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Frontier Issues and Progress of Controlled Nuclear Fusion Science and Technology

Gao Xiang,Wan Yuanxi,Ding Ning,Peng Xianjue

Strategic Study of CAE 2018, Volume 20, Issue 3,   Pages 25-31 doi: 10.15302/J-SSCAE-2018.03.004

Abstract:

Controlled nuclear fusion energy will be an ideal clean energy in theReactor (ITER) project is the focus of research conducted by the international magnetic confinement fusionShort-term, mid-term and long-term technical goals of magnetic confinement fusion research in China areproposed, and a roadmap of magnetic confinement fusion research in China is drafted.ignition and explore a Z-pinch driven fusion and fission hybrid reactor.

Keywords： ITER     CFETR     Z-pinch     fusion ignition     pulse power    

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An experimental study on ignition of single coal particles at low oxygen concentrations

Wantao YANG, Yang ZHANG, Lilin HU, Junfu LYU, Hai ZHANG

Frontiers in Energy 2021, Volume 15, Issue 1,   Pages 38-45 doi: 10.1007/s11708-020-0692-1

Abstract: An experimental study on the ignition of single coal particles at low oxygen concentrations ( <21%) wasThe ignition processes were recorded by a high-speed camera at different values and furnace temperaturesIn addition, is less sensitive to while the ignition temperature is more sensitive to at a lowObservations of the position of flame front evolution illustrate that the ignition of a coal particlemay change from a homogeneous mode to a heterogeneous or combined ignition mode as decreases.

Keywords： coal particles     low oxygen concentration     ignition     ignition temperature     ignition modes    

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Numerical study of ignition mechanism of n-heptane direct injection compression-ignition engine

Xiaoping GUO, Zhanjie WANG,

Frontiers in Energy 2009, Volume 3, Issue 4,   Pages 432-439 doi: 10.1007/s11708-009-0050-9

Abstract: reaction and the corresponding cell as ignition position.The result shows that the ignition in the engine can be divided into low-temperature ignition and high-temperatureLow-temperature ignition reaction, whose ignition reaction is c5h9o1-4=ch3cho+c3h5-a, follows the oxidationmechanism, while high-temperature ignition reaction, whose ignition reaction is c2h3o1-2=ch3co, followsNo matter which ignition it is in, the chemical reaction that restrains the ignition reaction from lasting

Keywords： compression-ignition engine     ignition mechanism     elementary reaction     n-heptane    

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Influence of different oil feed rate on bituminous coal ignition in a full-scale tiny-oil ignition burner

Chunlong LIU, Qunyi ZHU, Zhengqi LI, Qiudong ZONG, Xiang ZHANG, Zhichao CHEN

Frontiers in Energy 2013, Volume 7, Issue 3,   Pages 406-412 doi: 10.1007/s11708-013-0266-6

Abstract: To reduce oil consumption during firing-up and partial-load operation, a tiny-oil ignition burner hasThe ignition burner is identical to that normally used in an 800 MWe utility boiler.

Keywords： ignition     coal     burner     boiler     oil flow rate    

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Numerical simulation of combustion characteristics at different coal concentrations in bituminous coal ignitionin a tiny-oil ignition burner

Chunlong LIU, Qunyi ZHU, Zhengqi LI, Qiudong ZONG, Yiquan XIE, Lingyan ZENG

Frontiers in Energy 2013, Volume 7, Issue 2,   Pages 255-262 doi: 10.1007/s11708-013-0255-9

Abstract: With the objective of producing a full-scale tiny-oil ignition burner, identical to the burner used inMWe utility boiler, numerical simulations were performed using Fluent 6.3.26 to study the progress of ignitionflowed to the burner nozzle, the high-temperature region expanded, ensuring a successful pulverized-coal ignition

Keywords： numerical simulation     tiny-oil ignition burner     pulverized coal     temperature field    

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Ignition of Diesel by Heated Surface

Li Yuanlong,Lu Shouxiang,Fan Weicheng

Strategic Study of CAE 2004, Volume 6, Issue 11,   Pages 63-65

Abstract:

The ignition of leaked fuel of the diesel engine is studied experimentally.The critical ignition temperature is calculated statistically.The difference between the ignition temperature and auto - ignition temperature of diesel is much lessThe ignition mode is also much different from its counterpart.

