Effect of compression ratio, injection pressure and biodiesel blend on CI engine fuelled with Pongamia biodiesel using Taguchi robust method


The effect of pongamia bio diesel blending ratio, compression ratio and injection pressure on emission characteristics of a variable ratio compression ignition engine was investigated. Emission characteristics were studied when the engine was operated using the different blends (B10, B20) and normal diesel fuel (B0). The investigation was carried out to optimize the levels of parameters by Taguchi method. The tests have been designed using an L orthogonal array with four factors 27 and three levels each. According to the results, compression ratio and bio fuel blend play the significant role on the exhaust emission. Furthermore, the estimated optimum values of the process factors for obtaining lower CO and HC are compression ratio of 21, injection pressure of 180 bar, bio diesel blend of 20%. The result shows that the compression ratio and biodiesel blend % are the most significant factors influencing exhaust emission followed by injection pressure. The results showed that lower CO and HC emission were observed at increased compression ratio. An increase in compression ratio results in decrease in nitrogen oxide emissions.

Keywords: Pongamia bio diesel, variable ratio compression ignition engine, emission, Taguchi method, L orthogonal 27 array, Analysis of Variance

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Experimental study on partial replacement of cement with metakaolin and coarse aggregate with shredded plastic waste

Dec 2017 / by M. SIVARAJ and R. SUNDARARAJAN

Concrete is a composite material made from cement, water, fine aggregate and coarse aggregate. But present researchers are interested in finding new cementing materials by waste materials or waste products produced from industries. Metakaolin is a cementitious material used as an admixture to produce high strength and it is used for maintaining the consistency of concrete. The use of plastics is increasing day by day although steps were taken to reduce its consumption. This creates substantial garbage every day which is unhealthy. The cement is partially replaced by metakaolin (2.5%, 5%, 7.5% and 10% by weight) to improve the strength, durability and reduces the porosity of concrete and it is the best way of environmental friendly disposal of plastic. The properties of materials (physical and chemical) were studied meanwhile the strength characteristics (M20) such as 20 compressive strength, split tensile strength and flexural strength test results were found by the companion specimens like cubes, cylinders, prisms and beams.

Keywords: Cement, compressive strength metakaolin, shredded plastic waste, partial replacement, split tensile strength and flexural strength

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Static structural analysis and comparison between aluminium matrix, aluminium-graphite composite and aluminium-graphite-boron carbide composite

Dec 2017 / by FAISAL M. H. and PRABAGARAN S.

Better sliding lubricating effect of graphite in aluminum/ graphite composites makes them to be used as self-lubricating materials in industrial and automobile areas. Sliding contacts such as piston, bearings, sheaves, cylinder liners etc. uses such composites in order to reduce the external lubricant consumption and to achieve better sliding lubricant effect. This also helps to minimise the use of external toxic petroleum based lubricants in sliding contacts for better environment and decrease wastage of energy in automobile and industrial components. But due to the graphite content, deterioration in mechanical properties of Al/Gr composites occurs. This problem can be avoided by adding hard reinforcement particles to Al/Gr composites and thus making the composite hybrid. Due to excellent properties, boron carbide particles with varying wt% of 3, 5 and 7 are used for preparation of hybrid composite. LM13 aluminium alloy is the matrix material used. Stir casting technique is employed for the preparation of Al/Gr 2% and Al/B4C/Gr 2% composites. Using CREO a 3D piston model was created and static structural analysis of unreinforced aluminium alloy, Al/Gr self-lubricating composite and Al/B4C/Gr hybrid aluminium 4 composites are performed using ANSYS 14.5 workbench software. Better static structural properties were observed for Al/B4C/Gr composites compared to the self-lubricating 4 composite.

Keywords: Boron carbide, graphite, hybrid aluminium matrix composite, LM13

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Experimental studies on flexural behaviour of composite beams with SCC–M30

Dec 2017 / by S. SATHYAN and R. SUNDARARAJAN

Composite sections are more extensively used in foreign countries to attain more structural efficiency, Cold-formed sheets are used to decrease the dead load and thereby adding additional tension reinforcement it can take heavy loads and improve the structural efficiency. Therefore cold formed fabricated sections with concrete acts as an effecting lateral restraint and further increasing load carrying capacity of beam by using self-compacting concrete of grade M30. The bar surface acts as a cover for the web and improves as fire resistance to the section to a certain extract. They ensure a better yield strength and also against shear buckling much liberation shows the effecting coverage of thin composite sections.

Keywords: Composites sections, cold formed sheets, selfcompacting concrete, fire resistance, yield strength

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Influence of curing procedures on compression strength of self-compacting concrete


Self-compacting concrete (SCC) compromises over the normally compacted concrete (NCC) with diverse uses, predominantly the annihilation of vibration and unity in placement. It also confirms to be active in closely arrayed reinforcement bars and in zones where it is incomparably uncertain to compact by using vibrators. SCC is cast by decreasing the ratio of the volume of coarse aggregates to powder content (cementitious materials), thereby improving the volume of paste by adding various viscosity modifying and water reducing admixtures. It is noted that the performance of the design concrete mix is significantly influenced by the difference in moisture and temperature both in the fresh and hardened state. Curing techniques and curing span significantly influence “curing performance”. Procedures used in concrete curing are principally classified into two groups particularly, water adding techniques and waterretraining techniques. In the current research, the influence of few chosen curing methods on the mechanical characteristics of self-compacting concrete (SCC) of grade M30 and M50 have been investigated. In the first stage, numerous investigations are conducted with 0.01m3 of concrete with the application of locally obtainable materials and checked the fresh characteristic analyses according to the standards of European Guidelines and concluded the mix proportion of M30 and M50 grades of SCC, given as a reference SCC mix. In the second stage, the mechanical characteristics including compressive, tensile and flexural strengths affected by several curing methods such as normal water immersion, hot water, ice, seawater and wet covering, will be examined.

