Some Aspects of Constant Pressure Turbocharged Marine Diesel Engines of Medium and Low Speed

Azuma, Takayuki; Yura, Tadayoshi; Tokunaga, Yoshiro

doi:10.1115/1.3227471

Cited by 6 publications

(4 citation statements)

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“…The solution of this problem requires the length of the element to be discretized into nodes of calculation where the conservation equations are solved. The flow properties at the internal nodes of the 1D-element are obtained applying a shock capturing numerical methods as proposed by Takizawa [7], Azuma [8] and Poloni [9].…”

Section: Equations and Mesh Methodologymentioning

confidence: 99%

Assessment of a methodology to mesh the spatial domain in the proximity of the boundary conditions for one-dimensional gas dynamic calculation

Serrano

Arnau

Reyes-Belmonte

2011

Mathematical and Computer Modelling

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net/10251/95442 Elsevier J.R. Serrano; Arnau Martínez, FJ.; Piqueras, P.; Reyes Belmonte, MA. (2011). Assessment of a methodology to mesh the spatial domain in the proximity of the boundary conditions for one-dimensional gas dynamic calculation. Mathematical and Computer Modelling. 54:1747-1752. AbstractSolution of governing equations for one-dimensional compressible unsteady flow has been performed traditionally using a homogenously distributed spatial mesh. In the resulting node structure, the internal nodes are solved by applying a shock capturing finite difference numerical method whereas the solution of the end nodes, which define the boundary conditions of the pipe, is undertaken by means of the Method of Characteristics. Besides the independent solution of every method, the coupling between the information obtained by the method of characteristics and the finite differences method is key in order to reach a good accuracy in gas dynamics modeling. The classical spatial mesh could provide numerical problems leading the boundary to generate mass, momentum and energy lack of conservation because of the interpolation methodology usually applied to draw the characteristics and path lines from its departure point at calculation time to the end of the pipe during the next time-step. To deal with these undesirable behavior, at this work a modification of the traditional grid including an extra node close to the boundary is proposed in order to explore its ability to provide numerical results with higher conservation fulfillment.

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Section: Equations and Mesh Methodologymentioning

confidence: 99%

Assessment of a methodology to mesh the spatial domain in the proximity of the boundary conditions for one-dimensional gas dynamic calculation

Serrano

Arnau

Reyes-Belmonte

2011

Mathematical and Computer Modelling

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“…Simulation programs are now widely used for reciprocating engines both for performance prediction [1][2][3][4][5][6][7][8][9][10][11][12][13][14] and for diagnosis purposes [15]. Different authors [1][2][3][4][5][6][7][8][9][10][11] have developed programs for spark ignition and diesel engines.…”

Section: Introductionmentioning

confidence: 99%

“…Different authors [1][2][3][4][5][6][7][8][9][10][11] have developed programs for spark ignition and diesel engines. Zero-dimension models using a &dquo;filling and emptying&dquo; method (i.e., the engine is considered as a succession of control volumes where the laws of thermodynamics are applied to a homogeneous fluid) give satisfactory results compared with measurements made on a testbed.…”

Section: Introductionmentioning

confidence: 99%

An Implementation of the Method of Characteristics Using ACSL Software

Hétet

Mezencev

1997

SIMULATION

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The simulation of gas flows in a reciprocating engine requires solution of the equations of gas dynamics because of the pressure waves in the manifolds, for example. The method of characteristics provides a means for solving hyperbolic partial differential equations. We propose in this paper a new way to implement this using ACSL software. After presenting an outline of the method of characteristics and ACSL software, we present a program to solve a simple case: a pressurized pipe with a gradually opening valve. The state event mechanism allows the boundary conditions and the intersections of the characteristics emitted from both ends of the pipe to be dealt with precisely while the solution of the differential equations is realized in a continuous fashion.

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“…This method will be referred to as the hybrid method of Benson. It has been determined, even at the early period of the development of the hybrid method of Benson, that problems arise for calculations in ducts with area changes (3, 4). In reference (5) it is noticed that conservation errors occur: the cycle integrated mass flow is not constant in all mesh points of the duct. This results in an error of the mass balance of the engine: e.g.…”

mentioning

confidence: 99%

Calculation of the Unsteady Flow in Exhaust Pipe Systems: New Algorithm to Fulfil the Conservation Law in Pipes with Gradual Area Changes

Hove

Sierens

1991

Proceedings of the Institution of Mechanical Engineers, Part C:

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In this paper a new calculation method is proposed for the gasflow in tapered pipes. The model is adapted to the hybrid method of characteristics. The key idea of the model is to concentrate any area change over one mesh length in the mesh points instead of using an area gradient along the characteristic lines. The model has the disadvantage that the computing time increases, but it has the great advantage that the law of conservation of mass is fulfilled for the whole pipe length, even for important area changes. This allows the other advantages of the method of characteristics to be retained, for example the treatment of discontinuities in temperature or gas composition, without compromising the mass balance of the engine. In a test case it is shown that the new model correctly predicts the massflowrate at all mesh points, which is not the case for the original hybrid method or other adapted versions. Tests for a real engine situation give results for the conservation of mass that are comparable with the best results of the Lax-Wendroff method. a a, C06290 0 IMechE 1991 0954-4062/91 $2.00 + .05

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Some Aspects of Constant Pressure Turbocharged Marine Diesel Engines of Medium and Low Speed

Cited by 6 publications

References 0 publications

Assessment of a methodology to mesh the spatial domain in the proximity of the boundary conditions for one-dimensional gas dynamic calculation

Assessment of a methodology to mesh the spatial domain in the proximity of the boundary conditions for one-dimensional gas dynamic calculation

An Implementation of the Method of Characteristics Using ACSL Software

Calculation of the Unsteady Flow in Exhaust Pipe Systems: New Algorithm to Fulfil the Conservation Law in Pipes with Gradual Area Changes

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