Modeling and simulation of a class of liquid propellant engine pressurization systems

Karimi, Hossein; Nassirharand, Amir; Mohseni, Mahdi

doi:10.1016/j.actaastro.2009.07.018

Cited by 25 publications

(10 citation statements)

References 15 publications

(14 reference statements)

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“…The gas-liquid two-phase flow exists in many industrial applications, including liquid fuel rocket propellant tanks [1,2]. In these tanks, the two gas and liquid phases are next to each other until the end of the engine operation [2,3].…”

Section: Introductionmentioning

confidence: 99%

“…In these tanks, the two gas and liquid phases are next to each other until the end of the engine operation [2,3]. In fact, a gas pressure feeding system is required to pressurize the fuel and oxidizer in propellant tanks to transfer them with the required flow and pressure to the combustion chamber [1,2]. The outflow of liquid propellant from the tanks is associated with forming vortices [4].…”

Section: Introductionmentioning

confidence: 99%

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Numerical analysis of transient vortex formation at the outlet of a tank containing gas-liquid phases

Mohseni

Domfeh

2023

Preprint

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One of the basic phenomena when a liquid leaves a tank, is the formation of vortices. This phenomenon can significantly affect the remaining liquid mass in the tank and the penetration of air and bubbles into the system. As a result, system performance may be disrupted. This study numerically investigates the influence of parameters such as discharge time, gas pressure, liquid depth, and angular velocity of the reference frame on the vortex characteristics. In addition, the near-wall behavior of the analytical relations proposed for the tangential velocity has been revised based on the boundary layer theory. The "volume of fluid" model (VOF) and the SST k-ω turbulence model have been used to solve the two-phase turbulent flow. The results show that increasing the gas pressure from 1 to 5 bar and its direct impact on the liquid surface significantly accelerates the formation of the vortex and the critical height. This phenomenon causes, after the starting of liquid discharge, the air core to reach the inlet port of the outlet pipe about 7 seconds earlier. As a result, much more liquid mass remains in the tank. Also, the increase in the angular velocity of the reference frame from 0.1 to 1 rad/s causes the critical height to be formed much sooner and the remaining liquid mass to increase by 32 kg. Furthermore, the amount and the variations of turbulent viscosity significantly differ from the semi-empirical constant values, limiting their use to particular streams.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical analysis of transient vortex formation at the outlet of a tank containing gas-liquid phases

Mohseni

Domfeh

2023

Preprint

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“…By using Fluent 15.0 to conduct steady-state computation for the triple eccentric butterfly valve, Sun et al [18] discovered that the surface roughness may result in a big difference between the flow coefficient obtained by simulation without friction and the actual flow coefficient. The second type of research [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42] focuses on the whole system rather than the valve, and thus generally uses the traditional 0D throttling flow-rate equation instead of the momentum equation to describe the dynamic throttling effect of the valve spool. In order to accurately describe the throttling effect, this simplified modeling method must take flow-rate equation, flow coefficient calculation, and valve-spool opening and closing rule into full consideration.…”

Section: Introductionmentioning

confidence: 99%

“…Liang et al [42] investigated the temperature control of a vehicle climate chamber, and the flow coefficient of adjusting valves in the chilled water system also adopted the second type of method. As for the third type of method, Karimi et al [26] used a nozzle model with variable area for the modeling of the pressure reducer valve when simulating the liquid propellant engine pressurization systems, where the flow area is function of the opening and the flow coefficient is constant; the same treating method also occurred in the modeling of the first and second throttling orifices of a class of three-way pressure reducing valve by Gad [27]. The fourth type of method usually applies to the full open valve or the constant-flow-area orifice.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Modeling and Full-Process Simulation of the Core Engine Test Rig Main Test System

et al. 2021

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As a virtual digital model that can reflect physical entities or systems, digital twins are revolutionizing industry. The first prerequisite for the construction of digital twins is the establishment of high-precision and complex entities or system models. A 47-components numerical system is established for the core engine test rig main test system by using the finite volume modularization modeling method. A comprehensive solution to the system-level valve-spool/orifice throttling modeling, the key issue of the fluid pipeline system modeling, is presented, and the algorithms of throttling and mixing are deepened and expanded. The full-process simulation study on two tests of normal-temperature 1400 s and low-temperature 1240 s shows that the combined regulation of five regulator valves and the change of cold source directly decide dynamic change of the system in each stage; the simulation reveals the phenomena such as the gas cylinder cooling with deflation, the air cooling when expanding from main pipeline to two branch pipelines, shunting flow by branch pipeline, and the cold and hot gases mixing; the overall variation trends of the simulation curves are consistent with those of all the experimental curves of the test rig normal-temperature/low-temperature air supply lines, exhaust bypass, and engine main line in two operating conditions, and the maximum error between simulation curves and test curves of pressure, total pressure, and total temperature is less than 12%. The numerical system can be used for the construction of virtual models of digital twins, and the modeling method provides a feasible solution to the key technology of digital twins.

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“…Besides, several numerical models have been developed to predict the pressurization performances. Majumdar [28] , Hearn [29] , and Karimi et al [30] applied a thermodynamic equilibrium model to investigate the pressurization behaviors of a discharge process. Roudebush [31] and Masters [32] developed a onedimensional model to take into consideration the formation of thermal stratification in the ullage during discharge.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of pressurization performance in cryogenic tank of new‐style launch vehicle

Wang

Zhao

et al. 2013

Asia-Pacific J Chem Eng

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The pressurization performance of cryogenic tanks during discharge is investigated by a computational fluid dynamic approach. A series of cases accounting for the effects of various influence factors such as inlet gas temperature, ramp time of inlet gas temperature, wall thickness, outflow rate, injector structure, and liquid supercooling on pressurization behaviors are computed and analyzed successively. Several valuable conclusions have been drawn as follows: (1) Increasing inlet gas temperature, applying a thin wall to construct the tank, and increasing the outflow rate are beneficial to the reduction of gas requirements, (2) Ramp process and use of a straight pipe injector may lead to an excessive pressure drop at the beginning of discharge, (3) Use of straight pipe injector can remarkably reduce the gas requirement but lead to a large loss of liquid propellant as well as a large weight of final ullage gas, and (4) The mode of mass transfer within the tank is close related to the injector structure and liquid supercooling. A trend of mass transfer toward evaporation can be observed by increasing the liquid temperature, especially for the straight pipe injector case. Generally, the results of this paper might be beneficial to the design and optimization of a pressurization system. © 2013 Curtin University of Technology and John Wiley & Sons, Ltd.

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Modeling and simulation of a class of liquid propellant engine pressurization systems

Cited by 25 publications

References 15 publications

Numerical analysis of transient vortex formation at the outlet of a tank containing gas-liquid phases

Numerical analysis of transient vortex formation at the outlet of a tank containing gas-liquid phases

Dynamic Modeling and Full-Process Simulation of the Core Engine Test Rig Main Test System

Numerical investigation of pressurization performance in cryogenic tank of new‐style launch vehicle

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