Keywords: SCC, admixtures, water-retraining, mechanical characteristics

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An experimental analysis and optimisation of process parameters on friction stir welding of AA 7075-T6 and A384.0-T6 aluminium alloy using response surface methodology


Friction Stir Welding (FSW) is the solid state green welding Technique in which the materials are welded not by melting and recasting. To decide the joint characteristics the major welding parameters of the rotational speed, welding speed and the axial load are taken in to account. In this experimental study the central Composite Circumscribed (CCC) design technique and the mathematical model was developed by using the response surface methodology (RSM). In this experimental analysis 3 major parameters and 5 levels with 20 FSW weld runs are used for the development of the relationship between the FSW parameters of the tool rotational speed, the welding speed and the axial load and the responses of the tensile strength, yield strength, percentage of elongation and the hardness are established.

Keywords: Friction stir welding, welding parameters, mechanical properties, mathematical model, response surface methodology

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Influence of reinforcements and its particle size on the mechanical and tribological behaviour of metal matrix composites – a review


Aluminium based metal matrix composites are used as an unconventional material in the transport, defense, aerospace, automobile, marine applications because of their improved high hardness, stiffness, wear resistance and better temperature resistance. With their combined mechanical and wear characteristics, composites are replacing the conventional materials in the manufacturing industries. Particle reinforced composites have better forming capacity than the fiber or whisker reinforcement. Ceramic materials like SiC and alumina are widely used as reinforcements. Among the different processing techniques, stir casting method seems to be the easier and cost effective. In this paper the effect of reinforcement and its particle size on the mechanical and tribological properties of aluminium matrix composites are reviewed. The results of the researchers indicate that the addition of reinforcement increases the mechanical and tribological properties of the composites. Fine particle reinforcement exhibits superior mechanical properties whereas the coarse particle reinforcement exhibits maximum wear resistance.

Keywords: Metal matrix composites, particle size, stir casting, reinforcement, wear resistance

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Dairy effluent treatment using earth worm bio-technology


Our environment gets polluted day by day by the disposal of large amount of highly polluted effluent generated from the dairy industries without any proper treatment. Environmental engineering concerned with all types of pollution and industrial waste treatment is the core area under the present study. Dairy industry is one of the highly offensive waste generating areas which increases the pollution rate of the total environment. Dairy industry requires 2.5 to 4 litres of water per litre of milk process which comes out as waste water. Various studies revealed that dairy waste water treatment is a complicated one. Dairy waste water contains higher quantity of dissolved or colloidal organic matter and hence higher BOD and COD values. So treatment of dairy waste has great importance and care should be taken before disposing to environment. Conventional treatment technologies were found as not enough to obtain the required quality of the effluent to its discharge standards. Bio-technology treatment is one of the solutions for attaining the effluent standards. This work is one among them, in which the Eisenia fetida earth worms were used for the treatment. Few essential characteristics were analysed to assess the efficiency of the treatment.

Keywords: Bio-technology, dairy, Eisenia fetida earth worm, biochemical oxygen demand, chemical oxygen, efficiency, vermi-filtration

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Effect of reinforcements on micro structure on wear of squeeze cast hybrid (ADC12-SiC-Fly ash) composite


This investigation focuses on the attempt made to prepare ADC12 castings of a non-symmetrical component through squeeze casting process. Samples were produced to study the effect of squeeze pressures (75, 100 and 125 MPa) on microstructure and mechanical properties of the alloy. Results of hardness and tensile tests indicated that squeeze cast specimens exhibited higher mechanical properties than gravity die cast specimens. This was mainly due to applied pressure which resulted in effective filling of the melt into die cavity, microstructural refinement and good heat transfer between the melt and the die. Pressure of 50 MPa was found to be sufficient for pore free castings and pressure of 100 MPa was noted for sound castings. From this study, the squeeze casting process is noted to be suitable for processing this alloy.

Keywords: Squeeze casting; ADC12 aluminium alloy; microstructure; mechanical properties

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Expert system for combustion monitoring in gas turbine engines

Dec 2017 / by K. M. KIRAN BABU and S. SENDHILKUMAR

The fast growing scientific and technological developments in the 21st century is changing the perspective of research towards quality, reliability, and safety with environmental considerations. The efficiency and economy of a process in terms of performance and safety is a primary concern, which can be improved by continuously monitoring the critical performance parameters of the system. The continuous monitoring of performance parameters help in scheduled maintenance which in turn enhances the efficiency and economy of the system and its components. This paper outlines the applications of artificial intelligence and soft computing for the combustion monitoring of the gas turbine engines and proposes an expert system for combustion monitoring (ESCM) in the gas turbine combustor.

Keywords: Combustion, adiabatic flame temperature, condition monitoring

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