SPECIAL TOPICS IN THERMAL TURBOMACHINES

General Info

• Course Title: Special Topics In Thermal Turbomachines
• Course Code: NAOME1368
• Semester: 9th
• Course Type: S.¹
• Weekly Teaching Hours: 3 (Lectures)
• Credits (ECTS): 4
• Offered to ERASMUS+ students: Yes
• Course Website: https://eclass.uniwa.gr/courses/ET173/
• Professors: D. Koubogiannis

Course Content / Syllabus

Lectures:
Definition, classification and main applications of thermal turbomachines, thermodynamic analysis of compressors and turbines, stagnation state, isentropic and polytropic efficiency. Gas turbines, classification, ideal Joule-Brayton cycle, complex cycles (regeneration, compression in two stages with intercooling, expansion in two stages with reheat), solution of real cycles, calculation of performance measures, combustion chambers, turbine blade cooling, reference to cogeneration and trigeneration plants. Turbomachinery fluid mechanics, elements of blade theory, absolute and relative velocity, velocity triangles, Euler equation, one-dimensional aero-thermodynamic analysis of compressor and turbine stage (of either gas or steam turbine). Elements of one-dimensional compressible flow in ducts, sound velocity, Mach number, compressibility phenomena, isentropic flow, shock waves, flow in a duct with non- constant area, diffuser, nozzle, adiabatic and non-isothermal gas flow in a duct, mass flow rate calculation through an opening, mass chocking and application in turbines. Axial compressors, design parameters (mass flow rate coefficient, loading coefficient, degree of reaction), operational diagram of a compressor, centrifugal compressor, rotating stall, surge, axial turbines, radial turbines, operational diagram of a turbine. Compressor-turbine matching in gas-turbines and turbochargers, design and off-design operation, special viscous flow topics in turbomachines, total pressure loss models, simulation approaches, design and manufacturing topics, rotating shaft structural and vibration issues, reference to diagnostics.

Course Outline