Numerical Modeling of Fluid Transients by a Finite Volume Procedure for Rocket Propulsion Systems

Majumdar, Alok; Flachbart, R. H.

doi:10.1115/fedsm2003-45275

Cited by 8 publications

(5 citation statements)

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“…The physical model is schematically shown in Figure 3. The objective of this problem (Majumdar and Flachbart, 2003) is to be able to predict the liquid's response to the sudden valve closure, including the maximum expected pressure and the frequency of oscillation. The lox flows at 500 psia at a temperature of −260 °F through a 400‐ft‐long, 0.25‐in‐diameter pipeline at a mass flow rate of 0.0963 lbm/s.…”

Section: Test Problems and Cpu Resultsmentioning

confidence: 99%

Fast, nonlinear network flow solvers for fluid and thermal transient analysis

Majumdar

Ravindran

2010

Int Jnl of Num Meth for HFF

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Purpose -The purpose of this paper is to present a fast nonlinear solver for the prediction of transients in network flows. Design/methodology/approach -Broyden method-based nonlinear solvers are developed to solve the system of conservation equation for fluids by judiciously exploiting physical coupling among the equations. Findings -To demonstrate the feasibility and robustness of the solvers, two test cases of practical engineering interest were solved. The results obtained by the solvers were verified against analytical results for a simplified case. The performance of the solvers was found to be comparable or better than existing solvers. Originality/value -The proposed solver enables predictions of fluid and thermal transients in complex flow networks feasible in reduced computational time.

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Section: Test Problems and Cpu Resultsmentioning

confidence: 99%

Fast, nonlinear network flow solvers for fluid and thermal transient analysis

Majumdar

Ravindran

2010

Int Jnl of Num Meth for HFF

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“…There have been a review of water hammer theory and practice done by Ghidaoui et al in 2005 [1]. However, there have been numerous works in this area since then, in particularly for aerospace applications [2,3,4,5]. However, except for a few, not much study have been done in the area of priming, in particularly for priming in a flow network containing numerous flow components.…”

Section: Introductionmentioning

confidence: 99%

Fluid Transient Analysis during Priming of Evacuated Line

Bandyopadhyay

Majumdar

Holt

2017

53rd AIAA/SAE/ASEE Joint Propulsion Conference

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Water hammer analysis in pipe lines, in particularly during priming into evacuated lines is important for the design of spacecraft and other in-space application. In the current study, a finite volume network flow analysis code is used for modeling three different geometrical configurations: the first two being straight pipe, one with atmospheric air and other with evacuated line, and the third case is a representation of a complex flow network system. The numerical results show very good agreement qualitatively and quantitatively with measured data available in the literature. The peak pressure and impact time in case of straight pipe priming in evacuated line shows excellent agreement.

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“…GFSSP has been used to predict the chilldown of a cryogenic transfer line, based on transient heat transfer effects and neglecting fluid transient effects. [3] Recently, GFSSP's capability has been extended to include fluid transient effects. [4] N T Van Dresar [5] et al investigated transient behaviour of a small scale cryogenic transfer line.…”

Section: A Chilldown and Two Phase Flowmentioning

confidence: 99%

Comparison of Chilldown of Liquid Nitrogen Transfer Lines of Different Materials by Using Computational Fluid Dynamics

R¹

2018

IJRASET

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Even though the process of cryogenic chilldown is very complex, attempts are continuously being made to simulate the momentum and energy interactions accurately as in real case through CFD. One of the major reasons is the lack of reliable data and correlations that compass the parameters associated with cryogenic fluids. This work has taken the much needed first step in studying the effect of varying transfer line materials on their corresponding chilldown times. Chilldown in aluminium copper steel lines were investigated using validated computational fluid dynamics code (FLUENT 15.0). The time taken to completely chilldown o aluminiumis the fastest and requires minimum fluid mass compared to copper and steel . it is predicted through this computational technique that aluminium is the best material or chilldown as opposed to copper and steel Keywords: Cryogenics, Chill down, Two phase flow, Heat transfer rate I. INTRODUCTIONCryogenic fluids have been used in various applications over the past century. One application that is continuously getting attention has been the use of cryogenic propellants for rocket propulsion. This interest is sparked by the fact that cryogenic propellants yield more energy and are more environmentally friendly, when compared to non-cryogenic propellants and the storage systems for these cryogenic propellants are lighter than those required for their non-cryogenic counterparts. The operation of a cryogenic propulsion system requires cooling of transfer line before establishing a steady flow of cryogenic fluid between various system components. The process of cooling down the equipment with cryogenic fluid is known as a cryogenic chilldown process. Cryogenic transfer line chill down is a transient heat transfer problem that involves rapid heat exchange from a solid structure to a fluid with phase change. It is necessary to know how long it takes to chill down a given transfer line for satisfactory operation. When liquid cryogen, for example nitrogen, at saturation temperature (77.6 K at 1 atm.) begins flowing through a tube initially at ambient temperature (300 K) the liquid instantly vaporizes near the tube wall. Thus a cross-section of the flow will have an outer vapour ring with a saturated liquid core. As the flow moves downstream, the liquid core evaporates and the vapour becomes superheated. As the tube wall cools, the liquid core penetrates further and further downstream. Eventually, the tube becomes filled with liquid. Reduction in fluid density by vaporization causes the average flow velocity to increase significantly. Prediction of chilldown time requires modelling of these transient phenomena and understanding of how they affect heat transfer from the tube wall to the flowing cryogen. Transient heat transfer processes between the liquid and transfer line cause vaporization of the liquid, and this phase change can cause transient pressure and flow surges in the liquid. As the transfer line is cooled, these effects diminish until the liquid reaches a steady flow condit...

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Numerical Modeling of Fluid Transients by a Finite Volume Procedure for Rocket Propulsion Systems

Cited by 8 publications

References 0 publications

Fast, nonlinear network flow solvers for fluid and thermal transient analysis

Fast, nonlinear network flow solvers for fluid and thermal transient analysis

Fluid Transient Analysis during Priming of Evacuated Line

Comparison of Chilldown of Liquid Nitrogen Transfer Lines of Different Materials by Using Computational Fluid Dynamics

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