Keywords： hot surface     ignition test     boiling    

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Effect of distributions of fuel concentration and temperature on ignition processes in a diesel PCCI

Yang YU, Wanhua SU,

Frontiers in Energy 2010, Volume 4, Issue 2,   Pages 269-279 doi: 10.1007/s11708-009-0046-5

Abstract: The distributions of fuel concentration and temperature have significant effect on the ignition processesof diesel premixed charge compression ignition (PCCI) combustion.It was found in this study that the ignition process of PCCI combustion organized by multi-pulse injectionIgnition always occurred in the position where the mixture featured with equivalence ratios close toa larger initial ignition area and a higher temperature at the ignition area.

Keywords： PCCI     fuel stratification     multi-pulse injection     ignition    

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Study on electrical ignition and micro-explosion properties of HAN-based monopropellant droplet

Yonggang YU, Ming LI, Yanhuang ZHOU, Xin LU, Yuzhu PAN,

Frontiers in Energy 2010, Volume 4, Issue 3,   Pages 430-435 doi: 10.1007/s11708-010-0010-4

Abstract: In order to study the electrical ignition characteristics of hydroxylammonium nitrate (HAN)-based liquidpropellant, an experimental device for the electrical heating ignition of a liquid propellant dropletBy using a high speed camera system, the ignition properties of the LP1846 single droplet were observedWhen peak load voltage is from 80 to 140V/s, the ignition delay of the LP1846 droplet is linearlyBased on the above experiments, a simplified model of the electrical heating ignition of the LP1846 single

Keywords： liquid propellant     electrical ignition     ignition delay time     transient measurement    

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New experimental technique to determine coal self-ignition duration

ZHANG Xinhai, XI Guang, ZHANG Xinhai

Frontiers in Energy 2008, Volume 2, Issue 4,   Pages 479-483 doi: 10.1007/s11708-008-0058-6

Abstract: An artificial neural network (ANN) model was adopted to simulate the relationship between self-ignitionand the data from the oil-bath experiment were taken as ANN inputs to calculate the experiment self-ignitionthan 1% of coal sample and 10% of time are required with an error of less than 3 days to test self-ignition
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Magnetic confinement fusion: a brief review

Chuanjun HUANG, Laifeng LI

Frontiers in Energy 2018, Volume 12, Issue 2,   Pages 305-313 doi: 10.1007/s11708-018-0539-1

Abstract: Fusion energy is considered to be the ultimate energy source, which does not contribute to climate changeDuring the past several decades, never-ceasing efforts have been made to peacefully utilize the fusionIn this paper, the main developments of magnetic confinement fusion with emphasis on confinement systemsThe scientific feasibility of magnetic confinement fusion has been demonstrated in JET, TFTR, JT-60,A fusion roadmap to DEMO and commercial fusion power plant has been established and steady progresses

Keywords： fusion energy     magnetic confinement     tokamak     structural material     superconducting magnet    

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Turbidity-adaptive underwater image enhancement method using image fusion

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 3, doi: 10.1007/s11465-021-0669-8

Abstract: Clear, correct imaging is a prerequisite for underwater operations. In real freshwater environment including rivers and lakes, the water bodies are usually turbid and dynamic, which brings extra troubles to quality of imaging due to color deviation and suspended particulate. Most of the existing underwater imaging methods focus on relatively clear underwater environment, it is uncertain that if those methods can work well in turbid and dynamic underwater environments. In this paper, we propose a turbidity-adaptive underwater image enhancement method. To deal with attenuation and scattering of varying degree, the turbidity is detected by the histogram of images. Based on the detection result, different image enhancement strategies are designed to deal with the problem of color deviation and blurring. The proposed method is verified by an underwater image dataset captured in real underwater environment. The result is evaluated by image metrics including structure similarity index measure, underwater color image quality evaluation metric, and speeded-up robust features. Test results exhibit that the method can correct the color deviation and improve the quality of underwater images.

Keywords： turbidity     underwater image enhancement     image fusion     underwater robots     visibility    

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M-LFM: a multi-level fusion modeling method for shape−performance integrated digital twin of complex

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 4, doi: 10.1007/s11465-022-0708-0

Abstract: developing a new digital twin framework that includes simulation data, measuring data, multi-level fusion

Keywords： shape−performance integrated digital twin (SPI-DT)     multi-level fusion modeling (M-LFM)     surrogate model     telescopic boom crane     data fusion    

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Numerical simulation of bituminous coal combustion in a full-scale tiny-oil ignition burner: influence

Zhengqi LI, Chunlong LIU, Xiang ZHANG, Lingyan ZENG, Zhichao CHEN

Frontiers in Energy 2012, Volume 6, Issue 3,   Pages 296-303 doi: 10.1007/s11708-012-0191-0

Abstract: The progression of ignition was numerically simulated with the aim of realizing a full-scale tiny-oilignition burner that is identical to the burner used in an 800 MWe utility boiler.

