A generalized fluid system simulation program to model flow distribution in fluid networks

Majumdar, Alok; Bailey, John W.; Schallhorn, Paul; Steadman, Todd

doi:10.2514/6.1998-3682

Cited by 10 publications

(4 citation statements)

References 2 publications

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“…For rotordynamics applications, the pressure distribution of the uid circuit model is integrated to obtain the radial and tangential forces of Eqs. (10) and (11):…”

Section: Steady-state Long-bearing Sfd Modelingmentioning

confidence: 99%

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Fluid Circuit Model for Long-Bearing Squeeze Film Damper Rotordynamics

Schallhorn¹,

Elrod²,

Goggin³

et al. 2000

Journal of Propulsion and Power

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Results of a rotordynamic analysis of a long-bearing squeeze lm damper using a uid circuit approach are presented. A series of nodes and branches represent the geometry of the ow circuit. The mass and momentum conservation equations are solved to predict the pressure distribution in the squeeze lm. The motion of the bearing is simulated by injection/removal of mass at the nodes. The modeling methodology is benchmarked against published experimental long-bearing squeeze lm damper test results. The model provides good agreement with the experimental damping coef cient. Nomenclature C= squeeze lm damper radial clearance (difference in radii) C p = pressure conversion factor, l x R 2 / C 2 C tt = dimensionless direct damping coef cient, ¡ f t / e D rr = dimensionless direct inertia coef cient, f r / e d = damper journal diameter e = dynamic eccentricity (orbit radius) L = damper journal length Çm = mass-ow rate p = local pressure within the squeeze lm region p ref = reference pressure, C p Re = q ( Rx ) 2 R = damper journal radius Re = Reynolds number, q x C 2 / l r = radial coordinate z = axial coordinate e = eccentricity ratio (dimensionless orbit radius), e/ C h = circumferential coordinate l = uid absolute viscosity q = uid density s f = shear stress x = frequency of damper journal (whirl frequency)

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“…For rotordynamics applications, the pressure distribution of the uid circuit model is integrated to obtain the radial and tangential forces of Eqs. (10) and (11):…”

Section: Steady-state Long-bearing Sfd Modelingmentioning

confidence: 99%

“…10 The code uses a series of nodes and branches to de ne a ow network. Nodes are positions within the network where uid properties (pressure, density, etc.)…”

Section: Fluid Flow Codementioning

confidence: 99%

Fluid Circuit Model for Long-Bearing Squeeze Film Damper Rotordynamics

Schallhorn¹,

Elrod²,

Goggin³

et al. 2000

Journal of Propulsion and Power

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“…Therefore, a water distribution network without heat transfer was selected to verify the new function. The calculation results were compared with the Generalized Fluid System Simulation Program (GFSSP), 34 a flow network analysis program developed by NASA that has been validated by means of experimental data.…”

Section: Topology Analysis Of Thermo-fluid Networkmentioning

confidence: 99%

“…This may be because the flow properties applied in the two programs are not the same, as these are not provided in the literature. 34 In general, this program can provide mass flow and pressure calculation results with sufficient accuracy, which means that the new cooling model function is workable.…”

Section: Topology Analysis Of Thermo-fluid Networkmentioning

confidence: 99%

Aero-thermal coupled through-flow method for cooled turbines with new cooling model

Ren

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part A:

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The aero-thermal-coupled phenomenon is significant in modern cooled turbines, and an aero-thermal coupled throughflow method has previously been developed by the authors for considering the influence of heat transfer and coolant mixing in through-flow design. However, the original cooling model is not capable of calculating the distribution of the coolant mass flow rate and pressure loss in complex cooling structures. Therefore, in this paper, a one-dimensional flow calculation for the internal coolant is introduced into the heat transfer calculation to further improve the through-flow cooling model. Based on various empirical correlations, the cooling model can be used to simulate different cooling structures, such as ribbed channels and cooling holes. Three operating conditions were selected for verification of the NASA-C3X vane, which has 10 internal radial cooling channels. The calculated Nusselt number of internal cooling channels strongly agrees with the experimental data, and the predicted blade surface pressure and temperature distributions at mid span are also in good agreement with the experimental data. The convergence history of the meridional velocity and blade surface temperature demonstrates effective convergence properties. Therefore, the aero-thermalcoupled through-flow method with the new cooling model can provide a reliable tool for cooled turbine through-flow design and analysis.

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Numerical Prediction of Flow and Heat Transfer on lubricant Supplying and Scavenging Flow Path of an Aero-Engine Lubrication System

Huang

Liu

et al. 2007

New Trends in Fluid Mechanics Research

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This paper presents a numerical model of internal flows on lubricant supplying and scavenging flow path of an aero-engine lubrication system. The numerical model was built in the General Analysis Software of Aero-engine Lubrication System (GASLS), developed by Northwestern Polytechnical University. The lubricant flow flux, pressure and temperature distribution at steady state were calculated. GASLS is a general purpose computer program employed a 1D steady state network algorithm for analyzing flowrates, pressures and temperatures in a complex flow network. All kinds of aero-engine lubrication systems can be divided into finite correlative typical elements and nodes from which th,~ calculation network is developed in GASLS. Special emphasis is put on how to use combinational elements which is a type of typical elements to replace some complex components such as bearing compartments, accessory drive gearboxes or heat exchangers. This method can reduce network complexity and improve calculation efficiency. The computational results show good agreement with experimental data.

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A generalized fluid system simulation program to model flow distribution in fluid networks

Cited by 10 publications

References 2 publications

Fluid Circuit Model for Long-Bearing Squeeze Film Damper Rotordynamics

Fluid Circuit Model for Long-Bearing Squeeze Film Damper Rotordynamics

Aero-thermal coupled through-flow method for cooled turbines with new cooling model

Numerical Prediction of Flow and Heat Transfer on lubricant Supplying and Scavenging Flow Path of an Aero-Engine Lubrication System

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