冲击射流高度及速度水平对混凝土传热特性的影响  

Influence of impinging jet height and velocity level on heat transfer characteristics of concrete

作　　者：黄皓翔 周伟 查柏林 王金金 李良 HUANG Haoxiang;ZHOU Wei;ZHA Bolin;WANG Jinjin;LI Liang(Rocket Force University of Engineering,Xi′an 710025,China;Project Management Center,Beijing 100085,China)

机构地区：[1]火箭军工程大学,陕西西安710038 [2]火箭军装备部装备项目管理中心,北京100085

出　　处：《混凝土》2022年第12期17-21,共5页Concrete

基　　金：国家自然科学基金青年基金项目(520032960);陕西省自然科学基础研究计划资助项目(2020JQ-488)。

摘　　要：针对井式火箭发射过程中恶劣高温燃气工况下混凝土材料传热问题,采用DIGIMAT-FE生成混凝土三维随机椭球体骨料模型,在连续介质力学框架下进行网格剖分和单元类型判定,通过FEA方法迭代求解混凝土壁面对流换热与内部热传导过程,揭示燃气冲击射流下混凝土传热规律,提出了通用性较强的多孔随机骨料结构传热特性研究方法,分析梳理出不同燃气冲击射流高度及速度水平对混凝土的传热特性影响。结果表明:当冲击射流高度或速度改变时,混凝土壁面处对流换热系数随即变化,相对集中的混凝土迎火表面高温区域面积随之增减,迎火中心点温度及模型内部传热深度数值也将产生上下波动。To solve the heat transfer problem of concrete materials under severe high-temperature gas conditions when well rockets are launched,DIGIMAT-FE is used to generate a three-dimensional random ellipsoid aggregate model of concrete,and mesh generation and element type determination are carried out under the framework of continuum mechanics.The process of concrete wall surface flow heat transfer and internal heat transfer is iteratively solved by FEA method,and the heat transfer law of concrete under gas impingement jet is revealed.A versatile research method for heat transfer characteristics of porous random aggregate structure is proposed,and the effects of different gas impingement jet heights and velocity levels on heat transfer characteristics of concrete are analyzed and combed.The results show that when the height or velocity of the impinging jet changes,the convective heat transfer coefficient at the concrete wall changes,the relatively concentrated high temperature area on the concrete fire-facing surface increases and decreases,and the temperature at the fire-facing center point and the heat transfer depth inside the model also fluctuate up and down.

关 键 词：混凝土 冲击射流 传热分析 随机骨料模型 DIGIMAT 

分 类 号：TU528.01[建筑科学—建筑技术科学]