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| 1 | 高温阀门的研究进展显示文摘针对高温阀门因长期在高温工况下工作而带来的安全性问题,从高温阀门的结构设计和高温阀门的结构强度两个方面出发,对高温阀门的研究现状进行了调研。简述了高温阀门运动部件和密封部件的结构改进方法,介绍了高温阀门结构强度研究的主流研究方法,总结了高温阀门的热应力问题和热疲劳问题的研究现状。研究结果表明:今后高温阀门的发展和研究趋势包括:(1)从材料入手改善运动部件和密封部件的热处理工艺技术或堆焊技术,(2)高温工况下高温阀门强度分析的双向耦合方法,(3)考虑热应力的高温阀门安全评估规范,(4)在阀体结构优化中借助计算机技术的发展,并结合力学优化算法。 | 林振浩 钱锦远 李文庆 金志江 | 2020 | 机电工程2020，37，7： | 15 |
| 2 | 高浓度固液两相球阀开启压差特性分析显示文摘利用雷诺应力模型和欧拉—欧拉方法对固液隔膜泵出口球阀的开启压差及压力分布特性进行了理论推导与仿真分析,以纯液相压力特征为基础,进一步研究了多参数下高浓度固液两相流进出口压差的变化规律并相应地建立了压差理论及回归数学模型。研究结果表明,球阀出口压力为1.0 MPa,阀球材质为氟橡胶包覆硬铝质芯时,理论分析所得球阀开启所需压差为3.99×105Pa,而球阀开启后,模拟得到进出口压差及轴向液动力迅速衰减,低压力区出现于阀座上下顶角间的10 mm环形阀隙中心区域,其轴向位置随阀口开度增大呈线性下降。当流动介质为高浓度液固两相流时,阀隙内部射流加速段上移至阀座上顶角z=30 mm处,球阀进出口压差达到了单相流压差的8倍以上,并且得到了各物性和操作参数(阀口开度、固相浓度、混合粘度、入口流量等)对压差影响的显著性程度排序。 | 马艺 马中强 张生昌 邓鸿英 | 2014 | 流体机械2014，42，12： | 7 |
| 3 | Numerical investigation on flow and heat transfer characteristics of supercritical RP-3 in inclined pipe显示文摘Numerical simulations of flow and heat transfer to supercritical RP-3 through the inclined tubes have been performed using LS k–e model embedded in Fluent. The physical properties of RP-3 were obtained using the generalized corresponding state laws based on the fourcomponent surrogate model. Mass flow rate is 0.3 g/s, system pressure is 3 MPa, inlet temperature is 373 K. Inclination of the inclined pipe varied from -90° to 90°, with heat flux varied from 300 k W/m^2 to 400 kW/m^2. Comparison between the calculated result and the experimental data indicates the range of error reasonable. The results of ±45° show that temperature inhomogeneity in inclined pipe produce the secondary flow in its cross section due to the buoyancy force. Depending on the strength of the temperature inhomogeneity, there will be two different forms of secondary flow and both contribute to the convective heat transfer in the pipe. The secondary flow intensity decreases when the inhomogeneity alleviates and thermal acceleration will play a leading role. It will have a greater impact on the turbulent flow to affect the convective heat transfer in the pipe. When changing the inclination, it affects the magnitude of the buoyant component in flow direction. The angle increases, the buoyancy component decreases. And the peak temperature of wall dominated by the secondary flow will move forward and increase in height. | Zhi TAO Liangwei LI Jianqin ZHU Xizhuo HU Longyun WANG Lu QIU | 2019 | Chinese Journal of Aeronautics2019，32，8： | 3 |
| 4 | Evaluation of thermal effects on temperature-sensitive operating force of flow servo valve for fuel metering unit显示文摘The temperature-induced variation in operating force of flow control valves may result in performance degradation or even jam faults of fuel metering unit(FMU), which significantly affects the safety of aircrafts. In this work, an analytical modeling approach of temperature-sensitive operating-force of servo valve is proposed to investigate the temperature characteristics in varying temperature conditions. Considering the temperature effects, a new extended model of flow force is built and an analytical model of valve friction is also derived theoretically based on the dynamic clearance induced by thermal effects. The extremum condition of friction is obtained to analyze the characteristic-temperature points where jam faults occur easily. The numerical results show that flow force increases firstly and then decreases as temperature increases under a constant valve opening. The maximum friction of flow servo valve can be uniquely determined when the structural parameters and ambient temperature are given. The worst situation just happens at the characteristic-temperature points, which are linearly related to the axial temperature gradients of valve spool. Such evaluations may give an explanation for the temperature-induced jam faults of vulnerable valves and provide a reference for designers to determine a suitable workingtemperature range of valves in practice. | Yang ZHANG Shaoping WANG Jian SHI Xi WANG | 2020 | Chinese Journal of Aeronautics2020，33，6： | 2 |
| 5 | 热力耦合作用下阀门高温结构蠕变疲劳损伤研究显示文摘在运行过程中,高温阀门同时经历高温高压、长时稳定载荷和短时交变载荷的作用,蠕变损伤和疲劳损伤同时存在,但目前针对高温阀门多工况蠕变损伤、疲劳损伤和蠕变疲劳耦合的研究还较少。为此,建立了钠快冷堆调节阀阀体有限元模型,对蠕变、疲劳以及蠕变疲劳损伤进行了计算与安全性评估。首先,采用ANSYS有限元分析软件,结合多工况稳态以及瞬态热力耦合的方法,对高温核电阀门的阀体进行了数值模拟计算;然后,使用蠕变本构方程对高温阀门阀体进行了蠕变分析;最后,以ASME规范的线性累积损伤理论为判据,对高温调节阀阀体进行了蠕变、疲劳以及蠕变疲劳交互损伤安全性评定。研究结果表明:在13种瞬态工况以及4种稳态工况产生的热力耦合作用下,阀体出口处均产生了较高的应力,经分析得出扭矩是造成阀体出口处应力高的主要因素;通过数值计算得出了循环变载荷造成阀体产生的疲劳损伤为0.001 8,而长时间处于高温环境中的蠕变损伤为0.1,由此得出了高温阀门受到蠕变破坏的可能性高于疲劳破坏;该研究结果可为第四代高温核电阀门的分析与设计提供理论基础和技术方案。 | 王磊 谈建平 于新海 刘平 陈时健 | 2023 | 机电工程2023，40，5： | 2 |
| 6 | 基于ASME标准的高温阀门结构强度分析显示文摘为了提升新一代核电阀门工程应用的可靠性,建立了高温调节阀有限元模型,对调节阀进行了稳态热力耦合计算以及蠕变数值模拟,在分析ASME NB和NH分卷中的热力学强度评定方法的基础上对调节阀进行了强度评定。发现温度梯度大是造成调节阀热应力集中的主要原因。调节阀服役30万h时阀体最大蠕变应力值为43.9 MPa,蠕变应变值为0.91%,蠕变损伤值为0.1,结合标准和材料蠕变性能试验数据,发现阀体在30万h设计寿命下不会发生蠕变强度失效。本文为第四代核电高温调节阀的高温结构完整性设计提供了计算方法。 | 陈时健 谈建平 付佳 龙云飞 王磊 于新海 汝强 | 2023 | 流体机械2023，51，10： | 0 |
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