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	1. The effect of ignition delay period on heat release of hydraulic free piston engine
	ZHANG Shuanlu,ZHAO Changlu,ZHAO Zhenfeng
	Dynamic and Electronic Engineering 19 December 2014
	Show/Hide Abstract \| Cite this paper︱Full-text: PDF (4K B)

	Abstract:The special characteristic of hydraulic free piston diesel engine decides its differences in the aspects of piston displacement, velocity, and acceleration etc. These differences lead to more complex fluid flow, and particular intrinsic energy distribution in-cylinder. All these factors results in the differences of heat release. This article shows the heat release rate difference between the start cycles and the stable cycles and deems that the difference is related with the ignition delay period. From the expression equation of ignition delay period, the reason is ascribed to the boundary temperature. Based on selection of several cycles, we study the maximum value of heat release rate and pressure in-cylinder and it is obvious that the ignition delay period affects the heat release rate, pressure and BDC position. Finally, the corresponding optimum proposals for decreasing the difference are also represented.
	TO cite this article:ZHANG Shuanlu,ZHAO Changlu,ZHAO Zhenfeng. The effect of ignition delay period on heat release of hydraulic free piston engine[OL].[19 December 2014] http://en.paper.edu.cn/en_releasepaper/content/4624354


	2. Methods to measure MEA status in PEM fuel cell and the effects of test conditions
	PEI Pucheng,XU Huachi,ZENG Xia
	Dynamic and Electronic Engineering 28 February 2013
	Show/Hide Abstract \| Cite this paper︱Full-text: PDF (4K B)

	Abstract:To measure and monitor the membrane electrode assembly (MEA) status, the cyclic voltammetry (CV) and galvanostatic method are improved and compared. The electrochemical active surface area (EAS), double layer capacitance, H2 crossover current are measured by both the CV and galvanostatic method, and the cell resistance is also gained by the galvanostatic method. In the galvanostatic method, two or more constant currents are applied to a fuel cell stack, and the voltage responds between two electrodes of every cell are recorded and analyzed. Tests on a two-cell stack supplied with hydrogen in the anode and nitrogen in the cathode are carried out, and the influences of the temperature and relative humidity (RH) on the MEA parameters are investigated. Results show that with an increase in RH, both the double layer capacitance and EAS linear increase, while the hydrogen crossover current and cell resistance linear decrease; and with an increase in temperature, the hydrogen crossover current linear increases, cell resistance decreases, EAS and double layer capacitance show little change. The galvanostatic method shows a convenient technique to research the cell uniformity and the MEA lifetime in fuel cell stack.
	TO cite this article:PEI Pucheng,XU Huachi,ZENG Xia. Methods to measure MEA status in PEM fuel cell and the effects of test conditions[OL].[28 February 2013] http://en.paper.edu.cn/en_releasepaper/content/4524609


	3. An investigation on anti-flooding of PEMFC with in-plate adverse-flow flow-field
	LI Pengcheng,PEI Pucheng,HE Yongling,ZHANG Hongfei
	Dynamic and Electronic Engineering 27 February 2013
	Show/Hide Abstract \| Cite this paper︱Full-text: PDF (4K B)

	Abstract:The stoichiometric ratios and related regimes, which can promote anti-flooding of polymer electrolyte membrane fuel cell (PEMFC) with in-plate adverse-flow flow-field (IPAF), were investigated in this paper. Two flow combinations, which are the simple and complex adverse-flow between plates (ABP) that can be realized by IPAF, were employed to investigate. Constant stoichiometric ratios examination indicates that the complex ABP could improve anti-flooding of PEMFC better in the medium (greater than 200mA/cm2 and less than 1000mA/cm2) and high (greater than 1000mA/cm2) current densities than the simple ABP. More stoichiometric ratios were introduced to find the cathode critical stoichiometry. Under the condition of cathode critical stoichiometry, the maximal local relative humidity of both electrodes of complex ABP is equal to 100% and below while the anti-flooding of the cathode of simple ABP is not satisfactory in the medium and high current densities. Further study shows that the mechanism of fuel cell, which is the interdependence between the electrodes effect, can make significant contribution to anti-flooding.
	TO cite this article:LI Pengcheng,PEI Pucheng,HE Yongling, et al. An investigation on anti-flooding of PEMFC with in-plate adverse-flow flow-field[OL].[27 February 2013] http://en.paper.edu.cn/en_releasepaper/content/4524116


	4. Design Optimization of Axisymmetric Endwall in Axial Compressor S-Shaped Duct
	Jin Donghai,Zhao Weiguang,Gui Xingmin
	Dynamic and Electronic Engineering 06 January 2013
	Show/Hide Abstract \| Cite this paper︱Full-text: PDF (4K B)

	Abstract:This paper presents a numerical investigation on the potential aerodynamic benefits of using endwall contouring in a fairly aggressive duct with six struts based on the platform of the endwall design optimization. The platform was built with Adaptive Genetic Algorithm (AGA), Design of Experiments (DOE), Response Surface Methodology (RSM) based on the Artificial Neural Network (ANN) and a 3D Navier-Stokes solver. Visual analysis method based on DOE was used to define the design space and analyse the impact of the design parameters on the target function (response). Optimization of axisymmetric endwall contouring in the duct has been performed and evaluated. The objective was to minimize the total pressure loss. The optimal duct was found to reduce the hub corner separation and suppress the migration of the low momentum fluid. The axisymmetric endwall contouring was shown to suppress the separation and reduce the net duct loss by 22%.

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