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A Thermodynamic Cavitation Model for Cavitating Flow Simulation in a Wide Range of Water Temperatures
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A thermodynamic cavitation model is developed to simulate the cavitating water flow in a wide temperature range. The thermal effect on bubble growth during cavitation is introduced in the developed model by considering both pressure difference and heat transfer between the vapor and liquid phase. The cavitating turbulent flow over a NACA0015 hydrofoil has been simulated at various temperatures from room temperature to 150°C by using the present cavitation model, which has been validated by the experimental data. It is seen that the thermodynamic effects of cavitation, vapor depression and temperature depression are much more predominant in high temperature water compared with those in room temperature water. These results indicate that the proposed thermodynamic cavitation model is reasonably applicable to the cavitating water flow in a wide temperature range. 相似文献
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几种水机常用金属材料的冲蚀磨损性能研究 总被引:7,自引:6,他引:1
研究了在水力机械中普遍应用的铸铁(HT200)、中碳结构铸钢(40#)、不锈钢(1Cr18Ni9Ti)和高铬铸铁(KmTBCr26)4种材料的冲蚀磨损规律,得出了材料的冲蚀磨损率随磨损时间、冲蚀速度、磨粒浓度和粒径变化的规律,同时根据观察材料冲蚀磨损表面形貌探讨了其冲蚀磨损机理.结果表明:材料的冲蚀磨损性能受到材料基本机械性能的控制,其中高硬度材料的抗冲蚀性能较好,在相同试验条件下其磨损率由大到小排列顺序为HT200>40#>1Cr18Ni9Ti>KmTBCr26;4种材料的冲蚀磨损率随磨粒粒径、浆料浓度和磨粒冲击速度的变化规律基本一致,当磨粒粒径小于425 μm时,磨粒粒径对KmTBCr26和1Cr18Ni9Ti的磨损率影响很小;金属材料的组织结构对材料的冲蚀磨损性能和机理影响较大,其中KmTBCr26和1Cr18Ni9Ti的冲蚀磨损机理以脆性断裂、破裂及颗粒脱落为主,而HT200和40#的冲蚀磨损机理以选择性切削式冲蚀磨损为主. 相似文献
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A three-component model based on mass transfer equation is proposed to simulate both the natural and ventilated cavitations. In the present cavitation model, the content of nuclei in the local flow field is updated synchronously, and is coupled with the Rayleigh-Plesset equation so as to capture the cavity development. The proposed model is applied for simulating the cavitating flow around a super-cavitating vehicle in different cavitation conditions. In the ease of the natural cavitation simulation, the predicted cavitation characteristics including the cavity length and cavity diameter agrees fairly well with the analytical results. In the case of the mixed cavitation simulation, the gas ventilation obviously influences the development of cavity. With the increase of the gas ventilated rate, the natural cavitation is suppressed remarkably, and a super cavitation is formed even at a relatively larger natural cavitation number. 相似文献
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离心式渣浆泵叶轮磨损规律研究 总被引:7,自引:3,他引:7
在实验室条件下对离心式渣浆泵叶轮的磨损规律进行了研究,并对泵轮叶片间流道的颗粒运动轨迹进行数值模拟。探讨了磨粒浓度、泵转速、叶片几何参数、运行时间及磨粒粒径对泵轮磨损的影响。研究表明:叶片的磨损强度与泵轮转速呈5次方关系,叶片进口角对磨损强度影响明显,出口角对磨损强度影响不大,研究结果对渣浆泵的设计具有重要的参考价值。 相似文献
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渣浆泵的固液流设计原理 总被引:6,自引:0,他引:6
渣浆泵广泛应用于矿山、冶金、电力、煤炭、水利、交通等行业,进行尾矿、精矿、煤泥和砂砾等固体物料的水力输送。按清水理论设计的渣浆泵在抽送固液混合流体时效率普遍偏低,磨蚀严重,造成能源和设备的大量浪费。 本文应用固液流动理论,给出固液渣浆泵(简称固液泵)的基本方程式,应用于离心泵 相似文献
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