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Experimental and Numerical Research on Strengthening the Performance of Wave Rotor Equipment with Curved Passages

Journal of Thermal Science 2023年第1期32卷 59-80页

作者： ZHAo Yiming LI Haoran hu dapeng Department of Chemical Machinery Dalian University of TechnologyDalian 116012China

The wave rotor technology is an energy exchanging approach that achieves efficient energy transfer between gases without using mechanical *** wave rotor technology has been successfully utilized in gas turbine cycle systems,gas expansion refrigeration and a variety of other industrial domains,yielding numerous researches and application *** structure of wave rotor passages inside which the energy exchange between gases is realized has an important impact on the equipment *** this study,based on gas wave ejection technology,the first application trials of an expansion wave rotor with curved passages were ***,the performance enhancing effect and mechanism of curved passages on the energy exchanging process were studied precisely by the combination of experimental and three-dimensional numerical simulation *** experimental results demonstrate that the curved passage rotor(CIR rotor)employed in this research has a maximum isentropic efficiency of 61.6%,and the CIR rotor achieves higher efficiency than the straight passage rotor(STR rotor)on all working conditions in this *** with the STR rotor,the maximum efficiency improving ratio of CIR rotor can exceed 14.2%at each experimental expansion ratio,and the maximum relative increments of ejection rate are more than 5%.In addition,the CIR rotor can also effectively increase the proportion of static pressure in total pressure of the medium-pressure gas,and reduce the device power *** three-dimensional numerical investigations revealed the principle of gas ejection in the wave rotors and explained why the CIR rotor performed *** to the numerical findings,the curved passages of the CIR rotor may effectively minimize various energy losses created in the processes of high-pressure gas incidence,exhausting flow in nozzle,and high-speed gas flow in the passages.

关键词： energy exchange wave rotor ejector curved passage experimental research

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Numerical and Experimental Study on Contact Face and Shock Wave Motion in the Receiving Tube of Gas Wave Refrigerator

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Journal of Thermal Science 2006年第4期15卷 337-341页

作者： dapeng hu Shengtao CHEN hu LIU Zuzhi CHEN Che Zhu Institute of Chemical Engineering Dalian University of Technology Dalian Liaoning China

The contact face and shock wave motion in an open ends receiving tube of gas wave refrigerator are investigated numerically and experimentally. The results show that, velocity of the contact face rises rapidly as gas is injected into the receiving tube, and drops sharply after a steady propagation. However, velocity of the shock wave in the tube is almost linear. With increasing of inlet pressure, velocity of the shock wave and steady velocity of contact face also increase. In addition, time and distance of contact face propagation in the receiving tube become longer.

关键词： contact face shock wave receiving tube gas wave refrigerator

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Numerical and experimental study on the refrigeration performance of a variable-section gas wave oscillation tube

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Science China(Technological Sciences) 2023年第2期66卷 489-500页

作者： WANG HaiTao LIU XinYu FU ZhongMeng hu dapeng LIU PeiQi Frontier Science Center for Smart Materials Dalian University of TechnologyDalian 116024China

This paper introduces the refrigeration cycle process of the gas wave oscillation tube(GWOT).Aiming at the problem that the strong reverse compression waves generated during the refrigeration process affect the performance,this paper proposes a variable-section GWOT that weakens the reverse compression waves and a variable-section structure designed using a numerical *** showed that the variable-section structure could reduce the intensity of the incident shock wave by approximately 7%and the total entropy production in the refrigeration cycle by approximately 8%under the design ***,the variable-section structure can effectively weaken the strength of the reverse compression waves and improve the refrigeration efficiency by approximately 4%under the same working *** variable-section structure can also widen the highperformance working range of the *** experimental results reveal that the high-performance working range can be expanded by more than two times under the design *** research can guide the subsequent development of gas wave refrigeration technology and a reference for other wave rotor application technologies.

