Basic design scheme for wave rotors

Iancu, Florin; Piechna, Janusz; Müller, Norbert

doi:10.1007/s00193-008-0165-7

Cited by 32 publications

(10 citation statements)

References 21 publications

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“…This engine employs the Humphrey cycle, which employs isentropic compression followed by constant volume combustion and isentropic expansion of the combusted gases. Recent work on the design and optimization of radial wave engines has been carried out by Iancu et al (2008), Piechna (2006), Vagani (2009), Iancu (2005, Piechna (2004; see the references therein for older work). The basic design element consists of a circular metallic rotor with curved channels machined inside, which act as the combustion chamber as shown in Figure 1.…”

Section: Introduction Backgroundmentioning

confidence: 99%

Premixed Flame Propagation and Morphology in a Constant Volume Combustion Chamber

Hariharan

Wichman

2014

Combustion Science and Technology

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This work presents an experimental and numerical investigation of premixed flame propagation in a constant volume rectangular channel with an aspect ratio of six (6) that serves as a combustion chamber. Ignition is followed by an accelerating cusped finger-shaped flame-front. A deceleration of the flame is followed by the formation of a "tulip"-shaped flame-front. Eventually, the flame is extinguished when it collides with the cold wall on the opposite channel end. Numerical computations are performed to understand the influence of pressure waves, instabilities, and flow field effects causing changes to the flame structure and morphology. The transient 2D numerical simulation results are compared with transient 3D experimental results. Issues discussed are the appearance of oscillatory motions along the flame front and the influences of gravity on flame structure. An explanation is provided for the formation of the "tulip" shape of the premixed flame front.

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Section: Introduction Backgroundmentioning

confidence: 99%

Premixed Flame Propagation and Morphology in a Constant Volume Combustion Chamber

Hariharan

Wichman

2014

Combustion Science and Technology

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“…In practice, the PWS design is rather difficult, concerning the number of channels, the number of rows or, for instance, breaking the symmetry of the rotor cells for reducing the noise [4][5][6][7][8][9]. Also, the leakage is of great importance as it seriously affects the performanceit has to be minimized, yet preventing the occurrence of contact, regardless of the thermal regime.…”

Section: Fundamentals Of Pws General Operating Principles Design and Constructionmentioning

confidence: 99%

Numerical investigation of a pressure wave supercharger

Costiuc

2022

IOP Conf. Ser.: Mater. Sci. Eng.

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The paper aims at a numerical investigation of the evolution of velocity, pressure and temperature field along the wave rotor channels for a pressure wave supercharger. Since in literature most of the studies are made considering the working fluid as incompressible and inviscid in a 2D field, the present study is using the compressible and viscous terms in unsteady Navier-Stokes equations for fluid in 3D field. The geometry was drawn in CAD software using measurements made on a real model of the CX-93 pressure wave supercharger. The simulation was conducted using a CFD code for unsteady 3D k-e, k-co model approach to reproduce data such as pressures, temperature and mass flows which are usually measured in real engine pressure wave supercharging. The computational domain for uRANS was modeled as a moving rotational domain with adaptive meshing. Results such as velocity, pressure and temperature field in the rotor channels were obtained for exhaust gas inlet pressure of 0.28 MPa and 1465 K temperature at different rotational speeds. The air inlet state considered was: 0,098 MPa and 293 K. Supercharging by means of a pressure wave supercharger, in order to improve the performance of an internal combustion engine, appears to be a promising solution since the exhaust gas generates a benefice boost of intake air with significant advantages when compared to the conventional turbocharging. The numerical modelling of the complex phenomena occurring within the narrow channels might be a useful tool for improving the pressure exchange between the working fluids, either by modifying the input parameters or by optimizing the geometry of the rotor, ports or pockets.

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“…The practical motivation of our original research was to study premixed flame propagation inside a wave disk engine, which employs isentropic compression followed by CV combustion. A detailed explanation of the wave disk engine design and its thermodynamic cycle is provided in Iancu et al (2008), Piechna (2006), Vagani (2009), Iancu et al (2005), Piechna et al (2004), and Hariharan and Wichman (2014); see also the references therein for older work. An experimental investigation of Michigan State University's wave engine prototype revealed unambiguously that combustion was by far the lengthiest process in the cycle.…”

Section: Introductionmentioning

confidence: 99%

Structure and Propagation of Premixed Flames in a Closed Combustion Chamber with Multiple Ignition Sources

Hariharan

Wichman

2015

Combustion Science and Technology

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This work presents an experimental and numerical investigation of premixed flame propagation in a constant volume combustion chamber ignited by multiple sparks. The combustion chamber consists of an aluminum channel with an aspect ratio of six. Optical windows along the length of the channel enable visual imaging. Ignition is followed by an accelerating spherical flame front, which subsequently decelerates to form a "tulip"-shaped flame front. Eventually, this tulip flame is extinguished by collision with the opposing flame front ignited at the other end of the channel. Numerical simulations examine the influence of the flow field on the structure and morphology of the flame. The threedimensional numerical simulation is compared with experimental results. An investigation of flame oscillations for various time delays between the two sparks is performed. The flow field is analyzed by using the corresponding numerical simulation.

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Basic design scheme for wave rotors

Cited by 32 publications

References 21 publications

Premixed Flame Propagation and Morphology in a Constant Volume Combustion Chamber

Premixed Flame Propagation and Morphology in a Constant Volume Combustion Chamber

Numerical investigation of a pressure wave supercharger

Structure and Propagation of Premixed Flames in a Closed Combustion Chamber with Multiple Ignition Sources

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