Theoretical Analysis of Gas Turbine Blades by Finite Element Method

Gas turbine is an important functional part of many applications. Cooling of blades has been a major concern since they are in a high temperature environment. Various techniques have been proposed for the cooling of blades and one such technique is to have axial holes along the blade span. Finite element analysis is used to analyze thermal and structural performance due to the loading condition, with material properties of Titanium- Aluminum Alloy. Six different models with different number of holes (7, 8, 9, 10, 11, 12) where analyzed in this paper to find out the optimum number of holes for good performance. In Finite element analysis, first thermal analysis followed by structural analysis is carried out. Graphs plotted for temperature distribution for existing design (12 holes) and for 8 holes against time. 2D and 3D model of the blade with cooling passages are shown. Using ANSYS, bending stress, deflection, temperature distribution for number of holes are analyzed. Results have been discussed and we found that when the numbers of holes are increased in the blade, the temperature distribution falls down. For the blade configuration with 8 holes, the temperature near to the required value i.e., 800oC is obtained. Thus a turbine blade with 8 holes configuration is found to be the optimum solution.Keywords: Gas turbine blade; Stress; Deflection; Temperature distributionDOI: http://dx.doi.org/10.3126/jie.v8i1-2.5092Journal of the Institute of Engineering Vol. 8, No. 1&amp;2, 2010/2011Page : 1-11Uploaded Date: 19 July, 2011</jats:p

Parametric Influence of Friction Stir Welding on Cast Al6061/20%SiC/2%MoS&lt;sub&gt;2&lt;/sub&gt; MMC Mechanical Properties

In this work, effect of tool speed and direction of tool rotation of friction stir welding (FSW) process on the cast MMC is analyzed. Aluminum 6061 alloy reinforced with 20% silicon carbide particles added with 2% molybdenum disulphate is prepared by die casting process. Macro and micro-structural analysis is performed to study the size and shape of the constituents, to discover the defects associated with stir welding and quality of weld. Micro-hardness observations are carried out on the parent metal, FSW zone and heat affected zone. It is observed that FSW with high speeds develops higher hardness and most of the higher hardness value occurs in in the order of FSW welding zone, center zone and heat affected zone, and also hardness value of clockwise tool rotation is greater than anti-clockwise tool rotation.</jats:p