关键词： gas wave oscillation tube variable-section refrigeration pressure fluctuation entropy production rate wave rotor

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Numerical investigation on freeze-drying of aqueous material frozen with pre-built pores

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Chinese Journal of Chemical Engineering 2016年第1期24卷 116-125页

作者： Wei Wang dapeng hu Yanqiu Pan Guohua Chen Department of Chemical Machinery Dalian University of Technology Department of Chemical Engineering Dalian University of Technology Department of Chemical and Biomolecular Engineering Hong Kong University of Science and Technology

Freeze-drying of the initially porous frozen material with pre-built pores from liquid material was found experimentally to save drying time by over 30% with an initial saturation being 0.28 compared with the conventional operation with the initial saturation being 1, using mannitol as the solid material. In order to understand the mass and heat transfer phenomena of this novel process, a two-dimensional mathematical model of coupled mass and heat transfer was derived with reference to the cylindrical coordinate system. Three adsorption–desorption equilibrium relationships between the vapour pressure and saturation value namely, power-law, Redhead's style and Kelvin's style equation, were tested. Kelvin's style in exponential form of adsorption equilibrium relation gave an excellent agreement between the model prediction and experimental measurement when the equation parameter, γ, of 5000 was applied. Analyses of temperature and ice saturation profiles show that additional heat needs to be supplied to increase the sample temperature in order to promote the desorption process. Simulation also shows that there is a threshold initial porosity after which the drying time decreased with the increase in the initial porosity. Enhanced freeze-drying is expected to be achieved by simultaneously enhancing mass and heat transfer of the process.

关键词： Adsorption Desorption Drying time Mass transfer Porous material Sublimation

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HYSYS Automation and Its Application on Evaluation of Plate Heat Exchanger

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China Petroleum Processing & Petrochemical Technology 2008年第3期10卷 55-59页

作者： Dai Yuqiang Liu Wenwei Wang Shaomin hu dapeng College of Chemistry and Chemical Engineering Dalian University of Technology Dalian 116012 China China Liaohe Petroleum Engineering Co. Ltd Institute of Chemical Process System Engineering Dalian University of Technology

When simulating or designing plate heat exchangers for multicomponent mixtures, most designers are often perplexed with the question on how to choose or estimate the physical property param- eters and hope to have a reliable database that could be adopted. The commercial codes HYSYS supply the physical property package on over 1500 pure substances and over 16 000 binary coefficients for them. This work has briefly presented an efficient communication interface based on the Microsoft Component Object Model （COM） between inner plate heat exchanger simulation codes and the HYSYS package. The application of a custom-made HYSYS-COM interface has shown high efficiency, such as significant reduction of time needed for evaluating each process stream＇s properties. This automation method can be conveniently extended to further optimization study for any specific operation device such as heat transfers, columns, and other facilities.

关键词： HYSYS automation plate heat exchanger Component Object Model (COM)

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Study on Wall Temperature Distribution of Oscillating Tube

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Journal of Thermal Science 2009年第3期18卷 246-252页

作者： dapeng hu Peiqi LIU Wenjing ZHAO Che Zhu Yudong WANG Yuqiang DAI Jiupeng ZOU Institute of Chemical Engineering Dalian University of Technology Dalian 116012 Liaoning China Xin Jiang Xin Jie co. Ltd Wulumuqi 830011 Xinjiang China

The wall temperature distribution and heat transfer process of the oscillating tube have been investigated in thispaper using both numerical simulation and experimental method. The wall temperature of oscillating tube increasesrapidly in the inlet and then decreases slowly, moreover, the rally phenomenon of wall temperature nearthe closed end is observed. With the increase of jet flow frequency, the highest wall temperature increases and thelocation of that moves towards the inlet. The velocity of pressure wave in the oscillating tube almost remainsconstant even its intensity changes. The quantity of heat transfer between the gas and inner wall of the oscillatingtube determines the wall temperature of every location, and the pressure wave disturbance can cause the heattransfer quantity change. Each pressure wave has its own disturbance range. The wall temperature distribution canbe explained by the change of pressure wave intensity and its disturbance time. Besides, the step and rally of walltemperature are discussed, which shows that the conditions of heat transfer can be improved due to intersection orreflection of pressure waves.

关键词： thermal separator oscillating tube pressure wave numerical simulation.

