Mechanical Engineering

Friction stir welding is a relatively new solid-state joining technique which is widely adopted in different industry fields to join different metallic alloys that are hard to weld by conventional Fusion welding. FSW welding of material ( like aluminium stainless steel copper etc.) with good weld quality it is essential to manufacture specified fixture having accurate clamping capacity, heat resistance, compressive strength of base plate, flexibility in the welded plate dimension and easy to operate before and after FSW process. In this paper everything is calculated properly with complete design criteria to fulfill above mentions requirement

The actual move bottom associated with rotor techniques, corresponding because helicopters, wind generators as well as propellers, includes a vortex multiply which is created by the pickup disbursement down the blades. Due to the co-action involving the vortex variables a new roll-up system adapts throughout instantly following vortex multiply is actually created, which often builds up corporation tip in addition to main vortices within the adjoining near-wake bottom your rotor. The actual roll-up system is actually centrally manipulated by the co-action legislations associated with Biot Savrt. In exceptional situations, your tip/root vortex system is actually alterable, in addition to oncoming in order to different lack of stability approaches the item by the way crumbles decrease in addition to commences small-scale disturbance in addition to downstream. The actual wake up can certainly normally possibly be alienated directly into 2 asymmetric areas, close to wake up in addition to a lot wake up. Near-wake variables tend to be accompanied on the starting up on the vortex system the spot that the living on the rotor is actually detected expressively throughout the putting your unit together on the vortex system. The actual a lot wake up is often your downstream route the spot that the wake up design no longer depends on distinct rotor capabilities as well as the spot that the move offers discontinued decrease and is particularly manipulated through small-scale disturbance. The actual start skepticism, while, are actually the best way to examine your relationship concerning near-wake design in addition to far-wake conduct. The actual design on the wake up offers used approaches with the aerodynamic conduct associated with helicopters (Bolnot 2010) in addition to wind generators (Vermeer, Sorensen & Crespo 2008) as well as pertaining to deliver propellers (Breslin & Andersen 1996).

Any process involving the process of increasing the efficiency of any mechanical part is a vital concept in the field of engineering and technology and equally vital in the field of energy and power systems too. This paper is based on a technique that could be used to improvise and increase the efficiency of the gas turbine aviation engines which was theoretically stated after conducting series of experiments and analysis through software. This technique could be called as REPOLARIZED MAGNETIC ROTATION technique which converts the magnetic power to mechanical power which could therefore be used to compress air in compressor, and thereby increase the efficiency of the gas turbine engines used in aviation. Various techniques adapted to design, analyze and fabricate the test engine were stated in this paper.

The gas solid hydrodynamic studies of a Flat plate, Conical and partitioned concave distributor is reported. The study included hydrodynamic characteristics and moving pattern of particles in the bed. One of the objective of the present work is to investigate the influence of distributor types on the performance of fluidized bed reactors using group B particles as per Geldart D,.1972. Classification Gas - solid hydrodynamic characteristics viz ; Bubble diameter Froude no , Bubble rise velocity of partitioned concave distributor are compared with the conical and flat plate distributors commonly used. The bed void age is used as the parameter for indicating the fluidization quality in selecting the final configuration of the distributor. The bed void age arrived for partitioned concave distributor are compared with the conical and flat plate distributors and results presented.

The present research paper examines the factors which a company must consider while implementing Green Supply Chain Management (GSCM) practices. Three companies from Indian “Food and Beverage” (F&B) sector are examined in their approach to be more sustainable. The research method employed is comparative case study analysis. Semi-structured interviews are held with two relevant managers from each company. Top-management support is crucial for effectively working GSCM practices. Employee involvement is recognized as crucial element of GSCM. An environmental friendly company culture is beneficial and should be derived from the companies’ environmental vision and mission. Collaborations with suppliers are perceived to be productive and essential to develop innovative products.

The present paper discusses the development of a Markov model for performance evaluation of water circulation system of a thermal power plant using probabilistic approach. A water circulation system ensures a proper supply of water for smooth working of a thermal power plant. For regular and economical generation of steam, it is necessary to maintain each sub- system of this system to ensure an optimum level of availability. In present paper, the water circulation system consists of five subsystems with three possible states i.e. working, reduced and failed state. Failure and repair rates of subsystems are taken to be constant. After drawing transition diagram, differential equations have been generated. After that, steady state probabilities are determined. The system of equations is solved for steady state availability of the system using Laplace transformation technique. Besides, some decision matrices are also developed, which provide various performance levels for different combinations of failure and repair rates of all subsystems. Based upon various performance values obtained in decision matrices and plots of failure rates/ repair rates of various subsystems, performance of each subsystem is analysed and then maintenance decisions are made for all subsystems. The developed model helps in comparative evaluation of alternative maintenance strategies.

Higher quality and cost effective welds can be achieved by understanding the weld metal properties and influence of welding parameters. Submerged arc welding is preferred process for the higher productivity and better finishing of deposited metal. Welding input parameters have significant role in determining the quality of a weld joint. The joint quality can be assessed in terms of weld bead geometry and weld metal properties. Investigation has been made on influence of welding input parameters on weld bead geometry and metallurgical properties.

In modern engine design, to reach a more compact and optimized cooling system, exploiting nucleate boiling in thermally critical regions is required. Several studies have attempted to enhance the nucleate boiling heat transfer. This paper reviews the most important issues (i.e. surface roughness, composition of the liquid, electric field, vibration, orientation of the heated surface, surfactant addition, pressure and velocity) and their effects on nucleate boiling heat transfer.

The objective is to determine blend which gives less emission and good performance characteristics, comparing emissions and performance characteristics between blends and pure gasoline fuel at different speeds, different compression ratios and different loads and carry out the test on VCR engine at full throttle valve opening without modification and without knocking at, different gasoline-ethanol blends (E5,E10,E15) and pure gasoline, different compression ratios (8,9,10) and different speeds (1600,1700,1800 in rpm) where, performance characteristics are volumetric efficiency, brake power, brake thermal efficiency and emissions of CO, CO2, HC.

In this paper, numerical performance analysis of jet compressor’s has been carried out using irreversibility characteristics. The various losses that occur in different regions of jet compressor have been quantified and an attempt has been made to increase the efficiency of jet compressor by reducing the losses based on minimization of entropy method. In the present work, new technique has been identified to minimise the momentum difference between the motive and the propelled fluid. This was carried out by forcing the propelled stream using a blower. The geometrical design parameters were obtained by solving the set of governing equations, a CFD package; FLUENT and it has been effectively used to evaluate the optimum entrainment ratio for a given set of operating conditions.