Dynamic Features of Internal and External Flowfields of Pulsejet Engines

Anand, Vijay; Jodele, Justas; Prisell, Erik; Lyrsell, Owe; Gutmark, Ephraim

doi:10.2514/1.j059685

Cited by 9 publications

(5 citation statements)

References 21 publications

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“…At the same time, it is allowed to attach to the "liquid" piston the mass from flowing into the pipe during the reverse flow of air with increased density (reduced temperature), as well as its subsequent expulsion from the pipe. These assumptions were adopted based on the results of a study of resonance tubes of certain types of engines with a periodic workflow [15,27].…”

Section: The Study Materials and Methodsmentioning

confidence: 99%

“…Then the movement of gas through the pipe can be considered as the movement of a column of gas of some mass (Fig. 1), which has the properties of inertia [27]. This means that under the influence of a time-varying pressure difference, the speed velocity of gas movement lags behind the pressure -approximately the same as when waves move in a pipe.…”

Section: Construction Of a Piston Analogy Model For Air Flow In A Pipementioning

confidence: 99%

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Determination of gas parameters in resonant pipes and channels of engines with a periodic workflow using the piston analogy method

Khrulev

2023

EEJET

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This paper investigates a process of gas flow in the resonant tube of an engine with a periodic workflow. Analysis of various flow models and comparison of known data have shown that the problems of constructing closed 0-dimensional models of the operating cycle for some types of engines remain unresolved. Given this, the question arises about the dimensionality of models of individual engine elements, including the resonant pipe model, which must be included in the general model of the cycle, especially at the initial stage of its development. To solve the identified problems, a mathematical model of air flow has been improved, built on the basis of an analogy with a '"liquid" piston. Unlike existing ones, the piston analogy model allows one to calculate the instantaneous velocity averaged over the length of the pipe using a numerical solution of the differential equation for velocity. To test the model built, an alternative finite-difference 1-dimensional gas-dynamic model was selected, with the help of which a test simulation of air flow in a pipe was performed. It has been established that the piston model allows one to find the flow velocity with an accuracy of 5 % for a pressure drop varying according to a sinusoidal law. The permissible limits for changes in the oscillation frequency and pipe length were found, at which the piston model has a minimum error. Based on the results of the study, it was concluded that with a small mass and inertia of the liquid piston, the proposed model gives results close to those provided by more complex models with higher dimensionality. This indicates the possibility of using a piston model for elements such as pipes as part of a 0-dimensional thermodynamic model of engines with a periodic operating process as an approximate alternative to traditional 1-dimensional flow models

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Section: The Study Materials and Methodsmentioning

confidence: 99%

Section: Construction Of a Piston Analogy Model For Air Flow In A Pipementioning

confidence: 99%

Determination of gas parameters in resonant pipes and channels of engines with a periodic workflow using the piston analogy method

Khrulev

2023

EEJET

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“…The reason for this state of affairs could be both the level of complexity of the studied phenomenon, as well as the insufficient technological level of the then measuring equipment. In recent years, the dynamic development of measurement and imaging technologies has made it possible to carry out experiments that were previously difficult to perform [28][29][30][31][32]. Due to the great difficulty and complexity of the experimental studies of pulsating combustion chambers, numerical studies may be of invaluable help.…”

Section: Introductionmentioning

confidence: 99%

“…According to the authors of this article, it is particularly important to know the organization of the combustion process inside the chamber, as is the case with piston or turbine engines. In the cited literature review, it was approximated for one valve pulsating combustion chamber [28][29][30]. However, in these works, the authors do not control the operation of the tested engine in any way.…”

Section: Introductionmentioning

confidence: 99%

New Aspects of the Pulse Combustion Process

Gieras,

Trzeciak

2024

Energies

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Pulse combustion is an attractive yet still little-known form of combustion that can be successfully used in many industrial applications. Experimental studies show that the course of the combustion process in the valveless pulse combustion chamber is conditioned by the process of creating a well-mixed fuel–air mixture inside the chamber. In the paper, numerical calculations were carried out for selected operating conditions of the pulse chamber and compared with experimental results. This allowed for a better understanding and interpretation of the course of the pulsating combustion process itself. The role and importance of the rate of changes in the volume of the combustible mixture zone in the process of improving the efficiency of the combustion process were determined, and the reasons for changes in the pulsation frequency of the combustion process were also explained.

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“…Over the past decades, numerous research efforts have been devoted to the investigation of resonant pulse combustors (RPC), including the groups of Roberts [1,2], Paxson [3,4], Gutmark [5][6][7], and Miller [8,9]. The primary objective of these efforts has been to enable a significant increase in gas turbine efficiency by replacing the constant pressure steady combustor found in conventional engines with a pulse resonant combustor.…”

Section: Introductionmentioning

confidence: 99%