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| 1 | Waste heat recovery from heavy-duty diesel engine exhaust gases by medium temperature ORC system显示文摘A medium-temperature waste-heat recovery system based on the organic Rankine cycle (ORC) is designed to recover the exhaust energy from a heavy-duty diesel engine. Analysis of the 1st law of thermodynamics for an ORC system is performed. This analysis contains two parts. The first part is an analysis with undefined heat exchangers to gain an understanding of the ORC and find out suitable organic fluid parameters for a better ORC efficiency. The second part of the analysis uses combined engine test results and two designs of heat exchangers. By comparing the two designs, an improved system of heat exchangers is described. This analysis also quantifies the effect of engine parameters on ORC system. The study concludes that the supercritical Rankine cycle is a better approach towards waste heat recovery. The ORC system is found to perform better under part-load conditions if the medium-high power condition rather than rated working point of the engine is used as the design parameter. The ORC system achieves the highest waste-heat recovery efficiency of up to 10-15% for the optimised heat ex-changer design. | WEI MingShan FANG JinLi MA ChaoChen DANISH Syed Noman | 2011 | Science China(Technological Sciences)2011，54，10： | 16 |
| 2 | The Change of the Inlet Geometry of a Centrifugal Compressor Stage and its Influence on the Compressor Performance显示文摘The impact on the compressor performance is important for designing the inlet pipe of the centrifugal compressor of a vehicle turbocharger with different inlet pipes. First, an experiment was performed to determine the compressor performance from three cases: a straight inlet pipe, a long bent inlet pipe and a short bent inlet pipe. Next, dynamic sensors were installed in key positions to collect the sign of the unsteady pressure of the centrifugal compressor. Combined with the results of numerical simulations, the total pressure distortion in the pipes, the pressure distributions on the blades and the pressure variability in the diffuser are studied in detail. The results can be summarized as follows: a bent pipe results in an inlet distortion to the compressor, which leads to performance degradation, and the effect is more apparent as the mass flow rate increases. The distortion induced by the bent inlet is not only influenced by the distance between the outlet of the bent section and the leading edge of the impeller but also by the impeller rotation. The flow fields in the centrifugal impeller and the diffuser are influenced by a coupling effect produced by the upstream inlet distortion and the downstream blocking effect from the volute tongue. If the inlet geometry is changed, the distributions and the fluctuation intensities of the static pressure on the main blade surface of the centrifugal impeller and in the diffuser are changed accordingly. | WANG Leilei YANG Ce ZHAO Ben LAO Dazhong MA Chaochen LI Du | 2013 | Journal of Thermal Science2013，22，3： | 13 |
| 3 | A review of fundamental factors affecting diesel PM oxidation behaviors显示文摘Diesel particulate matter(DPF) is usually employed to meet the stringent regulations on particulate matter(PM) emissions for diesel engine. To resolve the DPF regeneration problem, comprehensive information about the factors influencing PM oxidation behaviors must be understood. Large amounts of factors related to PM oxidation activity have been investigated, however, some relations are still ambiguous. This paper reviews the factors related to PM oxidation activity that the factors are divided into the engine-correlated and engine-uncorrelated factors. The methods with both advantages and disadvantages to test the oxidation behaviors are introduced. The microstructure and ingredient being fundamental factors affecting PM oxidation behaviors are as the principle line to correlate PM oxidation behaviors and engine-correlated factors. The relations of engine-correlated factors with oxidation behaviors are obtained though advanced technologies that are mutual complementation. The engine-uncorrelated factors are also reviewed that these factors are vital to oxidation activity changes. Multiple-factor analysis rather than single-factor analysis should be developed to make the oxidation behaviors of diesel PM more clear. | GAO JianBing MA ChaoChen XING ShiKai SUN LiWei HUANG LiYong | 2018 | Science China(Technological Sciences)2018，61，3： | 8 |
| 4 | Forced Responses on a Radial Turbine with Nozzle Guide Vanes显示文摘Radial turbines with nozzle guide vanes are widely used in various size turbochargers.However,due to the interferences with guide vanes,the blades of impellers are exposed to intense unsteady aerodynamic excitations,which cause blade vibrations and lead to high cycle failures(HCF).Moreover,the harmonic resonance in some frequency regions are unavoidable due to the wide operation conditions.Aiming to achieve a detail insight into vibration characteristics of radial flow turbine,a numerical method based on fluid structure interaction(FSI) is presented.Firstly,the unsteady aerodynamic loads are determined by computational fluid dynamics(CFD).And the fluctuating pressures are transformed from time domain to frequency domain by fast Fourier-transform(FFT).Then,the entire rotor model is adopted to analyze frequencies and mode shapes considering mistuning in finite element(FE) method.Meanwhile,harmonic analyses,applying the pressure fluctuation from CFD,are conducted to investigate the impeller vibration behavior and blade forced response in frequency domain.The prediction of the vibration dynamic stress shows acceptable agreement to the blade actual damage in consistent tendency. | LIU Yixiong YANG Ce MA Chaochen LAO DaZhong | 2014 | Journal of Thermal Science2014，23，2： | 3 |