Keywords： numerical simulation     tiny-oil ignition burner     pulverized coal     temperature field    

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Influence of nozzle height to width ratio on ignition and NO

Liutao SUN, Yonghong YAN, Rui SUN, Zhengkang PENG, Chunli XING, Jiangquan WU

Frontiers in Energy 2021, Volume 15, Issue 2,   Pages 431-448 doi: 10.1007/s11708-021-0726-3

Abstract: To improve the ignition behavior and to reduce the high NO emissions of blended pulverized fuels (PFThe combustion tests indicate that the flame stability, ignition performance, and fuel burnout ratioThe smaller / delayed ignition and caused the flame to concentrate excessively on the axis of the furnaceNO emissions at the outlet of the primary zone decreased from 447 to 354 mg/m (O = 6%), and the ignition

Keywords： rectangular jet burner     nozzle height to width ratio     ignition characteristics     pyrolyzed semicoke (SC)    

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Gradient-based compressive image fusion

Yang CHEN,Zheng QIN

Frontiers of Information Technology & Electronic Engineering 2015, Volume 16, Issue 3,   Pages 227-237 doi: 10.1631/FITEE.1400217

Abstract: We present a novel image fusion scheme based on gradient and scrambled block Hadamard ensemble (SBHE)In the fusion phase, the image gradient is calculated to reflect the abundance of its contour informationFinally, inverse transformation is applied to the coefficients derived from fusion, and the fused imagequality in line with different fusion schemes.Furthermore, the gradient-based fusion scheme proposed in this paper can be applied in different fusion

Keywords： Compressive sensing (CS)     Image fusion     Gradient-based image fusion     CS-based image fusion    

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Title Author Date Type Operation

Frontier Issues and Progress of Controlled Nuclear Fusion Science and Technology

Gao Xiang,Wan Yuanxi,Ding Ning,Peng Xianjue

Journal Article

An experimental study on ignition of single coal particles at low oxygen concentrations

Wantao YANG, Yang ZHANG, Lilin HU, Junfu LYU, Hai ZHANG

Journal Article

Numerical study of ignition mechanism of n-heptane direct injection compression-ignition engine

Xiaoping GUO, Zhanjie WANG,

Journal Article

Influence of different oil feed rate on bituminous coal ignition in a full-scale tiny-oil ignition burner

Chunlong LIU, Qunyi ZHU, Zhengqi LI, Qiudong ZONG, Xiang ZHANG, Zhichao CHEN

Journal Article

Numerical simulation of combustion characteristics at different coal concentrations in bituminous coal ignitionin a tiny-oil ignition burner

Chunlong LIU, Qunyi ZHU, Zhengqi LI, Qiudong ZONG, Yiquan XIE, Lingyan ZENG

Journal Article

Ignition of Diesel by Heated Surface

Li Yuanlong,Lu Shouxiang,Fan Weicheng

Journal Article

Effect of distributions of fuel concentration and temperature on ignition processes in a diesel PCCI

Yang YU, Wanhua SU,

Journal Article

Study on electrical ignition and micro-explosion properties of HAN-based monopropellant droplet

Yonggang YU, Ming LI, Yanhuang ZHOU, Xin LU, Yuzhu PAN,

Journal Article

New experimental technique to determine coal self-ignition duration

ZHANG Xinhai, XI Guang, ZHANG Xinhai

Journal Article

Magnetic confinement fusion: a brief review

Chuanjun HUANG, Laifeng LI

Journal Article

Turbidity-adaptive underwater image enhancement method using image fusion

Journal Article

M-LFM: a multi-level fusion modeling method for shape−performance integrated digital twin of complex

Journal Article

Numerical simulation of bituminous coal combustion in a full-scale tiny-oil ignition burner: influence

Zhengqi LI, Chunlong LIU, Xiang ZHANG, Lingyan ZENG, Zhichao CHEN

Journal Article

Influence of nozzle height to width ratio on ignition and NO

Liutao SUN, Yonghong YAN, Rui SUN, Zhengkang PENG, Chunli XING, Jiangquan WU

Journal Article

Gradient-based compressive image fusion

Yang CHEN,Zheng QIN

Journal Article