Preliminary analysis of the flow inside a three-port wave rotor by means of a numerical model

Fatsis, A.; Lafond, A; Ribaud, Yves

doi:10.1016/s1270-9638(98)80006-0

Cited by 19 publications

(15 citation statements)

References 3 publications

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“…As a first approximation, this approach can be considered realistic. Nevertheless pressure losses; viscous phenomena and leakage existing in the flow inside a real wave rotor are taken into account in the present method, Fatsis et al [5].…”

Section: Assumptionsmentioning

confidence: 99%

“…The second order accurate scheme of Roe [9] was chosen for the space discretisation of the system of the partial differential equations, Fatsis et al [5].…”

Section: Spatial Discretisationmentioning

confidence: 99%

“…For this reason, the four-step Runge-Kutta scheme consists of an attractive choice, Fatsis et al [5]. Studies show that the above scheme is second order accurate for non-linear equations, Hirsch [8].…”

Section: Time Integrationmentioning

confidence: 99%

“…One-dimensional methods based on the Euler equations are mainly used including modelling for losses that occur inside the rotor e.g. Fatsis et al [5], Paxson [6]. Two-dimensional methods such as the one of Welch [7] are rather time-consuming and are mainly suited to study in detail specific regions of interest of the flow field inside the rotor, such as finite opening / closing effects and shock wave -boundary layer interaction.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Assumptionsmentioning

confidence: 99%

“…The second order accurate scheme of Roe [9] was chosen for the space discretisation of the system of the partial differential equations, Fatsis et al [5].…”

Section: Spatial Discretisationmentioning

confidence: 99%

Section: Time Integrationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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“…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%

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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