• Hidroenergetika, Semester 3, position 2

Theory and practical skills about hydraulic power transmission, with focus on hydrodynamic power transmission. Selection and application of hydraulic transmission.

Upon successful completion of this course, students should be able to: 1. identify and describe the various types and constructions of the hydraulic power transmission systems (hydraulic torque converter, hydraulic coupling and brake), and the principles of their work, 2. select the appropriate hydraulic power transmission system, 3. examine the hydraulic power transmission system according to the valid international standard.

Classification of the power transmitters. Classification of the devices for hydraulic power transmission. Development of the hydrodynamic power transmitters. Classification of the hydrodynamic power transmitters according to the standard VDI 2153. Working principles. Main elements and calculation. Hydrodynamic converter, coupling and break (retarder). Applications. Characteristic lines of coupling and converter. Similarity laws. Schematic symbols. Operating parameters, ratio of conversion, torques. Torque characteristics, adjustability, energy efficient exploitation. Hydrodynamic calculation of the coupling. Main relations in pump and turbine impellers. Operating process in the converter. Moments, velocity triangles and energy balance. Flow rate dependence of the working regime. Torque dependence of the conversion ratio. Main geometry parameters calculation. Exploitation features of the converters. Starting regime. Motor coupling. Joint converter and motor operation. Regulation of the coupling and converter. Selection of operating fluids. Hydrodynamic transmitters tests.

Project: Pump impeller. Exercises: Calculation of the main dimensions of the hydrodynamic converter after the similarity law. Flow parameters calculation on the medium circle in pulling regime of the hydrodynamic converter. Blade sketches of the pump and turbine impellers and guide vanes. Schematic presentation of the hydrodynamic converter. Joint operating mode of the hydrodynamic converter and motor. Characteristics calculation. Seminary work: Presentation of the work on the task topic.

Compulsory: Fluid Mechanics B. Preferable: Fluid Mechanics M, Basics of turbomachinery, Pumps, Hydraulic turbines.

Literature listed in references, lectures in hard copy and electronic form, exercises in hard copy.

Total assigned hours: 75

New material: 20
Elaboration and examples (recapitulation): 10

Auditory exercises: 13
Laboratory exercises: 1
Calculation tasks: 2
Seminar paper: 7
Project: 5
Consultations: 0
Discussion/workshop: 2
Research study work: 0

Review and grading of calculation tasks: 2
Review and grading of lab reports: 0
Review and grading of seminar papers: 2
Review and grading of the project: 4
Test: 2
Test: 0
Final exam: 5

Activity during lectures: 10
Test/test: 10
Laboratory practice: 0
Calculation tasks: 10
Seminar paper: 10
Project: 30
Final exam: 30
Requirement for taking the exam (required number of points): 30

VDI стандард: VDI 2153 - Hydrodynamic power transmission (Definitions - Design - Mode of Action), 1994.; Naunheimer H., Bertsche B., Lechner G. (2007): Fahrzeuggetriebe, Grundlagen, Auswahl, Auslegung und Konstruktion, 2. издање, Springer.; Krsmanović Lj., Gajić A. (1998): Turbomachinery - Hydrodynamic power transmitters, Faculty of Mechanical Engineering, Belgrade. (in Serbian); Bogdanović B., Nikodijević D., Vulić A. (1998): Hydraulic and hydromechanical power transmitters, Faculty of Mechanical Engineering, Niš. (in Serbian); Kelić V. N. (1989): Hydrotransmitters, 2nd edition, Naučna knjiga, Belgrade. (in Serbian)