Ranjan Saha

PhD Student
Telefon: 08 790 7477
E-post: ranjan.saha@energy.kth.se
Besöksadress: Brinellvägen 68

Research

PhD Candidate at the Heat and Power Division (EKV) of the Energy Technology Department (EGI) at KTH, Stockholm.

Research Field: Aerodynamics/Fluid mechanics in turbomachinery.

Of the various means of producing mechanical power the thermal turbomachine is in many respects still the best adapted prime mover. With the desire of increased power output and higher efficiency, gas turbine engines face the challenge of continuously increasing turbine inlet temperature. The first stage vane now experiences a temperature higher than its melting point. Secondary flows are generally considered detrimental to the performance and reliability of gas turbines. This is due to the fact that the secondary flow extracts its energy from the main stream flow and so it loses energy. Furthermore, the secondary flow entrains the higher temperature gas from the main stream flow to the airfoil and endwall and thereby can increase the surface heat transfer.  These potentially adverse effects are more pronounced in low aspect-ratio high pressure stages. The overall goal is to identify design concepts that have environmental, technical and economical potentials for performance improvements regarding the first high-pressure turbine stage.

Teaching

Course assistant for Sustainable Power Generation (SPG), Renewable Energy Technology (RET), Renewable Energy Technology, Advance course.

Curriculum Vitae

2009 MSc in Sustainable Energy Engineering.
Royal Institute of Technology, KTH Stockholm, Sweden.

2007 BSc in Mechanical Engineering.
Bangladesh University of Engineering and Technology (BUET), Bangladesh.

Publications

Saha, R., Mamaev, B., Fridh, J., Annerfeldt, M. and Fransson, T.; 2012, “Experimental Studies of Leading Edge Contouring Influence on Secondary Losses in Transonic Turbines”, ASME Turbo Expo, GT2012-68497

El-Gabry, L., Saha, R., Fridh, J. and Fransson, T.; 2012, “Measurements of Hub Flow Interaction on Film Cooled Nozzle Guide Vane in Transonic Annular Cascade”, ASME Turbo Expo, GT2012-68088

Mamaev, I. B., Saha, R. and Fridh, J.; 2013, “The influence of a special fillet between the endwall and airfoil at the leading edge on the performance of the turbine nozzle diaphragm”, Thermal Engineering, Vol. 60, No. 3, pp. 217-222, Original Russian Text Copyright by Teploenergetika