Unsteady Flow at the Junction of a Branched Duct

Deckker, B. E. L.; Male, D. H.

doi:10.1115/1.3425462

Cited by 2 publications

(4 citation statements)

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“…The coefficients are taken to be constant for each value of a (see figure). Figure 6 shows the transmitted pressure ratio as a function of the incident pressure ratio in a T-junction with a section ratio equal to f. In these tests, a comparison of the calculations with experimental results (8,9) shows very good agreement. Meanwhile, the calculations are stopped for pi/po equal to 1.9 because, above this threshold, the flow becomes sonic.…”

Section: Numerical Testsmentioning

confidence: 78%

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Calculation of Pressure Wave Propagation Through a Tube Junction

William-Louis¹,

Tournier²

1996

Proceedings of the Institution of Mechanical Engineers, Part C:

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This paper describes a new method for the calculation of pressure wave propagation through a junction. The unsteady model, valid for subsonicflow, takes into account thefluid compressibility and pressure losses according to the type of junction. A new method called the 'branch superposition method' is used for the numerical calculation, and consists of uncoupling the system of governing equations. During the propagation of pressure waves through a three-tube junction, two branches are inlet or outlet. Therefore, to uncouple the system, one of the two branches with incomingflow is modelled as a source or one of the two branches with outgoingjlow as a sink. This method, combined with the method of characteristics, gives the possibility of predicting the propagation of pressure waves through a junction, where thefluid may be initially at rest or not. The model is validated by a comparison with experimental results.

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Section: Numerical Testsmentioning

confidence: 78%

“…The mathematical nature of the previous systems does not change when the variable pressure loss coefficients are taken to be constant. In the following sections, the coefficients are 51, 9 …”

Section: A Pressure Loss Coefficientsmentioning

confidence: 99%

Calculation of Pressure Wave Propagation Through a Tube Junction

William-Louis¹,

Tournier²

1996

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…A series of experiments conducted by Deckker with others (13,14,15) on three-pipe junctions with three different configurations has provided a useful insight into pressure wave behaviour within the junction itself but a completely theoretical analysis of the events occurring was found to be impossible. A set of diagrams was therefore produced, based on the experimental results obtained and arranged to be suitable for use in calculations employing the method of characteristics.…”

Section: The M S Was Received On 28 December 1983 and Was Acceptedformentioning

confidence: 99%

“…The velocity directions must be checked in each pipe to establish the flow type and the appropriate pair of equations is then selected from equations (1-12) above. These two equations together with the continuity equation: P l F l U l + P 2 F 2 U 2 + P 3 F 3 U 3 = 0 (13) are expressed in terms of non-dimensional parameters and solved iteratively for the three reflected Riemann variables.…”

Section: Momentum Modelmentioning

confidence: 99%

An Improved Branched Pipe Model for Multi-Cylinder Automotive Engine Calculations

Bingham¹,

Blair

1985

Proceedings of the Institution of Mechanical Engineers, Part D:

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This paper describes a new mathematical model for calculating the behaviour of unsteady gas Pow in engine manifold junctions of any configuration. The model, which allows for pressure losses at the junction, is arranged for use with engine simulation computer programs in which the gas dynamics analysis is based on the method of characteristics. Experimental coefjicients obtained from steady Pow tests are presented for use with existing momentum theory models and also with the generalized approach. Measured pressure-time histories and performance data for a multi-cylinder engine are compared with computer predictions using three different pipe branch calculations: constant pressure theory, momentum theory and the generalized procedure. This comparison shows the new technique gives correlations which are better than the constant pressure method but without the limitations and complexity of the model based on momentum theory. 8/85 Q IMechE 1985

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Unsteady Flow at the Junction of a Branched Duct

Cited by 2 publications

References 0 publications

Calculation of Pressure Wave Propagation Through a Tube Junction

Calculation of Pressure Wave Propagation Through a Tube Junction

An Improved Branched Pipe Model for Multi-Cylinder Automotive Engine Calculations

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