Thermodynamic analysis of gas turbines topped with wave rotors

Fatsis, A.; Ribaud, Yves

doi:10.1016/s1270-9638(00)86965-5

Cited by 42 publications

(19 citation statements)

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“…Consequently, more work can be produced from the turbine in the cycle topped with the wave rotor, increasing engine thermal efficiency and output power. This outcome has been demonstrated both theoretically [28][29][30] and experimentally [23,31]. However, the complex ducting to and from the combustor and additional weight may be seen as drawbacks to this approach [32,33].…”

Section: A Pressure-exchange Wave Rotor: Basic Machinementioning

confidence: 79%

Review of Recent Developments in Wave Rotor Combustion Technology

Akbari

Nalim

2009

Journal of Propulsion and Power

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For some decades, efforts have been made to exploit nonsteady combustion and gas dynamic phenomenon. The theoretical potential of nonsteady-flow machines has led to the investigation of various oscillatory flow devices such as pulse detonation engines, wave rotors, pulse jets, and nonsteady ejectors. This paper aims to provide a progress review of past and current research in developing a particular combustion concept: the wave rotor combustor. This pressure-gain combustor appears to have considerable potential to enhance the performance and operating characteristics of gas turbine and jet engines. After attempts in the mid-twentieth century were thwarted by mechanical problems and technical challenges identified herein, recent successes in Switzerland and efforts in the United States benefited from design expertise developed with pressure-exchange wave rotors. The history, potential benefits, past setbacks, and existing challenges and obstacles in developing these nonsteady combustors are reviewed. This review focuses on recent efforts that seek to improve the performance and costs of future propulsion and powergeneration systems.

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Section: A Pressure-exchange Wave Rotor: Basic Machinementioning

confidence: 79%

Review of Recent Developments in Wave Rotor Combustion Technology

Akbari

Nalim

2009

Journal of Propulsion and Power

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“…They have used a detailed map of the wave rotor cycle performance accomplished by Wilson and Paxson. [16][17][18] After numerical modeling 26,27 in 1999, Fatsis and Ribaud from the French National Aerospace Research Establishment (ONERA) have performed 28 a basic investigation of the thermodynamic performance enhancement for various types of gas turbines topped with wave rotors, including auxiliary power units, turboshaft, turbojet, turbofan engines. The variation of wave-rotor compression and expansion efficiency, as well as mixing and pressure losses in the ducting, have been taken into account.…”

Section: History Of Wave Rotorsmentioning

confidence: 99%

“…Considering the same "aerodynamic quality" of the wheels, the polytropic efficiencies of the compressor and turbine are kept the same for both enhanced and baseline engines. Ambient air is entering the inlet diffuser at T a =223 K. The maximum allowable turbine inlet temperature is set to T t4 ≤ 1116.5 K. According to previous wave rotor investigations 18,23,28 the wave rotor compression and expansion efficiencies are assumed with η WC =η WE = 0.83. A wave rotor compression ratio of PR W =p t2 /p t1 =1.8 appears to be conceivable for the envisioned application and is chosen for the discussion of representative values.…”

Section: Case Bmentioning

confidence: 99%

Performance Investigation of Small Gas Turbine Engines Topped with Wave Rotors

Akbari

Müller

2003

39th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit

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A performance analysis is performed for a small turbojet engine topped with various wave rotor cycles. Five different advantageous implementation cases for a four-port wave rotor into the given baseline engine are studied. The compressor and turbine pressure ratios, and the turbine inlet temperatures vary in the thermodynamic calculations according to the anticipated design objectives of the five considered cases. Advantages and disadvantages are outlined. Comparison between the theoretic performance results of wave-rotor-topped engines and the baseline engine shows a significant performance enhancement for almost all the cases studied. The highest gain is obtained for the case in which the topped engine operates with the same turbine pressure ratio, inlet temperature and the same physical compressor like that of the baseline engine. A general design map is generated showing the design space and optima for the baseline and topped engines. INTRODUCTIONGas turbines are typical power sources used in a wide size range for propulsion and power generation systems. Recently, there has been considerable interest in the research, development, and application of small gas turbines yielding high power density and enabling low-cost air vehicles. However, resulting from the smaller size, their efficiency and pressure ratio, hence specific work, are mostly lower than those of the large scale systems. Therefore, innovations are required to attractively enhance their performance.

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“…It is used to split the inlet flow in two flows; one at a higher pressure and the other at a lower one. Fatsis [4], examined the benefits of wave rotors as topping devices when applied to different types of gas turbines for aeronautical applications.…”

Section: Introductionmentioning

confidence: 99%

A computational method for pressure wave machinery to internal combustion engines and gas turbines

Fatsis¹,

Vrachopoulos²,

Mavrommatis³

et al. 2006

WIT Transactions on Engineering Sciences, Vol 52

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Pressure wave machinery constitutes promising devices in various engineering propulsion applications such as superchargers in automobile engines and topping devices in gas turbines. This article presents applications of a numerical model for the flow field prediction inside wave rotors. The numerical method used consists of an approximate Roe solver that takes into account viscous and thermal losses inside the rotor as well as leakage losses at the extremities of the rotor. The model is extensively validated and then is applied on configurations suited for automobile engine supercharging and for topping devices for gas turbines. For both cases, satisfactory results are obtained by the comparison of the numerical predictions against experimental data available in the literature. It is concluded that the present method can accurately predict the basic unsteady flow patterns inside the rotor.

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Thermodynamic analysis of gas turbines topped with wave rotors

Cited by 42 publications

References 1 publication

Review of Recent Developments in Wave Rotor Combustion Technology

Review of Recent Developments in Wave Rotor Combustion Technology

Performance Investigation of Small Gas Turbine Engines Topped with Wave Rotors

A computational method for pressure wave machinery to internal combustion engines and gas turbines

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