| 5 | for improving diesel engine Development of Turbocharge matching performance 显示文摘 | Zhang Hong Ma Chaochen | 2002 | Journal of Beijing of technology2002，，14： | 1 |
| 6 | Experi- mental study on the nitrogen dioxide and particulate matter emissions from diesel engine retrofitted with particulate oxi- dation catalyst显示文摘 | FENG Xiangyu GE Yunshan MA Chaochen | 2014 | Science of the Total Environment2014，472，： | 1 |
| 7 | Investigation on the Forced Response of a Radial Turbine under Aerodynamic Excitations显示文摘Rotor blades in a radial turbine with nozzle guide vanes typically experience harmonic aerodynamic excitations due to the rotor stator interaction. Dynamic stresses induced by the harmonic excitations can result in high cycle fatigue(HCF) of the blades. A reliable prediction method for forced response issue is essential to avoid the HCF problem. In this work, the forced response mechanisms were investigated based on a fluid structure interaction(FSI) method. Aerodynamic excitations were obtained by three-dimensional unsteady computational fluid dynamics(CFD) simulation with phase shifted periodic boundary conditions. The first two harmonic pressures were determined as the primary components of the excitation and applied to finite element(FE) model to conduct the computational structural dynamics(CSD) simulation. The computed results from the harmonic forced response analysis show good agreement with the predictions of Singh's advanced frequency evaluation(SAFE) diagram. Moreover, the mode superposition method used in FE simulation offers an efficient way to provide quantitative assessments of mode response levels and resonant strength. | MA Chaochen HUANG Zhi QI Mingxu | 2016 | Journal of Thermal Science2016，25，2： | 1 |
| 8 | Experiment and surge analysis of centrifugal two-stage turbocharging system 显示文摘 | HE Yituan MA Chaochen | 2008 | Frontiers of Mechanical Engineering in China2008，3，4： | 1 |
| 9 | Development of Mixed-flow Tur-bine for H1F Turbocharger显示文摘 | MA Chaochen SHI Xin | 2000 | Journal of Beijing Institute of Technology2000，9，4： | 1 |
| 10 | Research on the critical speed of a mixed-flow turbocharger with hybrid ceramic ball bearing显示文摘 | Huang Ruo Ge Xinbin Ma Chaochen | 2009 | Journal of Beijing Institute of Technology:English Edition2009，18，3： | 1 |
| 11 | Finite element analysis on crack tip' s SIF of a turbocharger impeller显示文摘 | ZHAO Junsheng MA Chaochen | 2005 | Journal of Beijing Institute of Technology2005，15，： | 1 |
| 12 | Lightening structure optimization on turbine wheel of ve- hicular turbocharger 显示文摘 | Zhao Junsheng Ma Chaochen Hu Liaoping | 2008 | Frontiers of Energy and Power Engineering in China2008，2，4： | 1 |
| 13 | Steady-state experimental studies on a multi-effect thermal regeneration solar desalination unit with horizontal tube falling film evaporation显示文摘 | Chen Ziqian Zheng Hongfei He Kaiyan Ma Chaochen | 2007 | Desalination2007，207，123： | 1 |
| 14 | Emission characteristics of a heavy-duty diesel engine at simulated high altitudes显示文摘 | Chao He Yunshan Ge Chaochen Ma Jianwei Tan Zhihua Liu Chu Wang Linxiao Yu Yan Ding | 2010 | Science of the Total Environment2010，，17： | 1 |
| 15 | Numerical Investigation & Comparison of a Tandem-Bladed Turbocharger Centrifugal Compressor Stage with Conventional Design显示文摘Extensive numerical investigations of the performance and flow structure in an unshrouded tandem-bladed centrifugal compressor are presented in comparison to a conventional compressor.Stage characteristics are explored for various tip clearance levels,axial spacings and circumferential clockings.Conventional impeller was modified to tandem-bladed design with no modifications in backsweep angle,meridional gas passage and camber distributions in order to have a true comparison with conventional design.Performance degradation is observed for both the conventional and tandem designs with increase in tip clearance.Linear-equation models for correlating stage characteristics with tip clearance are proposed.Comparing two designs,it is clearly evident that the conventional design shows better performance at moderate flow rates.However;near choke flow,tandem design gives better results primarily because of the increase in throat area.Surge point flow rate also seems to drop for tandem compressor resulting in increased range of operation. | Syed Noman Danish Shafiq Rehman Qureshi Abdelrahman EL-Leathy Salah Ud-Din Khan Usama Umer Ma Chaochen | 2014 | Journal of Thermal Science2014，23，6： | 0 |
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