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Regenerative Brayton Cycle Analysis

In:

Submitted By sunamisurfer2001
Words 7206
Pages 29
MAE 336
(Power Plant Design)

Design Project 1:
Regenerative Brayton Cycle

Date Submitted: 4/02/2012

Garrett Kinsel
ID#: 003800821

Mon/Wed 9:00am-11:15am

Instructor: Dr. Torabzadeh, Ph.D.

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ABSTRACT

The purpose of this design project was to investigate the effect of various design and operating parameters on the thermal efficiency, net work output per unit mass, and back work ratio of a regenerative Brayton cycle. Specifically, these parameters include the pressure ratio, TminTmax ratio, regenerator effectiveness, and compressor and turbine efficiencies, assuming the working fluid to be air at 100kPa and 300K at the compressor inlet. Model calculations are presented for all combinations of the following parameters:

Pressure Ratio: 5, 10, 15, 20
Maximum cycle temperature: 1500 K, 2000 K, 2500 K, 3000 K * TminTmax ratio = 0.2 (@1500K), 0.15 (@2000K), 0.12 (@2500K), 0.1 (@3000K)
Compressor adiabatic efficiency: 75%, 85%, 100%
Turbine adiabatic efficiency: 75%, 85%, 100%
Regenerator effectiveness: 75%, 85%, 100%

These results are utilized to construct graphical representations for comparison in pursuit of determining the best process for a given set of design constraints. The net work output and thermal efficiency are found to be increasing with regenerative effectiveness, and the compressor and turbine efficiencies. The cycle efficiency generally decreased with an increasing pressure ratio.

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BACKGROUND THEORY

The man who created the Brayton cycle to be used in reciprocating oil-burning engines was George Brayton. The Brayton cycle is used today for gas turbines in which both the compression and the expansion processes take place in the rotating machinery. The first successful gas turbine was introduced around the 1930’s

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