# Introduction to Turbomachinery

By Prof. Subrata Sarkar   |   IIT Kanpur
Learners enrolled: 1322
The objective of the course is to provide a framework to discuss different kinds of turbomachinery through a unified approach. The material presented is intended for undergraduate and graduate students apart from professional engineers in the industry engaged in the analysis and development of turbomachinery. Coverage begins with the fundamental concepts, the equations of motion in a rotating system, and the Euler equation for turbomachinery. This is followed by the gas turbine cycle, similarity rules, and cascade flow analysis. The reader is then focused on flows through compressors and turbines, including a brief discussion on the secondary flow, tip clearance, blade cooling, surge, and stall. The course will be concluded with a discussion on CFD in the design and analysis of turbomachinery.

INTENDED AUDIENCE :UG/PG students, research scholars, and practicing engineers interested in the field of turbomachinery.
PRE-REQUISITES   : Basic Thermodynamics and Fluid Mechanics
INDUSTRY SUPPORT : HAL/GTRE/NTPC/NHPC/BHEL/GE India etc.
Summary
 Course Status : Completed Course Type : Core Duration : 12 weeks Start Date : 26 Jul 2021 End Date : 15 Oct 2021 Exam Date : 24 Oct 2021 IST Enrollment Ends : 09 Aug 2021 Category : Aerospace Engineering Mechanical Engineering Civil Engineering Credit Points : 3 Level : Undergraduate/Postgraduate

### Course layout

1. Introduction and Classification: Axial flow, radial flow and mixed flow machines, the equations of motion in rotating frame of reference, effects of Coriolis and Centrifugal forces, momentum and energy equation, Euler work, and illustrative examples.[5]
2. Gas Turbine Cycle: Brayton Cycle, regenerative cycle, reheat, inter-cooling, turboprop, turbojet and turbofan engine, thrust augmentation, and illustrative examples.   [4]
3. Similarity Analysis: Similarity rules, specific speed, Cordier diagram and illustrative examples.[4]
5. Axial Flow Compressor: Two-dimensional pitch line design and analysis, h-s diagram, degree of reaction, the effect of Mach number, performance and efficiency, three-dimensional flow, tip clearance, losses, compressor performance, and illustrative examples. [6]
6. Centrifugal Pump and Compressor: Theoretical analysis and design, the effect of circulation and Coriolis forces, reversal eddies, slip factor, head and efficiency, diffuser, introduction to the combustion system, and illustrative examples.[6]
7. Axial Flow Turbine: Two-dimensional pitch line design, stage loading capacity, degree of reaction, stage efficiency, turbine performance, blade cooling, and illustrative examples.[6]
8. CFD Applied to Turbomachinery Flows: Governing equations, numerical methods, and test cases illustrating flow and heat transfer related to turbomachines.

Total Class: 36   (It equivalent to 12 weeks considering 3 classes per week)

### Books and references

Fluid Mechanics and Thermodynamics of Turbomachinery, S. L. Dixon and C. A. Hall, Butterworth-Heinemann, Seventh Edition, 2014. Gas Turbine Theory, H. Cohen, GFC Rogers and HIH Saravanamuttoo, Addison Wesley Longman Limited, 4th Edition, 1996.

### Prof. Subrata Sarkar

IIT Kanpur
Prof. S. Sarkar, Professor of the Department of Mechanical Engineering at the Indian Institute of Technology Kanpur, India, HAL Chair, Convener of Energy Conversion and Computational Turbomachinery Laboratories, received Ph.D. in 1995. He also severed the University of Surrey, UK for two years. Dr. Sarkar is involved in research over the last 25 years and contributed significantly to the fields of Fluid Mechanics, Turbulence, Turbomachinery, CFD, and Large-Eddy Simulation. He is the author of several peer-reviewed technical papers in international journals and conferences, and has guided a number of masters and doctoral students. He has completed many industrial and sponsored projects. He has served as a technical expert on project-review committees of national importance, and also served on numerous academic and administrative committees of the Institute.

### Course certificate

The course is free to enroll and learn from. But if you want a certificate, you have to register and write the proctored exam conducted by us in person at any of the designated exam centres.
The exam is optional for a fee of Rs 1000/- (Rupees one thousand only).
Date and Time of Exams: 24 October 2021 Morning session 9am to 12 noon; Afternoon Session 2pm to 5pm.
Registration url: Announcements will be made when the registration form is open for registrations.
The online registration form has to be filled and the certification exam fee needs to be paid. More details will be made available when the exam registration form is published. If there are any changes, it will be mentioned then.
Please check the form for more details on the cities where the exams will be held, the conditions you agree to when you fill the form etc.

CRITERIA TO GET A CERTIFICATE

Average assignment score = 25% of average of best 8 assignments out of the total 12 assignments given in the course.
Exam score = 75% of the proctored certification exam score out of 100

Final score = Average assignment score + Exam score

YOU WILL BE ELIGIBLE FOR A CERTIFICATE ONLY IF AVERAGE ASSIGNMENT SCORE >=10/25 AND EXAM SCORE >= 30/75. If one of the 2 criteria is not met, you will not get the certificate even if the Final score >= 40/100.

Certificate will have your name, photograph and the score in the final exam with the breakup.It will have the logos of NPTEL and IIT Kanpur .It will be e-verifiable at nptel.ac.in/noc.

Only the e-certificate will be made available. Hard copies will not be dispatched.

Once again, thanks for your interest in our online courses and certification. Happy learning.

- NPTEL team