Instructional Design Document Brayton Cycle STAM Interactive Solutions

Demo Outline (For reference) ‏ Interactive pageEfficiency3 Animated pageActual Brayton Cycle2 Animated pageIdeal Brayton Cycle1 Page TypeTopic NameTopic Number

The question statement on Slide 11 is reworded. Quiz Question 2 Reword to show difference between Open (i.e. Gas Turbine) and Closed Brayton Cycles 5 Slide 8 Please refer to the guidelines in the Notes section. Interactivity Use efficiency-meter as in Carnot Fix T3 since material-limitations prevent higher-temperatures Allow user to drag point 2 up and down 4 Slide 6 Guidelines in the notes section have been modified. Please refer to sentence 3. Ensure graph lengths are realistic |T3-T4| > |T2-T1| 3 Slide 6On the figure, use WNET instead of WOUT 2 Slides 5 & 6. Guidelines in the notes section have been modified for the isobars to like those on slide 7. Isobars should avoid showing a vertical region, roughly follow form of e (x+c) ‏ 1 Changes reflected on slide no.Changes Suggested by Prof. Gaitonde Change Log

PLEASE READ Global Note: Please change the isobars on all the graphs as given in the excel sheet ‘IsobarsForBraytonCycle.xls’ For all the graphs: 1.Show a pipe like structure with temperature variations in terms of colors with red & blue gradients. For working models: 2.Use consistent block designs for Compressors, Turbines, Combustion Chambers/Boilers, Regenerators, Intercoolers and Reheaters. 3.Show the arrow entering the compressor pointing to the compressors left bottom corner. 4.Show the arrow exiting the compressor pointing to the compressors right top corner. 5.Show the arrow entering the turbine pointing to the turbines left top corner. 1.Show the arrow exiting the turbine pointing to the turbines right bottom corner. 2.If there are no arrows indicated on the reference image please insert arrows according to the numbers indicated on it. While showing both graphs & working models: 1.Show a particle movement in the working model syncd with arrow movement in the pipe like structure of the graph. 2.While showing Efficiency, show the useful work (area enclosed between the upper & lower curve) & unused work (area enclosed between lower curve & the x-axis) with different colors.

Brayton Cycle Applied Thermodynamics Originally designed for piston-engines, the air- standard Brayton Cycle is the ideal cycle for simple gas turbine that is widely in used today.

Brayton Cycle Applied Thermodynamics Ideal Brayton Cycle Isentropic Process Isobaric Process Isentropic Process Isobaric Process

Brayton Cycle Applied Thermodynamics Actual Brayton Cycle 1-2s-3s-4s = Ideal Brayton Cycle 1-2a-3a-4a = Actual Brayton Cycle

Brayton Cycle Applied Thermodynamics Efficiency Efficiency Meter Vary T1 and observe the efficiency Reference image

Brayton Cycle Applied Thermodynamics Resources Books: 1.G.J.Van Wylen's, "Thermodynamics“. Reference Links:

Brayton Cycle Applied Thermodynamics A Brayton Cycle's working fluid must always be air can be either a vapor or a pure gas must always be a gas must always be a liquid

Brayton Cycle Applied Thermodynamics A closed Brayton cycle differs from an open Brayton cycle because isentropic processes are possible in the former but not in the latter adiabatic processes are possible in the latter but not in the former the latter uses an internal combustion process while the former uses heat transfer processes

Brayton Cycle Applied Thermodynamics The Brayton Cycle is more efficient than a Rankine Cycle because the working fluid is the same less efficient than a Rankine Cycle because the working fluid is the same less efficient than a Rankine Cycle because the working fluid is a gas more efficient than a Rankine Cycle because the working fluid is a gas

Brayton Cycle Applied Thermodynamics In an open Brayton cycle the combustion chamber is replaced by a heat exchanger gas exits from turbine to a heat exchanger the exhaust gases leave the turbine the compressor takes in fresh air

Brayton Cycle Applied Thermodynamics In a gas turbine the temperature of the gas entering the turbine is limited by metallurgical considerations properties of the gas Carnot cycle efficiency