Development Of Optimized Vehicle Body Of The Ethiopian Train Under Crosswind Conditions For Energy Efficiency And Dynamic Stability

Abstract

Nowadays, Railway Transport Is Widely Used And Improving Its Technology Day By Day In Many Countries In The World. Thus, This Transportation System Brings Enormous Benefits To Society And Economical By Easily Providing Access And Mobility Of Mainly Passenger And Freight Transport. Ethiopian Government Has Planned Ongoing Construction Of Standard Gauge Electrified Railway System Which Is Covering More Than 5000km Regional And Intercity Integration. Three Types Of Ethiopian Trains Are Regional Passengers, Freight And Light Railway Transit Public Transport Train Have Poor Aerodynamic Shape Related Their Speed. This Study Has Been Focused On Development Of Optimized Vehicle Body Of The Ethiopian Train Under 12 M/S Cross-Winds Speed Condition For Energy Efficiency And Dynamic Stability Of Regional Train Locomotives And Light Railway Transit Train. For Numerical Simulation Analysis This Study Has Used Phoenics Software A Tool Of Cfd Approaching Method, Kechen Standard Turbulence Model And Grid Optimization Test. In Developing Of Train For Power Saving And Guarantee Driving Stability Of Train Locomotives At Their Cruise Speed At Highspeed Under The Influence Of Cross-Wind, Reduction Of Aerodynamic Force Coefficients And Center Of Pressure Position With Respect To Center Of Gravity Were Major Areas. Which Is Depend On The Modification Of Train Locomotive Body Shape. Particularly, From A Simple Aerodynamic Body Modification Of Front, Top And Side Parts Have Significant Of Power Reduction Of 23.013%, 17.397% And 7.365% For Regional Passenger Train Locomotive At Maximum Operation Speed Of 160km/H , Freight Train Locomotive At Maximum Operation Speed Of 120km/H And Light Railway Transit Public Transport Train At Maximum Operation Speed Of 80km/H Respectively. But This Paper Has Excluded Headwind Effect And Considered Only Pressure Drag Resistance. This Work Found That The Judgment Of Stability Of Ethiopian Regional Train Locomotives And Light Railway Transit Train On Straight Rail Track Aerodynamic Stability The Rotational Moment Values Have Less Than Resistance Moment Values For All Six Tested Model Cases And On Curved Rail Track Dynamic Stability Of Regional Train Locomotives Maximum Limited Speed Of 20m/S And Light Railway Transit Train Maximum Limited Speed Of 12m/S Under Cross-Wind Condition. Therefore, From These Aerodynamic Drag Improvement Energy Efficiency And Aerodynamic Stability Has A High Impact On The Reduction Of Annual Energy Consumption And The Stability Of Ethiopian Train Locomotives Safety Has Guaranteed At Their Maximum Operational Speeds.