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Study on startup characteristics of prototype once-through steam generator for China fast reactor

International Journal of Advanced Nuclear Reactor Design and Technology 2022年第1期4卷 26-35页

作者： Min, Xin Zhang, Dalin Xu, Rongshuan Wang, Shibao Chen, Youchun Wang, Chenglong Tian, Wenxi Qiu, Suizheng Su, G.H. State Key Laboratory of Multiphase Flow in Power Engineering Shaanxi Key Lab. of Advanced Nuclear Energy and Technology School of Nuclear Science and Technology Xi'an Jiaotong University Xi'an710049 China

Once-through steam generator (OTSG) is a vital heat transfer equipment of China Fast Reactor-600 (CFR-600), and its startup characteristics are of great importance to the safe operation of nuclear power plant. In this paper, first of all, the Thermal-hydraulic analysis Code Of Sodium heated once-through Steam generator (TCOSS) has been further optimized, and the code was introduced in the text. Secondly, the Steam Generator Test Facility (SGTF) and India Commercial Fast Breeder Reactor (CFBR) were selected for steady-state verification, and the feedwater flow rate increase condition of the prototype OTSG experiment was selected for transient verification. All the verifications were in good compliance, which proved the reliability of the TCOSS code for subsequent calculation of startup conditions. Finally, taking the prototype OTSG of CFR-600 as the research object, and the transient characteristics of cold startup and hot startup have been predicted and analyzed. The results show that both processes of cold startup and hot startup for prototype OTSG can be realized stably. The simulation results of startup processes showed a good agreement with expectations, which can provide support for the development of CFR-600 steam generator. © 2022 Xi'an Jiaotong University

关键词： Steam generators

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Experimental study on dryout point in vertical narrow annulus under low flow conditions

Experimental study on dryout point in vertical narrow annulu...

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12th International Conference on Nuclear engineering (ICONE12) - 2004

作者： Tian, Wenxi Myint, Aye Li, Zhihui Qiu, Suizheng Su, G.H. Jia, Dounan State Key Lab. Multiphase Flow P.E. 710049 Xi'an China State Key Lab. Multiphase Flow P.E. Sch. of Energy and Power Engineering Xi'An Jiaotong University 710049 Xi'an China

Prediction of dryout point is experimentally investigated with deionized water upflowing through narrow annular channel with 1.0 mm and 1.5 mm gap respectively. The annular with narrow gap is bilaterally heated by AC current power supply. The experimental conditions covered a range of pressure from 0.8 to 3.5 MPa, mass flux from 26.6 to 68.8 kg/m2 s and wall heat flux from 5.0 to 50.0 kW/m2. The location of dryout is obtained by observing a sudden rise in surface temperature, Kutateladze correlations is cited, however proved to be not a proper one for annuli gap and modified to predict the location of dryout. Considering in detail the effects of the geometry of annuli, pressure, mass flux and heat flux on dryout, an empirical correction is finally developed to predict dryout point in narrow annular gap under low flow condition which has a good agreement with experimental data.

关键词： Two phase flow

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On dynamic behavior of triangular shaped cantilevers in MEMS sensors: Effect of curvature

On dynamic behavior of triangular shaped cantilevers in MEMS...

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2010 10th IEEE International Conference on Solid-state and Integrated Circuit Technology

作者： Zhang, Gui-Ming Zhao, Li-Bo Huang, En-Ze Yuan, Guo-Ying Li, Yong Liu, Zhi-Gang Jiang, Zhuang-De State Key Laboratory for Manufacturing Systems Engineering Xi'an Jiaotong University Xi'an 710049 China State Key Laboratory of Tribology Tsinghua University Beijing 100084 China State Key Lab of Multiple Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

ISBN: (纸本)9781424457984

A study on the effect of curvature of triangular shaped cantilevers in MEMS sensors was presented. 3-D models were performed by using the SolidWorks software. And modal analysis and harmonic response analysis were carried out on different types of geometrically configured triangular shaped cantilevers using ANSYS software. The results included the variation of natural frequencies of cantilevers and maximum equivalent von mises strain on the cantilevers with respect to radius of curvature of triangular shaped cantilevers. According to the finite element analysis results, the curvature did affect dynamic behavior of triangular shaped cantilevers in MEMS sensors. Usually, the curvature is induced by the surface stress due to microprocessing or any change of temperature, etc. Therefore, in order to achieve a steady state of strain for the MEMS sensors, it's better to eliminate the surface stress and make the cantilever transform from a curved cantilever to a straight cantilever. ©2010 IEEE.