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Functional delivery vehicle of organic nanoparticles in inorganic crystals

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Chinese Chemical Letters 2019年第12期30卷 2351-2354页

作者： Linlin Kong Xinyi Jin dapeng hu Leyun Feng Dong Chen Hanying Li Institute of Process Equipment College of Energy EngineeringZhejiang UniversityHangzhou 310027China State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang UniversityHangzhou 310027China MOE Key Laboratory of Macromolecular Synthesis and Functionalization State Key Laboratory of Silicon MaterialsDepartment of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027China

Encapsulation of bioactive substances for extended shelf life and controlled,targeted release is critical for their applications in food and drug ***,a new method has been developed to encapsulate bioactive molecules in the crystal composites,showing greatly enhanced stability and unique pHtriggered ***,a model bioactive,is first loaded in shellac nanoparticles via coprecipitation with a high encapsulation efficiency,and then the chlorophyll-loaded nanoparticles are incorporated into calcite crystals grown from a gel media containing the *** the protection of shellac nanoparticles and calcite crystals,chlorophyll shows excellent stability even under *** chlorophyll could only be released by first dissolving the calcite crystals under acidic condition and then dissolving the shellac nanoparticles under alkaline *** unique pHtriggered release mimics the pH change from acidic in the stomach to alkaline in the intestine and is thus well suited for controlled,targeted intestinal *** work suggests that the crystal composites are an ideal delivery vehicle for the functional design of bioactive molecules.

关键词： Nanoparticle Calcite crystal Encapsulation Chlorophyll Dual-pH responses

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Study on gas and wave in a receiving tube

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Journal of Thermal Science 2008年第2期17卷 170-174页

作者： dapeng hu Shengtao Chen Jun Yang Zuzhi Chen Yuqiang Dai Che Zhu Runjie Liu Institute of Chemical Engineering Dalian University of Technology Dalian Liaoning China

The gas and wave＇s motion in a receiving tube are investigated numerically and experimentally in the present paper. The results show that, velocity of the contact face rises rapidly as gas is injected into the receiving tube, and then drops sharply after a steady propagation. However, velocity of the wave in the tube is almost linear and the wave can be reflected at the close end of the receiving tube. With increasing of inlet pressure, velocity of the wave and steady velocity of contact face also increase. There is obvious thermal effect as the wave sweeps the gas. The reflected wave can heat the exhausting gas in the open end. As an absorber, an expander and a shrink in the robe can almost completely absorb the reflected wave.

关键词： contact face wave receiving tube absorber

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Study on wave rotor refrigerators

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Frontiers of Chemical Science and Engineering 2009年第1期3卷 83-87页

作者： Yuqiang DAI dapeng hu Meixia DING College of Chemistry and Chemical Engineering Dalian University of TechnologyDalian 116012China

As a novel generation of a rotational gas wave machine,the wave rotor refrigerator(WRR)is an unsteadyﬂow device used for refrigeration,in whose passages pressured streams directly contact and exchange energy due to the movement of pressure *** this paper,the working mechanism and refrigeration principle are inves-tigated based on the one-dimensional unsteadyﬂow theory.A basic limitation on main structural parameters and operating parameters is deduced and the wave diagram of WRR to guide designing is *** main inﬂuential factors are studied through an *** the DUT Gas Wave Refrigeration Studying and Development Center(GWRSDC)lab,the isentropic efﬁciency can now reach about 65%.The results show that the WRR is a feasible and promising technology in pressured gas refrigeration cases.

关键词： wave rotor refrigeration unsteadyﬂow theory wave diagram

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Feasibility of Intermediate Fluid Vaporizer with Spiral Wound Tubes

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China Petroleum Processing & Petrochemical Technology 2013年第1期15卷 73-77页

作者： Liu Fengxia Dai Yuqiang Wei Wei Zou Jiupeng Zhu Che Dong Chao hu dapeng School of Chemical Machinery Engineering Dalian University of Technology

A novel intermediate fluid vaporization (IFV) technology for LNG re-gasification process with spiral-wound heat exchanging tubes is proposed. The new IFV project combines the advantage of running the shell and tube heat exchangers at high pressure with the advantage of compact space of heat exchangers. Thermal analysis on the two processes of forced convection and vaporization type heat transfer in the spiral wound tubes and vapor condensation /re-boiling type of heat transfer via intermediate fluid in shell side shows the feasibility of this promising technology.

关键词： spiral-wound heat exchanger intermediate fluid type vaporizer LNG vaporizer

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