Configuration of Optimal Cross Bore Shape in Elastic Pressurized High Pressure Vessels
Journal Title: International Journal of Mechanical and Production Engineering Research and Development (IJMPERD ) - Year 2019, Vol 9, Issue 5
Abstract
Numerous analyses were performed to establish the optimal shape between circular and elliptical plain cross bore at both radial and offset positions in closed thick walled cylinders. Seven cross bored cylinders with thickness ratios between 1.4 and 3.0 were studied. For effective comparison between circular and elliptical cross bores, the major radius of the elliptical cross bore was equal to that of circular cross bore. The behaviour of hoop stresses together with that of Stress Concentration Factors (SCF) were investigated at offset location ratios ranging from 0 to 0.9 using a three dimensional linear finite element analysis. Elliptical shaped cross bore predicted lower hoop stresses at radial position than circular ones, with a variation of 44.6% to 66.9% across the studied thickness ratios. With exception of K= 2.25, circular cross bores predicted lower hoops tress at 0.9 offset location ratio than elliptical ones. The minimum SCF magnitude due to circular cross bore occurred at 0.9 offset position in K=1.4, with a magnitude of 2.312. On the other hand, the lowest SCF magnitude produced by elliptical cross bore occurred at radial position with magnitude of 1.733 at thickness ratio of 2.5. This magnitude predicted by the elliptical cross bore also doubled as the overall optimum SCF in this study. For a circular cross bore, coincidence in SCF between the optimum thickness and location occurred in K=1.4 at the 0.9 offset position which also gave the best circular shape. Whereas for an elliptical shape, similar coincidence in SCF occurred respectively in K=1.75 and 2.5 at 0.685 and 0 offset positions. In conclusion, optimal location of elliptical cross bores reduce SCF magnitudes by 33% in comparison to a similar circular cross bore. However, an incorrect positioning of the same cross bore may lead to a rise of SCF magnitude by 121%.
Authors and Affiliations
P. K. Nziu, L. M Masu
Keywords
Related Articles
- EP ID EP671645
- DOI 10.24247/ijmperdoct201918
- Views 102
- Downloads 0
Experimental Analysis of a Solar Flat Plate Collector for Enhancement in Thermal Performance using Solar Turbulence Generators
Solar air heaters are now-a-days used in space heating as well as a process heating in domestic applications. Since it is a renewable energy conversion device, enhancement of such devices assumes greater significance due...
Manufacturing of Proto Type Wind Turbine Blades Using Rapid Prototype Technology
All over the world, the wind energy has numerous benefits in helping to provide a source of clean and renewable electricity. For greater use of wind energy, the research efforts are aimed at addressing the challenge. The...
Evaluating the Performance and Emission Characteristics of CI Engine with Waste Plastic Oil
The continuous increase of demand for energy, diminution of oil recourses and stringent pollution norms encourage the researchers to find alternate fuels. Waste converted to fuel, a technique to get alternate fuels is an...
Optimization of PID Controller Gains of an Aircraft Pitch Control System Using Particle Swarm Optimization Algorithm
In this paper, a “Proportional-Integral-Derivative” (PID) controller used in a aircraft pitch control system is optimally tuned to control the output response so as to obtain a much more stable and optimized transient re...
A High Step-UP DC/DC Converter for Marine Applications
In this paper, a voltage-doubler circuit with high step-up dc-dc converter has been proposed. This proposed converter minimises low voltage stress on the MOSFET switches and high voltage gain with suitable duty ratio and...