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TECHNICAL PAPERS: Microturbines & Small Turbomachinery

Performance Enhancement of Microturbine Engines Topped With Wave Rotors

[+] Author and Article Information
Pezhman Akbari

Department of Mechanical Engineering, Michigan State University, 2500 Engineering Building, East Lansing, MI 48824-1226akbari@egr.msu.edu

Razi Nalim

Department of Mechanical Engineering, Indiana University–Purdue University Indianapolis (IUPUI), Indianapolis, IN 46202-5132mnalim@iupui.edu

Norbert Müller

Department of Mechanical Engineering, Michigan State University, 2455 Engineering Building, East Lansing, MI 48824-1226Mueller@egr.msu.edu

The wave rotor compression efficiency is greater than the compressor efficiency. Therefore, the combustor inlet temperature is in fact negligibly smaller and hence the heat addition is negligibly greater than that in the baseline engine.

J. Eng. Gas Turbines Power 128(1), 190-202 (Dec 13, 2004) (13 pages) doi:10.1115/1.1924484 History: Received March 12, 2004; Revised December 13, 2004

Significant performance enhancement of microturbines is predicted by implementing various wave-rotor-topping cycles. Five different advantageous cases are considered for implementation of a four-port wave rotor into two given baseline engines. In these thermodynamic analyses, the compressor and turbine pressure ratios and the turbine inlet temperatures are varied, according to the anticipated design objectives of the cases. Advantages and disadvantages are discussed. Comparison between the theoretic performance of wave-rotor-topped and baseline engines shows a performance enhancement up to 34%. General design maps are generated for the small gas turbines, showing the design space and optima for baseline and topped engines. Also, the impact of ambient temperature on the performance of both baseline and topped engines is investigated. It is shown that the wave-rotor-topped engines are less prone to performance degradation under hot-weather conditions than the baseline engines.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic configuration of a typical wave rotor

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Figure 2

Schematic of a gas turbine topped by a four-port wave rotor

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Figure 3

Schematic example of the physical implementation of a wave rotor in a gas turbine (exploded view, piping not shown)

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Figure 4

Schematic T-s diagrams for a gas turbine baseline engine and the most common implementation case of a topping wave rotor

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Figure 5

Schematic T-s diagrams for a baseline cycle and five different wave-rotor-topped cycles

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Figure 13

Schematic T-s diagram for a recuperated baseline cycle and two wave-rotor-topped cycles

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Figure 12

Schematic of a recuperated gas turbine topped by a four-port wave rotor

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Figure 11

Effect of ambient temperature-overall thermal efficiency, specific work, and specific fuel consumption versus wave rotor pressure ratio and overall pressure ratio for Case B

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Figure 10

Effect of ambient temperature-overall thermal efficiency, specific work, and specific fuel consumption versus wave rotor pressure ratio and overall pressure ratio for Case A

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Figure 9

Performance map for wave-rotor-topping of gas turbines, Cases C and E

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Figure 8

Performance map for wave-rotor-topping of gas turbines, Cases A, B, and D

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Figure 7

Relative values of thermal efficiency, specific work, and SFC for the wave-rotor-topped engines versus the wave rotor pressure ratio and overall pressure ratio, Case A consideration

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Figure 6

Thermal efficiency, specific work, and SFC for the wave-rotor-topped engines versus the wave rotor pressure ratio and overall pressure ratio, Case A consideration

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