关键词： Modal analysis

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Two dimensional numerical simulation of tapered pulse tube refrigerator

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2006年第2期27卷 199-201页

作者： Zhao, Chun-Feng He, Ya-Ling Ding, Wen-Jing Yang, Wei-Wei Tao, Wen-Quan State Key Lab. of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi'an Jiaotong University Xi'an 710049 China

Two-dimensional numerical simulation of the viscous compressible oscillating flow was carried out for the uniform cross-section and tapered pulse tubes by using a compressible SIMPLEC algorithm code developed by the authors. Effects of the taper angle on the performance of the pulse tube refrigeration were studied. The results showed that there was an optimum taper angle for tapered pulse tube refrigerator. With this optimum taper angle, the refrigerator performance can be improved a lot. But when the taper angle becomes larger than the optimum value, the cooling performance becomes inferior to that of the circular tube. The inherent mechanism of how the tapered pulse tube affects the performance of pulse tube refrigerator was also studied from the view point of second flow distribution in the pulse tube. Compared to the uniform cross-section pulse tube, the values of second flow in tapered pulse tube change a lot and the distribution of second flow becomes uneven as well. This is the main reason that the performance of tapered pulse tube can be improved compared to uniform cross-section pulse tube.

关键词：锥形脉管二次流数值研究

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Multiphase flow Measurements by Full Stream Batch Sampling

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AIP Conference Proceedings 2007年第1期914卷 165-171页

作者： Dong Wang Fa‐Chun Liang Xiu‐Gang Zhang Zong‐Hu Lin State Key Lab. of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an 710049 China

A new method of multiphase flow measurements that based on the “extracting and separating method” was proposed in this paper. An extraction flow (or sample) is diverted in a manner of time sharing or full stream batch sampling, then the sample is separated into single phase flows and metered with conventional flow meters, the total flow rates of each phase are determined according to the metered values and the extraction ratios. Because the full stream is conducted to the extraction loop during sampling, no matter what the flow regime of multiphase flow is, the extracted stream (or sample) is always the representative of the total stream and the extraction ratio can keep stable. Experiments were conducted in an air‐water‐oil flow test loop, the inside pipe diameter of the test loop was 50 mm, and the superficial gas velocity varied from 4.5 m/s ∼22m/s, the liquid superficial velocity was in the range of 0.02∼0.3m/s, the oil concentration was in the range of 0.0%∼60% by volume. The flow pattern occurring during the experiments included stratified flow, wave flow and annular flow. The experimental results shown that the full stream batch sample method is feasible to measure the multiphase flow rate, and the average error of flow rates measurements for each phase was less than 3.82%.

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Wire‐Mesh Capacitance Tomography in Gas‐Liquid flows

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AIP Conference Proceedings 2007年第1期914卷 710-716页

作者： Shan‐Fang Huang Xiu‐Gang Zhang Dong Wang Zong‐Hu Lin State Key Lab. of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an 710049 China

A new intrusive, wire‐mesh capacitance tomography for phase distributions in horizontal pipes is presented. A wire with an insulating film is used as a capacitor. The capacitance is in direct proportion to water film thickness, independent of water distribution and the salinity. We can obtain film thickness by measurement of capacitance. The sensor consists of four parallel wire capacitors, vertically placed over the cross section of the pipe. The interface is the result of linking the discrete film thicknesses with smooth curve, which are the tomographic result only when both phases are continuous. Static and dynamic experiments were carried out in air‐water two‐phase flows in horizontal pipes, from which we analyze the disturbance factors of the sensor to the flow field and measurement error of film thickness. The experimental results show that the tomographic results are consistent with expectation. The method has several advantages of no reconstructed algorithms, high signal‐to‐noise ratio, high sensitivity, and high spatio‐temporal resolution. The disturbance and error can be neglected in the range of this paper.

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Combustion characteristics and heat release analysis of a compression ignition engine operating on a diesel/methanol blend

Combustion characteristics and heat release analysis of a co...

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作者： Huang, Z.H. Lu, H.B. Jiang, D.M. Zeng, K. Liu, B. Zhang, J.Q. Wang, X.B. State Key Lab. Multiphase Flow P.E. Xi'an Jiaotong University Xi'an China Sch. of Energy and Power Engineering Xi'an Jiaotong University Xi'an China State Key Lab. Multiphase Flow P./E. Inst. of Internal Combustion Engines Xi'an Jiaotong University Xi'an 710049 China

A stabilized diesel/methanol blend was developed and the combustion characteristics and heat release analysis of this blend was carried out in a compression ignition engine. The study showed that the increase in the methanol mass fraction will result in an increase in the heat release rate in the premixed burning phase and shorten the combustion duration of the diffusive burning phase. Ignition delay increases with the increase in the methanol mass fraction and the behaviour is more obvious at low engine load and high engine speed. The rapid-burn duration varies little with the methanol mass fraction and the total combustion duration decreases with the increase in the methanol mass fraction. At a low engine speed, the centre of heat release curve tends to be close to the top dead centre (TDC), with an increase in the methanol mass fraction at all engine loads and fuel delivery advance angles, the maximum rate of pressure rise and the maximum rate of heat release increase with the increase in the methanol mass fraction. At a high engine speed, the centre of the heat release curve closes to TDC at high engine load and will depart from TDC at low engine load. The maximum rate of pressure rise and heat release gives an increasing trend with the increase of methanol mass fraction at high engine loads. The maximum cylinder pressure increases with the increase of the methanol mass fraction. The presence of oxygen reduces the peak pressure, but the reduction was found to be insensitive to the proportion of oxygen within the 6-11 per cent range of testing.

