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The enhanced emission yields of secondary ions induced by Si2 clusters at the low energies are clearly seen and attributed to the vicinage effect of the nuclear collision processes of cluster constituents and the secondary ion emissions are still dominated by electronic stopping processes at high energies.

实验结果显示,在以上的生物样品中,MeV能量离子的能量损失值和TRIM程序模拟的结果相吻合,但是透射离子的能量离散值却与TRIM程序模拟结果有很大的不同。结合生物样品的结构不均匀的特性,对Bohr能量离散理论进行了修正,并发现修正后的Bohr能量离散理论计算结果与实验值符合得很好。

In addition, as an application of the modeling method for gas-solid two-phase flow, the mechanism of bag failure in a defective baghouse dust collector is numerically analyzed, and optimization study is further performed.

为了实验研究的需要,发明了一种新型气液固多相流实验模拟装置,实现了液体和固体颗粒的在线混合和分相输送计量,同&先离线混合,后混相输送计量&的传统方法相比,具有模拟精度高、调节方便、建造费用低和结构紧凑等优点。

Based on analysis of the current state of the flow pattern modeling abroad and at home, explains the meaning of the mathematical simulation of the flows in the valve.(2) Comparing flow simulation data of jet pump with its experimental one, the feasibility and reliability of FLUENT used for flow simulation are proved.(3) Based on the characteristic of valves, the fluid field analysis of specific ring-spray type flow-adjustable is finished. The valve structure is optimized to meet the need, which makes it have such advantages:(1)smaller vortex area and faintish vortex intensity, so the vibration of vortex is controlled effectively;(2)the pressure is distributed more equality, the transition area is larger.

论文的主要内容包括:(1)简述了阀门研究的现状与发展,在分析与总结国内外流体流动模拟研究的基础上,探讨开展阀门内水流运动数值模拟的意义;(2)对特定型号的射流泵进行了内部流场的数值模拟研究,并与实验数据相比较,验证了应用Fluent进行数值模拟的可行性和可靠性;(3)针对调流阀的特点,对特大口径环喷式流量调节阀进行流场计算,其设计指导思想如下: 1、控制旋涡,减小旋涡区,减小涡的强度; 2、控制压力分布,使阀体受力更均匀,改善局部应力状态,提高阀门使用的安全性; 3、最小绝对压力高于水的汽化压力,不产生汽蚀。

Based on the functions from closed vessel experiments, the ballistic simulation results of maximum chamber pressure, muzzle velocity and p-t curves of a 105mm gun charged with LTSC nitroamine propellant at +50℃,+15℃ and -40℃ environmental temperature were in good agreement with experimental data.

在密闭爆发器实验的基础上,应用可视化程序对某105mm火炮采用低温感硝胺火药在+50℃、+15℃和-40℃环境温度下的最大膛压、初速以及膛压—时间曲线进行了弹道模拟,模拟与实验结果具有较好的一致性。

Based on the functions from closed vessel experiments, the ballistic simulation results of maximum chamber pressure, muzzle velocity and p-t curves of a 105mm gun charged with LTSC nitroamine propellant at +50C,+15C and -40℃ environmental temperature were in good agreement with experimental data.

在密闭爆发器实验的基础上,应用可视化程序对某105mm火炮采用低温感硝胺火药在+50℃、+15℃和-40℃环境温度下的最大膛压、初速以及膛压—时间曲线进行了弹道模拟,模拟与实验结果具有较好的一致性。

Fin spacing and density of the staggered tube bundle have much more influence on its performance, when the distance between fins decreased or the tube distributing density increased, heat transfer of the exchanger will be strengthened and pressure drop will be distinctly aggrandized.

从实验和模拟结果分析可知,实验所得传热因子j较模拟结果有12%范围内的减小,而阻力因子f有4%~16%的增大;翅片间距和管排密集度对翅片管换热器性能影响很大,减小翅片间距和增大管排密集度均能增强换热器的换热效果,但压力损失也明显增加。

Water quality on-line monitoring equipment; water quality bio-chemical analysis apparatus; the experimental system for the dynamic simulation of water environments, and the on-line measurement of water body deoxygenating, re-aeration and the organic contaminant concentrations; the experimental system for the dynamical simulation of eutrophication of water environments.

实验中心主要仪器设备有:水质要素在线野外监测设备、水质要素生物化学分析仪器、水环境动态模拟与在线测定水体耗氧、复氧以及各种有机污染物浓度的试验系统,水环境富营养化动态模拟控制实验系统,可以对水质要素进行时间和空间上的监测与分析处理,为水污染治理提供科学的依据。

In this paper, experimental study (Ma=2.0 of cold flow) on a scramjet combustor model without combustion was carried on direct-connected facility. The effects of inflow parameter, length of isolator and back pressure on combustor and isolator flow field were analyzed and compared. The flow field of combustor was simulated with CFD software and the experimental results were compared.

文中在超燃冲压发动机燃烧室直连式实验设备上,对超音速燃烧室模型进行( Ma =2.0)冷流实验研究,比较了不同的来流条件、不同的隔离段长高比和不同的燃烧室出口反压对燃烧室内部流场以及燃烧室隔离段的抗扰动能力的影响,并利用数值模拟的方法对燃烧室内部流场进行了模拟。

The flow and hazardous chemical diffusions in meandering channel used by Chang's experiments are simulated.

对Chang实验的弯曲水槽的流动及危化品扩散进行数值模拟,模拟结果与实验结果较吻合。

The experiment table on heat transfer of finned tube is established to test the validity of numerical simulation. The heat and temperature distribution of tube and the air around tube are measured.

为了证明以上模拟结果的准确性,建立了翅片管换热实验台,通过实验测出翅片管及其周围空气的温度分布和散热量,与数值模拟结果进行比较,从而验证了数值计算的准确性。

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