velocity,ratio of outer spoiler diameters,spray angles.And when they reach 1.5m/s,590mm,0.8,60°respectively,stove has proper thermal flow field distribution and better performance in multi-filed synergy.Finally,the structural parameters of inner and outer spoiler were obtained.