关键词： Combustion

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A MEMS density sensor based on mircro-rectangular cantilever

A MEMS density sensor based on mircro-rectangular cantilever

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2010 International Conference on Mechanic Automation and Control engineering, MACE2010

作者： Zhao, Libo Huang, Enze Jiang, Zhuangde Liu, Zhigang State Key Laboratory for Manufacturing Systems Engineering Xi'an Jiaotong University Xi'an China State Key Lab. of Multiple Flow in Power Engineering Xi'an Jiaotong University Xi'an China

ISBN: (纸本)9781424477388

A rectangle cantilever-type micro density sensor was researched based on MEMS (Micro Electro-mechanical System) technology. A Ti-Pt-Au coil and a Wheatstone full bridge were made on the top of the rectangle cantilever-type sensitive chip. The sensitive chip was placed in uniform strong magnetic field. The resonant frequency of the sensitive chip was changed with the change of the AC current's frequency. The resonant frequency of rectangle cantilever could be measured through the Wheatstone full bridge circuit and lock-in amplifier, and then the fluid density associated with the resonant frequency of the sensitive chip could be calculated. The static analysis, modal analysis, a first-order and third-order harmonic response analysis of the rectangle cantilever were performed with ANSYS software. The best locations of the four force-sensitive resistor of Wheatstone bridge were studied. ©2010 IEEE.

关键词： Natural frequencies

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A MEMS resonator-type viscosity sensor based on triangular cantilever

A MEMS resonator-type viscosity sensor based on triangular c...

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2010 International Conference on Mechanic Automation and Control engineering, MACE2010

作者： Zhao, Libo Zhang, Guiming Jiang, Zhuangde Liu, Zhigang State Key Laboratory for Manufacturing Systems Engineering Xi'an Jiaotong University Xi'an China State Key Lab. of Multiple Flow in Power Engineering Xi'an Jiaotong University Xi'an China

ISBN: (纸本)9781424477388

A MEMS (Micro Electro-mechanical System) resonator-type viscosity sensor with range from 0 to 1 mPa·s was presented with good frequency response and high sensitivity. Its sensitive chip with a triangular cantilever structure was investigated. This paper studied the operating principle of the MEMS resonator-type viscosity sensor. The natural frequency of the sensitive chip was deduced with its structure size in theory, which was validated with ANSYS finite element software. The modal analysis and harmonic response analysis for the sensitive chip with triangular cantilever structure were performed to determine the resonant mode of the MEMS viscosity sensor. Finally, the layout and fabrication processes of the sensitive chip of the MEMS resonator-type viscosity sensor were designed and studied. The sensitive chip with small size, high sensitivity and high temperature resistance was fabricated with MEMS technology on SOI (Silicon on Insulator) monocrystalline in order to achieve real-time on-line measurement of fluid viscosity. ©2010 IEEE.

关键词： Natural frequencies

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Experimental study on single-phase flow resistance characteristics of rectangular channels with lateral non-uniform heating 18

Experimental study on single-phase flow resistance character...

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18th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2019

作者： Sun, Rulei Zhang, D.L. Zhou, Jiancheng Song, Gongle Tian, Wenxi Qiu, Suizheng Su, G.H. Shaanxi Key Lab. of Advanced Nuclear Energy and Technology Xi'an Jiaotong University Xi'an710049 China School of Nuclear Science and Technology State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University No. 28 Xianning West Road Xi'an China

The state-of-the-art studies on single-phase flow and hear transfer in narrow rectangular channels shows some difference with the conventional theory. In this paper, the experimental study of vertical upward flow resistance of single-phase water in rectangular channels is carried out under isothermal and non-isothermal conditions. The purpose of this study is to reveal the flow resistance of narrow rectangular channels and focus on the effect of transverse non-uniform heating. The geometric dimensions of the test section are as follows: depth 2.0 mm, aspect ratio 30. The experimental results show that the friction coefficient of rectangular narrow channel under isothermal condition is obviously larger than that of conventional channels, and the transition zone is 2600 © 2019 American Nuclear Society. All rights reserved.

关键词： Aspect ratio

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