Showing papers by "Gequn Shu published in 2014"
TL;DR: In this paper, the performance comparison between cyclic Alkane-based ORC and steam cycle with relative pressure is carried out, and the maximum improvement of 10% in brake performance and fuel consumption is obtained for DE-ORC combined systems with cyclohex-ane used as working fluid.
212 citations
TL;DR: In this article, a dual-loop organic Rankine cycle (DORC) is proposed, which consists of a high-temperature (HT) loop and a lowtemperature loop to recover the waste heat of the exhaust, engine coolant and residual heat.
174 citations
TL;DR: In this article, the authors investigated the effect of EGR and fuel evaporation on charge cooling and particle number (PN) emissions of a direct injection spark ignition engine (DISI) operating on ethanol/gasoline and n-butanol/gasesoline blends with exhaust gas recirculation (EGR) were studied.
146 citations
TL;DR: In this paper, the effects of retardants mass fraction, evaporation temperature and IHE (internal heat exchanger) on the performance of a high temperature ORC were investigated.
128 citations
TL;DR: In this article, a two-stage TEG model is built using the exhaust gas of an internal combustion engine (ICE) as heat source, and the results show that the absorbed heat, output power, and conversion efficiency increase significantly with increasing heat transfer coefficient up to the value of 400 Wm−m−2 K−1.
118 citations
TL;DR: In this paper, a 3D numerical model for engine exhaust-based thermoelectric generator (ETEG) system is developed, and the exhaust channel size needs to be moderate to balance the heat transfer to TEG modules and pressure drop along channel.
108 citations
TL;DR: In this article, a Multi-Approach Evaluation System (MA-ES) is established to provide comprehensive evaluations on organic Rankine Cycle (ORC) used for waste heat utilization.
86 citations
TL;DR: In this paper, the combustion and emissions characteristics of 10% volume fraction 2-methylfuran gasoline blend fuel (M10) were investigated experimentally in a single-cylinder four-stroke SI engine at various engine speeds and wide open throttle (WOT).
72 citations
TL;DR: In this article, the performance of two-stage serial and parallel thermoelectric generators with low-temperature bismuth telluride and medium temperature skutterudite was investigated.
71 citations
TL;DR: In this article, the authors compared the performance of EERS on heavy-duty diesel engines and light-duty vehicle gasoline engines using water, R141b, R123 and R245fa as working fluids.
60 citations
TL;DR: In this paper, a regenerative transcritical dual-loop organic Rankine cycle is proposed to recover the waste heat of the exhaust, engine coolant and all the residual heat in the HT loop.
TL;DR: In this paper, the authors systematically review the series of physical and chemical phenomena involved in knocking combustion, including auto-ignition, gas-dynamic waves, cavity resonance, and autoignited flame propagation.
Abstract: Knocking combustion in spark-ignition (SI) engines is a typical abnormal combustion phenomenon that severely limits engine performance and thermal efficiency. However, its mechanism has not so far been completely revealed, such as the origin of pressure oscillation with tremendous amplitude and broken mechanisms of the engine body when knock occurs. This article systematically reviews the series of physical and chemical phenomena involved in knocking combustion, including auto-ignition, gas-dynamic waves, cavity resonance, and auto-ignited flame propagation. Significant research has shown that the rapid heat release of end-gas auto-ignition and subsequent strong pressure waves play a crucial role during knocking combustion. A methodology of the interaction of flame propagation and pressure waves has been proposed to reveal knock formation in terms of positive feedback between strengthened pressure waves and auto-ignited flame propagation. Also, new suggestions on the weakness in prior research of knocking...
TL;DR: In this article, the effect of exhaust gas recirculation (EGR), compression ratio and boost pressure on cyclic variation was investigated by means of both experiments and simulation for a port fuel injection (PFI) engine.
TL;DR: In this paper, the effects of lubricating oil additive diesel fuel on the diesel engine emission particles characterizations, such as size distribution, morphology, nanostructure and composition was investigated on a light-duty diesel engine.
TL;DR: In this paper, the authors presented a performance analysis of a novel electricity-cooling cogeneration system (ECCS) which combines a Rankine cycle (RC) with an absorption refrigeration cycle (ARC) to recover the exhaust heat of marine engine aboard ships.
TL;DR: In this article, the effects of different fuels on size distribution, morphology, and nanostructure of diesel particles were studied using transmission electron microscopy (TEM) and high resolution TEM (HRTEM).
TL;DR: In this article, the impact of exhaust gas recirculation (EGR) rates, from 0% to 15%, and compression ratio (CR) of 8, 9, and 10 on the combustion characteristics and emission performance of 2-methylfuran (MF) and gasoline were studied.
TL;DR: In this paper, a coupling of pressure wave equation and KIVA-3V code with reduced chemical kinetic scheme has been conducted to systematically investigate pressure oscillation characteristic during knocking cycles based on a SI engine.
TL;DR: In this paper, an approach of exhaust heat dissociating methanol was investigated, which is a kind of method for IC engine exhaust heat recovery (EHR), and the improvement to IC engine performance and the conversion efficiency of recovered exhaust gas energy can be evaluated by comparing the performances of IC engine fueled with various kinds of fuels (or their compositions).
01 Apr 2014
TL;DR: In this paper, the authors presented a model system TEG-DORC that employs thermoelectric generator (TEG) as a topping cycle integrated with a dual-loop organic Rankine bottoming cycle to recover exhaust heat of internal combustion engine (ICE).
Abstract: This paper presents a model system TEG-DORC that employs
thermoelectric generator (TEG) as a topping cycle integrated
with a dual-loop organic Rankine bottoming cycle (DORC) to
recover exhaust heat of internal combustion engine (ICE). The
thermodynamic performance of TEG-DORC system is
analyzed based on the first and second law of thermodynamics
when system net output power Wnet, thermal efficiency ηth,
exergy efficiency ηe and volumetric expansion ratio are chosen
as objective functions. The model has many parameters that
affect combined system performance such as TEG scale,
evaporation pressure of high temperature ORC loop (HT loop)
Pevp,HT, condensation temperature of HT loop Tcond,HT. It is
suggested that HT loop has a vital influence on system
performance. The results show that TEG-DORC system can
significantly improve system performance, and system net
output power gets maximum (30.69kW) when Tcond,HT is 370K
and Pevp,HT is 4MPa, accordingly, the absolute effective thermal
efficiency increases by 5.2%. The maximum thermal efficiency
and exergy efficiency are 26.39% and 53.08% respectively.
And applying TEG modules can't promote DORC system
performance as expected.
TL;DR: In this paper, the influence of a pour point depressant additive (PPD) on particle emissions and particle size distributions from a four-cylinder turbocharged, inter-cooled engine with CF-4 15W-40 lubricant, using diesel or diesel containing the PPD.
TL;DR: In this paper, the root cause of axial vibration of crankshafts for high speed diesel engines based on an auto-regressive and moving average model and the analytic hie...
Abstract: This paper presents a method to identify the root cause of the axial vibration of crankshafts for high speed diesel engines based on an auto-regressive and moving average model and the analytic hie...