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RISS 인기검색어
- 검색키워드
- 저자 : Mohammad Hassan Shojaeefard (검색결과 4 건)
- 무료
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FLAME PROPAGATION MODEL FOR A ROTARY ATKINSON CYCLE SI ENGINE
Mohammad Hassan Shojaeefard,Mojtaba Keshavarz 한국자동차공학회 2018 International journal of automotive technology Vol.19 No.1
The rotary Atkinson cycle engine includes two modes of combustion: combustion initiation and propagation in ignition chamber and then flame jet entrainment and propagation in expansion chamber. The turbulent flame propagation model is a predictive model for SI engines which could be developed for this type of combustion for the rotary Atkinson engine similar to the congenital engine with pre-chamber; in split combustion chamber SI engines, small amount of fuel is burned in pre-chamber while the fuel burned in ignition chamber of rotary Atkinson cycle is considerable. In this study a mathematical modeling of spherical flame propagation inside ignition chamber and new combined conical flame and spherical flame propagation model of a new two-stroke Atkinson cycle SI engine will be presented. The mathematical modeling is carried out using two-zone combustion analysis and the model also is validated against experimental tests and compared with previous study using non-predictive Weibe function model.
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Mohammad Hassan Shojaeefard,Amir Najibi 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.9
Nonlinear transient heat conduction analysis is developed for hollow thick temperature-dependent 2D-FGM cylinders subjected totransient non-uniform axisymmetric thermal loads. It is demonstrated here that the temperature-dependency in addition to the materialproperties variation in the 2D- FGM would lead to highly nonlinear governing equations. To do this, the graded finite element method isemployed to model the structures and a quadratic Lagrange shape function has been used to improve the accuracy of the temperaturedistribution for the two-dimensional heat conduction analysis. Furthermore, time variation of the temperatures and the effects of materialdistribution variability in two radial and axial directions and the temperature-dependency of the material properties on the temperature arediscussed in detail. It is assumed that the material, geometry and volume fraction distribution are axisymmetric but not uniform along theaxial direction. According to the results, the variation of the material properties in two dimensions has significant effect on temperaturedistribution; therefore, it gives more designing flexibility benefits to the designers to implement this kind of material for the thermal barrierspurposes.
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Taguchi optimization of micron sized lubricant oil droplet deposition on a hot plate
Mohammad Hassan Shojaeefard,Vahid Mousapour Khaneshan,Mohammad Ali Ehteram,Mostafa Akbari,Ehsan Allymehr 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.8
The deposition of micron sized lubricant oil droplets similar to oil droplets in blow-by gases of Internal combustion (IC) engines on ahot flat plate was studied using a round impinging jet configuration. Five parameters which simulate the different operational conditionsin IC engines were chosen: The impaction nozzle’s outlet diameter, additional air flow rate, plate angle, plate temperature, and nozzle tothe plate distance. An Experimental test-rig was constructed to acquire deposit weight with different parameter values. To find the conditionsof minimum deposition, the deposit’s weight was optimized using the Taguchi design of experiment method with respect to thedesign parameters. Using the experimental data, the predicted optimal value of the deposit weight was confirmed. Analysis of varianceshowed that plate angle is the most influential factor in deposition of fine oil droplets. Scanning electron microscopy (SEM) was used toinvestigate the mechanism of deposition.
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Gholam Reza Molaeimanesh,Mohammad Hassan Shojaeefard,Mohammad Reza Moqaddari 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.1
Proton-exchange membrane (PEM) fuel cells are one of the main candidates for propulsion systems of modern electric vehicles. However, appropriate water management is crucial to performance. Cell compression can affect the performance and water management of PEM fuel cells. Although the influence of cell compression on the transport of continuous water flow through the porous electrodes has been investigated, the influence of cell compression on the droplet dynamic behavior through these electrodes is not investigated thoroughly. Employing a pore-scale simulation method such as lattice Boltzmann method (LBM) is an excellent means for such investigation. In this study, LBM was applied to investigate the influence of compression of gas diffusion layer (GDL) on the removal of a water droplet from an electrode of a cell with interdigitated flow field. During removal process the droplet dynamic movement through five different GDLs (one without compression and the other four with four different levels of compression) was depicted and analyzed. The results reveal that the droplet experiences a faster removal process when the GDL is compressed. However, more increasing of compression does not result in a faster removal process, which indicates the existence of an optimum compression level for which the fastest removal process occurs.
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